CN102230133A - Cr-containing Alloy steel and manufacturing method thereof - Google Patents
Cr-containing Alloy steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to Cr-containing alloy steel and a manufacturing method thereof. The Cr-containing alloy steel contains 0.03-0.07 % of C, 1.50-4.99 % of Cr, 0.03-0.05 % of Nb, 0.15-0.25 % of Mo, 0.01-0.03 % of Ti and the balance of Fe and inevitable impurities in percentage by weight. The Cr-containing alloy steel provided by the invention has the advantages of good welding property and corrosion resistance, in particular good resistance to carbon dioxide local corrosion, and low production cost, and can be used for manufacturing oil gas transmission lines.
Description
Technical field
What the present invention relates to a kind of resistant to carbon dioxide local corrosion contains Cr steel alloy and manufacture method thereof, and what local corrosion does not particularly take place under oil-gas field carbonated environment and have a weldability contains the Cr steel alloy, and this steel alloy can be used for making the transportation pipe line.
Background technology
Association carbonic acid gas usually in oil reservoir and the gas reservoir, carbonic acid gas is water-soluble, forms carbonic acid, can cause heavy corrosion to the transportation pipe line.Moist carbonic acid gas can cause carbon steel pipe line generation local corrosion usually and bore a hole, if adopt stainless steel, though can solve etching problem, cost significantly improves, and there is the problem of weldability difference in stainless steel.Therefore, exploitation can the resistant to carbon dioxide local corrosion, to have the cheaper again new steel grade of weldability, cost concurrently very necessary.
Chinese invention patent application 01126575.2 (low alloy steel of carbon dioxide corrosion-resistant and tubing and casing) discloses a kind of steel alloy, and its chemical ingredients is: C:0.01-0.3%, Si:0.10-1.0%, Mn; 0.1-2.0%, Cr:0.5-5.0%, Mo:0.01-1.0%, Cu:0.05-2.0%, Ni:0.05-1.0%, Al:0.005-0.1%, all the other are Fe and unavoidable impurities.This patent is by adding the Cr element (0.5-5.0%) of a wider range, suppress the corrosion under the combination of acidic corrosion working conditions such as wetting carbonic acid gas, chlorion, hydrogen sulfide, this patent is used to make oil gas well tubing and casing, the finished product be organized as the sorbite tissue.
Chinese invention patent application 200910117129.x (a kind of Cr of containing thick-wall pipeline steel and coiled sheet controlled rolling and controlled cooling method thereof) discloses a kind of steel alloy, its chemical ingredients: Cr:0.20-0.90%, C:0.0,3-0.09%, Si:0.20-0.35%, Mn; 1.00-1.30%, Ti:0.010-0.030%, Nb:0.03-0.08%, Cu:0.15-0.30%, Ni:0.10-0.40%, this invention mainly improves intensity and crystal grain thinning by adding a small amount of Cr (0.20-0.90%), forms many and thin acicular ferrite structure.
When carrying high pressure, carbonated oil gas medium, local corrosion takes place and causes pipeline leakage in carbon steel pipe line easily, if but a large amount of alloying elements are gained in strength and anti-local corrosion performance by adding, the one, roll up cost, the 2nd, may cause the weldability variation.Therefore, research is a kind of necessitates at the anti-local corrosion steel alloy that has concurrently on the basis of good weldability by suitable component and explained hereafter.
Summary of the invention
The invention provides a kind of Cr of containing steel alloy and manufacture method thereof.
In first aspect, the invention provides a kind of Cr of containing steel alloy, it contains
C：0.03-0.07％，
Cr：1.50-4.99％，
Nb：0.03-0.05％，
Mo：0.15-0.25％，
Ti：0.01-0.03％，
All the other are Fe and unavoidable impurities, more than all be weight percentage.
In second aspect, the invention provides its Cr steel alloy that contains and make by first aspect present invention.
In the third aspect, the invention provides and make the method that contains the Cr steel alloy, comprise the steps:
(1) provide the steel billet that contains the Cr steel alloy, described steel billet contains
C：0.03-0.07％，
Cr：1.50-4.99％，
Nb：0.03-0.05％，
Mo：0.15-0.25％，
Ti：0.01-0.03％，
(2) forge described steel billet, wherein final forging temperature is not less than 1000 ℃;
(3) make the forged steel billet of process carry out following two stage rolling,
(a) fs is a rough rolling step, and wherein the start rolling temperature of rough rolling step is 1100-1150 ℃, is preferably 1100-1130 ℃; The finishing temperature of rough rolling step is 980-1000 ℃, is preferably 1000 ℃;
(b) subordinate phase is the finish rolling stage, and wherein the start rolling temperature in finish rolling stage is 900-950 ℃, is preferably 930-950 ℃; The finishing temperature in finish rolling stage is 850-900 ℃, is preferably 880-900 ℃;
The draft of wherein said rough rolling step is greater than 45%, and the total draft of the whole operation of rolling is not less than 65%;
(4) make through rolling steel cooling, obtain described steel alloy, wherein final cooling temperature is 500-600 ℃, is preferably 540-580 ℃, and speed of cooling is 10-35 ℃/s.
Particularly, the application comprises following embodiment:
Embodiment contains the Cr steel alloy for 1. 1 kinds, and it contains
C：0.03-0.07％，
Cr：1.50-4.99％，
Nb：0.03-0.05％，
Mo：0.15-0.25％，
Ti：0.01-0.03％，
All the other are Fe and unavoidable impurities, more than all be weight percentage.
Embodiment 1 contain the Cr steel alloy, wherein, contain
C：0.03-0.04％，
Cr：2.00-2.99％，
Nb：0.03-0.05％，
Mo：0.20-0.25％，
Ti:0.02-0.03%, more than all be weight percentage.
Embodiment 1 contain the Cr steel alloy, wherein, contain
C：0.03-0.35％，
Cr：3.01-4.99％，
Nb：0.03-0.05％，
Mo：0.20-0.25％，
Ti:0.02-0.03%, more than all be weight percentage.
Among the embodiment 1-3 each contain the Cr steel alloy, wherein, also contain the Si of 0.15-0.25wt%.
Among the embodiment 1-3 each contain the Cr steel alloy, wherein, also contain the Si of 0.15-0.20wt%.
Among the embodiment 1-5 each contain the Cr steel alloy, wherein, also contain the Mn of 0.40-0.60wt%.
Among the embodiment 1-5 each contain the Cr steel alloy, wherein, also contain the Mn of 0.40-0.50wt%.
Among the embodiment 1-7 each contain the Cr steel alloy, wherein said steel alloy has bainite structure.
9. transportation pipe line, it is made by each the Cr steel alloy that contains among the embodiment 1-8.
10. a manufacturing contains the method for Cr steel alloy, comprises the steps:
(1) provide the steel billet that contains the Cr steel alloy, described steel billet contains
C：0.03-0.07％，
Cr：1.50-4.99％，
Nb：0.03-0.05％，
Mo：0.15-0.25％，
Ti：0.01-0.03％，
(2) forge described steel billet, wherein final forging temperature is not less than 1000 ℃;
(3) make the forged steel billet of process carry out following two stage rolling,
(a) fs is a rough rolling step, and wherein the start rolling temperature of rough rolling step is 1100-1150 ℃, is preferably 1100-1130 ℃; The finishing temperature of rough rolling step is 980-1000 ℃, is preferably 1000 ℃;
(b) subordinate phase is the finish rolling stage, and wherein the start rolling temperature in finish rolling stage is 900-950 ℃, is preferably 930-950 ℃; The finishing temperature in finish rolling stage is 850-900 ℃, is preferably 880-900 ℃;
The draft of wherein said rough rolling step is greater than 45%, and the total draft of the whole operation of rolling is not less than 65%;
(4) make through rolling steel cooling, obtain described steel alloy, wherein final cooling temperature is 500-600 ℃, and preferred 540-580 ℃, speed of cooling is 10-35 ℃/s.
11. the method for embodiment 10 when wherein forging described steel billet, is heated to described steel billet earlier after 1150-1200 ℃, preferred 1180-1200 ℃ and insulation, carries out described forging again.
12. the method for embodiment 10 or 11, wherein the draft of rough rolling step is greater than 50%.
13. each method among the embodiment 10-12, wherein said steel billet contains
C：0.03-0.04％，
Cr：2.00-2.99％，
Nb：0.03-0.05％，
Mo：0.20-0.25％，
Ti:0.02-0.03%, more than all be weight percentage.
14. each method among the embodiment 10-12, wherein, described steel billet contains
C：0.03-0.35％，
Cr：3.01-4.99％，
Nb：0.03-0.05％，
Mo：0.20-0.25％，
Ti:0.02-0.03%, more than all be weight percentage.
15. each method among the embodiment 10-14, wherein, described steel billet also contains the Si of 0.15-0.25wt%.
16. each method among the embodiment 10-14, wherein, described steel billet also contains the Si of 0.15-0.20wt%.
17. each method among the embodiment 10-16, wherein, described steel billet also contains the Mn of 0.40-0.60wt%.
18. each method among the embodiment 10-16, wherein, described steel billet also contains the Mn of 0.40-0.50wt%.
19. each method among the embodiment 10-17, wherein, described steel alloy has bainite structure.
Description of drawings
Fig. 1 is optical microstructure's photo of steel A1 of the present invention, A4 and A6, wherein respectively as Fig. 1 a), Fig. 1 b) and Fig. 1 c) be respectively the photo of steel A1 of the present invention, A4 and A6.
Embodiment
Hereinafter, describe the reason based on the numerical value boundary of the operation of alloy compositions and alloy compositions according to the embodiment of the present invention in detail steel alloy of the present invention more.Unless otherwise noted, otherwise " % " in this specification sheets is meant mass percent.
The application's first aspect
A first aspect of the present invention relates to a kind of Cr of containing steel alloy, and it contains
C：0.03-0.07％，
Cr：1.50-4.99％，
Nb：0.03-0.05％，
Mo：0.15-0.25％，
Ti：0.01-0.03％，
All the other are Fe and unavoidable impurities, more than all be weight percentage.
Hereinafter, will describe the present invention in detail according to the reason of the numerical value boundary of the operation of every kind of component and each component.
C (carbon): 0.03-0.07%
C can influence obdurability, the weldability of steel alloy.C content is too high, and weldability can worsen, the toughness variation.C content also should not require low, otherwise smelting technology is not too economical.Therefore, in a first aspect of the present invention, C content is controlled at 0.03-0.07%.In one embodiment, C content can be 0.03-0.04%.In another embodiment, C content can be 0.03-0.035%.
Cr (chromium): 1.50-4.99%
The inventor finds, contains the Cr steel alloy and have good resistant to carbon dioxide local corrosion performance.Particularly Cr content is the steel alloy of 1.50-4.99%, even under the high-pressure carbon dioxide environment, still has good resistant to carbon dioxide local corrosion performance.In the corrosion test of this steel alloy under the high-pressure carbon dioxide environment, this steel alloy can form the special corrosion products film of one deck.Characteristic to corrosion products film studies show that in this layer corrosion products film, significant enrichment takes place Cr, and the density of film and protectiveness are strengthened greatly, plays the effect of half passive film, prevents the generation of local corrosion.Particularly when Cr content surpassed 3%, the enrichment degree of Cr improved greatly in the corrosion products film, fine and close, protectiveness raising that film becomes, and average corrosion rate significantly reduces.But when Cr content surpassed 5%, the weld hardness of steel was bigger, still can not satisfy the requirement of DNV standard.Therefore, in the application's first aspect, Cr content is 1.50-4.99%.In one embodiment, Cr content can be 2.00-2.99%.In another embodiment, Cr content can be 3.01-4.99%.
Nb (niobium): 0.03-0.05%
The steel alloy of the application's first aspect contains the Nb element.The Nb element can crystal grain thinning, reduces the superheated susceptivity and the temper brittleness of steel, improves its intensity; Simultaneously, Nb can improve the ability of anti-hydrogen, nitrogen, ammonia corrosion under the weather-resistant of steel and the high temperature; Nb also can improve the welding property of steel.But too much Nb can reduce the plasticity and the toughness of steel.Therefore, in the application's first aspect, Nb content is controlled to be 0.03-0.05%.
Mo (molybdenum): 0.15-0.25%
The steel alloy of the application's first aspect contains the Mo element.Mo can improve the intensity of steel, particularly hot strength and toughness as the alloy element of steel; Improve the corrosion stability of steel in acid-base solution and liquid metal; Improve the wear resistance of steel and improve hardening capacity, weldability and thermotolerance.The adding of Mo advances on the one hand to have improved corrosion resisting property, and particularly anti-local corrosion performance is if but Mo too high levels (＞1%) can make processing characteristics and plasticity worsen.Therefore, in the application's first aspect, Mo content is 0.15-0.25%.In one embodiment, Mo content can be 0.20-0.25%.
Ti (titanium): 0.01-0.03%,
The steel alloy of the application's first aspect contains the Ti element.Ti is a strong reductor in the steel, and it can make the dense internal organization of steel, crystal grain thinning power; Reduce timeliness susceptibility and cold shortness, improve welding property.First aspect in the application, Ti content is 0.01-0.03%, thereby can improve the recrystallization temperature and the AUSTENITE GRAIN COARSENING temperature of steel, thus the grain-size in control continuous casting and the heat-processed, the yield strength and the toughness effect that play crystal grain thinning, improve steel.In one embodiment, Ti content can be 0.02-0.03%.
Si (silicon): 0.15-0.25%.
Mn (manganese): 0.40-0.60%.
The steel alloy of the application's first aspect can also further contain Si and/or Mn, further to obtain the steel alloy of the present invention that has the optimization synthesis performance at aspects such as erosion resistance, welding property and mechanical strengths.
In one embodiment, Si content can be 0.15-0.25%.In another embodiment, Si content can be 0.15-0.20%.
In one embodiment, Mn content can be 0.40-0.60%.In another embodiment, Mn content can be 0.40-0.50%.
For the application's first aspect contain the Cr steel alloy, for impurity elements such as wherein S, P, O, guarantee it as far as possible in certain controlled range, in case its too high levels causes steel to have other bad performances.In one embodiment, S content is less than 0.006%.In another embodiment, P content is less than 0.012%.In an embodiment again, O content is less than 0.002%.
In one embodiment, this contains the Cr steel alloy and contains:
C：0.03-0.07％，Si：0.15-0.25％，
Mn；0.40-0.60％，Cr：1.50-4.99％，
Nb：0.03-0.05％，Mo：0.15-0.25％，
Ti：0.01-0.03％，
All the other are Fe and unavoidable impurities, more than all be weight percentage.
In one embodiment, this contains the Cr steel alloy and contains:
C：0.03-0.04％，Si：0.15-0.25％，
Mn；0.40-0.60％，Cr：2.00-2.99％，
Nb：0.03-0.05％，Mo：0.20-0.25％，
Ti：0.02-0.03％，
All the other are Fe and unavoidable impurities, more than all be weight percentage.
In one embodiment, this contains the Cr steel alloy and contains:
C：0.03-0.35％，Si：0.15-0.20％，
Mn；0.40-0.50％，Cr：3.01-4.99％，
Nb：0.03-0.05％，Mo：0.20-0.25％，
Ti：0.02-0.03％，
All the other are Fe and unavoidable impurities, more than all be weight percentage.
The Cr steel alloy that contains of the application's first aspect has bainite structure.In one embodiment, in containing in the Cr steel alloy of the application's first aspect, bainite structure can account for the majority of total alloy phase of described steel alloy, and for example, bainite structure can account for more than 50% of total alloy phase of described steel alloy.In another embodiment, bainite structure can account for the 60-90% of total alloy phase of described steel alloy, for example 80-90%.In another embodiment, the described Cr of containing steel alloy mainly comprises bainite structure and ferritic structure, and wherein bainite structure can account for more than 50%, for example can account for 60-90%, as 70-90%.
The application's steel alloy has good welding property and corrosion resistance nature, particularly good resistant to carbon dioxide local corrosion performance, and production cost is low, can be used in as carrying high pressure, carbonated oil gas medium pipe line steel.The Cr of containing steel alloy of the present invention is compared with existing X60-X70 pipe line steel has following advantage:
1. carry under the environment at oil gas, average corrosion rate reduces 3-4 doubly
2. carry under the environment at high-pressure carbon dioxide oil gas, local corrosion does not take place.
The Cr of containing steel alloy of the present invention is compared with existing austenitic stainless steel 316L has following advantage:
1. cost reduces 3-5 doubly
Good weldability, welding efficiency height, do not have the problem of weld cracking.
The application's second aspect
The application's second aspect relates to a kind of transportation pipe line, and it can be made by the Cr steel alloy that contains of the application's first aspect.
The described Cr of the containing steel alloy of each embodiment of the application's first aspect all is applicable to the application's second aspect.
In the application's second aspect, this transportation pipe line can use the Cr steel alloy that contains of the application's first aspect to prepare according to technology known in the art.Because the Cr steel alloy that contains of the application's first aspect has good welding property and corrosion resistance nature, particularly good resistant to carbon dioxide local corrosion performance, thus, the transportation pipe line of the application's second aspect equally also has good resistant to carbon dioxide local corrosion performance and welding property, can be used in to carry high pressure, carbonated oil gas medium.
The application's the third aspect
The application's third aspect relates to the method that contains the Cr steel alloy of making.This method comprises the steps:
(1) provide the steel billet that contains the Cr steel alloy, described steel billet contains
C：0.03-0.07％，
Cr：1.50-4.99％，
Nb：0.03-0.05％，
Mo：0.15-0.25％，
Ti：0.01-0.03％，
(2) forge described steel billet, wherein final forging temperature is not less than 1000 ℃;
(3) make the forged steel billet of process carry out following two stage rolling,
(a) fs is a rough rolling step, and wherein the start rolling temperature of rough rolling step is 1100-1150 ℃, is preferably 1100-1130 ℃; The finishing temperature of rough rolling step is 980-1000 ℃, is preferably 1000 ℃;
(b) subordinate phase is the finish rolling stage, and wherein the start rolling temperature in finish rolling stage is 900-950 ℃, is preferably 930-950 ℃; The finishing temperature in finish rolling stage is 850-900 ℃, is preferably 880-900 ℃;
The draft of wherein said rough rolling step is greater than 45%, and the total draft of the whole operation of rolling is not less than 65%;
(4) make through rolling steel cooling, obtain described steel alloy, wherein final cooling temperature is 500-600 ℃, is preferably 540-580 ℃, and speed of cooling is 10-35 ℃/s.
Above-mentioned each preparation process is below described respectively.
(1) provides steel billet
Provide steel billet followingly to carry out: according to the design mix of the application's steel alloy, behind the required starting material of accurate calculation, to smelt earlier; Then, teeming, the air cooling steel ingot promptly obtains required steel billet to room temperature.In smelting process, can gather the steel sample, carry out composition analysis, to guarantee to satisfy the design requirements of steel.
The smelting of steel can adopt technology known in the art to carry out, and for example carries out in vacuum smelting furnace.In one embodiment, in the smelting process, can utilize Al to carry out deoxidation treatment.In addition, can guarantee to carry out solution treatment under 1600 ℃ of left and right sides temperature, its main purpose is to wish to improve the plasticity and the toughness of steel or alloy, handles for precipitation hardening and gets ready.
(2) forge
Steel billet for obtaining the excellent comprehensive performance, generally need forge after casting.In forging process, final forging temperature is not less than 1000 ℃ usually, to obtain the steel alloy of the present invention that has the optimization synthesis performance at aspects such as erosion resistance, welding property and mechanical strengths.
In one embodiment, can followingly forge:
Described steel billet is heated to 1150-1200 ℃, preferred 1180-1200 ℃ and be incubated for some time (for example 0.5-5 hour, for example 1-2 hour), comes out of the stove and promptly forge; Final forging temperature guarantees to be not less than 1000 ℃.Other controls of forging process can be carried out according to mode known in the art.
(3) rolling
In order to obtain the steel of excellent property, generally need be to being rolled through forged steel billet.In the application's third aspect, rolling technology adopts hot rolling technology usually.
In one embodiment, rolling technology is two stage rolling technologies, wherein
(a) fs is a rough rolling step, and wherein the start rolling temperature of rough rolling step is 1100-1150 ℃, is preferably 1100-1130 ℃; The finishing temperature of rough rolling step is 980-1000 ℃, is preferably 1000 ℃;
(b) subordinate phase is the finish rolling stage, and wherein the start rolling temperature in finish rolling stage is 900-950 ℃, is preferably 930-950 ℃; The finishing temperature in finish rolling stage is 850-900 ℃, is preferably 880-900 ℃;
The draft of wherein said rough rolling step is greater than 50%, and the total draft of the whole operation of rolling is not less than 65%.
The roughing of fs is the roughing of austenite recrystallization district.In one embodiment, the start rolling temperature of rough rolling step is 1100-1150 ℃, is preferably 1100-1130 ℃; The finishing temperature of rough rolling step is 980-1000 ℃, is preferably about 1000 ℃.In one embodiment, for the roughing of this fs, total draft can be greater than 50%.In another embodiment, the roughing of this fs can be carried out a plurality of passages, 2-4 passage for example, and each pass deformation can be greater than 15%～20%.
The finish rolling of subordinate phase is austenite non-recrystallization zone finish rolling.The finish rolling stage carries out in austenite non-recrystallization district, and austenite crystal is fully flattened, and at the inner slip band that forms of crystal grain.In one embodiment, the start rolling temperature in finish rolling stage is 900-950 ℃, is preferably 930-950 ℃; The finishing temperature in finish rolling stage is 850-900 ℃, is preferably 880-900 ℃.In one embodiment, for this finish rolling stage, draft can be 60%.In another embodiment, this finish rolling stage can be carried out a plurality of passages, for example 2-5 passage.
(4) controlled chilling
Carry out controlled chilling to pricking the back steel, thereby obtain the application's steel alloy.What the back steel was rolled in control opens cold temperature, speed of cooling and final cooling temperature, can reach the control phase-change type, and crystal grain thinning and control such as separate out at purpose, can improve character such as the intensity of steel and toughness.
Final cooling temperature is that steel rolls the back and stops the refrigerative temperature during controlled chilling.In fact controlled chilling is exactly the phase transition process of controlling steel, with the structure of steel performance that obtains requiring.Therefore, final cooling temperature is the epochmaking processing parameter of technology for controlled cooling.In a kind of embodiment of the application, final cooling temperature is 500-600 ℃, preferred 540-580 ℃.
Rate of cooling also can influence the phase constitution of the application's steel alloy.In a kind of embodiment of the application, speed of cooling is 10～35 ℃/s, particularly 10-30 ℃/s.
For this technology for controlled cooling, those skilled in the art can select the suitable type of cooling and heat-eliminating medium to carry out.For example, in one embodiment, can adopt the water curtain type of cooling.In another embodiment, can adopt the air cooling mode.
After the controlled chilling step, can be as required in a conventional manner with the further cool to room temperature of steel alloy.
As mentioned above, adopt the method for the application's third aspect, can obtain having the steel alloy of bainite structure, excellent combination properties such as its corrosion resisting property, welding property and mechanical property.In one embodiment, in containing in the Cr steel alloy that the application's third aspect obtains, bainite structure can account for the great majority of total alloy phase of described steel alloy, is mainly contained the steel alloy of bainite structure.For example, in one embodiment, bainite structure can account for more than 50% of total alloy phase of described steel alloy.In another embodiment, bainite structure can account for the 60-90% of total alloy phase of described steel alloy, for example 80-90%.In another embodiment, the described Cr of containing steel alloy can mainly comprise bainite structure and ferritic structure, and wherein bainite structure can account for more than 50%, for example can account for 60-90%, as 70-90%.
Below provide a concrete manufacturing processed of the application's steel alloy:
(1) carries out vacuum metling, teeming according to the method for this area according to design mix;
(2) steel ingot is heated to 1200 ℃ with stove, comes out of the stove behind the insulation 1h and promptly forges; Final forging temperature guarantees to be not less than 1000 ℃;
(3) be rolled
1. the fs is a rough rolling step, guarantee start rolling temperature at 1100 ℃, and finishing temperature is about 1000 ℃; Total draft that also will guarantee steel ingot is greater than 50%.For example, treat that temperature thickness is 32-38mm, rolling through 2 passages, concrete thickness parameter is changed to: 70mm-48mm-34mm;
2. subordinate phase is the finish rolling stage, guarantee start rolling temperature about 930 ℃, and finishing temperature is controlled at about 880 ℃.For example, for rolling into target size, can divide 3 passages to carry out, concrete thickness parameter is: 34mm-24mm-16mm-12mm (3 passage);
(4) afterwards, carry out controlled chilling, temperature was controlled at about 860 ℃ when technology for controlled cooling began, and final cooling temperature is controlled at 540 ℃～580 ℃, and speed of cooling is 10-35 ℃/s.
Thus, promptly can obtain this and contain the Cr steel alloy.
As previously mentioned, adopt the steel alloy of the method preparation of the application's third aspect to have in aspect excellent comprehensive performances such as corrosion resisting property, welding property and mechanical properties, particularly have good resistant to carbon dioxide local corrosion performance and welding property, and production cost is low, can be used in as carrying high pressure, carbonated oil gas medium pipe line steel, make the transportation pipe line.
Embodiment
According to the listed chemical constitution of table 1, through obtaining each steel A1-A6 of the present invention and contrast steel B1-B3 after smelting, forging, rolling, the thermal treatment.
Wherein, steel A1-A6 of the present invention according to following process forge, rolling and thermal treatment:
(1) smelt according to the listed chemical constitution of table 1, will smelt the gained steel ingot and be heated to 1200 ℃ with stove, come out of the stove behind this temperature insulation 1h and promptly forge, final forging temperature guarantees to be not less than 1000 ℃.
(2) steel billet after the rolling forging
(a) carry out the rough rolling step of fs, guarantee start rolling temperature at 1100 ℃, finishing temperature is about 1000 ℃; Total draft of steel ingot is greater than 50%;
(b) subordinate phase is the finish rolling stage, guarantees start rolling temperature about 930 ℃, and finishing temperature is controlled at about 880 ℃;
(3) after steel plate rolling becomes target size, cool off, when beginning to cool down, temperature is controlled at about 860 ℃, and final cooling temperature is controlled at 540 ℃～580 ℃, and speed of cooling is controlled at 10-35 ℃/s.Particularly, the speed of cooling that steel A1 of the present invention adopts is 15 ℃/s, and the speed of cooling that steel A4 of the present invention adopts is 30 ℃/s, and the speed of cooling that steel A6 of the present invention adopts is 35 ℃/s.
Composition according to contrast steel B1-B3 adopts conventional smelting, forging, rolling technology, adopts the speed of cooling of 7 ℃/s, obtains the sample of compared steel B1-B3, and it is organized as sorbite.
Table 1 is the chemical ingredients and the tissue of steel of the present invention and contrast steel, and wherein A1-A6 is a steel of the present invention, and B1-B3 is the contrast steel.
Table 1: the chemical ingredients of test steel (wt, %) (residue is Fe)
Optical microstructure's photo of steel A1 of the present invention, A4 and A6 respectively as Fig. 1 a), Fig. 1 b) and Fig. 1 c) shown in.By the light micrograph shown in this figure as can be known, steel A1 of the present invention, A4 and A6 all have bainite structure, and wherein the ratio of the bainite structure of three kinds of steel sees the following form 2.Particularly, among steel A4 of the present invention and the A6, bainite structure occupies the majority, and reaches 70% and 80% respectively.
Table 2: the ratio measuring result of bainite structure
| Ferrite | Perlite | Bainite | |
| Steel A1 of the present invention | 80％ | 10％ | 10％ |
| Steel A4 of the present invention | 30％ | 70％ | |
| Steel A6 of the present invention | 20％ | 80％ |
Intensity, unit elongation, the hardness value of steel of the present invention and contrast steel, and the impelling strength and the weld decay speed of sign welding property quality see Table 3.As shown in Table 3, the tensile strength of steel of the present invention etc. still also satisfy application requiring a little less than the contrast steel.And importantly, the impelling strength of contrast steel (estimating the key factor of weldability quality) is obviously low than the present invention steel, and the welding property of this explanation contrast steel is obviously poor than steel of the present invention.Another important factor of evaluation is the erosion rate of welding joint.As shown in Table 3, the erosion rate of steel of the present invention all is starkly lower than the contrast steel, and this shows that steel of the present invention has the corrosion resistance nature that obviously is better than contrasting steel; Particularly, steel A4 of the present invention has minimum erosion rate, corrosion resistance nature the best.
Table 3: test steel welded joint mechanical property and corrosive nature
The test experiments of each listed index and condition are as follows in the table 3:
1. erosion rate
Test name: High Temperature High Pressure CO
2Corrosion simulated experiment
Specimen size: the 1/8 circular arc sample of external diameter Φ 72mm, internal diameter Φ 64mm
Testing installation: volume is the High Temperature High Pressure FCZ magnetic force driving reactor of 3L
Experimental temperature: 80 ℃
CO
2Dividing potential drop: 1.0MPa
Experimental period: 168h
Flow velocity: 1m/s
The experimental solutions medium: simulation oil field extraction liquid, utilize the preparation of deionized water and analytical reagent, chemical ingredients is as shown in table 4, feeds N before experiment
2Deoxygenation continues to feed CO in the experimentation
2Solution is reached capacity.
The ionic concn of table 4 experimental solutions medium
2. mechanical property
Mechanical property is carried out according to following standard:
GB2649-89 " welding joint mechanical property sample sampling method "
GB2650-89 " welding joint impact test method ": Charpy V test is carried out on the JB-300B shock-testing machine.Specimen size: 55 * 10 * 5mm. welding joint impact experiment temperature is-30 ℃
GB2651-89 " welding joint stretching test method ": be of a size of 120 * 18 * 3mm sheet sample, weld seam is positioned at the sample center, carries out tension test on the MTS810 tensile testing machine.
Claims (19)
1. one kind contains the Cr steel alloy, and it contains
C：0.03-0.07％，
Cr：1.50-4.99％，
Nb：0.03-0.05％，
Mo：0.15-0.25％，
Ti：0.01-0.03％，
All the other are Fe and unavoidable impurities, more than all be weight percentage.
Claim 1 contain the Cr steel alloy, wherein, contain
C：0.03-0.04％，
Cr：2.00-2.99％，
Nb：0.03-0.05％，
Mo：0.20-0.25％，
Ti:0.02-0.03%, more than all be weight percentage.
Claim 1 contain the Cr steel alloy, wherein, contain
C：0.03-0.35％，
Cr：3.01-4.99％，
Nb：0.03-0.05％，
Mo：0.20-0.25％，
Ti:0.02-0.03%, more than all be weight percentage.
Among the claim 1-3 each contain the Cr steel alloy, wherein, also contain the Si of 0.15-0.25wt%.
Among the claim 1-3 each contain the Cr steel alloy, wherein, also contain the Si of 0.15-0.20wt%.
Among the claim 1-5 each contain the Cr steel alloy, wherein, also contain the Mn of 0.40-0.60wt%.
Among the claim 1-5 each contain the Cr steel alloy, wherein, also contain the Mn of 0.40-0.50wt%.
Among the claim 1-7 each contain the Cr steel alloy, wherein said steel alloy has bainite structure.
9. transportation pipe line, it is made by each the Cr steel alloy that contains among the claim 1-8.
10. a manufacturing contains the method for Cr steel alloy, comprises the steps:
(1) provide the steel billet that contains the Cr steel alloy, described steel billet contains
C：0.03-0.07％，
Cr：1.50-4.99％，
Nb：0.03-0.05％，
Mo：0.15-0.25％，
Ti：0.01-0.03％，
(2) forge described steel billet, wherein final forging temperature is not less than 1000 ℃;
(3) make the forged steel billet of process carry out following two stage rolling,
(a) fs is a rough rolling step, and wherein the start rolling temperature of rough rolling step is 1100-1150 ℃, is preferably 1100-1130 ℃; The finishing temperature of rough rolling step is 980-1000 ℃, is preferably 1000 ℃;
(b) subordinate phase is the finish rolling stage, and wherein the start rolling temperature in finish rolling stage is 900-950 ℃, is preferably 930-950 ℃; The finishing temperature in finish rolling stage is 850-900 ℃, is preferably 880-900 ℃;
The draft of wherein said rough rolling step is greater than 45%, and the total draft of the whole operation of rolling is not less than 65%;
(4) make through rolling steel cooling, obtain described steel alloy, wherein final cooling temperature is 500-600 ℃, is preferably 540-580 ℃, and speed of cooling is 10-35 ℃/s.
11. the method for claim 10 when wherein forging described steel billet, is heated to described steel billet earlier after 1150-1200 ℃, preferred 1180-1200 ℃ and insulation, carries out described forging again.
12. the method for claim 10 or 11, wherein the draft of rough rolling step is greater than 50%.
13. each method among the claim 10-12, wherein said steel billet contains
C：0.03-0.04％，
Cr：2.00-2.99％，
Nb：0.03-0.05％，
Mo：0.20-0.25％，
Ti:0.02-0.03%, more than all be weight percentage.
14. each method among the claim 10-12, wherein, described steel billet contains
C：0.03-0.35％，
Cr：3.01-4.99％，
Nb：0.03-0.05％，
Mo：0.20-0.25％，
Ti:0.02-0.03%, more than all be weight percentage.
15. each method among the claim 10-14, wherein, described steel billet also contains the Si of 0.15-0.25wt%.
16. each method among the claim 10-14, wherein, described steel billet also contains the Si of 0.15-0.20wt%.
17. each method among the claim 10-16, wherein, described steel billet also contains the Mn of 0.40-0.60wt%.
18. each method among the claim 10-16, wherein, described steel billet also contains the Mn of 0.40-0.50wt%.
19. each method among the claim 10-17, wherein, described steel alloy has bainite structure.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104862607A (en) * | 2015-05-25 | 2015-08-26 | 北京科技大学 | Pipeline steel resistant to carbon dioxide corrosion and preparation method thereof |
| CN106011666A (en) * | 2016-06-03 | 2016-10-12 | 深圳市樊溪电子有限公司 | Low alloy steel, steel pipe and manufacturing method of steel pipe |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101353765A (en) * | 2007-07-23 | 2009-01-28 | 宝山钢铁股份有限公司 | Steel for CT80 grade coiled tubing, and manufacturing method and use thereof |
| CN101487101A (en) * | 2008-01-17 | 2009-07-22 | 宝山钢铁股份有限公司 | Steel for CT70 grade coiled tubing and method of manufacturing the same |
| CN102071361A (en) * | 2009-11-20 | 2011-05-25 | 宝山钢铁股份有限公司 | Steel for high temperature resistant oil well tube and manufacturing method thereof |
-
2011
- 2011-06-09 CN CN201110154407.6A patent/CN102230133B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101353765A (en) * | 2007-07-23 | 2009-01-28 | 宝山钢铁股份有限公司 | Steel for CT80 grade coiled tubing, and manufacturing method and use thereof |
| CN101487101A (en) * | 2008-01-17 | 2009-07-22 | 宝山钢铁股份有限公司 | Steel for CT70 grade coiled tubing and method of manufacturing the same |
| CN102071361A (en) * | 2009-11-20 | 2011-05-25 | 宝山钢铁股份有限公司 | Steel for high temperature resistant oil well tube and manufacturing method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 《机械工程材料》 20101231 胡丽华 等 含铬管线钢的显微组织和力学性能 第51-58页 8-9 第34卷, 第12期 * |
| 《材料热处理学报》 20100331 胡丽华 等 Cr含量对低合金耐蚀管线钢焊接接头组织和性能的影响 1-19 第31卷, 第3期 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104862607A (en) * | 2015-05-25 | 2015-08-26 | 北京科技大学 | Pipeline steel resistant to carbon dioxide corrosion and preparation method thereof |
| CN104862607B (en) * | 2015-05-25 | 2017-01-18 | 北京科技大学 | Pipeline steel resistant to carbon dioxide corrosion and preparation method thereof |
| CN106011666A (en) * | 2016-06-03 | 2016-10-12 | 深圳市樊溪电子有限公司 | Low alloy steel, steel pipe and manufacturing method of steel pipe |
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