CN105803307A - Steel special for power plant fan and manufacturing method of steel - Google Patents
Steel special for power plant fan and manufacturing method of steel Download PDFInfo
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- CN105803307A CN105803307A CN201610154109.XA CN201610154109A CN105803307A CN 105803307 A CN105803307 A CN 105803307A CN 201610154109 A CN201610154109 A CN 201610154109A CN 105803307 A CN105803307 A CN 105803307A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to steel special for a power plant fan and a manufacturing method of the steel. Chemical components of the special steel include 0.04%-0.25% of C, 0.2%-0.8% of Si, 0.40%-1.6% of Mn, 0-0.020% of P, 0-0.010% of S, 0.2%-0.5% of Cu, 0.05%-0.9% of Cr, 0.01%-0.05% of Ti, 0-0.04% of Nb, 0.05%-0.2% of Ni, and the balance Fe and unavoidable impurity elements. The steel special for the power plant fan and the manufacturing method of the steel belong to the field of manufacturing of low alloy steel. The manufacturing method includes the steps of molten iron deep desulphurization, converter top-bottom combined blowing, LF refining, RH vacuum circulation degassing, whole-course protective casting, continuous casting billet and cold billet reheating, descaling, rolling, cooling and finishing. According to the steel manufactured through the method, the yield strength is higher than or equal to 355 MPa, the tensile strength is higher than or equal to 500 MPa, the elongation is 25% or above, and the low-temperature toughness and corrosion resistance are good.
Description
Technical field
The present invention relates to a kind of power plant fans special-purpose steel and manufacture method thereof, be specifically related to one and there is high-strength corrosion-resisting
355MPa level Si-Mn-Cu-Cr system's power plant fans special-purpose steel and manufacture method, belong to manufacture field of low alloy steel.
Background technology
In large-scale thermal power station, the fuels such as coal that used, heavy oil etc. the most more or less contain sulfur, its waste gas that burns
In sulfur dioxide some be oxidized to sulfur trioxide, this sulfur trioxide can with the steam in waste gas be combined into sulphuric acid steam
Gas, to low temperature position, as the equipment such as air-introduced machine condense into sulfate liquid, causes corrosion.Power plant fans equipment is heating power system of power plant
The important component part of system, requires the highest to serviceability, and in equipment, blower fan steel typically uses straight carbon steel Q235B, cast iron etc.
Material manufactures, but straight carbon steel exists the most corrosion-resistant, and cast iron exists the problems such as poor toughness, and straight carbon steel duration of service often reaches not
To the use requirement of 20 years, only 2-3, just there is various problem because of corrosion, therefore, to having in large-scale thermal power station
The demand of corrosion resistance blower fan steel plate is the most urgent.The present invention is a kind of power plant fans special-purpose steel, it is possible to achieve high intensity, corrosion resistant
Erosion, can extend service life more than 3 times, is the important materials of conventional power plants blower fan steel update.
Summary of the invention
For for problems of the prior art, the invention provides a kind of power plant fans special-purpose steel and manufacturer thereof
Method, a kind of 355MPa level Si-Mn-Cu-Cr system power plant fans special-purpose steel with high-strength corrosion-resisting.
The chemical composition of a kind of 355MPa level Si-Mn-Cu-Cr system power plant fans special-purpose steel is C 0.04-0.25%, Si
0.2-0.8%, Mn 0.40-1.6%, P≤0.020%, S≤0.010%, Cu 0.2-0.5%, Cr 0.05-0.9%, Ti 0.01-
0.05%, Nb≤0.04%, Ni 0.05-0.2%, surplus is Fe and other inevitable impurity elements.The present invention utilizes Si-
The corrosion resistant synergism of Mn-Cu-Cr element, in conjunction with microalloy element Mn, Ti, Nb controlled rolling and control cooling procedure
In the complex intensifying mechanism of precipitation strength, refined crystalline strengthening and precipitation strength, it is achieved that power plant of 355MPa level Si-Mn-Cu-Cr system
The manufacturing of blower fan special-purpose steel.
In the power plant fans special-purpose steel chemical composition that the present invention relates to, the effect of each element is as follows:
C: commonly act as intensified element in steel, if dissolving in the effect that can play solution strengthening in matrix.C content increase can make
Carbon, presented in carbide, is unfavorable for obtaining single uniform tissue, and the distribution that C atom easily occurs is uneven, forms high-carbon
District, so can make to produce between each microcell difference in Electrode Potential, can reduce the atmospheric corrosion resistance ability of steel, but suitable C content can
To improve intensity and anti-wear performance.Therefore the present invention uses the carbon of 0.04-0.18% to design, and utilizes the microalloy such as C Yu Ti, Nb
The effect of element combination performance refined crystalline strengthening and precipitation strength improves the intensity of weathering steel.
Si: there is in steel higher solid solubility, mainly improve the intensity of steel with the form of solution strengthening.The present invention adopts
Design with the content of 0.2-0.8%.
Mn: have stronger solution strengthening effect, can significantly reduce the phase transition temperature of steel, improves intensity and the hardness of steel.
In steelmaking process, Mn is good deoxidizer and desulfurizing agent.Mn with Cu is combined the synergism of interpolation can improve the resistance to of steel
Corrosive nature.But Mn amount is too high, weaken the resistance to corrosion of steel, reduce toughness and the welding performance of steel, so the present invention is by it
Content controls at 0.6-1.6%.
P: in the ordinary course of things, P are the harmful elements in steel, increase the cold brittleness of steel, reduce toughness and the plasticity of steel, make welding
Performance depreciation.Therefore the present invention designs its content is≤0.020%.
S: S is also harmful element under normal conditions.S is as residual elements in the present invention, control its content for≤
0.010%。
Cu: have the effect of solution strengthening and precipitation strength in steel, can improve intensity and toughness, particularly improve resistance to greatly
Gas corrosion performance.Shortcoming is easily to produce hot-short when hot-working, and copper content significantly reduces more than 0.5% plasticity.Cu in the present invention
Content be 0.20-0.50%.
The Match of elemental compositions such as Cu, the Si in Cr:Cr element and steel, can significantly improve the decay resistance of steel.The raising of Cr content,
Can guarantee that intensity and the corrosion resistance of steel.Cr content is 0.05-0.90%.
The effective pinning austenite grain boundary of nitride energy of Ti: be strong nitride forming element, Ti, suppression slab reheats
During the growing up of austenite crystal, during recrystallization controlled rolling, suppress growing up of ferrite crystal grain, it is thus achieved that thin simultaneously
Little uniform tissue；Utilize low temperature to separate out the precipitation strength effect of TiC to improve intensity simultaneously.
Nb: be carbide, has the precipitation strength effect of significant crystal grain thinning and moderate strength, commonly
Adding Nb in low-alloy steel, can improve the austenite recrystallization temperature of steel, interpolation compound with Ti is by precipitation strength and refined crystalline strengthening
Improve the intensity of steel.
The manufacture method of above-mentioned 355MPa level Si-Mn-Cu-Cr system power plant fans special-purpose steel:
The smelting of steel: KR molten iron takes off S, converter top bottom blowing, terminal point control: tapping temperature 1600-1670 DEG C, deoxidation deeply
Alloying, alloy addition is C:0.04-0.25%, Si:0.2-0.8%, Mn:0.40-1.6%, P≤0.020%, S≤
0.010%, Cu:0.2-0.5%, Cr:0.05-0.9%, Ti:0.01-0.05%, Nb≤0.04%, Ni 0.05-0.2%, surplus is
Fe and other inevitable impurity elements, strengthen big bag deoxidation；LF refine, makes white slag；RH vacuum circulation degassing technique, vacuum
Degree 100pa, with lower pumping 12 minutes, fully removes gas, obtains continuous casting billet, stacking slow cooling after continuous casting billet cutting.
The rolling of steel plate: cold for continuous casting billet base is heated to the 1200-1280 DEG C of abundant austenitizing of temperature range, more than 1180
DEG C de-scaling, uses two-stage control rolling, and controlling roughing start rolling temperature interval is 1150 DEG C-1200 DEG C, uses single stand four-roller
Reversable mill rolling three to five roads, accumulation reduction ratio is not less than 45%；Finish rolling uses four roll reversing rollers to realize controlled rolling, essence
Rolling start rolling temperature interval is 950 DEG C-1050 DEG C, finish rolling finishing temperature 800 DEG C-900 DEG C, and finish rolling accumulation reduction ratio is not less than 70%,
Roller repairing cooling rate 5-20 DEG C/S, final cooling temperature 600-680 DEG C, steel plate is carried out finishing, trimming and get final product.
Compared with existing power plant fans steel, the invention has the beneficial effects as follows:
1. the power plant fans special-purpose steel that the present invention provides belongs to low-alloy high-strength corrosion resisting steel, and its yield strength is at 355MPa
Above, tensile strength is at more than 500MPa, and elongation percentage is more than 25%, and-40 DEG C of Charpy-V impact powers are more than 80J.With Q235B straight carbon steel
Comparing, corrosion-resistant good, intensity is high, good toughness, adapts to the development trend of steel products environmental protection minimizing.
Power plant fans special-purpose steel the most of the present invention chemical composition, use Si-Mn-Cu-Cr series components design, add
Si, Mn element of high level and tiny alloying element Ti, Nb, use corrosion-resistant Si, Cu, Cr element, it is ensured that in power station environment
Decay resistance, uses Mn, Ti, Nb element, it is ensured that the high intensity of steel.The blower fan steel that the present invention provides is in power station environment
Having stronger corrosion-resistant effect, service life is more than 3 times of Q235B common fan blade steel.
The manufacture method of power plant fans special-purpose steel the most of the present invention provides steel plate rolling descaling process, it is possible to obtain surface
Clean smooth steel plate.
The production technology of steel the most of the present invention is two-stage control rolling, is conducive to obtaining the tissue of fine uniform, improves steel
Strong plasticity and low-temperature flexibility.It is made without heat treatment, can supply by rolled, reduce production cost.
Accompanying drawing explanation
Fig. 1 is the micro-organization chart of steel plate of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment further describe the present invention, advantages of the present invention and feature will be with describe and
Apparent.But embodiment is only exemplary, the scope of the present invention is not constituted any restriction.Those skilled in the art should
It should be appreciated that, the details of technical solution of the present invention and form can be repaiied lower without departing from the spirit and scope of the present invention
Change or replace, but these amendments and replacement each fall within protection scope of the present invention.
Detailed description of the invention
Specific embodiment is set forth below, and the present invention is further elaborated, but the present invention is had absolutely not any by these embodiments
Limit.Any variation that those skilled in the art are made in implementing the present invention under the enlightenment of this specification all will fall in right
In the range of claim.
Embodiment 1 one kinds 355MPa level Si-Mn-Cu-Cr system power plant fans special-purpose steel
(1) manufacture of the present embodiment steel: according to composition of steel requirement of the present invention, uses molten iron deeply to take off S, converter top bottom blowing,
RH vacuum circulation degassing technique, whole process molding casting, the embodiment 1 shown in chemical component table 1 of steel.Rolling Production process is adopted
With two-part controlled rolling, Controlled cooling process and high temperature descaling process, the embodiment 1 that technological parameter is shown in Table 2, mechanical property
The embodiment 1 that can be shown in Table 3.
(2) decay resistance test: with straight carbon steel Q235 sample as a comparison, respectively takes 3 pieces of samples, with reference to JB/T7901-
1999 standards carry out 24h sulphuric acid immersion test, and test(ing) medium condition chooses 20% sulphuric acid temperature 20 DEG C, 50% sulphuric acid temperature respectively
70 DEG C of two kinds of environment (simulative power plant working environment), result of the test is shown in Table 4 embodiments 1.
Embodiment 2 one kinds 355MPa level Si-Mn-Cu-Cr system power plant fans special-purpose steel
(1) manufacture of the present embodiment steel: according to composition of steel requirement of the present invention, uses molten iron deeply to take off S, converter top bottom blowing,
RH vacuum circulation degassing technique, whole process molding casting, the embodiment 2 shown in chemical component table 1 of steel.Rolling Production process is adopted
With two-part controlled rolling, Controlled cooling process and high temperature descaling process, the embodiment 2 that technological parameter is shown in Table 2, mechanical property
The embodiment 2 that can be shown in Table 3.
(2) decay resistance test: with straight carbon steel Q235 sample as a comparison, respectively takes 3 pieces of samples, with reference to JB/T7901-
1999 standards carry out 24h sulphuric acid immersion test, and test(ing) medium condition chooses 20% sulphuric acid temperature 20 DEG C, 50% sulphuric acid temperature respectively
70 DEG C of two kinds of environment (simulative power plant working environment), result of the test is shown in Table 4 embodiments 2.
Embodiment 3 one kinds 355MPa level Si-Mn-Cu-Cr system power plant fans special-purpose steel
(1) manufacture of the present embodiment steel: according to composition of steel requirement of the present invention, uses molten iron deeply to take off S, converter top bottom blowing,
RH vacuum circulation degassing technique, whole process molding casting, the embodiment 3 shown in chemical component table 1 of steel.Rolling Production process is adopted
With two-part controlled rolling, Controlled cooling process and high temperature descaling process, the embodiment 3 that technological parameter is shown in Table 2, mechanical property
The embodiment 3 that can be shown in Table 3.
(2) decay resistance test: with straight carbon steel Q235 sample as a comparison, respectively takes 3 pieces of samples, with reference to JB/T7901-
1999 " metal material test chamber homogeneous corrosion total immersion test method " standard carries out 24h sulphuric acid immersion test, test(ing) medium condition
Choose 20% sulphuric acid temperature 20 DEG C, 50% sulphuric acid temperature 70 C two media (simulative power plant working environment), result of the test respectively
It is shown in Table 4 embodiments 3.
The chemical composition (mass percent, %) of table 1 embodiment 1-3 steel and reference steel
Table 2 embodiment 1-3 steel production process technology parameter
The mechanical property of table 3 embodiment 1-3 steel
Table 4 simulative power plant environment embodiment 1-3 steel and Q235B steel corrosion rate
The microstructure observation of embodiment 4 steel grade of the present invention, result is as shown in Figure 1.
In sum, the yield strength of the embodiment of the present invention 1, embodiment 2 and embodiment 3 gained steel all reach 355MPa with
On, elongation percentage is more than 22%, and low-temperature impact toughness is good, and decay resistance is substantially better than Q235B, reach 3 times of Q235B with
On.The Si-Mn-Cu-Cr system power plant fans steel that the visible present invention provides can replace Q235B steel plate completely.
Claims (8)
1. a power plant fans special-purpose steel, it is characterised in that power plant fans special-purpose steel is power plant of 355MPa level Si-Mn-Cu-Cr system
Blower fan special-purpose steel, described special-purpose steel is grouped into by the one-tenth of following weight percentage ratio: C 0.04-0.25%, Si 0.2-0.8%, Mn
0.40-1.6%, P≤0.020%, S≤0.010%, Cu 0.2-0.5%, Cr 0.05-0.9%, Ti 0.01-0.05%, Nb≤
0.04%, Ni 0.05-0.2%, surplus is Fe and other inevitable impurity elements.
Power plant fans special-purpose steel the most according to claim 1, it is characterised in that described special-purpose steel is by following weight percentage ratio
One-tenth be grouped into: C 0.07%, Si 0.45%, Mn 1%, P 0.010%, S 0.04%, Cu 0.27%, Cr 0.55%, Ti
0.017%, Nb 0.015%, Ni 0.1%, surplus is Fe and other inevitable impurity elements.
Power plant fans special-purpose steel the most according to claim 1, it is characterised in that described special-purpose steel is by following weight percentage ratio
One-tenth be grouped into: C 0.1%, Si 0.3%, Mn 1.3%, P 0.015, S 0.0042, Cu 0.32%, Cr 0.60%, Ti
0.022%, Nb 0.021, Ni 0.07%, surplus is Fe and other inevitable impurity elements.
Power plant fans special-purpose steel the most according to claim 1, it is characterised in that described special-purpose steel is by following weight percentage ratio
One-tenth be grouped into: C 0.16%, Si 0.26%, Mn 1.42%, P 0.08%, S 0.005%, Cu 0.32%, Cr 0.45%, Ti
0.028%, Nb 0.02%, Ni 0.2%, surplus is Fe and other inevitable impurity elements.
5. the manufacture method of power plant fans special-purpose steel as claimed in claim 1, concrete steps include:
The smelting of steel: KR molten iron takes off S, converter top bottom blowing, terminal point control: tapping temperature 1600-1670 DEG C, deoxidation deeply
Alloying, alloy addition is C:0.04-0.25%, Si:0.2-0.8%, Mn:0.40-1.6%, P≤0.020%, S≤
0.010%, Cu:0.2-0.5%, Cr:0.05-0.9%, Ti:0.01-0.05%, Nb≤0.04%, Ni 0.05-0.2%, surplus is
Fe and other inevitable impurity elements, strengthen big bag deoxidation；LF refine, makes white slag；RH vacuum circulation degassing skill, vacuum
100pa, with lower pumping 12 minutes, fully removes gas, obtains continuous casting billet, stacking slow cooling after continuous casting billet cutting；
The rolling of steel plate: cold for continuous casting billet base is heated to the 1200-1280 DEG C of abundant austenitizing of temperature range, removes more than 1180 DEG C
Squama, uses two-stage control rolling, and controlling roughing start rolling temperature interval is 1150 DEG C-1200 DEG C, uses single stand four-roller reversible
Mill milling three to five road, accumulation reduction ratio is not less than 45%；Finish rolling uses four roll reversing rollers to realize controlled rolling, and finish rolling is opened
Rolling temperature range is 950 DEG C-1050 DEG C, finish rolling finishing temperature 800 DEG C-900 DEG C, and finish rolling accumulation reduction ratio is not less than 70%, after rolling
Cooling cooling rate 5-20 DEG C/S, final cooling temperature 600-680 DEG C, steel plate is carried out finishing, trimming and get final product.
6. the manufacture method of power plant fans special-purpose steel as claimed in claim 2, concrete steps include:
The smelting of steel: KR molten iron takes off S, converter top bottom blowing, terminal point control: tapping temperature 1600-1670 DEG C, deoxidation deeply
Alloying, alloy addition is: C 0.07%, Si 0.45%, Mn 1%, P 0.010%, S 0.04%, Cu 0.27%, Cr
0.55%, Ti 0.017%, Nb 0.015%, Ni 0.1%, surplus is Fe and other inevitable impurity elements, and the big bag of strengthening is de-
Oxygen；LF refine, makes white slag；RH vacuum circulation degassing skill, vacuum 100pa, with lower pumping 12 minutes, fully removes gas, must connect
Strand, stacking slow cooling after continuous casting billet cutting；
The rolling of steel plate: cold for continuous casting billet base is heated to 1250 DEG C of abundant austenitizings, more than 1180 DEG C of de-scalings, uses two benches
Controlled rolling, controlling roughing start rolling temperature is 1170 DEG C, uses single stand four-roller reversable mill rolling three to five roads, accumulation pressure
Rate 75%；Finish rolling uses four roll reversing rollers to realize controlled rolling, and finish rolling start rolling temperature interval is 980 DEG C, finish rolling finishing temperature
870 DEG C, finish rolling accumulation reduction ratio is not less than 88%, 10 DEG C/S of roller repairing cooling rate, and final cooling temperature 620 DEG C carries out essence to steel plate
Whole, trimming and get final product.
7. the manufacture method of power plant fans special-purpose steel as claimed in claim 3, concrete steps include:
The smelting of steel: KR molten iron takes off S, converter top bottom blowing, terminal point control: tapping temperature 1600-1670 DEG C, deoxidation deeply
Alloying, alloy addition is C 0.1%, Si 0.3%, Mn 1.3%, P 0.015, S 0.0042, Cu 0.32%, Cr 0.60%,
Ti 0.022%, Nb 0.021, Ni 0.07%, surplus is Fe and other inevitable impurity elements, strengthens big bag deoxidation；LF
Refine, makes white slag；RH vacuum circulation degassing skill, vacuum 100pa, with lower pumping 12 minutes, fully removes gas, obtains continuous casting billet,
Stacking slow cooling after continuous casting billet cutting；
The rolling of steel plate: cold for continuous casting billet base is heated to 1230 DEG C of abundant austenitizings, more than 1180 DEG C of de-scalings, uses two benches
Controlled rolling, controlling roughing start rolling temperature is 1150 DEG C, uses single stand four-roller reversable mill rolling three to five roads, accumulation pressure
Rate 65%；Finish rolling uses four roll reversing rollers to realize controlled rolling, and finish rolling start rolling temperature interval is 950 DEG C, finish rolling finishing temperature
850 DEG C, finish rolling accumulation reduction ratio is not less than 75%, 14 DEG C/S of roller repairing cooling rate, and final cooling temperature 640 DEG C carries out essence to steel plate
Whole, trimming and get final product.
8. the manufacture method of power plant fans special-purpose steel as claimed in claim 4, concrete steps include:
The smelting of steel: KR molten iron takes off S, converter top bottom blowing, terminal point control: tapping temperature 1600-1670 DEG C, deoxidation deeply
Alloying, alloy addition is C 0.16%, Si 0.26%, Mn 1.42%, P 0.08%, S 0.005%, Cu 0.32%, Cr
0.45%, Ti 0.028%, Nb 0.02%, Ni 0.2%, surplus is Fe and other inevitable impurity elements, and the big bag of strengthening is de-
Oxygen；LF refine, makes white slag；RH vacuum circulation degassing skill, vacuum 100pa, with lower pumping 12 minutes, fully removes gas, must connect
Strand, stacking slow cooling after continuous casting billet cutting；
The rolling of steel plate: cold for continuous casting billet base is heated to 1240 DEG C of abundant austenitizings, more than 1180 DEG C of de-scalings, uses two benches
Controlled rolling, controlling roughing start rolling temperature is 1170 DEG C, uses single stand four-roller reversable mill rolling three to five roads, accumulation pressure
Rate 55%；Finish rolling uses four roll reversing rollers to realize controlled rolling, and finish rolling start rolling temperature interval is 960 DEG C, finish rolling finishing temperature
860 DEG C, finish rolling accumulation reduction ratio is not less than 75%, 14 DEG C/S of roller repairing cooling rate, and final cooling temperature 680 DEG C carries out essence to steel plate
Whole, trimming and get final product.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110983204A (en) * | 2019-12-03 | 2020-04-10 | 山东钢铁股份有限公司 | Steel plate for engineering machinery and preparation method |
| CN114318114A (en) * | 2021-12-30 | 2022-04-12 | 本钢板材股份有限公司 | Chemical components of special steel for BGHBJ400 type crane boom and manufacturing method thereof |
| CN115505852A (en) * | 2022-10-26 | 2022-12-23 | 河北普阳钢铁有限公司 | Corrosion-resistant steel for agricultural machinery and manufacturing method thereof |
| CN116891976A (en) * | 2023-07-25 | 2023-10-17 | 鞍钢股份有限公司 | 400 Mpa-grade low Wen Haigong steel plate with good wear resistance and preparation method thereof |
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| CN110983204A (en) * | 2019-12-03 | 2020-04-10 | 山东钢铁股份有限公司 | Steel plate for engineering machinery and preparation method |
| CN114318114A (en) * | 2021-12-30 | 2022-04-12 | 本钢板材股份有限公司 | Chemical components of special steel for BGHBJ400 type crane boom and manufacturing method thereof |
| CN115505852A (en) * | 2022-10-26 | 2022-12-23 | 河北普阳钢铁有限公司 | Corrosion-resistant steel for agricultural machinery and manufacturing method thereof |
| CN116891976A (en) * | 2023-07-25 | 2023-10-17 | 鞍钢股份有限公司 | 400 Mpa-grade low Wen Haigong steel plate with good wear resistance and preparation method thereof |
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Application publication date: 20160727 |