CN101560629B - Hot rolling strip steel having yield strength being higher than 800MPa and preparation method thereof - Google Patents
Hot rolling strip steel having yield strength being higher than 800MPa and preparation method thereof Download PDFInfo
- Publication number
- CN101560629B CN101560629B CN2009100117423A CN200910011742A CN101560629B CN 101560629 B CN101560629 B CN 101560629B CN 2009100117423 A CN2009100117423 A CN 2009100117423A CN 200910011742 A CN200910011742 A CN 200910011742A CN 101560629 B CN101560629 B CN 101560629B
- Authority
- CN
- China
- Prior art keywords
- finish rolling
- yield strength
- hot rolled
- rolled strip
- 800mpa
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a hot rolling strip steel having the yield strength being higher than 800MPa and a preparation method thereof, belonging to the field of metallurgical technology. The hot rolling strip steel comprises the components according to the weight percentage: 0.08-0.14% of C, 0.01-0.20% of Si, 1.70-2.20% of Mn, 0.04-0.07% of Nb, 0.00-0.07% of V, 0.08-0.18% of Ti, less than 0.01% of P, less than 0.01% of S and the rest of Fe. The yield strength of the hot rolling strip steel is more than or equal to 800MPa. The preparation method comprises molten steel is smelted according to the set components and then casted into casting blank; after being heated, the casting blank is processed by rough rolling to obtain intermediate blank; then, after precision rolling is carried out, the thickness of the strip steel is 2-14mm; finally, the finished product hot rolling strip steel is obtained after being cooled and wound. The hot rolling strip steel has good low-temperature flexibility and low production cost.
Description
Technical field
The invention belongs to the material technology field, particularly a kind of yield strength is higher than hot rolled strip of 800MPa and preparation method thereof.
Background technology
Along with society and expanding economy, the pressure of the saving resource that Iron And Steel Industry faced, save energy, protection environment is increasing.Adopted when obtaining the steel grade of this intensity rank both at home and abroad is the thought of alloying more in the past, and this has caused the increase of steel product cost, simultaneously the difficulty that increases the recycling that has also increased the steel later stages of alloying element.Simultaneously, the iron and steel downstream user is more and more higher to the requirement of equipment lightweight, safety, discharge, reduce cost control and fuel economy, in order to successfully manage this problem, development technique content height, the high-strength steel that added value is high have become the emphasis of ferrous materials research field in recent years.The scholars such as Yoshimasa FUNAKAWA of Japan have introduced in 1945～1951 pages of articles of delivering of 11 phases of ISIJ International in 2004 and have adopted interpolation Ti and Mo to obtain the method for high-strength steel.The carbide that is organized as distribution nano-scale on the ferrite matrix of this steel, when the atomicity ratio of Ti and Mo during in 1 left and right sides, the performance of steel is best, yield strength has to preferable performance more than 700MPa, and its steel product ingredient is: C 0.047%, Si 0.22%, Mn 1.59%, and P 0.002%, S
0.001％，N?0.004％，Ti?0.082％，Mo?0.20％。This studies show that, has only to add Ti and Mo simultaneously and have to have certain proportion, and the yield strength of steel just can reach more than the 700MPa, and the add-on of Mo element also has bigger influence to steel performance simultaneously, brings difficulty for the smelting of steel.Alloying elements such as the 600MPa of each big steel mill actual production such as external Sweden SSAB and domestic Anshan iron and steel plant, Baosteel, Mo, the Cr that 700MPa level hot-rolling high-strength steel has all added high added value to some extent, Ni, the hot rolled strip of higher category needs follow-up thermal treatment process, and these have brought the significantly increase of production cost.
Summary of the invention
At above technical problem, the invention provides a kind of yield strength and be higher than hot rolled strip of 800MPa and preparation method thereof, purpose is to improve by the intensity that makes hot rolled strip under the situation of adding alloying element less, in order to replace same rank or low-level Hi-Stren steel.
The hot rolled strip chemical ingredients that yield strength of the present invention is higher than 800MPa is C0.08～0.14% by weight percentage, Si0.01～0.20%, Mn 1.70～2.20%, and Nb 0.04～0.07%, V0.00～0.07%, Ti0.08～0.18%, P＜0.01%, S＜0.01%, surplus is iron Fe, its metallographic structure is that grain-size is the ferrite of 2～4 μ m, 10～20% bainite and a small amount of pearlitic heterogeneous structure; This hot rolled strip yield strength is more than or equal to 800MPa, and tensile strength is more than or equal to 890MPa, and elongation after fracture is more than or equal to 18%.
Preparation method of the present invention carries out according to the following steps:
1, by the set component smelting molten steel and cast strand, its composition is C0.08～0.14% by weight percentage, Si0.01～0.20%, Mn 1.70～2.20%, and Nb 0.04～0.07%, V0.00～0.07%, Ti0.08～0.18%, P＜0.01%, S＜0.01%, surplus is iron Fe, and slab thickness is 220～250mm.
2, strand is heated to 1220～1280 ℃, carries out roughing, the roughing process is 3～5 passages, and the roughing start rolling temperature is 1120～1170 ℃, and the roughing finishing temperature is 980～1070 ℃, and obtaining thickness is the intermediate blank of 38～50mm.
3, intermediate blank is carried out finish rolling, the finish rolling process is 5～7 passages, and the finish rolling start rolling temperature is 950～1000 ℃, and the finish rolling finishing temperature is 760～860 ℃, and the finish rolling draught per pass is controlled at 15～40%, and belt steel thickness is 2～14mm after the finish rolling.
4, the speed with 15～60 ℃/s is cooled to 450～600 ℃ after the finish rolling, batches, and obtains the finished product hot rolled strip.
The objective of the invention is on the basis of carbon manganese structure iron composition, by adding microalloy element and controlled rolling and controlled cooling technology, the production yield strength is not less than 800MPa, tensile strength is not less than 890MPa, elongation after fracture is not less than 18%, the structure steel band that has good use properties simultaneously, its metallographic structure are that grain-size is the ferrite of 2～4 μ m, 10～20% bainite and a small amount of pearlitic heterogeneous structure.
Among the present invention steel grades be provided with considered following some: C is effectively to strengthening steel plate, but has reduced its formability and weldability simultaneously, and these performances are absolutely necessary concerning its use properties, so the content of carbon is controlled in the soft steel scope.Mn can effectively improve the performance of steel by solution strengthening and phase transformation strengthening, but can reduce its spot welding ability and throwing power simultaneously, so the content of manganese is controlled at about 2%.Si and P can improve the intensity of steel, but can reduce the throwing power of steel simultaneously, so the control of their content is very low.For on the basis of soft steel, yield strength is brought up to more than the 800MPa, control performance perameters such as strong flexor ratio simultaneously well, it is not enough relying on grain refining merely.After adding alloying element Ti, can produce the precipitation strength effect, the cold forming capability of high strength titanium steel is good simultaneously, and vertically, laterally and the performance homogeneous on the thickness direction, and the adding of titanium also improved the welding property of steel, is very favourable so add titanium.
Adopt the foundation of this TMCP technology to be: by the austenite recrystallization controlled rolling of high-temperature zone, abundant refine austenite crystal grain; The finish rolling finishing temperature is controlled at 760-860 ℃, makes the bigger accumulation strain of generation in the operation of rolling; By rolling fast batching of cooling and mild temperature of back, the heterogeneous structure of a small amount of bainite that obtains distributing on the ferrite matrix of refinement.
The present invention provides a kind of new structural state to the yield strength of 800 MPa grade hot rolled strip, it is different from the ferritic-pearlitic tissue of general low carbon-structural steel and Ultrafine Grained Steel, but with ultra-fine (2～4m) ferrite and a small amount of (10～20%) bainite composition.
Adopt the foundation of this heterogeneous structure to be: the ferrite matrix of super-refinement makes material have higher yield strength, good plasticity, and the low-temperature flexibility of the toughness, particularly material of material is greatly improved simultaneously.Introduce an amount of bainite in the tissue, can effectively improve tensile strength, improve work hardening capacity, reduce yield tensile ratio, make material when improving intensity, also have good formability.
Hot rolled strip of the present invention has following advantage with comparing with the Hi-Stren steel of intensity rank: 1, hot rolled strip of the present invention is owing to have the ferritic structure of refinement, so have good low-temperature flexibility.2, hot rolled strip of the present invention is because only based on microalloy element, do not add the higher Mo of added value, alloying elements such as Ni, Cr, greatly reduce production cost, adopt hot rolled strip of the present invention, per ton reducing cost is no less than 300 yuan, can produce very big economic benefit.
Description of drawings
Fig. 1 is the metallographic structure figure of the hot rolled strip product of the embodiment of the invention 1.
Embodiment
The milling train that adopts in the embodiment of the invention is 1750 hot continuous mills.
Embodiment 1
Press set component smelting molten steel in 150 tons of converters, and continuous casting becomes strand, its composition is C0.08% by weight percentage, Si0.20%, Mn 2.20%, and Nb 0.04%, V0.07%, Ti0.08%, P0.003%, S0.008%, surplus is iron Fe, slab thickness is 230mm.
Strand is heated to 1250 ℃, carries out roughing, the roughing process is 3 passages, and the roughing start rolling temperature is 1170 ℃, and the roughing finishing temperature is 1070 ℃, and obtaining thickness is the intermediate blank of 50mm.
Intermediate blank is carried out finish rolling, and the finish rolling process is 5 passages, and the finish rolling start rolling temperature is 1000 ℃, two to roll temperature be 980 ℃, and three to roll temperature be 920 ℃, and four to roll temperature be 880 ℃, finishing temperature is 860 ℃, and the finish rolling draught per pass is controlled at 15～40%, and belt steel thickness is 14mm after the finish rolling.
With the speed water-cooled to 450 of 15 ℃/s ℃, batch by reeling machine after the finish rolling, obtain the finished product hot rolled strip, the Mechanics Performance Testing result is: yield strength of 800 MPa, tensile strength 890MPa, elongation after fracture 18%, ballistic work 100J/mm
2, the clod wash test (B=35, d=1.5a) qualified.
Embodiment 2
The preparation method of strand and composition are with embodiment 1, and slab thickness is 240mm.
The roughing process is with embodiment 1, and obtaining thickness is the intermediate blank of 45mm.
Intermediate blank is carried out finish rolling, the finish rolling process is 6 passages, the finish rolling start rolling temperature is 960 ℃, two to roll temperature be 940 ℃, and three to roll temperature be 920 ℃, and four to roll temperature be 900 ℃, five to roll temperature be 840 ℃, finishing temperature is 820 ℃, and the finish rolling draught per pass is controlled at 15～40%, and belt steel thickness is 10mm after the finish rolling.
With the speed water-cooled to 550 of 35 ℃/s ℃, batch by reeling machine after the finish rolling, obtain the finished product hot rolled strip, the Mechanics Performance Testing result is: yield strength 810MPa, tensile strength 895MPa, elongation after fracture 18.5%, ballistic work 100J/mm
2, the clod wash test (B=35, d=1.5a) qualified.
Embodiment 3
The preparation method of strand and composition are with embodiment 1, and slab thickness is 250mm.
The roughing process is with embodiment 1, and obtaining thickness is the intermediate blank of 38mm.
Intermediate blank is carried out finish rolling, the finish rolling process is 7 passages, the finish rolling start rolling temperature is 980 ℃, and two to roll temperature be 950 ℃, and three to roll temperature be 930 ℃, four to roll temperature be 890 ℃, five to roll temperature be 850 ℃, and six to roll temperature be 820 ℃, and finishing temperature is 780 ℃, the finish rolling draught per pass is controlled at 15～40%, and belt steel thickness is 6mm after the finish rolling.
With the speed water-cooled to 600 of 60 ℃/s ℃, batch by reeling machine after the finish rolling, obtain the finished product hot rolled strip, the Mechanics Performance Testing result is: yield strength 805MPa, tensile strength 900MPa, elongation after fracture 19%, ballistic work 115J/mm
2, the clod wash test (B=35, d=1.5a) qualified.
Embodiment 4
Press set component smelting molten steel in 150 tons of converters, and continuous casting becomes strand, its composition is ℃ 0.14% by weight percentage, Si0.10%, and Mn 1.70%, and Nb 0.07%, Ti0.18%, P0.007%, S0.005%, surplus is iron Fe, slab thickness is 220mm.
Strand is heated to 1280 ℃, carries out roughing, the roughing process is 4 passages, and the roughing start rolling temperature is 1150 ℃, and finishing temperature is 1000 ℃, and obtaining thickness is the intermediate blank of 48mm.
Intermediate blank is carried out finish rolling, and the finish rolling process is 5 passages, and the finish rolling start rolling temperature is 1000 ℃, two to roll temperature be 970 ℃, and three to roll temperature be 930 ℃, and four to roll temperature be 870 ℃, finishing temperature is 850 ℃, and the finish rolling draught per pass is controlled at 15～40%, and belt steel thickness is 12mm after the finish rolling.
With the speed water-cooled to 450 of 20 ℃/s ℃, batch by reeling machine after the finish rolling, obtain the finished product hot rolled strip, the Mechanics Performance Testing result is: yield strength 810MPa, tensile strength 890MPa, elongation after fracture 19%, ballistic work 110J/mm
2, the clod wash test (B=35, d=1.5a) qualified.
Embodiment 5
The preparation method of strand and composition are with embodiment 4, and slab thickness is 230mm.
The roughing process is with embodiment 4, and obtaining thickness is the intermediate blank of 42mm.
Intermediate blank is carried out finish rolling, the finish rolling process is 6 passages, the finish rolling start rolling temperature is 970 ℃, two to roll temperature be 950 ℃, and three to roll temperature be 920 ℃, and four to roll temperature be 880 ℃, five to roll temperature be 830 ℃, finishing temperature is 806 ℃, and the finish rolling draught per pass is controlled at 15～40%, and belt steel thickness is 10mm after the finish rolling.
With the speed water-cooled to 530 of 30 ℃/s ℃, batch by reeling machine after the finish rolling, obtain the finished product hot rolled strip, the Mechanics Performance Testing result is: yield strength 830MPa, tensile strength 910MPa, elongation after fracture 18%, ballistic work 120J/mm
2, the clod wash test (B=35, d=1.5a) qualified.
Embodiment 6
The preparation method of strand and composition are with embodiment 4, and slab thickness is 240mm.
The roughing process is with embodiment 4, and obtaining thickness is the intermediate blank of 38mm.
Intermediate blank is carried out finish rolling, and the finish rolling process is 5 passages, and the finish rolling start rolling temperature is 950 ℃, two to roll temperature be 910 ℃, and three to roll temperature be 880 ℃, and four to roll temperature be 820 ℃, finishing temperature is 760 ℃, and the finish rolling draught per pass is controlled at 15～40%, and belt steel thickness is 8mm after the finish rolling.
With the speed water-cooled to 600 of 40 ℃/s ℃, batch by reeling machine after the finish rolling, obtain the finished product hot rolled strip, the Mechanics Performance Testing result is: yield strength 810MPa, tensile strength 900MPa, elongation after fracture 18.5%, ballistic work 124J/mm
2, the clod wash test (B=35, d=1.5a) qualified.
Embodiment 7
Press set component smelting molten steel in 150 tons of converters, and continuous casting becomes strand, its composition is ℃ 0.12% by weight percentage, Si0.01%, Mn 1.90%, and Nb 0.05%, V0.04%, Ti0.12%, P0.003%, S0.006%, surplus is iron Fe, slab thickness is 240mm.
Strand is heated to 1220 ℃, carries out roughing, the roughing process is 5 passages, and the roughing start rolling temperature is 1120 ℃, and finishing temperature is 980 ℃, and obtaining thickness is the intermediate blank of 42mm.
Intermediate blank is carried out finish rolling, the finish rolling process is 7 passages, the finish rolling start rolling temperature is 1000 ℃, and two to roll temperature be 970 ℃, and three to roll temperature be 940 ℃, four to roll temperature be 900 ℃, five to roll temperature be 860 ℃, and six to roll temperature be 820 ℃, and finishing temperature is 790 ℃, the finish rolling draught per pass is controlled at 15～40%, and belt steel thickness is 2mm after the finish rolling.
With the speed water-cooled to 600 of 50 ℃/s ℃, batch by reeling machine after the finish rolling, obtain the finished product hot rolled strip, the Mechanics Performance Testing result is: yield strength 810MPa, tensile strength 910MPa, elongation after fracture 19%, ballistic work 113J/mm
2, the clod wash test (B=35, d=1.5a) qualified.
Embodiment 8
The preparation method of strand and composition are with embodiment 4, and slab thickness is 240mm.
The roughing process is with embodiment 4, and obtaining thickness is the intermediate blank of 40mm.
Intermediate blank is carried out finish rolling, and the finish rolling process is 5 passages, and the finish rolling start rolling temperature is 950 ℃, two to roll temperature be 920 ℃, and three to roll temperature be 880 ℃, and four to roll temperature be 860 ℃, finishing temperature is 820 ℃, and the finish rolling draught per pass is controlled at 15～40%, and belt steel thickness is 10mm after the finish rolling.
With the speed water-cooled to 550 of 60 ℃/s ℃, batch by reeling machine after the finish rolling, obtain the finished product hot rolled strip, the Mechanics Performance Testing result is: yield strength 825MPa, tensile strength 920MPa, elongation after fracture 19%, ballistic work 110J/mm
2, the clod wash test (B=35, d=1.5a) qualified.
Embodiment 9
The preparation method of strand and composition are with embodiment 4, and slab thickness is 240mm.
The roughing process is with embodiment 4, and obtaining thickness is the intermediate blank of 38mm.
Intermediate blank is carried out finish rolling, the finish rolling process is 6 passages, the finish rolling start rolling temperature is 950 ℃, two to roll temperature be 920 ℃, and three to roll temperature be 880 ℃, and four to roll temperature be 860 ℃, five to roll temperature be 820 ℃, finishing temperature is 800 ℃, and the finish rolling draught per pass is controlled at 15～40%, and belt steel thickness is 6mm after the finish rolling.
With the speed water-cooled to 450 of 40 ℃/s ℃, batch by reeling machine after the finish rolling, obtain the finished product hot rolled strip, the Mechanics Performance Testing result is: yield strength 840MPa, tensile strength 940MPa, elongation after fracture 18%, ballistic work 114J/mm
2, the clod wash test (B=35, d=1.5a) qualified.
Claims (2)
1. a yield strength is higher than the hot rolled strip of 800MPa, it is characterized in that: the composition of this hot rolled strip is C0.08～0.14% by weight percentage, and Si 0.01～0.20%, and Mn 1.70～2.20%, Nb 0.04～0.07%, V0.00～0.07%, Ti0.08～0.18%, P＜0.01%, S＜0.01%, surplus is iron Fe, and its metallographic structure is that grain-size is the ferrite of 2～4 μ m, 10～20% bainite and a small amount of pearlitic heterogeneous structure; This hot rolled strip yield strength is more than or equal to 800MPa, and tensile strength is more than or equal to 890MPa, and elongation after fracture is more than or equal to 18%.
2. the described a kind of yield strength of claim 1 is higher than the preparation method of the hot rolled strip of 800MPa, it is characterized in that carrying out according to the following steps: (1) is by the set component smelting molten steel and cast strand, and its composition is C0.08～0.14% by weight percentage, and Si 0.01～0.20%, Mn 1.70～2.20%, Nb 0.04～0.07%, V0.00～0.07%, Ti0.08～0.18%, P＜0.01%, S＜0.01%, surplus are iron Fe, and slab thickness is 220～250mm; (2) strand is heated to 1220～1280 ℃, carries out roughing, the roughing process is 3～5 passages, and the roughing start rolling temperature is 1120～1170 ℃, and the roughing finishing temperature is 980～1070 ℃, and obtaining thickness is the intermediate blank of 38～50mm; (3) intermediate blank is carried out finish rolling, the finish rolling process is 5～7 passages, and the finish rolling start rolling temperature is 950～1000 ℃, and the finish rolling finishing temperature is 760～860 ℃, and the finish rolling draught per pass is controlled at 15～40%, and belt steel thickness is 2～14mm after the finish rolling; (4) speed with 15～60 ℃/s is cooled to 450～600 ℃ after the finish rolling, batches, and obtains the finished product hot rolled strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100117423A CN101560629B (en) | 2009-05-27 | 2009-05-27 | Hot rolling strip steel having yield strength being higher than 800MPa and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100117423A CN101560629B (en) | 2009-05-27 | 2009-05-27 | Hot rolling strip steel having yield strength being higher than 800MPa and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101560629A CN101560629A (en) | 2009-10-21 |
| CN101560629B true CN101560629B (en) | 2010-12-29 |
Family
ID=41219599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100117423A Expired - Fee Related CN101560629B (en) | 2009-05-27 | 2009-05-27 | Hot rolling strip steel having yield strength being higher than 800MPa and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101560629B (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101856669B (en) * | 2010-06-02 | 2012-01-04 | 东北大学 | Control method of softness of oxide scales on surface of hot-rolling strip steel |
| JP5029749B2 (en) * | 2010-09-17 | 2012-09-19 | Ｊｆｅスチール株式会社 | High-strength hot-rolled steel sheet excellent in bending workability and its manufacturing method |
| CN102899581B (en) * | 2012-10-29 | 2015-09-02 | 莱芜钢铁集团有限公司 | A kind of CT80 cascade steel for continuous oil pipe material |
| CN102943204A (en) * | 2012-11-28 | 2013-02-27 | 东北大学 | Yield strength 1100MPa level engineering machinery non-quenched and tempered hot rolled strip and preparation method thereof |
| JP5672421B1 (en) * | 2013-04-15 | 2015-02-18 | Ｊｆｅスチール株式会社 | High strength hot rolled steel sheet and method for producing the same |
| CN104831167B (en) * | 2015-04-28 | 2016-08-24 | 河北钢铁股份有限公司承德分公司 | A kind of high-strength steel hot-rolled sheet coil of Q550E and production method thereof |
| CN105728459B (en) * | 2016-03-02 | 2017-12-26 | 湖南湘投金天钛金属有限公司 | A kind of method of conventional hot continuous rolling machine unit production TA18 Ti Alloy Strip volumes |
| CN106756563A (en) * | 2017-01-10 | 2017-05-31 | 河钢股份有限公司承德分公司 | Tensile strength 800MPa grades of Ultra-thin broad hot strip and production method |
| CN106756564A (en) * | 2017-01-12 | 2017-05-31 | 唐山钢铁集团有限责任公司 | A kind of yield strength 700MPa grades of steel band and its production method |
| CN111041379A (en) * | 2019-12-30 | 2020-04-21 | 河钢股份有限公司承德分公司 | Nb-V-Ti composite reinforced high-strength wear-resistant tank steel plate and production method thereof |
| CN112080693B (en) * | 2020-08-26 | 2021-04-13 | 盐城市联鑫钢铁有限公司 | Titanium micro-alloyed anti-seismic steel bar and preparation method thereof |
| CN112517639A (en) * | 2020-10-20 | 2021-03-19 | 包头钢铁（集团）有限责任公司 | Manufacturing method of 450MPa Nb-containing high-strength alloy steel |
| CN113564456B (en) * | 2021-06-23 | 2022-04-01 | 武汉钢铁有限公司 | Hot rolling manufacturing method of high-strength steel |
| CN114345938B (en) * | 2022-01-04 | 2024-02-09 | 湖南华菱涟源钢铁有限公司 | Method for producing high-strength steel with yield strength of 700MPa level based on short process and low cost |
-
2009
- 2009-05-27 CN CN2009100117423A patent/CN101560629B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101560629A (en) | 2009-10-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101560629B (en) | Hot rolling strip steel having yield strength being higher than 800MPa and preparation method thereof | |
| CN105839003B (en) | A kind of 180~200mm thickness EH36 steel plates of normalizing state delivery and preparation method thereof | |
| CN101805873B (en) | Low-cost and high-strength steel for automobile crossbeam and manufacturing method thereof | |
| CN101624676B (en) | Hot-rolled beam steel with a tensile strength of more than 710MPa and preparation method thereof | |
| CN101701316B (en) | Automobile beam steel with tensile strength of 590MPa and manufacturing method thereof | |
| CN100419109C (en) | Manufacturing method of low carbon 700 MPa composite fertified ultrafine crystal band steel | |
| CN102703824A (en) | Non hardened and tempered state hot-rolled steel strip with yield strength higher than 900MPa and preparation method thereof | |
| CN108070779A (en) | A kind of solderable fine grain, high strength degree structural steel and iron and its production method | |
| CN102418033B (en) | Heat-treatment-free high-strength cold heading steel and production method for hot rolled bar of heat-treatment-free high-strength cold heading steel | |
| CN107604248B (en) | A kind of high intensity Q500GJD quenched and tempered state steel plate for building structure and its manufacturing method | |
| CN104018064B (en) | The production method of low cost Q345R steel plate | |
| CN107299279A (en) | A kind of 100mm thickness 410HB grade wear-resisting steel plates and preparation method thereof | |
| CN109722601A (en) | A kind of production method of the super-thick steel plate Q420E of low-carbon-equivalent | |
| CN107723604A (en) | A kind of economical 690MPa levels dual phase steel and preparation method thereof | |
| CN109355567A (en) | A kind of low cost Q390D steel plate and preparation method thereof | |
| CN106435384A (en) | Vanadium-containing automobile structural steel and production method thereof | |
| CN108517465A (en) | A kind of niobium titanium chromium-boron alloy abrasion-resistant stee and preparation method thereof | |
| CN103014520A (en) | F+P+B type low-yield-ratio and high-strength medium steel plate and production method thereof | |
| CN102943205A (en) | Ferrite/bainite hot-rolled dual-phase steel with tensile strength level of 580MPa and preparation method thereof | |
| CN102191430A (en) | Easy welding steel plate with yield strength of 550MPa and high toughness and manufacturing method thereof | |
| CN102418047B (en) | Non-quenched and tempered fatigue-resistant steel plate and manufacturing method thereof | |
| CN102943204A (en) | Yield strength 1100MPa level engineering machinery non-quenched and tempered hot rolled strip and preparation method thereof | |
| CN103447295B (en) | Manufacturing method of hot rolled steel plate with low alloy structural steel | |
| CN101831587A (en) | 600 MPa-grade hot rolled steel plate and manufacturing method thereof | |
| CN101397625B (en) | Superfine grain steel sheet with yield strength of 420 MPa grade and method for producing the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101229 Termination date: 20120527 |