CN100368582C - Production method of ultra-low carbon bainite steel - Google Patents
Production method of ultra-low carbon bainite steel Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 229910001563 bainite Inorganic materials 0.000 title claims abstract description 32
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 238000005096 rolling process Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 238000001953 recrystallisation Methods 0.000 claims abstract description 8
- 238000005516 engineering process Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 13
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 6
- 229910052719 titanium Inorganic materials 0.000 abstract description 6
- 229910052796 boron Inorganic materials 0.000 abstract description 5
- 229910052804 chromium Inorganic materials 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 229910052748 manganese Inorganic materials 0.000 abstract description 4
- 229910052759 nickel Inorganic materials 0.000 abstract description 3
- 229910052758 niobium Inorganic materials 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 229910052710 silicon Inorganic materials 0.000 abstract description 2
- 238000005452 bending Methods 0.000 abstract 1
- 238000005065 mining Methods 0.000 abstract 1
- 239000004615 ingredient Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 239000011572 manganese Substances 0.000 description 8
- 239000010949 copper Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 239000010955 niobium Substances 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 238000005275 alloying Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910018559 Ni—Nb Inorganic materials 0.000 description 1
- 229910008455 Si—Ca Inorganic materials 0.000 description 1
- 241001515806 Stictis Species 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- FZQBLSFKFKIKJI-UHFFFAOYSA-N boron copper Chemical compound [B].[Cu] FZQBLSFKFKIKJI-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
The invention discloses a production method of ultra-low carbon bainite steel, which comprises the following chemical components (Wt%): 0.019 to 0.05 percent of C, 0.05 to 0.5 percent of Si, 1.74 to 2.2 percent of Mn, 0.015 to 0.070 percent of Nb, 0.005 to 0.03 percent of Ti, 0.0005 to 0.005 percent of B, 0.015 to 0.07 percent of Al, 0.21 to 0.5 percent of Mo, 0.26 to 1.8 percent of Cu, 0.23 to 1.0 percent of Ni, 0.0 to 0.70 percent of Cr, and the balance of Fe and inevitable impurity elements, and a controlled rolling and controlled cooling technology is adopted. The heating maximum temperature of the billet before rolling is 1100-1220 ℃, the two-stage controlled rolling of recrystallization and non-recrystallization is adopted, the intermittent cooling mode is adopted after rolling, and the optimal final cooling temperature is 450-630 ℃. The steel produced by the method has the advantages of toughness and brittleness turning temperature below-80 ℃, excellent cold bending forming performance, simple process and low cost. The method is widely applied to the fields of engineering machinery, mining machinery, heavy-duty automobiles, pipelines, containers, bridges, ships, containers, marine facilities and the like.
Description
Technical field
The invention belongs to metal material field, particularly a kind of production method of ultra-low-carbon bainite steel.
Background technology
Ultra-low-carbon bainite steel is the new steel system that development in recent years high strength, high tenacity, the welding property of getting up is good in the world, is sung the praises of in the world to be the 21 century steel grade, and it is the product that modern metallurgical production technology combines with the Physical Metallurgy achievement.Cr in the ultra-low-carbon bainite steel of early development, Ni constituent content are higher, and the cost height is produced relatively difficulty.For example, the patent (TW258757, contriver JANG J etc.) of steel connection application " having the good weldability and the low manganese of erosion resistance is the production technique of ultra-low-carbon bainite steel (ULCB) " is used Mo-Ni-Nb system and is obtained ultra-low-carbon bainite steel in the Taiwan.Its weak point is that Mn content is low, and alloy adding such as Mo, Ni are big, and the cost of steel is risen, and undesirable to the bainite transformation effect that promotes whole tissues, thereby the intensity rank level of steel is not high, does not form tandem product.
For another example: in the research paper that U.S. Bcthlchcm Steel delivers about ultra-low-carbon bainite steel, the weak point of the chemical ingredients of relevant ultra-low-carbon bainite steel is the content height (Cr2.23% of its noble element Cr, Mo, Mo2.35%), cause the cost of steel to improve greatly, and too high Cr, Mo will cause temper crack, the toughness of reduction steel.In the paper of C.I.Garcia about yield strength greater than 690N/mm
2The chemical ingredients of ultra-low-carbon bainite steel, also have similar problem, its Mo element is up to 3.05%, the Ni element is up to 3.63%.Same not according to market requirement situation formation tandem product.
The twentieth century end, wuhan iron ﹠ steel croup co. company has applied for that publication number is a kind of " copper boron is low-carbon (LC) and ULCB high-strength steel " patent of CN1218115A, think to be difficult to carbon content is controlled between 0.02～0.05% in producing, so carbon content is brought up to 0.08%; Say on the stricti jurise that this steel grade can not be thought the ultra-low-carbon bainite steel category.Same not according to market requirement situation formation tandem product.
Summary of the invention
In order to overcome the deficiencies in the prior art, the present invention is from reducing cost, and the angle of meeting the need of market is set out, and it is 420N/mm that yield strength is provided
2, 460N/mm
2, 500N/mm
2, 550N/mm
2, 620N/mm
2, 690N/mm
2The ultra-low-carbon bainite steel of six intensity ranks.It is characterized in that, C content is below 0.05% in the steel, with Mn element with low cost as principal element, with elements such as Mn, Mo, Cu, Nb, Ti, B to the abundant combined utilization of the effect of bainite transformation, with Cr, Ni as auxiliary element, and combine, thereby realize other ultra-low-carbon bainite steel of different intensity scale with rational controlled rolling and controlled cooling production technique.Its main chemical compositions content (Wt%) is: C0.01%～0.05%, Si0.05%～0.5%, Mn1.0%～2.2%, Nb0.015%～0.070%, Ti0.005%～0.03%, B0.0005%～0.005%, Mo0.0%～0.5%, Cu0.0%～1.8%, Ni0.0%～1.0%, Cr0.0～0.7%, Al0.015%～0.07%, all the other are Fe and unavoidable impurities.
The main effect of alloying element in serial ultra-low-carbon bainite steel that the present invention selects is:
C: carbon is very big to intensity, toughness, the welding property influence of steel.C content is lower than at 0.01% o'clock can not form enough NbC that plays an important role in the controlled rolling operation, be difficult to obtain high strength, also cause the toughness of steel to reduce greatly, and welded heat affecting zone is softening; Carbon is higher than at 0.05% o'clock, and bainite structure reduces in generating tissue, and intensity, unit elongation and toughness are descended.
Mn: manganese is to improve intensity and flexible effective element, and bainite transformation is had bigger promoter action, and effect is more remarkable under the Ultra-low carbon condition, and cost is very cheap, therefore in the present invention the Mn element as main alloy element.
B: boron is the composition of outbalance in the ultra-low-carbon bainite steel, and it can improve the hardening capacity of steel, particularly adds the boron of trace in ultra low-carbon steel, can suppress austenite effectively to ferrite, pearlitic transformation.
Nb: niobium is the important element in the rolling controlled and cooling controlled steel, it is the austenitic recrystallize of delayed deformation effectively, stop austenite crystal to be grown up, improve austenite recrystallization temperature, crystal grain thinning improves intensity and toughness simultaneously, it and micro-boron compound action, can improve hardening capacity significantly, promote bainite transformation.
Ti: adding the titanium of trace, is for the nitrogen element in the fixing steel, thereby guarantees the raising hardening capacity effect of boron.In the best condition, titanium, nitrogen form titanium nitride, stop steel billet the growing up of crystal grain in heating, rolling, welding process, improve the toughness of mother metal and welded heat affecting zone.Titanium is lower than at 0.005% o'clock, and nitrogen fixation effect is poor, surpasses at 0.03% o'clock, and nitrogen fixation effect reaches capacity, and superfluous titanium will make the toughness of steel worsen.
Si: silicon is the bioelement of deoxidation in steel making, also has certain strengthening effect, when content is lower than 0.05%, is difficult to obtain sufficient deoxidation effect; Content surpasses at 0.5% o'clock, and the degree of cleaning of steel descend, and toughness reduces, and weldability is poor.
Al: aluminium is deoxidant element, can be used as the AlN forming element, crystal grain thinning effectively, and when it contained quantity not sufficient 0.01%, effect was less; Surpass at 0.07% o'clock, desoxydatoin reaches capacity; High more then harmful to mother metal and welding heat influence area toughness.
Mo: molybdenum helps the refinement of austenite crystal when rolling and the generation of fine bainite, and when content surpassed 0.5%, cost improved, and weldability reduces.
Cu:, except gaining in strength, also help and obtain good low-temperature flexibility and solidity to corrosion as alloying element.In yield strength greater than 550N/mm
2Ultra-low-carbon bainite steel in add Cu, can utilize the comprehensive action of Cu-B further to improve the hardening capacity of steel, promote the formation of bainite.
Ni: the purpose of adding the Ni element in the present invention mainly is to stop to contain the tendency that the high steel billet of Cu amount cracks when heating or hot rolling, considers economy, in the present invention Ni content is controlled at below 1.0%.
Cr: different according to intensity rank and steel plate thickness, add proper C r element, improving the intensity of steel, but this element also is a noble element, considers from economy and weldability, in the present invention Cr content is controlled at below 0.70%.
The upper limit of the impurity element in the steel is controlled at P≤0.02%, S≤0.01%, and N≤0.006% is advisable.
In the present invention, can be different different with steel plate thickness according to intensity rank, suitably determine to add the kind and the content of element.Intensity rank and alloying constituent coupling are:
Yield strength is greater than 420N/mm
2Rank adopts chemical ingredients scope (Wt%) to be: C0.01%～0.05%, Si0.05%～0.5%, Mn1.0%～1.8%, Nb0.015%～0.07%, Ti0.005%～0.03%, B0.0005%～0.005%, Al0.015%～0.07%, all the other are Fe and unavoidable impurities element;
Yield strength is greater than 460N/mm
2Rank adopts chemical ingredients scope (Wt%) to be: C0.01%～0.05%, Si0.05%～0.5%, Mn1.2%～2.0%, Nb0.015%～0.07%, Ti0.005%～0.03%, B0.0005%～0.005%, Al0.015%～0.07%, all the other are Fe and unavoidable impurities element;
Yield strength is greater than 500N/mm
2Rank adopts chemical ingredients scope (Wt%) to be: C0.01%～0.05%, Si0.05%～0.5%, Mn1.2%～2.0%, Nb0.015%～0.07%, Ti0.005%～0.03%, B0.0005%～0.005%, Al0.015%～0.07%, Mo0.1%～0.5%, all the other are Fe and unavoidable impurities element;
Yield strength is greater than 550N/mm
2Rank adopts chemical ingredients scope (Wt%) to be: C0.01%～0.05%, Si0.05%～0.5%, Mn1.2%～2.0%, Nb0.015%～0.07%, Ti0.005%～0.03%, B0.0005%～0.005%, Al0.015%～0.07%, Mo0.1%～0.5%, Cu0.1%～1.0%, Ni0.1%～0.6%, all the other are Fe and unavoidable impurities element;
Yield strength is greater than 620N/mm
2Rank adopts chemical ingredients scope (Wt%) to be: C0.01%～0.05%, Si0.05%～0.5%, Mn1.2%～2.2%, Nb0.015%～0.07%, Ti0.005%～0.03%, B0.0005%～0.005%, Al0.015%～0.07%, Mo0.1%～0.5%, Cu0.2%～1.5%, Ni0.1%～0.8%, all the other are Fe and unavoidable impurities element;
Yield strength is greater than 690N/mm
2Rank adopts chemical ingredients scope (Wt%) to be: C0.01%～0.05%, Si0.05%～0.5%, Mn1.2%～2.2%, Nb0.015%～0.070%, Ti0.005%～0.03%, B0.0005%～0.005%, Al0.015%～0.07%, Mo0.1%～0.5%, Cu0.3%～1.8%, Ni0.1%～1.0%, Cr0.0%～0.70%, all the other are Fe and unavoidable impurities element.
Realize that the present invention takes following technical measures on production technique:
Aspect smelting technology, adopt converter smelting, the dark decarburization of top blast or top bottom blowing; Adopt the further decarburization of RH vacuum-treat, and carry out microalloying; Ca handles, and in conjunction with S content and tap in the steel, feeds the Si-Ca line.
Aspect rolling technology, adopt controlled rolling and controlled cooling technology.Steel billet heating top temperature so that can there be the Nb of a great deal of to dissolve in austenite, helps rolling the formation of bainite in the postcooling process at 1100 ℃～1220 ℃ before rolling.Adopting recrystallize and non-recrystallization two stages controlled rolling, the recrystallization zone rolling temperature is controlled at 〉=and 1000 ℃; Non-recrystallization district rolling temperature is controlled at 950 ℃～Ar3+ (0 ℃～80 ℃), and the accumulation of distortion amount is greater than 50%; Roll the back and adopt the intermittently type of cooling, can be immediately after the finish to gauge with 1 ℃/S～25 ℃/S speed of cooling cooling 0S～10S, carry out air cooling 2S～30S again, adopt to concentrate the type of cooling to be quickly cooled to following 0 ℃～150 ℃ of target final cooling temperature Bs point then with 1 ℃/S～40 ℃/S speed of cooling.According to the chemical ingredients of above-mentioned each intensity rank, best termination cooling temperature is 450 ℃～630 ℃.When the Cu constituent content surpasses 0.4%, need carry out temper, so that separating out, the Cu precipitation generates ε-Cu, further improve intensity and toughness.Tempering temperature is controlled at 480 ℃～650 ℃.
Yield strength provided by the invention is 420N/mm
2, 460N/mm
2, 500N/mm
2, 550N/mm
2, 620N/mm
2, 690N/mm
2The ultra-low-carbon bainite steel of six intensity ranks, compare with prior art and to have following advantage:
Steel grade intensity high and low temperature good toughness of the present invention, ductile-brittle transition temperature are below-80 ℃, and 180 ° of d=0 of clod wash do not ftracture yet, and winter hardiness is strong, and over-all properties is stable;
Steel grade carbon content of the present invention is low, and welding property is good, does not need preheating before the weldering, and postwelding does not need thermal treatment, can simplify weldprocedure;
The valuable alloying element content of steel grade of the present invention is few, and is with low cost;
Steel grade production technique of the present invention is simple, stable, workable; Smelter of certain scale can both be implemented;
The present invention has realized the seriation of ultra-low-carbon bainite steel intensity rank, can fully satisfy requirements of different users, can be widely used in engineering machinery, excavates machinery, field such as heavy-duty car, pipeline, container, the bridge of boats, boats and ships, freight container and maritime facilities.
Embodiment
According to prescription provided by the invention and production technique, having made yield strength is 420N/mm
2, 460N/mm
2, 500N/mm
2, 550N/mm
2, 620N/mm
2, 690N/mm
2Six other ultra-low-carbon bainite steels of level, concrete chemical ingredients is listed table 1 in, and the object performance assay is listed table 2 in.
Table 1, embodiment of the invention chemical ingredients (Wt%)
| Embodiment | Intensity rank | C | Si | Mn | P | S | Nb | Ti | B | Als | Mo | Cu | Ni | Cr |
| 1 | 420N/mm 2 | 0.034 | 0.17 | 1.59 | 0.015 | 0.008 | 0.040 | 0.010 | 0.0008 | 0.025 | ||||
| 2 | 460N/mm 2 | 0.040 | 0.18 | 1.71 | 0.014 | 0.007 | 0.043 | 0.020 | 0.0016 | 0.021 | ||||
| 3 | 500N/mm 2 | 0.025 | 0.22 | 1.72 | 0.008 | 0.004 | 0.050 | 0.011 | 0.0012 | 0.029 | 0.18 | |||
| 4 | 550N/mm 2 | 0.037 | 0.19 | 1.74 | 0.012 | 0.005 | 0.054 | 0.021 | 0.0017 | 0.040 | 0.21 | 0.26 | 0.23 | |
| 5 | 620N/mm 2 | 0.034 | 0.20 | 1.81 | 0.010 | 0.005 | 0.048 | 0.018 | 0.0013 | 0.038 | 0.23 | 0.57 | 0.34 | |
| 6 | 690N/mm 2 | 0.019 | 0.25 | 2.03 | 0.010 | 0.005 | 0.046 | 0.019 | 0.0012 | 0.031 | 0.27 | 0.70 | 0.32 | 0.31 |
The object performance of table 2, the embodiment of the invention
| Embodiment | Intensity rank | Steel plate thickness | Rel | Rm | A | Akv, (J) (three 5 * 10 * 55 sample means) | Clod wash | ||||
| mm | N/mm 2 | N/mm 2 | ％ | 0℃ | -20℃ | -40℃ | -60℃ | -80℃ | 180° | ||
| 1 | 420N/mm 2 | 5 | 455 | 570 | 23 | 93 | 92 | 93 | 92 | 90 | d＝0 |
| 2 | 460N/mm 2 | 6 | 495 | 615 | 22 | 109 | 98 | 94 | 90 | 92 | d＝0 |
| 3 | 500N/mm 2 | 8 | 545 | 700 | 22 | 94 | 94 | 92 | 90 | 87 | d＝0 |
| 4 | 550N/mm 2 | 8 | 605 | 750 | 20 | 96 | 93 | 87 | 96 | 89 | d＝0 |
| 5 | 620N/mm 2 | 10 | 670 | 780 | 17 | 95 | 90 | 88 | 82 | 84 | d＝0 |
| 6 | 690N/mm 2 | 10 | 790 | 890 | 17 | 115 | 100 | 98 | d＝0 | ||
Claims (4)
1. the production method of a ultra-low-carbon bainite steel, it is characterized in that, its alloy content Wt% is: C0.019%～0.05%, Si0.05%～0.5%, Mn1.74%～2.2%, Nb0.015%～0.070%, Ti0.005%～0.03%, B0.0005%～0.005%, Al0.015%～0.07%, Mo0.21%～0.5%, Cu0.26%～1.8%, Ni0.23%～1.0%, Cr0.0%～0.7%, all the other are Fe and unavoidable impurities element, and the steel of above-mentioned composition adopts vacuum-treat in smelting process, adopt controlled rolling and technology for controlled cooling when rolling, the rolling of steel carried out according to recrystallize and two stages of non-recrystallization, recrystallize stage rolling temperature is greater than 1000 ℃, and non-recrystallization stage rolling upper temperature limit is controlled at 920～980 ℃, and lower limit is controlled at Ar
3+ (0 ℃～80 ℃), the intermittently type of cooling is adopted in rolling back, after the finish to gauge immediately with 1 ℃/S～25 ℃/S speed of cooling cooling 0S～10S, carry out air cooling 2S～30S again, adopt concentrating the type of cooling to be quickly cooled to the target final cooling temperature with 1 ℃/S～40 ℃/S speed of cooling then is following 0 ℃～150 ℃ of Bs point.
2. the production method of ultra-low-carbon bainite steel according to claim 1 is characterized in that yield strength 〉=550N/mm
2The time, Mn1.74%～2.0% wherein, Cu0.26%～1.0%, Ni0.23%～0.6%, Mo0.21%～0.5%.
3. the production method of ultra-low-carbon bainite steel according to claim 1 is characterized in that yield strength 〉=620N/mm
2The time, Mn1.81%～2.2% wherein, Cu0.57%～1.5%, Mo0.23%～0.5%, Ni0.34%～0.8%.
4. the production method of ultra-low-carbon bainite steel according to claim 1 is characterized in that yield strength 〉=690N/mm
2The time, Mn2.03%～2.2% wherein, Cu0.7%～1.8%, Mo0.27%～0.5%, Ni0.32%～1.0%, Cr0.31%～0.70%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100343408C (en) * | 2004-12-08 | 2007-10-17 | 鞍钢股份有限公司 | Bainite steel with high tensile strength, high toughness and low yield ratio and production method thereof |
| CN100350065C (en) * | 2004-12-08 | 2007-11-21 | 鞍钢股份有限公司 | High tensile strength low carbon bainite thick steel plate and production method thereof |
| CN100350066C (en) * | 2004-12-08 | 2007-11-21 | 鞍钢股份有限公司 | High-strength high-toughness low-carbon bainite thick steel plate and production method thereof |
| CN100463995C (en) * | 2005-12-12 | 2009-02-25 | 鞍钢股份有限公司 | Tungsten series low-carbon bainite steel and production method thereof |
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