CN101353759A - Low crack sensitivity steel plate having 550Mpa grade of yield strength and manufacturing method thereof - Google Patents
Low crack sensitivity steel plate having 550Mpa grade of yield strength and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides a low crackle sensitive steel sheet with the yield strength level of 550MPa and a preparation method thereof. The low crackle sensitive steel sheet comprises the following chemical composition: C: 0.005 to 0.04 weight percent, Si: 0.40 to 0.70 weight percent, Mn: 1.40 to 1.85 weight percent, Cr: less than or equal to 0.20 weight percent, Mo: less than or equal to 0.20 weight percent, Cu: less than or equal to 0.30 weight percent, Ni: less than or equal to 0.20 weight percent, Nb: 0.04 to 0.08 weight percent, Al: 0.02 to 0.06 weight percent, Ti: 0.004 to 0.030 weight percent, B: 0.0005 to 0.0020 weight percent, and the rest are Fe and inevitable impurities, with Pcm being less than or equal to 0.20 percent. By controlling heat mechanical rolling and cooling technology, a matrix tissue mainly made from refined bainite is obtained, thus being beneficial to the improvement of the strength, plasticity and tenacity of the steel sheet. The yield strength of the low crackle sensitive steel sheet is more than 550MPa, the tensile strength is more than 670MPa, Charpy impact power Akv (minus 20 DEG C) is more than or equal to 150J, 50 percent fracture-appearance transition temperature (FATT) is lower than minus 60 DEG C, and the plate can be 80mm thick and has excellent weldability.
Description
Technical field
The present invention relates to High Strength Structural Steel, specifically, the present invention relates to the low-crackle sensitive steel of yield strength 550MPa level.
Background technology
For physical construction and the employed high-strength steel of engineering construction, for the ease of welding with simplify weldprocedure, wish that the welding crack sensibility indices P cm of steel is low as far as possible, to reach the purpose that need not preheating before the weldering, this steel is called as the low-welding crack-sensitive high-strength steel, also claims CF steel.It is a class have superior weldability can and the Hi-Stren steel of low-temperature flexibility, not preheating or preheating and not cracking a little mainly were the welding procedure problems that has solved large-scale steel structure members before its advantage was to weld, the Pcm of general requirement steel≤0.20%.
The only resource that reduces Pcm is exactly the add-on that reduces carbon and alloying element, and for the high-strength steel that adopts quenching+tempering process to produce, reduce the add-on of carbon and alloying element and will bring the reduction of hardness of steel inevitably, if adopt hot mechanical controlled rolling and controlled cooling technology (TMCP), then can remedy this defective, in addition, with respect to modified (quenching+tempering) technology, hot mechanical controlled rolling and controlled cooling technology (TMCP) thus also have the benefit that crystal grain thinning improves the low-temperature flexibility of steel.
At present, adopting the alloying constituent of the low welding crack sensitivity steel of TMCP technology production generally is Mn-Mo-Nb-Cu-Ni-V-B system or Mn-Mo-Nb-Cu-Ni-B system.Open communique CN1396294 discloses a kind of low-welding crack-sensitive high-strength steel as Chinese patent, its chemical ingredients is: two or more in C:0.02～0.13%, Mn:0.60～1.80%, Si:0.10～0.60%, Ti:0.005～0.025%, Al≤0.01%, Ti:0.005～0.025%, N:0.0020～0.0060%, B:0.0005～0.0020%, Nb:0.008～0.040% and Ni≤0.55%, V≤0.10%, Cu≤0.65%, Mo≤0.50%, Zr≤0.040%, RE≤0.020%, Pcm=0.33%; And for example the open communique CN1932063A of Chinese patent relates to the chemical ingredients of steel grade and is: C:0.06～0.09%, Si:0.15～0.55%, Mn:1.00～1.60%, P≤0.015%, S≤0.006%, Ni:0.15～0.40%, Cr≤0.30%, Mo≤0.30%, Cu≤0.30%, V:0.02～0.06%, Nb:0.005～0.05%, Als:0.010～0.040%, Pcm=0.25%.
The alloying element design of above-mentioned disclosed two kinds of steel grades is respectively Mn-Mo-Cu-Ni-Nb-V-B system and Mn-Mo-Cr-Cu-Ni-Nb-V-B system, because Mo and Ni are valuable alloy, therefore analyze from the kind of the alloying element that adds and the total amount of adding, these two kinds of steel grade smelting cost are higher, and require respectively steel plate to be quenched+tempering and temper manufacturing process's complexity.
In order to overcome the above problems, it is steel grade that the present inventor adopts Mn-Nb-Cr-Mo-Cu-Ni-Ti, by control thermo-mechanical rolling and cooling technology, and need not thermal treatment, designed the low-crackle sensitive steel that a kind of yield strength reaches the 550MPa level, this steel plate has good low-temperature flexibility and weldability.
One object of the present invention is to provide a kind of low crack sensitivity steel plate having 550 Mpa grade of yield strength.
Another object of the present invention is to provide the manufacture method of described low-crackle sensitive steel.
Summary of the invention
First aspect of the present invention provides a kind of low crack sensitivity steel plate having 550 Mpa grade of yield strength, the chemical ingredients of this steel plate comprises: C:0.005～0.04wt%, Si:0.40～0.70wt%, Mn:1.40～1.85wt%, Cr≤0.20wt%, Mo≤0.20wt%, Cu≤0.30wt%, Ni≤0.20wt%, Nb:0.04～0.08wt%, Al:0.02～0.06wt%, Ti:0.004～0.030wt%, B:0.0005～0.0020wt%, surplus is Fe and unavoidable impurities, and satisfies welding crack sensibility indices P cm≤0.20%.
The welding crack sensibility indices P cm of low-crackle sensitive steel can determine by following formula:
Pcm＝C+Si/30+Ni/60+(Mn+Cr+Cu)/20+Mo/15+V/10+5B。
Welding crack sensibility indices P cm is the judgement index of the welding cold cracking tendency of reflection steel, and Pcm is low more, and weldability is good more, otherwise then weldability is poor more.Be difficult for when weldability is meant welding well producing welding crack, and the steel of weldability difference is easy to generate crackle, for fear of the generation of crackle, must before welding, carry out preheating to steel, weldability is good more, and then required preheating temperature is low more, otherwise then needs higher preheating temperature.It is generally acknowledged that when Pcm≤0.20%, 70 feather weight (yield strength 550MPa) steel can be realized pre-thermo-welding.
Below, the chemical ingredients of low crack sensitivity steel plate having 550 Mpa grade of yield strength of the present invention is done as being described in detail.
C: the effect in steel is solution strengthening, but C is unfavorable to welding property.C content is high more, and welding property is poor more, and for the bainitic steel that adopts the TMCP explained hereafter, the low more then toughness of C content is good more, and lower carbon content can be produced the ductility steel plate of bigger thickness, so C content of the present invention is controlled to be 0.005～0.04%.
Mo: improve the solidity to corrosion of steel, the present invention only need add and is no more than 0.2% Mo, because Mo is unfavorable to welding property, Mo is a kind of very expensive element simultaneously, its price is the several times of Cr, so the present invention replaced part Mo with Cr, to reach the purpose that reduces cost.
Nb: the present invention is by adding more Nb, to reach the purpose of crystal grain thinning and increase steel plate thickness, be the non-recrystallization temperature that improves steel on the other hand on the one hand, be convenient in the operation of rolling, adopt higher relatively finishing temperature, thereby the quickening roll speed is enhanced productivity.In addition, owing to strengthened the grain refining effect, make the thickness that can produce steel plate increase, adopt the chemical ingredients of the present invention's design, the maximum ga(u)ge that can produce steel plate is 80mm.
Si: the effect in steel mainly is solution strengthening, also can improve the hardening capacity of steel, adds in the general steel to be no more than intensity and the toughness that 0.70% Si helps improving steel.The Si that the present invention has added high level can play bigger solution strengthening effect, thereby reduces the add-on of alloying elements such as Mn and Cu, and this mainly is for the consideration that reduces manufacturing cost, because Si is the very cheap element of a kind of price.
Second aspect of the present invention provides a kind of manufacture method of low crack sensitivity steel plate having 550 Mpa grade of yield strength, and this method comprises smelting, casting, heating, rolling, refrigerating work procedure, wherein promptly enters refrigerating work procedure without thermal treatment behind rolling process.
In a preferred implementation: the continuously cast bloom after the casting or the thickness of steel ingot are not less than 4 times of Finished Steel plate thickness.
In another preferred implementation: in described heat-processed, Heating temperature is 1080～1180 ℃, and soaking time is 120～180 minutes.
In another preferred implementation: describedly rollingly be divided into the fs and subordinate phase is rolling.
In another preferred implementation: in the described fs operation of rolling, start rolling temperature is 1050～1150 ℃, when rolled piece thickness arrives 2～3 times of Finished Steel plate thickness, treats that on roller-way temperature is to 820～860 ℃.
In another preferred implementation: in the described subordinate phase operation of rolling, pass deformation rate is 10～25%, and finishing temperature is 810～840 ℃.
In another preferred implementation: in described process of cooling, steel plate enters accelerated cooling device, is cooled to 450～550 ℃, air cooling after the water outlet with the speed of 8～25 ℃/S.
In another preferred embodiment: air cooling adopts stacking or cold bed cooling.
In the manufacture method of low crack sensitivity steel plate having 550 Mpa grade of yield strength of the present invention, as follows to the technology controlling and process principle analysis of key step:
1, rolling technology
When rolled piece thickness arrives 2～3 times of Finished Steel plate thickness, treat that on roller-way temperature is to 820～860 ℃.For containing the Nb steel, its non-recrystallization temperature is about 950～1050 ℃, rolling steel billet temperature is reduced to 820～860 ℃, purpose is in order to guarantee that it has enough deflections in the non-recrystallization district, more highdensity dislocation accumulative total is arranged, for ferrite transformation provides more favourable forming core condition in the austenite of distortion.Bigger distortion also helps the separating out of carboritride of Nb, because the effect that deformation inductdion is separated out, bigger pass deformation rate will help the formation of precipitate and make its more tiny and disperse, simultaneously, tiny and precipitate and pinning effect thereof disperse provide highdensity forming core place and stop it to grow up and alligatoring for ferrite, and this strength and toughness for steel all plays favourable effect.
Finishing temperature is controlled at the low-temperature zone in non-recrystallization district, and this humidity province is near transformation temperature Ar simultaneously
3, promptly finishing temperature is 810～840 ℃, finish to gauge in this temperature range both for phase transformation provides higher energy accumulation, also was unlikely to bring too high load to milling train, relatively was suitable for slab production.
2, process for cooling
After the rolling end, steel plate enters accelerated cooling device, is cooled to 450～550 ℃ by 8～25 ℃/second speed.Because steel plate has accumulated very high dislocation of density and high strain energy in the operation of rolling, highdensity dislocation will with precipitate Nb (CN) particle interaction of Nb, finish to quickening in refrigerative air cooling (relaxation) process rolling, this interaction impels at the inner tiny Polygons dislocation cell structures in a large number that form of austenite crystal, the Nb atom has been stablized this Polygons cell structure with certain misorientation poly-partially and a large amount of fine Nb (CN) the separating out on the dislocation cell wall on the dislocation wall.Simultaneously, the moderate finite deformation of a passage has the effect of inducing ferrite transformation, under this inducing action, and Ar
3Point increases, and so-called " strain-induced transformation " phenomenon promptly occurs, at the bigger deflection in non-recrystallization humidity province, will help the intracrystalline forming core of acicular ferrite, can make martensite island on the bainite matrix even dispersion more that distributes simultaneously.
Adopting faster, cooling rate is for higher condensate depression is provided for bainite transformation, increase phase driving force, obtain more highdensity nucleation rate, thereby obtain matrix, make steel plate of the present invention have higher intensity and good toughness based on the bainite of refinement.
Beneficial effect of the present invention is:
1, by rational designing chemical composition, reduce C content significantly, and substitute noble elements such as part Mo and Ni with cheap alloying element such as Mn and Cr, and alloying element content is few, raw materials cost is lower, and welding crack sensibility is less, need not preheating before the weldering.
2, steel plate of the present invention need not carry out any extra thermal treatment, thereby has simplified manufacturing process, has reduced the manufacturing cost of steel.
3, because composition and technological design are reasonable, and from implementation result, process system is looser, can in, Plate Steel produces stably manufactured on the line.
4, low-crackle sensitive steel yield strength of the present invention can reach the 80mm plate greater than 550MPa, tensile strength greater than 670MPa, Xia Shi ballistic work Akv (20 ℃) 〉=150J, thickness of slab, and steel plate cross section hardness is even.
Description of drawings
Fig. 1 is the low-crackle sensitive steel cross section hardness measured value of the embodiment of the invention 6.
Embodiment
Below for a more detailed description to the present invention in conjunction with the accompanying drawings with embodiment.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment 1
Press chemical ingredients electric furnace or the converter smelting shown in the table 1, and be cast into continuously cast bloom or steel ingot, and continuously cast bloom or steel ingot are heated to 1170 ℃, be incubated 120 minutes, in, to carry out the fs on the thick milling train rolling, start rolling temperature is 1050 ℃, when rolled piece thickness is 60mm, treats that on roller-way temperature is to 850 ℃, it is rolling to carry out subordinate phase subsequently, subordinate phase rolling pass deformation rate is 15～20%, and finishing temperature is 830 ℃, and the Finished Steel plate thickness is 20mm.After the rolling end, steel plate enters and quickens cooling (ACC) device, is cooled to 500 ℃, stacking or cold bed cooling after the water outlet with the speed of 25 ℃/S.
Embodiment 2
Embodiment is with embodiment 1, and wherein Heating temperature is 1130 ℃, is incubated 150 minutes; Fs, rolling start rolling temperature was 1060 ℃, and rolled piece thickness is 90mm; The rolling start rolling temperature of subordinate phase is 840 ℃, and pass deformation rate is 10～12%, and finishing temperature is 810 ℃, and the Finished Steel plate thickness is 30mm; The steel plate speed of cooling is 20 ℃/S, and final temperature is 490 ℃.
Embodiment 3
Embodiment is with embodiment 1, and wherein Heating temperature is 1150 ℃, is incubated 150 minutes; Fs, rolling start rolling temperature was 1080 ℃, and rolled piece thickness is 120mm; The rolling start rolling temperature of subordinate phase is 830 ℃, and pass deformation rate is 10～15%, and finishing temperature is 820 ℃, and the Finished Steel plate thickness is 40mm; The steel plate speed of cooling is 15 ℃/S, and final temperature is 530 ℃.
Embodiment 4
Embodiment is with embodiment 1, and wherein Heating temperature is 1120 ℃, is incubated 180 minutes; Fs, rolling start rolling temperature was 1070 ℃, and rolled piece thickness is 150mm; The rolling start rolling temperature of subordinate phase is 830 ℃, and pass deformation rate is 10～15%, and finishing temperature is 840 ℃, and the Finished Steel plate thickness is 50mm; The steel plate speed of cooling is 12 ℃/S, and final temperature is 515 ℃.
Embodiment 5
Embodiment is with embodiment 1, and wherein Heating temperature is 1130 ℃, is incubated 180 minutes; Fs, rolling start rolling temperature was 1080 ℃, and rolled piece thickness is 150mm; The rolling start rolling temperature of subordinate phase is 840 ℃, and pass deformation rate is 10～15%, and finishing temperature is 830 ℃, and the Finished Steel plate thickness is 60mm; The steel plate speed of cooling is 10 ℃/S, and final temperature is 540 ℃.
Embodiment 6
Embodiment is with embodiment 1, and wherein Heating temperature is 1120 ℃, is incubated 180 minutes; Fs, rolling start rolling temperature was 1040 ℃, and rolled piece thickness is 160mm; The rolling start rolling temperature of subordinate phase is 830 ℃, and pass deformation rate is 10～15%, and finishing temperature is 840 ℃, and the Finished Steel plate thickness is 80mm; The steel plate speed of cooling is 8 ℃/S, and final temperature is 540 ℃.
The chemical ingredients (wt%) and the Pcm thereof of the low-crackle sensitive steel of table 1 embodiment of the invention 1-6
| Embodiment | C | Si | Mn | Cr | Mo | Cu | Ni | Nb | Al | Ti | B | Fe | Pcm |
| 1 | 0.04 | 0.55 | 1.40 | 0.15 | 0.17 | 0.29 | 0.20 | 0.080 | 0.02 | 0.01 | 0.0018 | Surplus | 0.174 |
| 2 | 0.04 | 0.65 | 1.65 | 0.12 | 0.12 | 0.20 | 0.10 | 0.065 | 0.03 | 0.02 | 0.0015 | Surplus | 0.177 |
| 3 | 0.005 | 0.70 | 1.85 | 0.20 | 0.18 | 0.30 | 0.15 | 0.075 | 0.04 | 0.012 | 0.0011 | Surplus | 0.168 |
| 4 | 0.02 | 0.40 | 1.50 | 0.20 | 0.15 | 0.25 | 0.10 | 0.040 | 0.03 | 0.01 | 0.0009 | Surplus | 0.147 |
| 5 | 0.006 | 0.70 | 1.84 | 0.05 | 0.05 | 0.10 | 0.12 | 0.065 | 0.03 | 0.02 | 0.0005 | Surplus | 0.137 |
| 6 | 0.01 | 0.50 | 1.60 | 0.10 | 0.20 | 0.05 | 0.20 | 0.047 | 0.02 | 0.03 | 0.0020 | Surplus | 0.146 |
Test example 1
Low-crackle sensitive steel to embodiment of the invention 1-6 carries out Mechanics Performance Testing, and test result sees Table 2.
The mechanical property of the low-crackle sensitive steel of table 2 embodiment of the invention 1-6
| Embodiment | Yield strength (MPa) | Tensile strength (MPa) | Unit elongation (%) | -20 ℃ of impact of collision merit/tough break ratios (J/%) |
| 1 | 655， 665 | 760， 765 | 18.0， 19.5 | 313/100， 307/100， 321/100 |
| 2 | 655， 650 | 740， 735 | 20.0， 20.5 | 323/100， 316/100， 312/100 |
| 3 | 640， 650 | 725， 725 | 21.0， 20.0 | 292/100， 290/100， 292/100 |
| 4 | 650， 640 | 725， 735 | 19.5， 18.0 | 319/100， 312/100， 296/100 |
| 5 | 610， 615 | 700， 695 | 19.5， 19.5 | 230/100， 250/100， 230/100 |
| 6 | 590， 595 | 695， 690 | 20.5， 20.5 | 219/100， 237/100， 234/100 |
From table 1 and table 2 as can be seen, the Pcm of low-crackle sensitive steel of the present invention≤0.20%, yield strength is all greater than 550MPa, tensile strength is greater than 670MPa, Xia Shi ballistic work Akv (20 ℃) 〉=150J, thickness of slab can reach 80mm, has good low-temperature flexibility and weldability.
Test example 2
By standard GB/T 4340-1999 the cross section hardness of the low-crackle sensitive steel of the embodiment of the invention 6 is measured, observed value is seen Fig. 1.
As can be seen from Figure 1, the cross section hardness of steel plate of the present invention is even.
Claims (9)
1, a kind of low crack sensitivity steel plate having 550 Mpa grade of yield strength, it is characterized in that, the chemical ingredients of described low-crackle sensitive steel comprises: C:0.005～0.04wt%, Si:0.40～0.70wt%, Mn:1.40～1.85wt%, Cr≤0.20wt%, Mo≤0.20wt%, Cu≤0.30wt%, Ni≤0.20wt%, Nb:0.04～0.08wt%, Al:0.02～0.06wt%, Ti:0.004～0.030wt%, B:0.0005～0.0020wt%, surplus is Fe and unavoidable impurities, and satisfies welding crack sensibility indices P cm≤0.20%.
2, the manufacture method of the described low crack sensitivity steel plate having 550 Mpa grade of yield strength of claim 1 comprises smelting, casting, heating, rolling, refrigerating work procedure, it is characterized in that, promptly enters refrigerating work procedure without thermal treatment behind described rolling process.
3, the manufacture method of low crack sensitivity steel plate having 550 Mpa grade of yield strength according to claim 2 is characterized in that, the continuously cast bloom after the casting or the thickness of steel ingot are not less than 4 times of Finished Steel plate thickness.
4, the manufacture method of low crack sensitivity steel plate having 550 Mpa grade of yield strength according to claim 2 is characterized in that, in described heat-processed, Heating temperature is 1080～1180 ℃, and soaking time is 120～180 minutes.
5, the manufacture method of low crack sensitivity steel plate having 550 Mpa grade of yield strength according to claim 2 wherein saidly rollingly is divided into the fs and subordinate phase is rolling.
6, the manufacture method of low crack sensitivity steel plate having 550 Mpa grade of yield strength according to claim 5, it is characterized in that, in the described fs operation of rolling, start rolling temperature is 1050～1150 ℃, when rolled piece thickness arrives 2～3 times of Finished Steel plate thickness, treat that on roller-way temperature is to 820～860 ℃.
7, the manufacture method of low crack sensitivity steel plate having 550 Mpa grade of yield strength according to claim 5 is characterized in that, in the described subordinate phase operation of rolling, pass deformation rate is 10～25%, and finishing temperature is 810～840 ℃.
8, the manufacture method of low crack sensitivity steel plate having 550 Mpa grade of yield strength according to claim 2, it is characterized in that in described process of cooling, steel plate enters accelerated cooling device, speed with 8～25 ℃/S is cooled to 450～550 ℃, air cooling after the water outlet.
9, the manufacture method of low crack sensitivity steel plate having 550 Mpa grade of yield strength according to claim 8, wherein said air cooling adopt stacking or cold bed cooling.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102191430A (en) * | 2010-03-19 | 2011-09-21 | 宝山钢铁股份有限公司 | Easy welding steel plate with yield strength of 550MPa and high toughness and manufacturing method thereof |
| CN101508014B (en) * | 2009-03-25 | 2012-01-18 | 山西太钢不锈钢股份有限公司 | Technological process capable reducing cross crack ratio of ferritic stainless steel continuous casting billet |
| CN101812634B (en) * | 2009-02-23 | 2012-03-28 | 宝山钢铁股份有限公司 | Low-carbon low-welding crack-sensitive high-strength steel and steel plate and manufacture method thereof |
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| CN106755869A (en) * | 2016-12-27 | 2017-05-31 | 内蒙古科技大学 | A kind of method that low energy consumption produces Q550D steel plates |
| CN110004358A (en) * | 2019-03-29 | 2019-07-12 | 山东钢铁集团日照有限公司 | A kind of low big thickness of Pcm value easily welds marine worker steel plate and its production method |
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| CN101812634B (en) * | 2009-02-23 | 2012-03-28 | 宝山钢铁股份有限公司 | Low-carbon low-welding crack-sensitive high-strength steel and steel plate and manufacture method thereof |
| CN101508014B (en) * | 2009-03-25 | 2012-01-18 | 山西太钢不锈钢股份有限公司 | Technological process capable reducing cross crack ratio of ferritic stainless steel continuous casting billet |
| CN102191430A (en) * | 2010-03-19 | 2011-09-21 | 宝山钢铁股份有限公司 | Easy welding steel plate with yield strength of 550MPa and high toughness and manufacturing method thereof |
| CN102691015A (en) * | 2011-03-25 | 2012-09-26 | 宝山钢铁股份有限公司 | YP500MPa-level thick steel plate with excellent low-temperature toughness and manufacturing method thereof |
| CN106755869A (en) * | 2016-12-27 | 2017-05-31 | 内蒙古科技大学 | A kind of method that low energy consumption produces Q550D steel plates |
| CN106755869B (en) * | 2016-12-27 | 2018-07-27 | 内蒙古科技大学 | A kind of method of low energy consumption production Q550D steel plates |
| CN110004358A (en) * | 2019-03-29 | 2019-07-12 | 山东钢铁集团日照有限公司 | A kind of low big thickness of Pcm value easily welds marine worker steel plate and its production method |
| CN110004358B (en) * | 2019-03-29 | 2021-05-25 | 山东钢铁集团日照有限公司 | Marine steel plate with low Pcm value, large thickness and easy welding and production method thereof |
| CN114752855A (en) * | 2022-04-12 | 2022-07-15 | 江阴兴澄特种钢铁有限公司 | 460 MPa-grade economical low-yield-ratio low-crack-sensitivity structural steel and manufacturing method thereof |
| CN114752855B (en) * | 2022-04-12 | 2023-09-15 | 江阴兴澄特种钢铁有限公司 | 460 MPa-grade economical low-yield-ratio low-crack-sensitivity structural steel and manufacturing method thereof |
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