CN101078085A - Solution strengthening isotropical steel and preparation method thereof - Google Patents
Solution strengthening isotropical steel and preparation method thereof Download PDFInfo
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Abstract
Solid solution strengthening isotropy steel, the mass percent of it' s components is : C: 0.03-0.07,Si: <= 0.03, Mn: 0.4-1.0, P: 0.02-0.08, S: <=0.02, N: <=0.005, B: 0.002-0.005, Al: 0.015-0.05, the other is Fe and the impurity, which can be avoided. It' s manufacture method contains the following steps: 1) Smelting, to make billet by casting; 2) Hot reduction of billet, finishing temperature : 830-930deg.C, coiling temperature: 520-620deg.C, 3) Acidwashing, routine acidwashing technology. 4) Cold rolling, the draft is 50-80%, 5) Annealing, heat preserbation temperature: 630-720deg.C. Heat preservation time: 4-30h, to come out from stove when it has been cooled to lower than 200deg.C; 6) Leveling, the cold rolling product will be gained. The routine of solid solution strengthening is used in this patent, and it takes advantage of C and Mn to decrease the sum lever of r value, and adjusts the relative difference of r value on three directions by adding P, some proper technology is also be used to help it, and the ideal isotropy steel can be gained.
Description
Technical field
The present invention relates to the manufacturing technology of isotropy steel, particularly the isotropy of solution strengthening cold rolling/electro-galvanizing/hot-dip galvanized steel strip and manufacture method thereof.
Background technology
Automotive industry is for the energy-conservation needs of loss of weight, and the steel plate to high formability has proposed higher requirement of strength in recent years.The isotropy steel be meant the Δ r value of steel plate level off to 0 and the r value level off to 1.The steady flow of material on all directions and mutually coordinating when isotropy helps being shaped do not hindered by adjacent hardened zone, helps obtaining good formability, wall thickness reduction evenly and do not have a system ear.
As patent No. DE3843732, the chemical ingredients of its disclosed isotropy steel is: C0.03～0.10%, Si≤0.40%, Mn 0.10～1.0%, P≤0.08%, S≤0.02%, ≤ 0.009%N, 0.015～0.080%Al, Ti 0.01～0.04%, among≤0.15% Cu, V and the Ni one or more, other is that Fe and inevitable impurity are formed.Pass through Ar
3(420～620 ℃) are batched in above temperature hot rolling, low temperature, cold rolling, batch annealing (700 ℃ insulation a few hours more than) and smooth after, can obtain lower Δ r value.
Also just like US5906690, the chemical ingredients of its steel is: C 0.015～0.08%, Si≤1.0%, Mn≤1.8%, P 0.01-0.1%, S≤0.02%, N≤0.008%, Al≤0.080% contains among Ti, V, Nb, the Zr one or more in addition, and other is Fe.By the following temperature finish to gauge of Ar3 (≤850 ℃), high temperature batches (＞650 ℃), cold rolling (55-85%), continuous annealing (800 ℃ insulation tens seconds) and smooth after, can obtain lower Δ r value.
Patent No. US2004/0112483A1, the chemical ingredients of its steel is: C 0.03～0.06%, Si0.08～0.20%, Mn 0.5～1.10%, P≤0.015%, S≤0.015%, N≤0.007%, Al 0.015～0.07%, Ni≤0.04, Cu≤0.04, Mo≤0.008, Ti≤0.005.B/N:0.65～1.60, Mn/Si:4～15, other is Fe and impurity.Pass through Ar
3(500～700 ℃) are batched in above temperature finish to gauge, through 30 hours cool to room temperature at a slow speed, after smooth, can obtain intensity and plasticity preferably after cold rolling (50-80%), batch annealing (700 ℃ were incubated more than a few hours), the annealing.
But there are the following problems for above-mentioned disclosed steel:
The steel of patent No. DE3843732 adopts to add the method that Ti hinders recrystallize, and crystal grain thinning improves texture, can obtain isotropy preferably.But because after adding Ti, yield extension is elongated, resistance to deformation is big, the great difficulty that can cause smooth operation to produce, the difficult control of plate shape.In addition, adopt bigger smooth rate after, the plasticity of steel plate reduces.The yield tensile ratio height is the characteristic of micro-alloyed steel, therefore, the steel plate of Zhi Zaoing in this way, because the yield tensile ratio height, work hardening rate is low, plasticity is relatively poor, makes difficulty in addition, to the equipment requirements height, therefore has significant disadvantages.
Patent No. US5906690 adopts the composition design that adds Ti, has the technical disadvantages same with above-mentioned DE3843732, and, in order to adapt to the characteristics of continuous annealing process, adopted the rolling technology of two-phase region in preceding operation.Because when two-phase region was rolling, steel was in phase transformation and carries out the stage, the resistance to deformation instability, difficult switchboard shape, therefore, it is lower to make feasibility.As seen, all there is big defective in the quality of this invention from the operation feasibility to the finished product.
The steel of patent No. US2004/0112483A1 has adopted the solution strengthening technical scheme of C-Si-Mn, and the product of manufacturing is mainly used in the plating organic membrane, has lower yield tensile ratio.But in should inventing, need control B/N ratio, wish control Mn/Si ratio simultaneously.Because N in metallurgical process, is difficult to control stabilization, can bring big difficulty therefore for actual enforcement.This isotropy steel making method requires to add Si, and Si forms oxide inclusion easily, and is unfavorable for punching performance, especially for thin plate, influences especially serious.Si also reduces the wettability of liquid zinc at surface of steel plate, and the zinc layer adheres to when being unfavorable for pot galvanize.In addition, this invention requires to cool off with a kind of quasi-static super slow cool down speed after the recrystallization annealing, is unfavorable for save energy, has reduced efficiency of equipment.Therefore, this technical scheme also has aforesaid defective.
Summary of the invention
The objective of the invention is to design a kind of solution strengthening isotropy steel and manufacture method thereof, by reasonable component and technological design, what obtain cold rolling, electro-galvanizing and pot galvanize has low carbon high-strength degree high formability and a good isotropic steel plate.
For achieving the above object, technical scheme of the present invention is,
Solution strengthening isotropy steel, its composition quality per-cent is:
C：0.03～0.07
Si：≤0.03
Mn：0.4～1.0
P：0.02～0.08
S：≤0.02
N：≤0.005
B：0.002-0.005
Al：0.015-0.05
All the other are Fe and inevitable impurity.
Further, its composition quality per-cent is:
C：0.04～0.06
Si：≤0.01
Mn：0.5～0.7
P：0.03～0.07
S：≤0.005
N：≤0.004
B：0.0025-0.004
All the other are Fe and inevitable impurity.
Further, in the mentioned component, impurity Ti+Nb :≤0.004.
The manufacture method of solution strengthening isotropy steel of the present invention comprises the steps,
1) smelts, be cast into steel billet;
2) hot rolling of steel billet, finishing temperature: 830-930 ℃, coiling temperature: 520～620 ℃;
3) pickling, conventional acid cleaning process;
4) cold rolling, draft is 50～80%;
5) annealing, was cooled to come out of the stove below 200 ℃ in stove, and carried out air-cooled or air cooling in soaking time: 4-30 hour by holding temperature: 630-720 ℃;
6) smooth, the smooth cold-rolled products that obtain.
Again, obtain cold-rolled products after step 6) 1.2-1.6% is smooth, re-plating zinc obtains the electro-galvanizing product.
Step 6) is smooth to be the smooth of 0.3-0.8%, and smooth back Continuous Hot Dip Galvanizing is zinc-plated, adopts fully hard annealing process, annealing temperature 550-650 ℃, and smooth through 1.0～1.6% then, obtain the pot galvanize product.
In the present invention,
C has certain influence to the r value of steel, and when C was very low, the r value was generally higher, and anisotropy is very big; The C too high levels then is unfavorable for weldability and plasticity.Therefore, among the present invention, choose carbon amount interval and might obtain lower r value, for obtaining isotropic basis, the amount of taking into account welding simultaneously and shaping.
Si has strengthening effect also to reduce the r value in steel, but Si easily forms oxide compound, is unfavorable for plasticity, also reduces the coating of steel plate, so the present invention does not add Si and limits Si content in the steel.
Mn plays the solution strengthening effect, reduce the r value, but Mn obviously reduces the plasticity of steel.Reach more than 1.0% if add Mn separately, the plasticity of steel will be a greater impact.The present invention chooses Mn as one of main solution strengthening element, and work to reduce the r value, but be not enough to obtain the ideal isotropy with Mn separately, because the r90＞r0＞r45 of general soft steel, though Mn has reduced r90 and r0 also reduces r45 simultaneously, cause r90 and r0 to be higher than 1, and r45 is lower than 1, because r90 and r0 are more much higher than r45, Δ r value is more than 0.4 usually.Therefore, also need P comprehensively to work, could obtain the ideal isotropy.
P plays the solution strengthening effect, and the P of trace just has clearly strengthening effect, thereby little to the plasticity influence, does another main solution strengthening element so the present invention chooses P.The even more important effect of P is exactly and Mn regulates the r value together, promotes to obtain isotropy.When P 0.02% when following, improvement to Δ r value is not obvious usually, reach 0.02% when above when adding P, r0 and r90 will further reduce on the basis that originally only adds Mn, be reduced to and be in close proximity to 1, and further do not descended less than 1 r45 this moment, thereby make that the r value of three directions is more approaching, thereby r averages out to be close to 1 and Δ r value levels off to 0.According to composition of the present invention and technological design, Δ r value can be controlled between the 0.1-0.3, isotropy is very desirable.P has certain reduction to the plasticity of steel when improving intensity, therefore limit it and add the upper limit.
B plays the effect that improves aging resistance in steel and the N combination.
S is impurity element in steel, and content should be low as far as possible.
Al has played the effect of desoxydatoin in steel.
N is intrinsic element in steel, easily causes the timeliness of steel, can it be controlled at lower level according to the steelmaking equipment condition.
Impurity element Ti, Nb are also influential to performance in steel, residual content are controlled at lower level, Ti+Nb among the present invention as far as possible :≤0.004 or≤0.003.
Technical process and significant parameter span of control are as follows:
1, smelts, be cast into steel billet → hot rolling → pickling → cold rolling → annealing → smooth → cold-rolled products;
2, smelt, be cast into steel billet → hot rolling → pickling → cold rolling → annealing → smooth → plating → electro-galvanizing product;
3, smelt, be cast into steel billet → hot rolling → pickling → cold rolling → annealing → smooth → pot galvanize → pot galvanize product.
Hot rolling: 830-930 ℃ finish to gauge, 520～620 ℃ are batched; Adopt conventional finishing temperature, help the stability of technology, adopt lower coiling temperature, help obtaining tiny crystal grain, promote chaotic distribution, thereby reduce anisotropy.Adopt cooling fast after the hot rolling, isotropic effect is better.
Pickling: routine, fully flush away iron scale;
Cold rolling: draft is 50～80%; In the present invention, cold rolling draft is little to influencing to the r value, can select suitable cold rolling draft arbitrarily in 50～80% scopes;
Annealing: 630-720 ℃ of insulation, soaking time should guarantee abundant recrystallize,, is cooled to then come out of the stove below 200 ℃ in stove according to band steel weight control in 4-30 hour scope, carries out air-cooled or air cooling.Cross low holding temperature and can cause recrystallize incomplete, plasticity is low; Too high holding temperature then can be destroyed the genetic effect of organizing that hot rolling low temperature batches.
Band steel after the annealing obtains cold-rolled products after process 1.2-1.6% is smooth, if remove electro-galvanizing, then obtains the electro-galvanizing product.Smooth amount is lower than 1.2% can not effectively eliminate yield extension, and smooth rate is higher than 1.6% and causes rolling load excessive on the one hand, also reduces plasticity in addition.
Band steel after the annealing through behind 0.3-0.8% smooth, goes Continuous Hot Dip Galvanizing zinc-plated, adopts fully hard annealing process, and annealing temperature 550-650 ℃, smooth through 1.0～1.6% then, obtain the pot galvanize product.Adopt the smooth rate of 0.3-0.8%, can improve plate shape, help the stable of pot galvanize unit, do not influence the plasticity of steel simultaneously substantially; 550-650 ℃ of pot galvanize annealing both can have been reduced surface film oxide, helped the coating performance, did not influence the steel plate mechanical property that obtains of annealing operation in front simultaneously.The pot galvanize annealing temperature is low can to cause reduction insufficient, influences coating; The pot galvanize annealing temperature is high can to influence the mechanical property that the front annealing operation obtains.
The invention steel can obtain yield strength between 200-300Mpa after above-mentioned processing, tensile strength has good isotropic band steel between 350-450Mpa.
Beneficial effect of the present invention
The present invention adopts the solution strengthening thinking, utilize Mn to reduce the aggregate level of r value, and by adding the relative different that P regulates 3 direction r values, auxiliary with suitable technology, obtain the ideal isotropy, have low carbon high-strength degree high formability and have isotropy characteristics (the r value levels off to 1, and Δ r value levels off to 0).And utilize the present invention, can obtain cold rolling, electro-galvanizing and three kinds of products of pot galvanize simultaneously,, all have salient feature, be better than existing invention no matter from making convenience, economy and environmental protection equal angles.
Steel of the present invention is after smelting, hot rolling, cold rolling, annealing, smooth, electro-galvanizing or pot galvanize, make cold rolling, electro-galvanizing or pot galvanize finished product and can be used for automobile making and other intensity and plasticity are all had the part of high requirements, have application promise in clinical practice.
Embodiment
Embodiment is referring to table 1,
Table 1 wt%
| Embodiment | Chemical ingredients, wt% | ||||||||
| C | Si | Mn | P | S | Al | N | B | Ti+Nb | |
| 1 | 0.03 | 0.03 | 0.4 | 0.02 | 0.01 | 0.05 | 0.004 | 0.002 | 0.003 |
| 2 | 0.04 | 0.01 | 0.5 | 0.03 | 0.02 | 0.045 | 0.005 | 0.005 | 0 |
| 3 | 0.06 | 0.012 | 0.6 | 0.07 | 0.008 | 0.04 | 0.003 | 0.003 | 0 |
| 4 | 0.07 | 0.02 | 0.7 | 0.05 | 0.007 | 0.03 | 0.002 | 0.0035 | 0 |
| 5 | 0.05 | 0.009 | 0.8 | 0.08 | 0.005 | 0.025 | 0.0025 | 0.0025 | 0.004 |
| 6 | 0.04 | 0.01 | 1.0 | 0.04 | 0.004 | 0.015 | 0.0045 | 0.004 | 0 |
Table 2
| 4 | 830 | 600 | 75 | 660 | 1.5 | ||
| 2-2 | 880 | 620 | 80 | 670 | 1.6 | ||
| 6 | 880 | 570 | 70 | 680 | 1.3 | ||
| 5 | 880 | 570 | 70 | 660 | 0.5 | 650 | 1.2 |
| 4-2 | 880 | 570 | 70 | 660 | 0.3 | 600 | 1.3 |
| 4-3 | 880 | 570 | 70 | 660 | 0.4 | 550 | 1.4 |
| 4-4 | 880 | 570 | 70 | 680 | 0.8 | 580 | 1.3 |
The performance of table 3 invention steel
Table 2 is depicted as the processing parameter and the mechanical property contrast of steel of the present invention.Steel of the present invention through smelting, hot rolling, cold rolling, annealing and smooth after (or after plating or pot galvanize) intensity of obtaining be shown in Table 3.
As can be seen from Table 3, can produce the steel plate of yield strength between 200～300Mpa, have good plasticity and isotropy according to the present invention.As seen, by the suitable composition design of the present invention, reasonably hot rolling, cold rolling and annealing process, and zincincation, the isotropy steel plate that can obtain to have excellent moldability.Compare with other invention,, all improve a lot to energy-conservation and environmental protection no matter from implementing difficulty.And, can obtain the product of pot galvanize after the hot dip, help improving solidity to corrosion greatly, reduce product cost.From these angles, the present invention comprehensively is better than original invention in the design of composition design and processes.
Claims (6)
1. solution strengthening isotropy steel, its composition quality per-cent is:
C：0.03～0.07
Si：≤0.03
Mn：0.4～1.0
P：0.02～0.08
S：≤0.02
N：≤0.005
B：0.002-0.005
Al：0.015-0.05
All the other are Fe and inevitable impurity.
2. solution strengthening isotropy steel as claimed in claim 1 is characterized in that, its composition quality per-cent is:
C：0.04～0.06
Si：≤0.01
Mn：0.5～0.7
P：0.03～0.07
S：≤0.005
N：≤0.004
B：0.0025-0.004
All the other are Fe and inevitable impurity.
3. solution strengthening isotropy steel as claimed in claim 1 or 2 is characterized in that, in the described impurity, and Ti+Nb :≤0.004.
4. the manufacture method of solution strengthening isotropy steel as claimed in claim 1 comprises the steps,
1) smelts by the described composition of claim 1, be cast into steel billet;
2) hot rolling of steel billet, finishing temperature: 830-930 ℃, coiling temperature: 520～620 ℃;
3) pickling, conventional acid cleaning process;
4) cold rolling, draft is 50～80%;
5) annealing, was cooled to come out of the stove below 200 ℃ in stove, and carried out air-cooled or air cooling in soaking time: 4-30 hour by holding temperature: 630-720 ℃;
6) smooth, the smooth cold-rolled products that obtain.
5. the manufacture method of solution strengthening isotropy steel as claimed in claim 4 is characterized in that, obtains cold-rolled products after step 6) 1.2-1.6% is smooth, and re-plating zinc obtains the electro-galvanizing product.
6. the manufacture method of solution strengthening isotropy steel as claimed in claim 4, it is characterized in that, step 6) is smooth to be the smooth of 0.3-0.8%, smooth back Continuous Hot Dip Galvanizing is zinc-plated, adopt fully hard annealing process, annealing temperature 550-650 ℃, smooth through 1.0～1.6% then, obtain the pot galvanize product.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736193B (en) * | 2008-11-10 | 2012-02-01 | 攀钢集团研究院有限公司 | Low carbon steel plate and preparation method thereof |
| CN102712961A (en) * | 2009-11-03 | 2012-10-03 | 沃斯特阿尔派因钢铁有限责任公司 | Manufacturing galvannealed sheets by heat-treating electrolytically finished sheets |
| CN102716905A (en) * | 2012-06-18 | 2012-10-10 | 首钢总公司 | Method for producing cold-rolled sheet for surface coating and plating base plate |
| CN103882202A (en) * | 2012-12-20 | 2014-06-25 | 上海梅山钢铁股份有限公司 | Method for making high-strength hot-dip galvanized steel through continuous annealing |
| CN104060066A (en) * | 2013-06-07 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-rolled steel plate and preparation method thereof |
| CN116005074A (en) * | 2023-01-30 | 2023-04-25 | 宁波市鄞州鑫旺热镀锌有限公司 | Hot dip galvanized steel sheet and preparation method thereof |
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2006
- 2006-05-25 CN CNB2006100268985A patent/CN100473738C/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736193B (en) * | 2008-11-10 | 2012-02-01 | 攀钢集团研究院有限公司 | Low carbon steel plate and preparation method thereof |
| CN102712961A (en) * | 2009-11-03 | 2012-10-03 | 沃斯特阿尔派因钢铁有限责任公司 | Manufacturing galvannealed sheets by heat-treating electrolytically finished sheets |
| CN102716905A (en) * | 2012-06-18 | 2012-10-10 | 首钢总公司 | Method for producing cold-rolled sheet for surface coating and plating base plate |
| CN102716905B (en) * | 2012-06-18 | 2014-11-19 | 首钢总公司 | Method for producing cold-rolled sheet for surface coating and plating base plate |
| CN103882202A (en) * | 2012-12-20 | 2014-06-25 | 上海梅山钢铁股份有限公司 | Method for making high-strength hot-dip galvanized steel through continuous annealing |
| CN103882202B (en) * | 2012-12-20 | 2016-03-30 | 上海梅山钢铁股份有限公司 | The manufacture method of the high-strength hot-galvanized steel of a kind of continuous annealing |
| CN104060066A (en) * | 2013-06-07 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Cold-rolled steel plate and preparation method thereof |
| CN116005074A (en) * | 2023-01-30 | 2023-04-25 | 宁波市鄞州鑫旺热镀锌有限公司 | Hot dip galvanized steel sheet and preparation method thereof |
| CN116005074B (en) * | 2023-01-30 | 2023-06-16 | 宁波市鄞州鑫旺热镀锌有限公司 | Hot dip galvanized steel sheet and preparation method thereof |
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