CN104726766A - Low-cost 260 MPa-level steel for automobile and production method thereof - Google Patents
Low-cost 260 MPa-level steel for automobile and production method thereof Download PDFInfo
- Publication number
- CN104726766A CN104726766A CN201510108468.7A CN201510108468A CN104726766A CN 104726766 A CN104726766 A CN 104726766A CN 201510108468 A CN201510108468 A CN 201510108468A CN 104726766 A CN104726766 A CN 104726766A
- Authority
- CN
- China
- Prior art keywords
- steel
- production method
- 260mpa
- rank
- low cost
- 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.)
- Pending
Links
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses low-cost 260 MPa-level steel for an automobile and a production method thereof. The chemical components of the steel by mass percent are as follows: 0.06-0.1% of C, 0.3-0.6% of Mn, 0.2-0.5% of Si, less than or equal to 0.020% of S, less than or equal to 0.025% of P, 0.020-0.050% of Als and the balance of iron and unavoidable impurities. The method comprises the steps of performing hot rolling, cold rolling, cover annealing and leveling, wherein the technological parameters of the cover annealing process include: the hot-spot temperature is 630-680 DEG C, the cold-spot temperature is 580-620 DEG C, the heat preservation time is 4-7.5h, the time from stopping heating to removing a heating cover is 3-5h and the whole annealing period is 37-45h. Through the Si-Mn solid solution strengthening composition design, a unique cover annealing process is adopted for the subsequent annealing process, so that the production cost is reduced, the good performance of the final product is guaranteed and the low-cost cold rolled high-strength steel with yield strength of 260 MPa is obtained.
Description
Technical field
The invention belongs to metal material field, especially a kind of 260MPa rank automobile steel of low cost and production method thereof.
Background technology
In the last few years, automotive industry both domestic and external is fast-developing, the demand of automobile steel is also increased year by year, simultaneously, energy-conserving and environment-protective become the important trend of Hyundai Motor development, one of them measure alleviates vehicle body deadweight exactly, but the safety performance of vehicle body can not be sacrificed, each iron and steel enterprise of the world all various high-strength vehicle steel of Devoting Major Efforts To Developing for this reason, wherein Hi-Stren steel carbon equivalent is low, has good welding property, is suitable for manufacturing to the higher structural part of rigidity requirement and strut member, therefore, widely used in automobile component manufacture.
At present, the cold rolling high-strength steel of domestic and international production yield strength 260MPa rank, the many employings of Composition Design add the expensive alloying elements such as Nb, Ti, V, utilize refined crystalline strengthening method to obtain the hot rolling raw material of high strength; Cold rolled annealed, the continuous annealing method that adopts carries out recrystallization annealing more, finally obtains the finished product that intensity is high, plasticity is good.But this cold rolling high-strength steel is owing to adding noble metal, cause that its cost is more expensive, production cost is higher.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of 260MPa rank automobile steel not adding the low cost of noble metal element; Present invention also offers a kind of production method of 260MPa rank automobile steel of low cost.
For solving the problems of the technologies described above, the mass percentage of chemical composition of the present invention is: C:0.06-0.1%, Mn:0.3-0.6%, Si:0.2-0.5%, S≤0.020%, P≤0.025%, Als:0.020-0.050%, and all the other are iron and inevitable impurity.
The inventive method is: the steel grade adopting the chemical composition of above-mentioned mass percentage; It comprises hot rolling, cold rolling, bell-type annealing and smooth operation; The processing parameter of described bell-type annealing operation is: hot(test)-spot temperature 630 ~ 680 DEG C, cold-point temperature 580 ~ 620 DEG C, soaking time 4 ~ 7.5h, and from stopping the time being heated to remove heating mantles to be 3 ~ 5h, the whole annealing cycle is 37 ~ 45h.
Hot-rolled process described in the inventive method: finishing temperature 850 ~ 880 DEG C, coiling temperature 580 ~ 620 DEG C.
Cold rolling process described in the inventive method: total reduction >=50%.
Smooth operation described in the inventive method: smooth unit elongation is (d/4) % ~ (d) %, and d is the mm of thickness of steel plate.
The beneficial effect adopting technique scheme to produce is: the present invention, by the Composition Design of Si-Mn solution strengthening, does not add the expensive alloying elements such as Nb, Ti, V, reduces production cost.
The inventive method, by the Composition Design of Si-Mn solution strengthening, subsequent anneal process adopts unique bell-type annealing technique, has both reduced the premium properties that production cost in turn ensure that the finished product, thus has obtained the cold rolling high-strength steel of low cost yield strength 260MPa rank.
The inventive method adopts unique hot rolling, cold rolling, bell-type annealing, flattening process, thus improving product performance effectively, improve production stability.
Embodiment
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
In following embodiment, Performance Detection sample is horizontal sample, and gauge length is 80mm, and width is 20mm.
Embodiment 1: composition and the production method of the 260MPa rank automobile steel of this low cost are as described below.
Finished product composition following (mass percent: %): C:0.081, Mn:0.40, S:0.004, P:0.019, Si:0.25, Als:0.024.Hot rolling finishing temperature 860 DEG C, coiling temperature 600 DEG C.Cold rolled sheet specification: 1250 × 1.5mm, cold rolling total reduction is 57%, bell-type annealing hot(test)-spot temperature 680 DEG C, cold-point temperature 600 DEG C, soaking time 5h, band heating mantles soaking time 4h, whole annealing cycle 41h.Smooth unit elongation is 0.5%.Through checking yield strength to be 281MPa, tensile strength is 415MPa, and unit elongation A80mm is 34.5%.
Embodiment 2: composition and the production method of the 260MPa rank automobile steel of this low cost are as described below.
Finished product composition following (mass percent: %): C:0.070, Mn:0.51, S:0.010, P:0.020, Si:0.20, Als:0.033.Hot rolling finishing temperature 865 DEG C, coiling temperature 610 DEG C.Cold rolled sheet specification: 1000 × 1.0mm, cold rolling total reduction is 66.7%, bell-type annealing hot(test)-spot temperature 660 DEG C, cold-point temperature 580 DEG C, soaking time 4.5h, band heating mantles soaking time 3.5h, whole annealing cycle 40h.Smooth unit elongation is 0.3%.Through checking yield strength to be 275MPa, tensile strength is 405MPa, and unit elongation A80mm is 35.5%.
Embodiment 3: composition and the production method of the 260MPa rank automobile steel of this low cost are as described below.
Finished product composition following (mass percent: %): C:0.060, Mn:0.60, S:0.006, P:0.018, Si:0.40, Als:0.024.Hot rolling finishing temperature 850 DEG C, coiling temperature 600 DEG C.Cold rolled sheet specification: 1450 × 2.0mm, cold rolling total reduction is 50%, bell-type annealing hot(test)-spot temperature 670 DEG C, cold-point temperature 600 DEG C, soaking time 5h, band heating mantles soaking time 4.5h, whole annealing cycle 42h.Smooth unit elongation is 0.8%.Through checking yield strength to be 295MPa, tensile strength is 430MPa, and unit elongation A80mm is 30.5%.
Embodiment 4: composition and the production method of the 260MPa rank automobile steel of this low cost are as described below.
Finished product composition following (mass percent: %): C:0.1, Mn:0.30, S:0.012, P:0.022, Si:0.50, Als:0.020.Hot rolling finishing temperature 880 DEG C, coiling temperature 620 DEG C.Cold rolled sheet specification: 1300 × 1.2mm, cold rolling total reduction is 65.7%, bell-type annealing hot(test)-spot temperature 680 DEG C, cold-point temperature 620 DEG C, soaking time 6h, band heating mantles soaking time 4h, whole annealing cycle 42.5h.Smooth unit elongation is 0.75%.Through checking yield strength to be 297MPa, tensile strength is 435MPa, and unit elongation A80mm is 30%.
Embodiment 5: composition and the production method of the 260MPa rank automobile steel of this low cost are as described below.
Finished product composition following (mass percent: %): C:0.080, Mn:0.50, S:0.020, P:0.025, Si:0.40, Als:0.050.Hot rolling finishing temperature 870 DEG C, coiling temperature 615 DEG C.Cold rolled sheet specification: 1200 × 0.8mm, cold rolling total reduction is 60%, bell-type annealing hot(test)-spot temperature 670 DEG C, cold-point temperature 590 DEG C, soaking time 5h, band heating mantles soaking time 4.5h, whole annealing cycle 40.5h.Smooth unit elongation is 0.6%.Through checking yield strength to be 287MPa, tensile strength is 425MPa, and unit elongation A80mm is 34%.
Claims (5)
1. a 260MPa rank automobile steel for low cost, is characterized in that, the mass percentage of its chemical composition is: C:0.06-0.1%, Mn:0.3-0.6%, Si:0.2-0.5%, S≤0.020%, P≤0.025%, Als:0.020-0.050%, all the other are iron and inevitable impurity.
2. the production method of the 260MPa rank automobile steel of a low cost, it is characterized in that: the mass percentage of its steel grade chemical composition is: C:0.06-0.1%, Mn:0.3-0.6%, Si:0.2-0.5%, S≤0.020%, P≤0.025%, Als:0.020-0.050%, all the other are iron and inevitable impurity;
It comprises hot rolling, cold rolling, bell-type annealing and smooth operation; The processing parameter of described bell-type annealing operation is: hot(test)-spot temperature 630 ~ 680 DEG C, cold-point temperature 580 ~ 620 DEG C, soaking time 4 ~ 7.5h, and from stopping the time being heated to remove heating mantles to be 3 ~ 5h, the whole annealing cycle is 37 ~ 45h.
3. the production method of the 260MPa rank automobile steel of low cost according to claim 2, is characterized in that, described hot-rolled process: finishing temperature 850 ~ 880 DEG C, coiling temperature 580 ~ 620 DEG C.
4. the production method of the 260MPa rank automobile steel of low cost according to claim 2, is characterized in that, described cold rolling process: total reduction >=50%.
5. the production method of the 260MPa rank automobile steel of the low cost according to claim 2,3 or 4, is characterized in that, described smooth operation: smooth unit elongation is (d/4) % ~ (d) %, and d is the mm of thickness of steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510108468.7A CN104726766A (en) | 2015-03-12 | 2015-03-12 | Low-cost 260 MPa-level steel for automobile and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510108468.7A CN104726766A (en) | 2015-03-12 | 2015-03-12 | Low-cost 260 MPa-level steel for automobile and production method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104726766A true CN104726766A (en) | 2015-06-24 |
Family
ID=53451172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510108468.7A Pending CN104726766A (en) | 2015-03-12 | 2015-03-12 | Low-cost 260 MPa-level steel for automobile and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104726766A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106906417A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | The processing method that a kind of automobile hardens high-strength steel with 220BH cold rolling bakings |
| CN106906419A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | A kind of automobile 220BH cold rolling bakings harden high-strength steel |
| CN106906418A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | The processing method that a kind of automobile hardens high-strength steel with 180BH cold rolling bakings |
| CN113621883A (en) * | 2021-08-12 | 2021-11-09 | 上海宝钢新材料技术有限公司 | Lightweight automobile roof front cross beam lower plate, preparation method and front cross beam assembly |
| CN113621884A (en) * | 2021-08-12 | 2021-11-09 | 上海宝钢新材料技术有限公司 | Lightweight automobile roof rear cross beam lower plate, preparation method and rear cross beam assembly |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1904115A (en) * | 2006-07-31 | 2007-01-31 | 武汉钢铁(集团)公司 | Production method of 450MPa grade cold rolled magnetic pole steel |
| CN1904113A (en) * | 2006-07-31 | 2007-01-31 | 武汉钢铁(集团)公司 | Production method of 250 MPa grade cold rolled magnetic pole steel |
| CN103509997A (en) * | 2013-09-25 | 2014-01-15 | 马钢(集团)控股有限公司 | 440MPa-class cold-rolled high-intensity automobile structural steel and manufacturing method thereof |
| CN103509996A (en) * | 2013-09-25 | 2014-01-15 | 马钢(集团)控股有限公司 | 400 MPa-tensile-strength high-strength carbon-manganese constructional steel and manufacturing method thereof |
-
2015
- 2015-03-12 CN CN201510108468.7A patent/CN104726766A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1904115A (en) * | 2006-07-31 | 2007-01-31 | 武汉钢铁(集团)公司 | Production method of 450MPa grade cold rolled magnetic pole steel |
| CN1904113A (en) * | 2006-07-31 | 2007-01-31 | 武汉钢铁(集团)公司 | Production method of 250 MPa grade cold rolled magnetic pole steel |
| CN103509997A (en) * | 2013-09-25 | 2014-01-15 | 马钢(集团)控股有限公司 | 440MPa-class cold-rolled high-intensity automobile structural steel and manufacturing method thereof |
| CN103509996A (en) * | 2013-09-25 | 2014-01-15 | 马钢(集团)控股有限公司 | 400 MPa-tensile-strength high-strength carbon-manganese constructional steel and manufacturing method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 李一栋等: "唐钢酸轧-退火-平整-重卷主线工艺优化", 《轧钢》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106906417A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | The processing method that a kind of automobile hardens high-strength steel with 220BH cold rolling bakings |
| CN106906419A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | A kind of automobile 220BH cold rolling bakings harden high-strength steel |
| CN106906418A (en) * | 2015-12-23 | 2017-06-30 | 本钢板材股份有限公司 | The processing method that a kind of automobile hardens high-strength steel with 180BH cold rolling bakings |
| CN113621883A (en) * | 2021-08-12 | 2021-11-09 | 上海宝钢新材料技术有限公司 | Lightweight automobile roof front cross beam lower plate, preparation method and front cross beam assembly |
| CN113621884A (en) * | 2021-08-12 | 2021-11-09 | 上海宝钢新材料技术有限公司 | Lightweight automobile roof rear cross beam lower plate, preparation method and rear cross beam assembly |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101814949B1 (en) | Hot-formed steel sheet member, and method for producing same | |
| CN110100032B (en) | Tempered martensitic steel having low yield ratio and excellent uniform elongation and method for producing same | |
| WO2014075404A1 (en) | High-formability and super-strength cold-rolled steel sheet and manufacturing method thereof | |
| CN104726766A (en) | Low-cost 260 MPa-level steel for automobile and production method thereof | |
| CN104498821B (en) | Medium-manganese high-strength steel for automobiles and production method thereof | |
| CN104195443A (en) | High-flexural-behavior hot-formed steel used for automobiles and manufacturing method thereof | |
| CN106350731A (en) | Cold-rolled high-strength steel plate with excellent phosphorization and formability and manufacturing method thereof | |
| CN102839329A (en) | Cold-rolling double-phase-steel steel plate with tensile strength of 450 MPa, and preparation method thereof | |
| KR101986876B1 (en) | Method for producing an ultra high strength material with high elongation | |
| JP4983082B2 (en) | High-strength steel and manufacturing method thereof | |
| JP2009173959A (en) | High-strength steel sheet and producing method therefor | |
| CN104294145A (en) | Bell-type annealing treatment-based cold rolled steel with tensile strength of 600MPa, and preparation method thereof | |
| CN103993147A (en) | Cold rolled steel plate and preparation method thereof | |
| KR101645840B1 (en) | Three-piece can and method for producing same | |
| CN103993226A (en) | High-strength cold rolled steel plate and preparing method thereof | |
| CN108823499B (en) | Thin cold-rolled annealed ultrahigh-strength steel and production method thereof | |
| CN104651715A (en) | Cold-rolled steel plate, preparation method of cold-rolled steel plate, hot-dip galvanized steel plate, and preparation method of hot-dip galvanized steel plate | |
| CN104213024A (en) | Ultra-low carbon high-strength steel produced by cover annealing and production method thereof | |
| CN103993227A (en) | Cold rolled steel plate and preparation method thereof | |
| CN107354376B (en) | Roll-forming 550MPa grades of cold-rolled steel sheets of yield strength and production method | |
| CN105779888A (en) | Hot-rolling production method for carbon structural steel | |
| CN109652625B (en) | Manufacturing process of ultrahigh-strength cold-rolled steel plate for automobile window | |
| CN102471821B (en) | Process for production of cold-rolled steel sheet having excellent press moldability, and cold-rolled steel sheet | |
| CN107513669A (en) | A kind of high-strength cold rolling square and rectangular pipe steel and its manufacture method | |
| CN103993225A (en) | Cold rolled steel plate and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150624 |