CN102925796A - Non-alloyed ultra-low carbon structure cold-rolled sheet and production method thereof - Google Patents
Non-alloyed ultra-low carbon structure cold-rolled sheet and production method thereof Download PDFInfo
- Publication number
- CN102925796A CN102925796A CN2012104253310A CN201210425331A CN102925796A CN 102925796 A CN102925796 A CN 102925796A CN 2012104253310 A CN2012104253310 A CN 2012104253310A CN 201210425331 A CN201210425331 A CN 201210425331A CN 102925796 A CN102925796 A CN 102925796A
- Authority
- CN
- China
- Prior art keywords
- cold
- temperature
- rolling
- low carbon
- ultra
- 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.)
- Granted
Links
Images
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention relates to the rolling field of automobile steel plates, and in particular relates to a production method of a non-alloyed ultra-low carbon structure cold-rolled sheet. The production method is characterized in that the steel comprises the chemical components by weight percent: 0.0020-0.0060% of C, less than or equal to 0.10% of Si, 0.30-0.80% of Mn, 0.030-0.080% of P, 0.010-0.025% of S, 0.020-0.060% of ALS, 0.0003-0.0005% of Bs and the balance of Fe and unavoidable impurities. Compared with the prior art, the production method has the advantages that 1) niobium-titanium alloy is omitted, and solution strengthening function of C, P and the like is applied, so that the cost is greatly lowered; and 2) the yield strength and the yield strength of ultra-low carbon steel are improved, the ultra-low carbon steel is guaranteed to have good deep drawing performance, and the produced cold-rolled sheet has high strength and good shaping property so as to meet the using aim of the automobile industry.
Description
Technical field
The present invention relates to the rolling field of automotive sheet, particularly a kind of no-alloyed Ultra-low carbon structure cold-reduced sheet and production method thereof.
Background technology
In the Ultra-low carbon product of Hyundai Motor steel plate, generally all add an amount of niobium or titanium alloy and come C, N in the sublimate steel, improve the formed product performance.The IF steel is gapless atomic steel, have low-yield, low yield strength ratio, yield strength≤190MPa, the characteristics of traditional ultra low-carbon steel be carbon content extremely low≤0.004%, has very strong deformability, prevent the ram-type cracking, require to have simultaneously good r value and n value, with smooth surface after the assurance moulding.21st century, world energy sources was supplied with growing tension, and for alleviating the consumption to the energy of automobile, the while does not affect the security requirement of automobile, and the automobile of high-strength light becomes main flow.
European standard EN10268-2006 proposes a series of Secretaries to the production technology of autobody sheet, wherein HC220Y trade mark steel requires steel plate when having good super deep drawability, structural part and reinforcing member as automobile will have high-strength impact-resistant, both " high strength and ductility ", require ultra low-carbon steel to have high yield strength (σ s=220～270MPa), high-tensile (Rm=350～420MPa), deep drawability (r=1.6～2.2, n=0.18～0.25), good ductility (A80 〉=34%, A50 〉=40%).
Generally adopt to add phosphorus and silicon or manganese in the IF steel, require it to have good mechanical property, and have good anti-secondary processing brittleness, chemical treatment properties and the zinc-plated adaptability of alloying, yield range is very little simultaneously, requires product to have very high stability.General high-strength steel adds niobium titanium alloy when adopting phosphorus as main strengthening element, though close technique is at home and abroad arranged, implementation has obvious difference, and the unit elongation of the method can't satisfy user's demand.
Summary of the invention
The purpose of this invention is to provide a kind of no-alloyed Ultra-low carbon structure cold-reduced sheet and production method thereof, strengthening effect with niobium and titanium in the alternative ultra low-carbon steel of P, make steel plate when having good super deep drawability, have high-strength impact-resistant, satisfy as the structural part of automobile and the performance requriements of reinforcing member.
For achieving the above object, the present invention realizes by the following technical solutions:
The thin brilliant Ultra-low carbon structure cold-reduced sheet of a kind of no-alloyed, the chemical composition of steel is by weight percentage: C 0.0020%～0.0060%, Si≤0.10%, Mn 0.30%～0.80%, P 0.030%～0.080%, S 0.010%～0.025%, AL
S0.020%～0.060%, Bs 0.0003%～0.0005%, and surplus is Fe and inevitable impurity.
The thin brilliant Ultra-low carbon structure of above-mentioned a kind of no-alloyed comprises smelting, continuous casting, hot rolling, cold-rolling pickling, continuous annealing, smooth with the production method of cold-reduced sheet, and the concrete technology parameter is:
1) hot rolling:
Billet heating temperature: 1200～1300 ℃;
Roughing temperature out: 1050～1150 ℃;
Finish rolling start rolling temperature: 1050～1150 ℃;
Hot rolling finishing temperature: 850～930 ℃;
Coiler plate temperature: 580～620 ℃;
2) cold rolling: cold rolling draft: 73～87%;
3) continuous annealing: connect and move back 3～4 ℃/s of temperature rise rate;
Annealing temperature: 820～840 ℃;
Soaking time: 90～130s;
Slow cooling section temperature: 600～550 ℃;
Slow cooling speed: 35～50 ℃/s;
Fast cold section temperature: 400～300 ℃;
Fast cooling rate rate: 35～50 ℃/s;
4) smooth unit elongation: 0.4%～2.0%.
On steel ultra low-carbon steel C≤0.010% basis, increase P content, improve surrender and the tensile strength of ultra low-carbon steel, guarantee that simultaneously it has good deep draw performance, by optimizing the carbon content in the steel, the intensity of the raising steel such as alloying element Mn, Si that interpolation can be strengthened is avoided the secondary processing brittleness of steel, and the simultaneously adding of boron suppresses the secondary processing brittleness of P.
Utilize hot rolling low temperature coiling technique to avoid the formation of FePTi, prevent that it is to the destruction of stampability and high-elongation, avoided because of the two-phase particle inhibition of crystal boundary being improved unit elongation by pure carbon element no-alloyed simultaneously, adjust the cold-rolling process soaking temperature up to making product have { the 111} texture of higher strong punching press more than 820 degree, utilize simultaneously high polishing draft to obtain high tensile strength and yield strength, to guarantee plasticity and the shock resistance of steel.
Compared with prior art, the invention has the beneficial effects as follows:
1) solution strengthening effects such as C, P are used in the adding of cancellation niobium titanium alloy, and the ultra low-carbon steel that adopts high Mn is as main component, P and Mn element are distributed with the effect of crystal grain thinning at grain boundaries, adjusting process makes refined crystalline strengthening, greatly reduces cost and effect stability.
2) improve surrender and the tensile strength of ultra low-carbon steel, guaranteed that simultaneously it has good deep draw performance, produced and namely have high intensity and have again good forming property, satisfied the application target of automotive industry.
Description of drawings
Fig. 1 is continuous annealing process figure of the present invention;
Fig. 2 is cold-rolled products metallograph of the present invention.
Embodiment
The present invention is further described below in conjunction with embodiment:
The thin brilliant Ultra-low carbon structure cold-reduced sheet of a kind of no-alloyed of the present invention, the chemical composition of steel is by weight percentage: C 0.0020%～0.0060%, Si≤0.10%, Mn 0.30%～0.80%, P 0.030%～0.080%, S 0.010%～0.025%, AL
S0.020%～0.060%, Bs 0.0003%～0.0005%, and surplus is Fe and inevitable impurity.Wherein Bs is sour molten boron.
The thin brilliant Ultra-low carbon structure of a kind of no-alloyed comprises smelting, continuous casting, hot rolling, cold-rolling pickling, continuous annealing, smooth with the production method of cold-reduced sheet, and its concrete technology parameter is:
1) hot rolling:
Billet heating temperature: 1200～1300 ℃;
Roughing temperature out: 1050～1150 ℃;
Finish rolling start rolling temperature: 1050～1150 ℃;
Hot rolling finishing temperature: 850～930 ℃;
Coiler plate temperature: 580～620 ℃;
2) cold rolling: cold rolling draft: 73～87%;
3) see Fig. 1, continuous annealing process figure of the present invention: connect and move back 3～4 ℃/s of temperature rise rate;
Annealing temperature: 820～840 ℃;
Soaking time: 90～130s;
Slow cooling section temperature: 600～550 ℃;
Slow cooling speed: 35～50 ℃/s;
Fast cold section temperature: 400～300 ℃;
Fast cooling rate rate: 35～50 ℃/s;
4) smooth unit elongation: 0.4%～2.0%.
Seeing Fig. 2, is cold-rolled products metallograph of the present invention, and cold-rolled products performance test effect of the present invention sees Table 1:
Table 1
| Unit elongation A 50 | Yield strength | Tensile strength | R is average | N is average |
| 40～45 | 222～260 | 350～370 | 1.89～2.1 | 0.19～0.22 |
The present invention has satisfied high yield strength (σ s=220～270MPa), the tensile strength (350～420MPa) of the ultra low-carbon steel that is used for automobile structure and reinforcing member of European EN10268-2006 standard fully, deep drawability (r=1.6～2.2, n=0.18～0.25), the requirement of good ductility (δ 〉=34%).
Owing in steel, not adding the alloys such as Nb or Ti, there is not precipitation strength, the C of Main Basis, Mn, P, N exist in steel with the form of solid solution, so that product has very high intensity, produce and namely have high intensity and have again good forming property, can satisfy the thin brilliant Ultra-low carbon structural steel of no-alloyed of the super deep-draw needs of automotive industry.
Claims (2)
1. thin brilliant Ultra-low carbon structure cold-reduced sheet of no-alloyed, it is characterized in that, the chemical composition of steel is by weight percentage: C 0.0020%～0.0060%, Si≤0.10%, Mn 0.30%～0.80%, P 0.030%～0.080%, S 0.010%～0.025%, AL
S0.020%～0.060%, Bs 0.0003%～0.0005%, and surplus is Fe and inevitable impurity.
2. the production method of the thin brilliant Ultra-low carbon structure usefulness cold-reduced sheet of no-alloyed comprises smelting, continuous casting, hot rolling, cold-rolling pickling, continuous annealing, smooth, it is characterized in that, the concrete technology parameter is:
1) hot rolling:
Billet heating temperature: 1200～1300 ℃;
Roughing temperature out: 1050～1150 ℃;
Finish rolling start rolling temperature: 1050～1150 ℃;
Hot rolling finishing temperature: 850～930 ℃;
Coiler plate temperature: 580～620 ℃;
2) cold rolling: cold rolling draft: 73～87%;
3) continuous annealing: connect and move back 3～4 ℃/s of temperature rise rate;
Annealing temperature: 820～840 ℃;
Soaking time: 90～130s;
Slow cooling section temperature: 600～550 ℃;
Slow cooling speed: 35～50 ℃/s;
Fast cold section temperature: 400～300 ℃;
Fast cooling rate rate: 35～50 ℃/s;
4) smooth unit elongation: 0.4%～2.0%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210425331.0A CN102925796B (en) | 2012-10-30 | 2012-10-30 | Non-alloyed ultra-low carbon structure cold-rolled sheet and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210425331.0A CN102925796B (en) | 2012-10-30 | 2012-10-30 | Non-alloyed ultra-low carbon structure cold-rolled sheet and production method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102925796A true CN102925796A (en) | 2013-02-13 |
| CN102925796B CN102925796B (en) | 2014-07-09 |
Family
ID=47640719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210425331.0A Active CN102925796B (en) | 2012-10-30 | 2012-10-30 | Non-alloyed ultra-low carbon structure cold-rolled sheet and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102925796B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103789608A (en) * | 2014-02-11 | 2014-05-14 | 河北钢铁股份有限公司邯郸分公司 | Cold-based ultra-high strength galvanized sheet for structures and production method thereof |
| CN109440005A (en) * | 2018-11-14 | 2019-03-08 | 河钢股份有限公司承德分公司 | A kind of SAPH440 crystal grain refinement steel and its production method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000034542A1 (en) * | 1998-12-07 | 2000-06-15 | Nkk Corporation | High strength cold rolled steel plate and method for producing the same |
| CN101096034A (en) * | 2006-06-27 | 2008-01-02 | 鞍钢股份有限公司 | Production method of ultra-low-carbon steel for sedan car cortical plate |
| CN101171355A (en) * | 2005-05-03 | 2008-04-30 | Posco公司 | Cold rolled steel sheet having high yield ratio and less anisotropy, process for producing the same |
| CN101348883A (en) * | 2008-09-11 | 2009-01-21 | 北京科技大学 | Niobium and titanium composite added ultra-low carbon baking hardening steel plate and manufacturing method thereof |
| CN101684533A (en) * | 2008-09-27 | 2010-03-31 | 鞍钢股份有限公司 | High strength cold-rolled plate with excellent formability and production method thereof |
| CN102199727A (en) * | 2011-05-17 | 2011-09-28 | 马鞍山钢铁股份有限公司 | 400MPa high-strength and high-forming-performance cold rolled steel plate and production method thereof |
| CN102409225A (en) * | 2010-09-21 | 2012-04-11 | 鞍钢股份有限公司 | High-strength superfine grain cold rolling IF (Interstitial Free) steel and production method thereof |
| CN102644023A (en) * | 2012-04-23 | 2012-08-22 | 武汉钢铁(集团)公司 | Steel containing P and used for intermediate frequency (IF) automotive panel and production method thereof |
| CN102719740A (en) * | 2012-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Method for producing ultra-low carbon high-strength cold rolling sheet |
| CN102747281A (en) * | 2012-07-31 | 2012-10-24 | 首钢总公司 | Batch annealing interstitial-free (IF) steel and production method thereof |
-
2012
- 2012-10-30 CN CN201210425331.0A patent/CN102925796B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000034542A1 (en) * | 1998-12-07 | 2000-06-15 | Nkk Corporation | High strength cold rolled steel plate and method for producing the same |
| CN101171355A (en) * | 2005-05-03 | 2008-04-30 | Posco公司 | Cold rolled steel sheet having high yield ratio and less anisotropy, process for producing the same |
| CN101096034A (en) * | 2006-06-27 | 2008-01-02 | 鞍钢股份有限公司 | Production method of ultra-low-carbon steel for sedan car cortical plate |
| CN101348883A (en) * | 2008-09-11 | 2009-01-21 | 北京科技大学 | Niobium and titanium composite added ultra-low carbon baking hardening steel plate and manufacturing method thereof |
| CN101684533A (en) * | 2008-09-27 | 2010-03-31 | 鞍钢股份有限公司 | High strength cold-rolled plate with excellent formability and production method thereof |
| CN102409225A (en) * | 2010-09-21 | 2012-04-11 | 鞍钢股份有限公司 | High-strength superfine grain cold rolling IF (Interstitial Free) steel and production method thereof |
| CN102199727A (en) * | 2011-05-17 | 2011-09-28 | 马鞍山钢铁股份有限公司 | 400MPa high-strength and high-forming-performance cold rolled steel plate and production method thereof |
| CN102719740A (en) * | 2012-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Method for producing ultra-low carbon high-strength cold rolling sheet |
| CN102644023A (en) * | 2012-04-23 | 2012-08-22 | 武汉钢铁(集团)公司 | Steel containing P and used for intermediate frequency (IF) automotive panel and production method thereof |
| CN102747281A (en) * | 2012-07-31 | 2012-10-24 | 首钢总公司 | Batch annealing interstitial-free (IF) steel and production method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103789608A (en) * | 2014-02-11 | 2014-05-14 | 河北钢铁股份有限公司邯郸分公司 | Cold-based ultra-high strength galvanized sheet for structures and production method thereof |
| CN109440005A (en) * | 2018-11-14 | 2019-03-08 | 河钢股份有限公司承德分公司 | A kind of SAPH440 crystal grain refinement steel and its production method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102925796B (en) | 2014-07-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104498821B (en) | Medium-manganese high-strength steel for automobiles and production method thereof | |
| CN101348884B (en) | 440MPa grade niobium-containing high-strength IF steel and manufacturing method thereof | |
| CN106282831B (en) | A kind of high-strength container weather resisting steel and its manufacturing method | |
| CN104593674A (en) | Hot-dip galvanized ultra-low carbon bake-hardening steel and production method thereof | |
| CN102021472A (en) | Production method for continuous annealing process high strength and plasticity product automobile steel plate | |
| CN105274432A (en) | 600 MPa grade high-yield-ratio high-plasticity cold-rolled steel plate and manufacturing method thereof | |
| CN111218620B (en) | High-yield-ratio cold-rolled dual-phase steel and manufacturing method thereof | |
| CN103103438B (en) | High-strength and high-plasticity medium manganese cold-roll steel sheet and manufacturing method thereof | |
| CN108796363A (en) | The great surface quality for adapting to large deformation and punch process covers aluminum substrate steel and its production method | |
| CN105483545A (en) | 800MPa level hot-rolling high broaching steel plate and manufacturing method thereof | |
| CN102719740A (en) | Method for producing ultra-low carbon high-strength cold rolling sheet | |
| CN102676927A (en) | High-Ti micro-alloyed medium thickness steel plate and preparation method thereof | |
| CN102653839A (en) | Low-temperature continuous-annealing interstitial-free atom cold-rolled steel plate and production method thereof | |
| CN103074546A (en) | Cold-rolled strip steel for condenser tube of refrigerator and manufacturing method thereof | |
| CN103602884A (en) | Ultralow-carbon aluminum-killed steel plate and production method thereof | |
| CN104561788B (en) | Phosphorus-containing high-strength interstitial-free steel and production method thereof | |
| CN105695870A (en) | thick hot rolled sheet steel with 450MPa grade yield strength and manufacturing method thereof | |
| CN105506476A (en) | 600 MPa-grade highly-chambered steel plate for automotive chassis and manufacturing method thereof | |
| CN105401090A (en) | Cold-rolled steel sheet for automobile-seat-adjusting toothed plate produced through precision stamping and manufacturing method of cold-rolled steel sheet | |
| CN101497959B (en) | Cold rolling baking hardened steel with yield strength 220MPa and production method thereof | |
| CN109680130A (en) | A kind of high strength and ductility cold rolling medium managese steel and preparation method thereof | |
| CN103667649B (en) | A kind of Nb process pot galvanize ultra-low carbon baking hardening steel plate and manufacture method thereof | |
| CN109207847B (en) | Low-carbon equivalent high-hole-expansion-rate 1180 MPa-grade cold-rolled steel plate and manufacturing method thereof | |
| CN102286696B (en) | Preparation method of extra-deep drawing dual-phase steel with high plastic strain ratio | |
| CN103556052A (en) | Automotive high manganese steel and manufacturing 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 | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |