CN102758071B - Continuous annealing production method for steel for 280 MPa vehicle structure - Google Patents
Continuous annealing production method for steel for 280 MPa vehicle structure Download PDFInfo
- Publication number
- CN102758071B CN102758071B CN201210200748.7A CN201210200748A CN102758071B CN 102758071 B CN102758071 B CN 102758071B CN 201210200748 A CN201210200748 A CN 201210200748A CN 102758071 B CN102758071 B CN 102758071B
- Authority
- CN
- China
- Prior art keywords
- steel
- temperature
- rolling
- continuous annealing
- calcium
- 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.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention relates to a continuous annealing production method for steel for a 280 MPa vehicle structure, belonging to the technical field of the production of metallurgical plates. The technical scheme comprises smelting, hot rolling, cold rolling and continuous annealing processes. The final chemical composition comprises the following components in percentage by mass: 0.145% to 0.185% of C, 0.05% to 0.15% of Si, 0.55% to 0.65% of Mn, less than or equal to 0.025% of P, less than or equal to 0.015% of S, 0.013% to 0.023% of Als, less than or equal to 0.004% of N, and Fe in balancing amount. In the smelting process, the blowing endpoint of a converter requires that: C is less than or equal to 0.10%, P is less than 0.015% and S is less than or equal to 0.035%. According to the continuous annealing production method, no microalloy element is added; the C content is increased by controlling the steel-making process so as to improve the yield strength and reduce the content of Si, Mn and P; the steel-making, hot rolling, cold rolling and continuous annealing processes are improved to produce the steel for the vehicle structure having a yield strength more than 280 MPa and an elongation of more than 30%; the obdurability is matched well; the cost is low; and the mechanical performance index of the finished product is as follows: the yield strength is about 300 MPa, the tensile strength is about 430 MPa, and the elongation is more than or equal to 30%.
Description
Technical field
The present invention relates to a kind of 280MPa level vehicle structure and move back production method with the company of steel, belong to metallurgical plate production technical field.
Background technology
At present, 280MPa level vehicle structure has CR260IF, B280VK, CR260/450DP etc. with the main trade mark of steel.The steel grade feature of these trades mark is that smelting difficulty is large, adds alloy more, causes production cost higher.First, CR260IF is high-strength phosphorous IF steel, and IF steel requires carbon content lower, and smelting cost is higher, by adding the non-metallic elements such as Si, P, improves intensity.Secondly, B280VK is used carbon aluminium-killed steel composition system, improve intensity, and Mn alloy price is higher, thereby has improved cost by adding Mn, P etc.The 3rd, CR260/450DP is dual phase steel, main by adding the element raising stabilization of austenites such as C, Mn, Si, thereby raising martensite transformation temperature, thus realize industrial production dual phase steel, because C, Mn, Si constituent content are higher, to equipment requirements high, production cost is higher.
Summary of the invention
The object of the invention is to provide a kind of 280MPa level vehicle structure and moves back production method with the company of steel, do not add any microalloy element, by controlling process for making, thereby improve C content and improve yield strength, reduce Si, Mn, P content, by improving steel-making, hot rolling, cold-rolling continuous annealing technique, produce yield strength and be greater than 280MPa, unit elongation higher than 30% auto sheet structural steel, obdurability matches, and cost is low, solves the problems referred to above that background technology exists.
Technical solution of the present invention is:
A kind of 280MPa level vehicle structure moves back production method with the company of steel, comprise smelting, hot rolling, cold-rolling continuous annealing operation, the mass percent of final chemical composition is: C:0.145～0.185%, Si:0.05～0.15, Mn:0.55～0.65, P≤0.025%, S≤0.015%, Als:0.013～0.023%, N≤0.004%, remains as Fe; In described smelting procedure, bessemerize terminal requirement: C≤0.10 %, P < 0.015%, S≤0.035%; During tapping to 30 ± 5%, to adding mass ratio in ladle, be that 0.4 ± 0.1% lime carries out pre-slag making, 5～8 minutes tapping time, during tapping, adopt floating plug and slag stop cone to carry out forward and backward pushing off the slag; Refining time is 35～65 minutes, refining adds Al-Mg-Ca-Fe alloy, lime is made white slag desulfurization operations, adjust basicity and the oxidisability of molten steel, LF stage molten steel basicity is controlled at 5～8, oxidisability: Oxygen Content in Liquid Steel≤30ppm, carries out desulfurization operations, the LF stage is when finish, S≤0.015%, process aluminium content is controlled at 250-350ppm, refining out-station temperature 1570-1590 ℃.
Process aluminium content is controlled at 250-350ppm, refining out-station temperature 1570-1590 ℃.
Described hot-rolled process, requires low-temperature heat, high-temperature final rolling, high temperature coiling: hot rolling Heating temperature is 1180-1220 ℃; Finish rolling start rolling temperature is 1050-1080 ℃, and finishing temperature is 850-890 ℃; Coiling temperature is 600-640 ℃; In course of hot rolling, roughing stay-warm case normally drops into, needless to say warm after roughing finishes.
Described cold-rolling continuous annealing operation, acid is rolled draft and is controlled at 60～80%; Even moving back soaking temperature is 690～720 ℃, soaking time 80～180s; Slow cooling final cooling temperature is 600-640 ℃; Aging temp is 400 ± 50 ℃, and aging time is 4～15min; Production belt speed is between 71～313m/min, and belt speed must be mated mutually with thickness; Smooth unit elongation is set as 0.6-2.0%, and smooth unit elongation must mate mutually with thickness.
In described smelting procedure, converter charging feedstock requires: converter enters stove molten iron S≤0.010%, desulfurizing iron, skims; Enter in stove steel scrap S≤0.020%, P≤0.050%, lipid≤0.002%, coating class≤0.005%, native sand≤0.5%, culled wood≤1.0%, adhesive water≤3.0%; Hot metal ratio >=86%.
Described smelting procedure, adopts converter smelting, and top bottom blowing operation adds the slag making of blowing of lime, light dolomite, and basicity of slag is controlled at 3.0-3.5; The composition of Al-Mg-Ca-Fe alloy by weight percentage composition is counted: Al:35%, and Mg:15%, Ca:50%, refining adopts LF stove refinery practice, and calcium is processed front molten steel and is required: S≤0.012%, Als=200-300ppm, T=1580-1600 ℃; With feeding silicon-calcium wire, carry out calcium processing operation, feed calcium line and must not feed aluminum steel in first 10 minutes, the recovery rate of calcium is 24% left and right, and departures calcium is controlled at 35-45ppm; Feed after aluminium calcium line, guarantee that the time of blowing is controlled at 6～15 minutes only, bottom blowing flow is as the criterion with liquid steel level fine motion, and LF refining departures carbon content control is 0.145～0.185%.
Positively effect of the present invention: the present invention does not add any microalloy element, by controlling process for making, thereby improve C content and improve yield strength, reduce Si, Mn, P content, by improving steel-making, hot rolling, cold-rolling continuous annealing technique, produce yield strength and be greater than 280MPa, unit elongation higher than 30% auto sheet structural steel, obdurability matches, and cost is low, finished product mechanical performance index: the about 300MPa of yield strength, the about 430MPa of tensile strength, unit elongation >=30%.
Embodiment
The invention will be further described by the following examples.
A kind of 280MPa level vehicle structure moves back production method with the company of steel, comprise smelting, hot rolling, cold-rolling continuous annealing operation, the mass percent of final chemical composition is: C:0.145～0.185%, Si:0.05～0.15, Mn:0.55～0.65, P≤0.025%, S≤0.015%, Als:0.013～0.023%, N≤0.004%, remains as Fe; In described smelting procedure, bessemerize terminal requirement: C≤0.10 %, P < 0.015%, S≤0.035%; During tapping to 30 ± 5%, to adding mass ratio in ladle, be that 0.4% lime carries out pre-slag making, 5～8 minutes tapping time, during tapping, adopt floating plug and slag stop cone to carry out forward and backward pushing off the slag; Refining time is: 35～65 minutes, refining added magnalium calcium iron, lime is made white slag desulfurization operations, and process aluminium content is controlled at 250-350ppm, refining out-station temperature 1570-1590 ℃.
Described hot-rolled process, requires low-temperature heat, high-temperature final rolling, high temperature coiling: hot rolling Heating temperature is 1180-1220 ℃; Finish rolling start rolling temperature is 1050-1080 ℃, and finishing temperature is 850-890 ℃; Coiling temperature is 600-640 ℃; In course of hot rolling, roughing stay-warm case normally drops into, needless to say warm after roughing finishes.
Described cold-rolling continuous annealing operation, acid is rolled draft and is controlled at 60～80%; Even moving back soaking temperature is 690～720 ℃, soaking time 80～180s; Slow cooling final cooling temperature is 600-640 ℃; Aging temp is 400 ± 50 ℃, aging time: 4～15min; Production belt speed is between 71～313m/min, and belt speed must be mated mutually with thickness; Smooth unit elongation is set as 0.6-2.0%, and smooth unit elongation must mate mutually with thickness.
In an embodiment, the chemical composition of steel is as shown in table 1.
Table 1 chemical composition
(chemical composition: wt%)
This time smelt totally 11 stoves, the embodiment 1 of take describes: converter packs desulphurised hot metal into as 272 tons.Basicity is controlled at 3.2.Bessemerize terminal composition: C:0.045 %, P:0.015%, S:0.011%.Tapping to three/is for the moment that 0.4% lime carries out pre-slag making to adding mass ratio in ladle; LF refining departures calcium is controlled at 43ppm, only blows 8 minutes time, and bottom blowing flow is as the criterion with liquid steel level fine motion, 1582 ℃ of refining out-station temperatures
Hot-rolled process: 1200 ± 20 ℃ of Heating temperatures, heat-up time about 40min, finish rolling start rolling temperature is 1050 ± 10 ℃, 870 ± 10 ℃ of finishing temperatures, 620 ± 10 ℃ of coiling temperatures; Hot-rolled finished product three volumes, reel number is 1～11, the corresponding 11 stove compositions of difference, trimmed size is two volume 1275 * 3.5mm.Concrete technology parameter is in Table 2.
Table 2 hot-rolled process parameter
The Heating temperature that the present invention is lower has guaranteed that continuous casting is cooled to the AlN forming in room temperature process and does not dissolve, lower coiling temperature will keep tiny AlN particle, tiny AlN particle is conducive to the ferritic crystal boundary of anchoring, is conducive to obtain tiny ferritic structure.
Cold-rolling continuous annealing operation: reel number is 1～11, corresponding 11 stove compositions respectively, acid is rolled trimmed size and is 1250 * 1.4mm, and cold rolling draft divides and is 60%.Concrete continuous annealing process is in Table 3.
Table 3 continuous annealing process
The smooth unit elongation of the present embodiment is set as 0.1%.
For keeping tiny hot rolling microstructure, avoid organizing thickly because annealing recrystallization causes, so annealing temperature is decided to be 710 ℃ of left and right, and can there is not austenite phase transformation by retainer belt steel in annealing at this temperature, and annealing is only adjusted ferrite grain size by recrystallize.Lower annealing temperature can also be avoided AlN slaking in annealing process, grows up, and reduces the anchoring ability of AlN to ferrite crystal grain, is conducive to obtain fine tissue.Along with the carrying out of aging section annealing, steel grade C content will form FeC precipitate gradually, and the C content of solid solution will reduce, and the aging section temperature reducing gradually is more conducive to separating out of FeC, reduce the C content of steel grade solid solution, improve the toughness of steel.
The present embodiment finished product mechanical property is in Table 4.
Table 4 mechanical property
In table 4, mechanical property surrender is greater than 280MPa, and tensile strength is greater than 410MPa, and unit elongation is greater than 30%, meets the demand of 280MPa level automobile steel completely.
Claims (1)
1. a 280MPa level vehicle structure moves back production method with the company of steel, it is characterized in that comprising smelting, hot rolling, cold-rolling continuous annealing operation, the mass percent of final chemical composition is: C:0.145～0.185%, Si:0.05～0.15, Mn:0.55～0.65, P≤0.025%, S≤0.015%, Als:0.013～0.023%, N≤0.004%, remains as Fe; In described smelting procedure, bessemerize terminal requirement: C≤0.10 %, P < 0.015%, S≤0.035%; During tapping to 30 ± 5%, to adding mass ratio in ladle, be that 0.4 ± 0.1% lime carries out pre-slag making, the tapping time is 5～8 minutes, adopts floating plug and slag stop cone to carry out forward and backward pushing off the slag during tapping; Refining time is 35～65 minutes, refining adds Al-Mg-Ca-Fe alloy, lime is made white slag, adjust basicity and the oxidisability of molten steel, LF stage molten steel basicity is controlled at 5～8, oxidisability: Oxygen Content in Liquid Steel≤30ppm, carries out desulfurization operations, the LF stage is when finish, S≤0.015%, process aluminium content is controlled at 250-350ppm, refining out-station temperature 1570-1590 ℃;
Described hot-rolled process, requires low-temperature heat, high-temperature final rolling, high temperature coiling: hot rolling Heating temperature is 1180-1220 ℃; Finish rolling start rolling temperature is 1050-1080 ℃, and finishing temperature is 850-890 ℃; Coiling temperature is 600-640 ℃; In course of hot rolling, roughing stay-warm case normally drops into, and after roughing finishes, at finish rolling entrance, by stop, does not treat that warm mode adjusts intermediate blank temperature;
Described cold-rolling continuous annealing operation, acid is rolled draft and is controlled at: 60～80%; Even moving back soaking temperature is 690～720 ℃, soaking time 80～180s; Slow cooling final cooling temperature is 600-640 ℃; Aging temp is 400 ± 50 ℃, aging time: 4～15min; Production belt speed is between 71～313m/min, and belt speed must be mated mutually with thickness; Smooth unit elongation is set as 0.6-2.0%, and smooth unit elongation must mate mutually with thickness;
Described smelting procedure, adopts converter smelting, and top bottom blowing operation adds the slag making of blowing of lime, light dolomite, and basicity of slag is controlled at 3.0-3.5; The composition of Al-Mg-Ca-Fe alloy by weight percentage composition is counted: Al:35%, and Mg:15%, Ca:50%, refining adopts LF stove refinery practice, and calcium is processed front molten steel and is required: S≤0.012%, Als=200-300ppm, T=1580-1600 ℃; With feeding silicon-calcium wire, carry out calcium processing operation, feed silicon-calcium wire and must not feed aluminum steel in first 10 minutes, the recovery rate of calcium is 24%, and departures calcium is controlled at 35-45ppm; Feed after aluminium calcium line, guarantee that the time of blowing is greater than 6 minutes only, bottom blowing flow is as the criterion with liquid steel level fine motion, and LF refining departures carbon content control is 0.145～0.185%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210200748.7A CN102758071B (en) | 2012-06-18 | 2012-06-18 | Continuous annealing production method for steel for 280 MPa vehicle structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210200748.7A CN102758071B (en) | 2012-06-18 | 2012-06-18 | Continuous annealing production method for steel for 280 MPa vehicle structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102758071A CN102758071A (en) | 2012-10-31 |
| CN102758071B true CN102758071B (en) | 2014-02-05 |
Family
ID=47052720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210200748.7A Expired - Fee Related CN102758071B (en) | 2012-06-18 | 2012-06-18 | Continuous annealing production method for steel for 280 MPa vehicle structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102758071B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105483520A (en) * | 2015-12-10 | 2016-04-13 | 苏州爱盟机械有限公司 | Automotive part material |
| CN108300845B (en) * | 2017-09-22 | 2021-04-20 | 新疆八一钢铁股份有限公司 | Rolling process of steel B280VK continuous casting billet for automobile structure |
| CN107893155B (en) * | 2017-10-31 | 2019-08-30 | 首钢集团有限公司 | Method for eliminating surface color difference defect of phosphorus-containing high-strength IF steel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1995431A (en) * | 2006-01-06 | 2007-07-11 | 鞍钢股份有限公司 | Method for producing ultra-fine grain steel plate by medium-thin slab continuous casting and rolling and steel plate |
| CN102174683A (en) * | 2011-01-30 | 2011-09-07 | 首钢总公司 | Method for producing cold-rolling low-carbon aluminum killed steel with uniform through plate mechanical property |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0673494A (en) * | 1992-08-28 | 1994-03-15 | Nippon Steel Corp | Steel sheet for working excellent in dent resistance and its production |
-
2012
- 2012-06-18 CN CN201210200748.7A patent/CN102758071B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1995431A (en) * | 2006-01-06 | 2007-07-11 | 鞍钢股份有限公司 | Method for producing ultra-fine grain steel plate by medium-thin slab continuous casting and rolling and steel plate |
| CN102174683A (en) * | 2011-01-30 | 2011-09-07 | 首钢总公司 | Method for producing cold-rolling low-carbon aluminum killed steel with uniform through plate mechanical property |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平6-73494A 1994.03.15 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102758071A (en) | 2012-10-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102162065B (en) | 550Mpa yield-strength low-carbon bainitic steel for engineering machinery and preparation method thereof | |
| CN102766748B (en) | Production method of low-temperature steel plate capable of being welded at high heat input | |
| CN109943778B (en) | 590 MPa-grade cold-rolled dual-phase steel with excellent hole expansion performance and production method thereof | |
| CN102758131B (en) | Production method of 600MPa grade cold rolling dual-phase steel | |
| CN106167875B (en) | A kind of strength and ductility product is more than 20GPa% economical high strength cold-rolled TRIP steel and preparation method thereof | |
| CN102758132B (en) | Method for manufacturing deep-drawing steel with high r value through continuous annealing of micro-carbon aluminum killed steel | |
| CN102758129B (en) | Method for manufacturing non-spangle galvanized sheet DX54D+Z from aluminum killed steel | |
| CN103361569A (en) | Ultralow temperature weather-proof structural steel plate and production method thereof | |
| CN103334050B (en) | Process utilizing sheet billet continuous casting to manufacture low aluminum silicon calm carbon structural steel | |
| CN109811267B (en) | One-steel multi-stage cold-rolled low-alloy high-strength steel with yield strength covering 300-340 Mpa grade and manufacturing method thereof | |
| CN109385576A (en) | A kind of inexpensive X65 pipe line steel and its manufacturing method based on magnesium processing | |
| CN104233064A (en) | 170MPa-grade cold-rolled phosphorized IF high-strength steel and production method thereof | |
| CN104928576A (en) | Production method of 260-330MPa low-alloy high-strength steel | |
| CN101294230B (en) | Duplex steelmaking technique of revolving furnace | |
| CN102268615B (en) | Engineering steel material with excellent core low-temperature impact toughness and lamellar tearing resisting performance and production method thereof | |
| CN107142426B (en) | A kind of superhigh intensity annealed sheet steel and its manufacturing method | |
| CN102758071B (en) | Continuous annealing production method for steel for 280 MPa vehicle structure | |
| CN102758128B (en) | Method for producing deep-draw hot-rolled strip steel by micro carbon aluminium killed steel | |
| CN105861929B (en) | A kind of 440MPa levels Cold Rolled High Strength IF Steel and its production method | |
| CN114645188A (en) | Method for efficiently producing hot-rolled steel strip for 2-4 mm extreme thin-specification high-quality stirring tank with tensile strength of 650MPa | |
| CN103498099A (en) | Thick-gauge steel plate with excellent low-temperature aging performance, and manufacturing method thereof | |
| CN113215499A (en) | Ultra-thick anti-seismic fire-resistant steel plate with 390 MPa-grade yield strength and manufacturing method thereof | |
| CN104328348B (en) | 800MPa level cold-rolled biphase steel and production method thereof | |
| CN114015931B (en) | Non-oriented electrical steel with excellent iron loss and magnetic property and production method thereof | |
| CN111926137B (en) | Preparation method for producing ship plate by adopting high-phosphorus, high-arsenic and high-sulfur molten iron |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140205 Termination date: 20180618 |