CN102758071A - 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
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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 working method, belong to the metallurgical plate production technical field with the company of steel.
Background technology
At present, 280MPa level vehicle structure has CR260IF, B280VK, CR260/450DP etc. with the main trade mark of steel.The steel grade characteristics of these trades mark are that the smelting difficulty is big, and it is more to add alloy, causes production cost higher.At first, CR260IF is high-strength phosphorous IF steel, and the IF steel requires carbon content lower, and smelting cost is higher, improves intensity through adding non-metallic elements such as Si, P.Secondly, B280VK uses carbon aluminium-killed steel composition system, improve intensity through adding Mn, P etc., and Mn alloy price is higher, thereby has improved cost.The 3rd, CR260/450DP is a dual phase steel, and is main through adding elements raising stabilization of austenites such as C, Mn, Si; Thereby the raising martensite transformation temperature, thus realize the industrial production dual phase steel, because C, Mn, Si constituent content are higher; To characteristics such as equipment requirements height, production cost is higher.
Summary of the invention
The object of the invention provides a kind of 280MPa level vehicle structure and moves back working method with the company of steel, does not add any microalloy element, through the control process for making; Thereby improve C content and improve ys, reduce Si, Mn, P content, through improving steel-making, hot rolling, cold rolling continuous annealing process; Produce ys and be higher than 30% auto sheet structural steel greater than 280MPa, unit elongation; Obdurability matches, and cost is low, solves the problems referred to above that background technology exists.
Technical scheme of the present invention is:
A kind of 280MPa level vehicle structure moves back working method with the company of steel, comprises smelting, hot rolling, cold rolling company and moves back operation, and the mass percent of final chemical ingredients 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 and is Fe; In the said smelting procedure, bessemerize terminal point requirement: C≤0.10 %, P＜0.015%, S≤0.035%; Tapping to 30 ± 5% o'clock, in ladle, adding mass ratio is that 0.4 ± 0.1% lime carries out preparatory slag making, 5～8 minutes tapping time, 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, and refining adds Al-Mg-Ca-Fe alloy, lime is made the white slag desulfurization operations, the basicity and the oxidisability of adjustment molten steel; LF stage molten steel basicity is controlled at 5～8, oxidisability: molten steel oxygen level≤30ppm, carry out desulfurization operations; The LF stage is when finishing; S≤0.015%, process aluminium content is controlled at 250-350ppm, 1570-1590 ℃ of refining out-station temperature.
Process aluminium content is controlled at 250-350ppm, 1570-1590 ℃ of refining out-station temperature.
Said hot-rolled process requires low-temperature heat, high-temperature final rolling, and high temperature batches: the hot rolling Heating temperature is 1180-1220 ℃; The finish rolling start rolling temperature is 1050-1080 ℃, and finishing temperature is 850-890 ℃; Coiling temperature is 600-640 ℃; In the course of hot rolling, the roughing stay-warm case normally drops into, and is needless to say warm after roughing finishes.
Operation is moved back by said cold rolling company, and acid is rolled draft and is controlled at 60～80%; Even moving back soaking temperature is 690～720 ℃, soaking time 80～180s; The slow cooling final cooling temperature is 600-640 ℃; Aging temp is 400 ± 50 ℃, and aging time is 4～15min; The production belt speed is between 71～313m/min, and belt speed and thickness is coupling each other; Smooth unit elongation is set at 0.6-2.0%, and smooth unit elongation must mate with thickness each other.
In the said smelting procedure, the converter charging feedstock requires: stove molten iron S≤0.010% is gone in converter, desulfurizing iron, skims; Go in the stove steel scrap S≤0.020%, P≤0.050%, oils≤0.002%, coating class≤0.005%, native sand≤0.5%, culled wood≤1.0%, adhesive water≤3.0%; Hot metal ratio>=86%.
Said smelting procedure adopts converter smelting, and the 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 is counted by the quality percentage composition: Al:35%, and Mg:15%, Ca:50%, LF stove refinery practice is adopted in refining, and molten steel required before calcium was handled: S≤0.012%, Als=200-300ppm, T=1580-1600 ℃; Carry out calcium processing operation with feeding silicon-calcium wire, feed calcium line and must not feed aluminum steel in preceding 10 minutes, the yield of calcium is about 24%, and departures calcium is controlled at 35-45ppm; After feeding the aluminium calcium line, guarantee that the time of blowing was controlled at 6～15 minutes only, the bottom blowing flow is as the criterion with the liquid steel level fine motion, and LF refining departures carbon content is controlled at 0.145～0.185%.
Positively effect of the present invention: the present invention does not add any microalloy element, through the control process for making, improves ys thereby improve C content; Reduce Si, Mn, P content,, produce ys and be higher than 30% auto sheet structural steel greater than 280MPa, unit elongation through improving steel-making, hot rolling, cold rolling continuous annealing process; Obdurability matches, and cost is low, the finished product mechanical performance index: the about 300MPa of ys; The about 430MPa of tensile strength, unit elongation >=30%.
Embodiment
Below through embodiment the present invention is described further.
A kind of 280MPa level vehicle structure moves back working method with the company of steel, comprises smelting, hot rolling, cold rolling company and moves back operation, and the mass percent of final chemical ingredients 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 and is Fe; In the said smelting procedure, bessemerize terminal point requirement: C≤0.10 %, P＜0.015%, S≤0.035%; Tapping to 30 ± 5% o'clock, in ladle, adding mass ratio is that 0.4% lime carries out preparatory slag making, the tapping time adopted floating plug and slag stop cone to carry out forward and backward pushing off the slag greater than 5～8 minutes during tapping; Refining time is: 35～65 minutes, refining added magnalium calcium iron, lime is made the white slag desulfurization operations, and process aluminium content is controlled at 250-350ppm, 1570-1590 ℃ of refining out-station temperature.
Said hot-rolled process requires low-temperature heat, high-temperature final rolling, and high temperature batches: the hot rolling Heating temperature is 1180-1220 ℃; The finish rolling start rolling temperature is 1050-1080 ℃, and finishing temperature is 850-890 ℃; Coiling temperature is 600-640 ℃; In the course of hot rolling, the roughing stay-warm case normally drops into, and is needless to say warm after roughing finishes.
Operation is moved back by said cold rolling company, and acid is rolled draft and is controlled at 60～80%; Even moving back soaking temperature is 690～720 ℃, soaking time 80～180s; The slow cooling final cooling temperature is 600-640 ℃; Aging temp is 400 ± 50 ℃, aging time: 4～15min; The production belt speed is between 71～313m/min, and belt speed and thickness is coupling each other; Smooth unit elongation is set at 0.6-2.0%, and smooth unit elongation must mate with thickness each other.
In an embodiment, the chemical ingredients of steel is as shown in table 1.
Table 1 chemical ingredients
(chemical ingredients: wt%)
This time smelt totally 11 stoves, describe with embodiment 1: the converter desulphurised hot metal of packing into is 272 tons.Basicity is controlled at 3.2.Bessemerize the terminal point composition: C:0.045 %, P:0.015%, S:0.011%.Tapping to three/for the moment, in ladle, adding mass ratio is that 0.4% lime carries out preparatory slag making; LF refining departures calcium is controlled at 43ppm, blows 8 minutes time only, and the bottom blowing flow is as the criterion with the liquid steel level fine motion, 1582 ℃ of refining out-station temperatures
Hot-rolled process: 1200 ± 20 ℃ of Heating temperatures, heat-up time about 40min, the 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 are two volumes, 1275 * 3.5mm.Concrete processing parameter is seen 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 that forms in the room temperature process and does not dissolve; Lower coiling temperature will keep tiny AlN particle; Tiny AlN particle helps the ferritic crystal boundary of anchoring, helps obtaining tiny ferritic structure.
Operation is moved back by cold rolling company: reel number is 1～11, the corresponding 11 stove compositions of difference, and acid rolls into the article specification and is 1250 * 1.4mm, and cold rolling draft branch is 60%.Concrete continuous annealing process is seen table 3.
Table 3 continuous annealing process
The smooth unit elongation of present embodiment is set at 0.1%.
For keeping tiny hot rolling microstructure, to avoid because annealing recrystallization causes and organizes thickly, so annealing temperature is decided to be about 710 ℃, and annealing can austenite phase transformation not take place the retainer belt steel under this temperature, annealing is only through recrystallize adjustment ferrite grain size.Lower annealing temperature can also avoid AlN in the annealing process matured, grows up, and reduces the anchoring ability of AlN to ferrite crystal grain, helps obtaining fine tissue.Along with timeliness section annealed carries out, steel grade C content will form the FeC precipitate gradually, and the C content of solid solution will reduce, and the timeliness section temperature that reduces gradually more helps separating out of FeC, reduce the C content of steel grade solid solution, improve the toughness of steel.
Present embodiment finished product mechanical property is seen table 4.
Table 4 mechanical property
The mechanical property surrender is greater than 280MPa in the table 4, and tensile strength is greater than 410MPa, and unit elongation satisfies the demand of 280MPa level automobile steel fully greater than 30%.
Claims (4)
1. a 280MPa level vehicle structure moves back working method with the company of steel, it is characterized in that comprising smelting, hot rolling, cold rolling company and moves back operation, and the mass percent of final chemical ingredients 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 and is Fe; In the said smelting procedure, bessemerize terminal point requirement: C≤0.10 %, P＜0.015%, S≤0.035%; Tapping to 30 ± 5% o'clock, in ladle, adding mass ratio is that 0.4 ± 0.1% lime carries out preparatory slag making, the tapping time adopted floating plug and slag stop cone to carry out forward and backward pushing off the slag greater than 5～8 minutes during tapping; Refining time is 35～65 minutes, and refining adds Al-Mg-Ca-Fe alloy, lime is made white slag, the basicity and the oxidisability of adjustment molten steel; LF stage molten steel basicity is controlled at 5～8, oxidisability: molten steel oxygen level≤30ppm, carry out desulfurization operations; The LF stage is when finishing; S≤0.015%, process aluminium content is controlled at 250-350ppm, 1570-1590 ℃ of refining out-station temperature.
2. move back working method according to the said a kind of 280MPa level vehicle structure of claim 1 with the company of steel, it is characterized in that said hot-rolled process, require low-temperature heat, high-temperature final rolling, high temperature batches: the hot rolling Heating temperature is 1180-1220 ℃; The finish rolling start rolling temperature is 1050-1080 ℃, and finishing temperature is 850-890 ℃; Coiling temperature is 600-640 ℃; In the course of hot rolling, the roughing stay-warm case normally drops into, and roughing finishes the back and do not treat that through stop the mode of temperature adjusts the intermediate blank temperature at the finish rolling inlet.
3. move back working method according to claim 1 or 2 said a kind of 280MPa level vehicle structures with the company of steel, it is characterized in that said cold rolling company moves back operation, acid is rolled draft and is controlled at: 60～80%; Even moving back soaking temperature is 690～720 ℃, soaking time 80～180s; The slow cooling final cooling temperature is 600-640 ℃; Aging temp is 400 ± 50 ℃, aging time: 4～15min; The production belt speed is between 71～313m/min, and belt speed and thickness is coupling each other; Smooth unit elongation is set at 0.6-2.0%, and smooth unit elongation must mate with thickness each other.
4. move back working method according to claim 1 or 2 said a kind of 280MPa level vehicle structures with the company of steel; It is characterized in that said smelting procedure, adopt converter smelting, the top bottom blowing operation; Add the slag making of blowing of lime, light dolomite, basicity of slag is controlled at 3.0-3.5; The composition of Al-Mg-Ca-Fe alloy is counted by the quality percentage composition: Al:35%, and Mg:15%, Ca:50%, LF stove refinery practice is adopted in refining, and molten steel required before calcium was handled: S≤0.012%, Als=200-300ppm, T=1580-1600 ℃; Carry out calcium processing operation with feeding silicon-calcium wire, feed calcium line and must not feed aluminum steel in preceding 10 minutes, the yield of calcium is about 24%, and departures calcium is controlled at 35-45ppm; After feeding the aluminium calcium line, guarantee to blow the time only greater than 6 minutes, the bottom blowing flow is as the criterion with the liquid steel level fine motion, and LF refining departures carbon content is controlled at 0.145～0.185%.
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Cited By (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 |
| CN107893155A (en) * | 2017-10-31 | 2018-04-10 | 首钢集团有限公司 | Method for eliminating surface color difference defect of phosphorus-containing high-strength IF steel |
| CN108300845A (en) * | 2017-09-22 | 2018-07-20 | 新疆八钢铁股份有限公司 | Vehicle structure steel B280VK continuous casting billet milling techniques |
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| JPH0673494A (en) * | 1992-08-28 | 1994-03-15 | Nippon Steel Corp | Steel sheet for working excellent in dent resistance and its production |
| 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 |
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2012
- 2012-06-18 CN CN201210200748.7A patent/CN102758071B/en not_active Expired - Fee Related
Patent Citations (3)
| 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 |
| 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 |
Cited By (4)
| 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 |
| CN108300845A (en) * | 2017-09-22 | 2018-07-20 | 新疆八钢铁股份有限公司 | Vehicle structure steel B280VK continuous casting billet milling techniques |
| CN107893155A (en) * | 2017-10-31 | 2018-04-10 | 首钢集团有限公司 | Method for eliminating surface color difference defect of phosphorus-containing high-strength IF steel |
| 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 |
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