Production method of 440MPa-grade thin gauge hot-rolling pickling automobile sheet

A technology of hot-rolled pickling and production methods, which is applied in metal rolling and other directions, can solve the unfavorable automobile weight loss, surface quality, plate shape quality and coil performance stability that cannot meet the requirements of continuous batch stable stamping of auto parts , pickling plate thickness and other issues, to achieve the effect of less difficulty in process control, low cost, and stable roll-through performance

Active Publication Date: 2019-06-11
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with cold-rolled sheets, conventional pickling sheets are thicker, which is not conducive to weight loss of automobiles. At the same time, the stability of surface quality, shape quality, and coil performance cannot meet the requirements of continuous batch and stable stamping of auto parts.

Method used

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  • Production method of 440MPa-grade thin gauge hot-rolling pickling automobile sheet
  • Production method of 440MPa-grade thin gauge hot-rolling pickling automobile sheet
  • Production method of 440MPa-grade thin gauge hot-rolling pickling automobile sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] 1) In terms of weight percentage, the chemical composition of the billet is: C: 0.078, Si: 0.02, Mn: 1.12, P: 0.015, S: 0.009, Nb: 0.014, Als: 0.037, Ti: 0.021, N: 0.006, and The amount is Fe and unavoidable impurities. Its production process is: hot metal pre-desulfurization treatment → converter steelmaking → ladle LF refining → continuous casting;

[0055] The hot metal is desulfurized. After desulfurization, the sulfur content is lower than 0.008%, and the end point C of the converter is controlled at 0.06-0.08%. During the refining process, Al and Mn are adjusted in place and Nb and Ti are alloyed. After refining, calcium treatment is performed and soft stirring is performed for 10 minutes. , post-continuous casting, crystallizer liquid level fluctuations are controlled within ±2mm, slab thickness 220±2mm; slab heating→6-pass rough rolling→7-pass finish rolling→laminar cooling→coiling→levelling→pickling → Oiling → Finished product. After the steel billet is heate...

Embodiment 2

[0061] 1) In terms of weight percentage, the chemical composition of the billet is: C: 0.082, Si: 0.04, Mn: 1.16, P: 0.016, S: 0.012, Nb: 0.014, Als: 0.041, Ti: 0.015, N: 0.003, and The amount is Fe and unavoidable impurities. The production process is: pre-desulfurization treatment of molten iron → converter steelmaking → ladle LF refining → continuous casting; desulfurization of molten iron, after desulfurization, the sulfur content is lower than 0.008%, the end point C of the converter is controlled at 0.06-0.08%, Al, Mn After the adjustment is in place, carry out Nb and Ti alloying. After refining, carry out calcium treatment, and softly stir for 10 minutes, and then continue casting. The fluctuation of the crystallizer liquid level is controlled within ± 2mm, and the thickness of the slab is 220 ± 2mm; the slab is heated → 6 passes Sub-rough rolling → 7-pass finish rolling → laminar cooling → coiling → leveling → pickling → oiling → finished product. After the steel bill...

Embodiment 3

[0066] 1) In terms of weight percentage, the chemical composition of the billet is: C: 0.074, Si: 0.04, Mn: 1.05, P: 0.010, S: 0.011, Nb: 0.017, Als: 0.042, Ti: 0.025, N: 0.005, and The amount is Fe and unavoidable impurities. Its production process is: hot metal pre-desulfurization treatment → converter steelmaking → ladle LF refining → continuous casting;

[0067]The hot metal is desulfurized. After desulfurization, the sulfur content is lower than 0.008%, and the end point C of the converter is controlled at 0.06-0.08%. During the refining process, Al and Mn are adjusted in place and Nb and Ti are alloyed. After refining, calcium treatment is performed and soft stirring is performed for 10 minutes. , post-continuous casting, crystallizer liquid level fluctuations are controlled within ±2mm, slab thickness 220±2mm; slab heating→6-pass rough rolling→7-pass finish rolling→laminar cooling→coiling→levelling→pickling → Oiling → Finished product. After the steel billet is heated...

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Abstract

The invention discloses a production method of a 440MPa-grade thin gauge hot-rolling pickling automobile sheet. The hot-rolling pickling automobile sheet is prepared from the chemical element components in percentage by weight: C is 0.07-0.09, Si is less than or equal to 0.05, Mn is 1.00-1.20, P is less than or equal to 0.020, S is less than or equal to 0.020, Nb is 0.010-0.020, Als is 0.030-0.050, Ti is 0.010-0.030, N is less than or equal to 0.008, and the balances are Fe and unavoidable impurities. The preparation method sequentially includes the following steps of liquid iron pre-desulfuration processing, converter steel-making, steel ladle LF refining, continuous casting, casting blank heating, rough rolling, finish rolling, laminar flow cooling, high temperature coiling, skin rolling, pickling, rinsing, oil coating and coiling. According to the production method, the measures of low temperature heating, the rough rolling, high pressure dephosphorization before the finish rolling,dephosphorization before the rough rolling and between the finish rolling passes, and corrosion inhibitor adding in the pickling are adopted, and the surface quality of a steel coil is improved; andthe reduction rate of the finish rolling, the finishing rolling temperature, coiling temperature precision control and high temperature coiling are adopted, stability of a steel coil general rolling technology is ensured, and the strip shape quality and the performance general volume stability of the steel coil are improved.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to a production method of a 440MPa-level thin-gauge hot-rolled pickled automobile sheet. Background technique [0002] In 2017, my country's automobile output was 29.02 million, ranking first in the world for 9 consecutive years. The demand for various types of steel for automobiles is 78.25 million tons. In the huge demand, the current demand for pickling auto sheets is relatively small, because the thickness specification of pickling auto sheets on the market is currently 2-6mm, although there is a market for pickling auto sheets with thinner specifications However, limited by the production capacity of traditional hot rolling mills, the surface quality and performance uniformity of thin-gauge pickled automotive sheets are difficult to meet the needs of automated production in the automotive industry. In the future, pickling boards will develop towards thinner specificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/02C22C33/04C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C23G1/08
Inventor 岳重祥朱阳林宋乙峰张杰李化龙刘俭
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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