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Cold-rolled steel plate for structure with yield strength of 240 MPa level and preparation method

A technology of yield strength and cold-rolled steel plate, which is applied in the field of cold-rolled steel plate with a yield strength of 240MPa and its preparation, can solve the problems of low production efficiency and difficulty in guaranteeing the surface quality of the steel plate, and achieve reduction of alloy cost, reduction of Mn alloy content, The effect of increasing the carbon content

Inactive Publication Date: 2018-11-23
ZHANGJIAGANG YANGTZE RIVER COLD ROLLED PLATE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent adopts the bell annealing process, the production efficiency is low, and the surface quality of the steel plate is difficult to guarantee

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Raw material desulfurization, converter blowing and continuous casting have the following components (mass percentage): C, 0.17%; Mn, 0.55%; Si, 0.03%; P, 0.014%; S, 0.0046%; Als, 0.033%; The balance is Fe and unavoidable impurities;

[0026] The continuous casting billet is heated to 1200°C in a walking heating furnace, holding time is 150min, and the final rolling temperature is 860°C. The pre-cooling is adopted and the coiling temperature is 644°C to obtain a 4.5mm thick hot rolled steel coil;

[0027] After uncoiling, the hot-rolled coil is pickled and continuously rolled by a 5-stand rolling mill to obtain a 1.5mm thick rolled hard steel coil with a cold rolling reduction of 66.7%;

[0028] After the rolled hard steel coil is uncoiled, the steel plate enters the continuous annealing furnace after surface cleaning. The annealing soaking temperature is 745℃, and the soaking time is 85s; the outlet temperature of the slow cooling section is 685℃, and the cooling rate is 8℃ / s...

Embodiment 2

[0031] Raw material desulfurization, converter blowing and continuous casting have the following composition (mass percentage): C, 0.16%; Mn, 0.47%; Si, 0.04%; P, 0.015%; S, 0.0053%; Als, 0.033%; The balance is Fe and unavoidable impurities;

[0032] The continuous casting billet is heated to 1210°C in a walking heating furnace, the holding time is 160min, and the final rolling temperature is 855°C. The pre-cooling is adopted, and the coiling temperature is 638°C to obtain a 4.0mm thick hot rolled steel coil;

[0033] After uncoiling, the hot-rolled coils are pickled and continuously rolled through a 5-stand rolling mill to obtain 1.2mm thick rolled hard steel coils with a cold rolling reduction of 70%;

[0034] After the rolled hard steel coil is uncoiled, the steel plate enters the continuous annealing furnace after surface cleaning. The annealing soaking temperature is 745℃, and the soaking time is 70s; the outlet temperature of the slow cooling section is 685℃, and the cooling ra...

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Abstract

The invention discloses a cold-rolled steel plate for a structure with yield strength of 240 MPa level and a preparation method. The steel plate is prepared from the following chemical components in percentage by mass: 0.15 to 0.18% of C, 0.40 to 0.60% of Mn, less than or equal to 0.05% of Si, less than or equal to 0.02% of P, less than or equal to 0.01% of S, 0.02 to 0.06% of Als, and the balanceof Fe and other inevitable impurities. The cold-rolled steel plate has the advantages that the steel plate adopts a carbon-manganese component design, has yield strength of 240 to 340 MPa after beingannealed and flattened, has tensile strength of 390 to 480 MPa, and has specific elongation greater than or equal to 29%.

Description

Technical field [0001] The application belongs to the field of metallurgical technology, and particularly relates to a cold-rolled steel sheet for a structure with a yield strength of 240 MPa and a preparation method. Background technique [0002] The development of industries such as automobiles, home appliances, and construction has promoted the demand for all kinds of high-strength cold-rolled steel sheets. Among them, the cold-rolled structural steel with carbon-manganese composition has moderate strength, good formability, and relatively low production cost. It can be widely used Manufacture of internal structural parts of the car body, structural parts of home appliances, various steel pipes, etc. [0003] The main alloy components of carbon-manganese structural steel are C and Mn elements, and the strength of the steel plate is mainly improved by solid solution strengthening. At present, the carbon-manganese structural steel used in the manufacture of automobile bodies ofte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/06C22C38/02C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0236C21D8/0273C21D2211/005C22C38/02C22C38/04C22C38/06
Inventor 张志建陈刚刘志桥李化龙丁为国
Owner ZHANGJIAGANG YANGTZE RIVER COLD ROLLED PLATE CO LTD
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