400 MPa-tensile-strength high-strength carbon-manganese constructional steel and manufacturing method thereof

A technology of tensile strength and manufacturing method, which is applied in the field of high-strength carbon-manganese structural steel with a tensile strength of 400 MPa and its manufacturing field, can solve the problems of inability to produce products with specifications above 2.5mm, high manufacturing cost, and difficulty in assembly, and achieves Large production capacity, lower production cost, and obvious cooling effect

Active Publication Date: 2014-01-15
MAGANG (GROUP) HOLDING CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production process has the following disadvantages: ①It is impossible to produce products with specifications above 2.5mm
②Group production is limited by thickness, width, annealing temperature, etc., and group production is difficult
③High manufacturing cost
[0007] The Chinese patent number is CN201110126624.4, which is produced by ultra-low carbon IF steel. The steel produced by it meets the requirements of high-strength steel plate with deep drawing formability, but it needs vacuum degassing and refining, and the cost is high; and a higher P content is added. In addition, there is no interstitial atom C in the grain boundary, and the grain boundary is relatively fragile, which is prone to low temperature brittleness and secondary processing brittleness
Chinese Patent No. CN201010130903.3 adopts thin strip continuous casting technology to obtain bainite structure with poor formability

Method used

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Comparison scheme
Effect test

specific Embodiment 1

[0044] Chemical composition (mass percentage) of steel C: 0.12%, Mn: 0.38%, Si: 0.22%, P: 0.010%, S: 0.011%, Al: 0.013%, and the balance is iron and unavoidable impurities.

[0045] Its technological process is: converter smelting → continuous casting → hot rolling → pickling cold rolling → bell annealing → smoothing → finished product.

[0046] Process parameters: Carry out converter smelting according to the above composition, and continuously cast into 230mm thick slab, then heat the slab to 1230°C for hot rolling, the final rolling temperature of hot rolling is 880°C, the coiling temperature is 520°C, hot rolling The thickness of the coil is 6.0mm, and then it is pickled and cold-rolled. The reduction rate of cold rolling is 75%, and the cold rolling is rolled to the target thickness of 2.0mm. The yield strength of the obtained product is 276MPa, the tensile strength is 418MPa, and the elongation is 34%.

specific Embodiment 2

[0047] Chemical composition (mass percentage) of steel C: 0.185%, Mn: 0.31%, Si: 0.12%, P: 0.018%, S: 0.010%, Al: 0.017%, and the balance is iron and unavoidable impurities.

[0048] Its technological process is: converter smelting → continuous casting → hot rolling → pickling cold rolling → bell annealing → smoothing → finished product.

[0049] Process parameters: Carry out converter smelting according to the above composition, and continuously cast it into a slab with a thickness of 230mm, then heat the slab to 1230°C for hot rolling, the final rolling temperature of hot rolling is 890°C, the coiling temperature is 550°C, and the hot rolling The thickness of the coil is 5.0mm, and then it is pickled and cold-rolled. The reduction rate of cold rolling is 70%, and the cold rolling is rolled to the target thickness of 1.5mm. The yield strength of the obtained product is 256.5MPa, the tensile strength is 406MPa, and the elongation is 35%.

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Abstract

The invention discloses 400 MPa-tensile-strength high-strength carbon-manganese constructional steel and a manufacturing method of the 400 Mpa-tensile-strength high-strength carbon-manganese constructional steel. The 400 Mpa-tensile-strength high-strength carbon-manganese constructional steel comprises the following chemical ingredients in percentage by weight: 0.10-0.20% of carbon, no more than 0.30% of silicon, no more than 0.40% of manganese, 0.010-0.030% of aluminum, no more than 0.02% of phosphorus, no more than 0.015% of sulphur, and the balance of Fe and inevitable impurities. A cold-rolled high-strength carbon-manganese constructional steel plate is obtained through controlling the technological processes like converter smelting, continuous casting and hot rolling, wherein the yield strength is 250 MPa-280 MPa, the tensile strength is equal to or more than 400 MPa, and the elongation is equal to or more than 32%. By increasing the content of the carbon, the expensive metal is replaced and the production cost is lowered; due to the processes, the carbon and the Fe form dispersed thin carbide which is uniformly distributed in ferrite, so that the obtained cold-rolled carbon-manganese constructional steel plate has the characteristic of high strength.

Description

technical field [0001] The present invention relates to the technical field of metallurgical industrial products and their manufacturing techniques, and relates to cold-rolled steel sheets and their manufacturing techniques. More specifically, the present invention relates to a high-strength carbon-manganese structural steel with a tensile strength of 400MPa. In addition, the present invention It also relates to a production method of the cold-rolled steel plate. Background technique [0002] Demand for high-strength cold-rolled steel sheets is increasing due to weight reduction in automobiles, home appliances, and construction industries. Carbon-manganese cold-rolled high-strength structural steel is currently the most used high-strength cold-rolled steel plate for structural parts such as automobiles, home appliances, and buildings, accounting for about 50% of the entire high-strength steel plate. It is mainly quoted from German standards. At present, domestic Baosteel, A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C33/04C21D8/02
Inventor 潘红波杨兴亮詹华刘永刚舒宏富杨少华毛鸣张翠
Owner MAGANG (GROUP) HOLDING CO LTD
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