Production method of ultrahigh strength steel plate for cold forming and steel plate

A technology of ultra-high strength and production method, which is applied in the field of metal heat treatment, can solve the problems that have not been developed into steel heat treatment process, and achieve the effect of high strength

Active Publication Date: 2013-10-23
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some research work has revealed that during the quenching process, the retained austenite between the martensite strips is carburized, and the early literature has also discussed the distribution of carbon between martensite and retained austenite, as well as in silicon-containing steels. During the bainite transformation, carbon will diffuse to the austenite to form carbide-

Method used

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  • Production method of ultrahigh strength steel plate for cold forming and steel plate

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Effect test

Embodiment 1

[0032] The chemical composition of the steel is shown in Table 1. The continuous annealing process is 820°C for 60 seconds, cooled to 200°C at a rate of 100°C per second and held for 60 seconds before coiling. The distribution temperature in the bell furnace is 400°C. The time is 3h, the performance of the steel plate is shown in Table 2.

Embodiment 2

[0034] The chemical composition of the steel is shown in Table 1. The continuous annealing process is 880°C for 80 seconds, cooling to 240°C at a rate of 100°C per second and holding for 60 seconds before coiling. The distribution temperature in the bell furnace is 350°C. The time is 5h, and the performance of the steel plate is shown in Table 2.

Embodiment 3

[0036] The chemical composition of the steel is shown in Table 1. The continuous annealing process is 880°C for 10 seconds, cooled to 300°C at a rate of 1000°C per second and held for 90 seconds, then coiled. The distribution temperature in the bell furnace is 200°C. The time is 50h, and the performance of the steel plate is shown in Table 2.

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Abstract

The invention provides a production method of an ultrahigh strength steel plate for cold forming and the steel plate. The method comprises the steps of smelting, casting, hot rolling, cold rolling, heating the cold-rolled steel plate through a continuous annealing production line with rapid cooling treatment to the austenite temperature, holding the temperature for a certain time, carrying out quenching treatment, obtaining a steel plate with the main structure of M+A and carrying out distribution treatment in a bell type annealing furnace. The steel plate comprises the following components in percentage by mass: 0.02-0.60% of C, 0.05-3.5% of Si, 0.20-3.50% of Mn, P more than or equal to 0.005 but less than or equal to 0.50%, S not more than 0.05%, 0.02-3.00% of Al, Cr not more than 0.50%, Ni not more than 3.00%, Cu not more than 0.50%, Mo not more than 1.50%, V not more than 0.50%, Ti not more than 0.20%, Nb not more than 0.20% and the balance of Fe and unavoidable impurities. The steel plate produced by adopting the method provided by the invention has the advantages of high strength and capability of cold forming and the process route of Q&P steel industrial production is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of metal heat treatment, and in particular relates to a production method of an ultra-high-strength steel plate for cold forming and an ultra-high-strength steel plate produced by the method. Background technique [0002] In recent years, people have paid more and more attention to environmental protection, resources and energy, and the safety standards for automobiles have also been continuously improved. In order to meet the requirements of energy saving and safety, automobiles are required to develop towards lightweight. The development and application of high-strength automotive steel has become one of the mainstream research topics of major steel companies in the world. [0003] For a long time, the traditional quenching and tempering process has been used to produce high-strength steel with martensitic structure. The martensite formed by quenching can increase the strength of steel, and tempering can ...

Claims

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Application Information

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IPC IPC(8): C22C38/04C21D8/02
Inventor 刘仁东吕家舜王旭徐荣杰王科强林利徐鑫
Owner ANGANG STEEL CO LTD
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