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540MPa grade hot-rolled pickled steel plate and manufacturing method thereof

A hot-rolled pickling and steel plate technology, which is applied in the field of metal materials, can solve problems such as non-conformity, and achieve the effects of reducing load, improving hardenability, and refining structure

Active Publication Date: 2018-08-24
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the tensile strength of the steel plate produced by it is up to 475MPa, which does not meet the requirements of high-strength formed auto parts

Method used

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  • 540MPa grade hot-rolled pickled steel plate and manufacturing method thereof
  • 540MPa grade hot-rolled pickled steel plate and manufacturing method thereof
  • 540MPa grade hot-rolled pickled steel plate and manufacturing method thereof

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Embodiment Construction

[0025] The present invention is a 540MPa grade hot-rolled pickled steel plate. The chemical composition of the hot-rolled pickled steel plate is calculated by mass percentage: C 0.15%-0.25%, Si 0.01%-0.06%, Mn 0.80%-1.30%, Al 0.01%-0.06%, and 0.015%-0.050% Nb and / or 0.30%-0.40% Cr, and limit P<0.010%, S<0.005%, and the balance is Fe and unavoidable impurities.

[0026] The final structure of the hot-rolled pickled steel plate is composed of ferrite, pearlite and a small amount of bainite, and its structure composition is 55% to 65% of ferrite, 30% to 40% of pearlite and bainite by volume percentage. Tensile body 5% to 15%, yield strength > 440MPa, tensile strength > 540MPa, longitudinal elongation > 26%.

[0027] The effect of main chemical composition in a kind of 540MPa grade hot-rolled pickled steel plate of the present invention is:

[0028] C: Carbon is the most important solid solution strengthening element in steel, which is the guarantee of steel strength; considering...

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Abstract

The invention relates to a 540MPa grade hot-rolled pickled steel plate and a manufacturing method thereof. The hot-rolled pickled steel plate comprises the following chemical components in percentageby mass: 0.15-0.25% of C, 0.01-0.06% of Si, 0.80-1.30% of Mn, 0.01-0.06% of Al, 0.015-0.050% of Nb, and / or 0.30-0.40% of Cr, less than 0.010% of P, less than 0.005% of S, and the balance Fe and inevitable impurities; and the final structure of the hot-rolled pickled steel plate comprises 55-65% by volume of ferrite, 30-40% by volume of pearlite, and 5-15% by volume of bainite. According to the 540MPa grade hot-rolled pickled steel plate, the components are optimized on the basis of the chemical components of a C-Mn series steel; the technical parameters of the rolling process, the cooling process and the pickling process are controlled, and thus the hot-rolled pickled steel plate of which the yield intensity is 440MPa or more, the tensile strength is at540MPa grade or more, and the longitudinal elongation A is not less than 26% can be obtained.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a 540MPa hot-rolled pickled steel plate suitable for manufacturing auto parts and a manufacturing method thereof. Background technique [0002] In recent years, with the development of the automobile industry, automobile manufacturers have increasingly higher requirements for the individualization of steel materials. Hot-rolled pickled steel plate is made of high-quality hot-rolled steel plate as raw material. After the iron scale is removed by the pickling unit, the surface quality and service performance are intermediate products between hot-rolled steel plate and cold-rolled steel plate. It is part of hot-rolled steel plate and cold-rolled steel plate. An ideal substitute for cold-rolled steel sheets. In the severe situation of the steel market, hot-rolled pickled steel plates have the advantage of better surface quality compared with hot-rolled steel plates. Compared...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/18C22C38/26B21C37/02C21D8/02
CPCB21C37/02C21D8/0205C22C38/02C22C38/04C22C38/06C22C38/12C22C38/18C22C38/26
Inventor 孙成钱时晓光韩斌董毅张宇刘仁东徐荣杰张建军杨卫管成平
Owner ANGANG STEEL CO LTD
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