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Hardened and tempered steel plate production method

A production method, the technology of quenched and tempered steel plate, applied in the field of steelmaking, can solve the problem that the mechanical properties of steel are difficult to meet high requirements, and achieve the effect of uniform impact performance and large margin

Inactive Publication Date: 2015-07-08
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Most of the existing technologies are produced by quenching + tempering process, and the mechanical properties of steel are difficult to meet higher requirements

Method used

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  • Hardened and tempered steel plate production method
  • Hardened and tempered steel plate production method

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Embodiment Construction

[0016] The content of the present invention is further described below in conjunction with the embodiments.

[0017] The production method of quenched and tempered steel plate, the chemical composition mass percentage of steel is C=0.08~0.24, Si=0.20~0.50, Mn=0.80~1.30, P≤0.018, S≤0.005, Als≤0.020~0.050, Cr≤0.25, Mo≤0.08, Cu≤0.25, Ni≤0.25, the others are Fe and residual elements. Including the following process steps:

[0018] a. Converter smelting: control C≥0.05%, P≤0.015%, tapping temperature ≥1650°C, and spot blowing times ≤2 times to avoid slag during the tapping process;

[0019] b. LF refining: use a large amount of slag to make slag to ensure that the retention time of white slag is controlled at more than 15min;

[0020] c. Vacuum refining: refining under the pressure of ≤67Pa, holding time ≥ 25min;

[0021] d. Casting: The normal liquid level depth of tundish ladle casting is ≥1m, and the tundish is protected by covering agent;

[0022] e. Heating: The heat prese...

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Abstract

The invention discloses a hardened and tempered steel plate production method. Chemical components of steel include, by mass, 0.08% to 0.24% of C, 0.20% to 0.50% of Si, 0.80% to 1.30% of Mn, smaller than or equal to 0.018% of P, smaller than or equal to 0.005% of S, smaller than or equal to 0.020% or smaller than or equal to 0.050% of Als, smaller than or equal to 0.25% of Cr, smaller than or equal to 0.08% of Mo, smaller than or equal to 0.25% of Cu, smaller than or equal to 0.25% of Ni, and the balance Fe and remaining elements. The method includes the following processing steps of converter smelting, refining, vacuum refining, casting, heating, rolling, slow cooling and thermal treatment. Through continuous casting blank production, the internal quality of blanks is guaranteed, the low-cost chemical components only with Nb, V and Ti alloy added are selected and used for design, the cleanliness of steel is guaranteed through an LF and VD process, and the sum of the levels of various impurities does not exceed 2.0; through rolling control and normalizing treatment, the grain size of the steel reaches more than 8.0; through the effective implementation of the technical measures, steel plates for a carbon-manganese-silicon pressure container and steel plates guaranteeing flaw detection, the mechanical performance and the plate shape for the carbon-manganese-silicon pressure container are successfully produced.

Description

technical field [0001] The invention belongs to the steelmaking technology, and specifically relates to a production method of a quenched and tempered steel plate. technical background [0002] With the development of social economy, the demand for steel plates for carbon-manganese-silicon pressure vessels is increasing. Steel plates for pressure vessels require good mechanical properties, safety and reliability. The existing technology mostly adopts the quenching + tempering process for production, and the mechanical properties of the steel are difficult to meet higher requirements. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to provide a production method of quenched and tempered steel sheet, especially adopting a comprehensive production process to ensure the production method of quenched and tempered steel sheet for carbon-manganese-silicon pressure vessels, to ensure that the mechanical properties reach a yield margin of 50-80 Mpa, and a...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/42C22C38/40C22C38/22C22C38/20C22C38/18C22C38/16C22C38/12C22C38/06C22C38/04C21D8/02
Inventor 龙安辉杨建华张计谋张勇伟吴进杨文志谭小斌陈本强龙渊徐琛汪后明王超
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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