High strength low alloy structural normalizing A633GRD steel plate and production method thereof

A high-strength, low-alloy, production method technology, applied in the field of steel plate production, can solve problems such as less production and inability to meet market demand

Inactive Publication Date: 2012-02-08
NANYANG HANYE SPECIAL STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the thickness of the steel plate produced by iron and steel enterprises is less than 30mm, but the steel plate above 30mm is rarely produced due to technical limitations, which cannot meet the market demand.

Method used

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  • High strength low alloy structural normalizing A633GRD steel plate and production method thereof
  • High strength low alloy structural normalizing A633GRD steel plate and production method thereof
  • High strength low alloy structural normalizing A633GRD steel plate and production method thereof

Examples

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Effect test

Embodiment 1

[0032] Through KR molten iron pretreatment, converter smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling, controlled cooling, slow cooling, and normalizing processes, high-strength low-alloy structure normalizing with chemical composition as shown in Table 1 below is obtained Steel plate A633GRD steel plate finished steel, wherein the mechanical properties of the high-strength low-alloy structure normalized steel plate A633GRD steel plate are shown in Table 3 below.

[0033] Table 1 Chemical Composition of Steel in Example 1

[0034]

Embodiment 2

[0036] Through KR molten iron pretreatment, converter smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling, controlled cooling, slow cooling, and normalizing processes, high-strength low-alloy structure normalizing with chemical composition as shown in Table 2 below is obtained Steel plate A633GRD steel plate finished steel, wherein the mechanical properties of the high-strength low-alloy structure normalized steel plate A633GRD steel plate are shown in Table 3 below.

[0037] Table 2 Chemical Composition of Steel in Example 2

[0038]

[0039] The process route of the present invention: KR molten iron pretreatment→converter smelting→LF refining→VD vacuum smelting→continuous casting machine pouring→slab slow cooling→slab heating→slab dephosphorization→TMCP rolling→controlled cooling→steel plate straightening→stacking Pile slow cooling → positive harvest → surface inspection → finishing → flaw detection → performance inspection → qualified products...

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Abstract

The invention discloses a high strength low alloy structural normalizing A633GRD steel plate, which comprises the following chemical constituents in percentage by weight (unit, wt%): C: 0.10-0.18, Si: 0.20-0.40, Mn: 1.30-1.60, P: less than or equal to 0.010, S: less than or equal to 0.005, microalloying element (V plus Nb plus Ti): less than or equal to 0.10, Als: less than or equal to 0.050, and balance Fe and residual elements. Through adopting a series of productive technologies of KR molten iron pretreatment, converter smelting, LF refining, VD vacuum refining, continuous casting, heating, rolling, control cooling, slow-cooling and normalizing, the chemical composition design of low carbon, high manganese and microalloying element, and the LF plus VD technologies to ensure the cleanliness of the steel quality, the sum of levels of various impurities is not more than 3.0; the grain size of the steel reaches 8-9 levels through the control rolling, control cooling plus normalizing treatment; and through effectively carrying out the measures, the high strength low alloy structural normalizing A633GRD steel plate of 40-80mm is successfully produced.

Description

technical field [0001] The invention belongs to the technical field of steel plate production, and in particular relates to a high-strength low-alloy structure normalizing steel plate A633GRD steel plate and a production method thereof. Background technique [0002] A633GRD is grade D steel in the American Standard ASTM A633 / A633M-01 standard. The steel plate has excellent low temperature performance and is suitable for environmental requirements. The notch toughness of the steel plate is better than that of rolled steel plates with similar strength levels. Generally, iron and steel enterprises produce steel plates with a thickness of less than 30mm, but such steel plates with a thickness of more than 30mm are rarely produced due to technical limitations, which cannot meet market demand. Contents of the invention [0003] In view of the above problems, the present invention provides a low-cost, easy-to-produce high-strength low-alloy structure normalized steel plate A633GR...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/12C22C38/06C22C38/04C21D8/02C21D1/28C21C1/02C21C7/10C21C7/076B22D11/18B21B37/74
CPCY02P10/20
Inventor 朱书成李忠波许少普张立新崔冠军高照海于飒袁永旗李亮亮刘庆波赵迪贾涛张强
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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