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

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...

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.

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