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Production method of yield strongth 460 MPa grade low alloy high strength structure steel plate

A low-alloy high-strength, yield-strength technology, applied in the field of low-alloy high-strength structural steel sheet manufacturing, can solve the problems of increased rolling mill load and energy consumption, high steelmaking cost, low finishing temperature, etc. Steel cost, high crack arrest performance, and the effect of reducing billet cracking

Inactive Publication Date: 2004-10-20
NORTHEASTERN UNIV
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Problems solved by technology

However, due to the high amount of Nb and V used in this steel, the general ratio is 0.03-0.06wt% for Nb, and 0.05-0.08wt% for V, so the cost of steelmaking is very high. In addition, in order to obtain better impact toughness , requires a very low final rolling temperature, which not only increases the load and energy consumption of the rolling mill, but also lowers the production efficiency

Method used

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  • Production method of yield strongth 460 MPa grade low alloy high strength structure steel plate

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Embodiment Construction

[0011] According to the chemical composition of the present invention, three batches of continuous casting billets from an industrial converter of a certain enterprise are used to produce square billets with a thickness of 100 × 90 × a length of 250 mm. The controlled rolling and cooling process is simulated on the experimental rolling mill, and the thickness specifications are respectively rolled. For steel plates of 12mm, 20mm and 30mm, each specification is an example, the sample numbers are 1, 2, and 3 respectively. The chemical composition is shown in Table 1 below, the controlled rolling and cooling process is shown in Table 2, and the mechanical properties are shown in Table 3. See you at the metallographic organization figure 1 .

[0012] Sample No

[0013] Sample code

[0014] Sample No

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Abstract

A low-alloy high-strength steel plate with high yield strength (460 MPa) contains C (0.13-0.20 wt.%), Si (0.2-0.5), Mn (1.3-1.7), Nb (0.01-0.02) Ti (0.005-0.01), Al (0.005-0.015) and Fe (rest). Its preparing process features that two-stage rolling at 1200-1250 deg.C and quick cooling. Its advantages are multi-phase structure including polygonal and acicular ferrite, pearlite and bainite, high yield strength and low cost.

Description

Technical field [0001] The invention relates to a manufacturing method of a low-alloy high-strength structural steel sheet, in particular to a manufacturing method of a low-alloy high-strength structural steel sheet used for manufacturing various engineering machinery and equipment. Background technique [0002] Since the 1970s, the manufacturing of construction machinery has developed towards high-parameter, large-scale and light-weight directions, which has promoted the development and production of steel for construction machinery. Such as the manufacture of high-strength welded structural steel required for mining, loading and transportation equipment in large mines. At present, high-strength steel plates with a tensile strength of 60 kg (yield strength of 460MPa) have already been produced in the world. Researchers at Baosteel and Wuhan Iron and Steel in my country, using Nb-V composite microalloying and TMCP technology, have successively developed BHW60A and HG60 steels for...

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Application Information

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IPC IPC(8): C21D8/02C22C38/14
Inventor 刘彦春李艳梅朱伏先刘相华王国栋
Owner NORTHEASTERN UNIV
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