Continuous annealing low alloy steel HC500LA and smelting method thereof

A low-alloy steel and smelting method technology, applied in the field of iron and steel metallurgy, can solve the problems of low smelting rate of HC500LA, achieve the effect of improving cleanliness, low price, and favorable cost control

Pending Publication Date: 2021-10-01
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the low refining rate of smelting continuous annealing low-alloy steel HC500LA in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0032] The invention provides a group of examples of smelting continuous annealing low alloy steel HC500LA by using the method of the invention.

[0033] The semi-steel after vanadium extraction and desulfurization of vanadium-containing titanium hot metal is used as raw material for primary molten steel, wherein the semi-steel contains C 3.41%, Mn 0.041%, P 0.062%, S 0.002%, V 0.04% and Trace amounts of Cr, Si and Ti, balance iron and unavoidable impurities.

[0034] The specific smelting steps are as follows:

[0035](1) Add 232.1 tons of the above-mentioned semi-steel into a 220-ton (nominal capacity) top-bottom re-blowing converter, and use the function of the top-bottom re-blowing converter to decarburize the above-mentioned semi-steel into molten steel. When the molten steel is initially smelted to a C content of 0.038wt%, a Mn content of 0.032wt%, a P content of 0.0081wt%, a S content of 0.0041wt%, and a temperature of 1671°C, the thick slag is tapped into the ladle; ...

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PUM

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Abstract

The invention discloses continuous annealing low alloy steel HC500LA and a smelting method thereof, and belongs to the technical field of ferrous metallurgy. The continuous annealing low alloy steel HC500LA comprises the following chemical components in percentage by mass: 0.06-0.08% of C, 0.12-0.18% of Si, 1.20-1.30% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005 of S, 0.050-0.060% of Nb, 0.030-0.040% of Ti, 0.015-0.050% of Als, and the balance of Fe and inevitable impurities. According to the smelting method of the continuous annealing low alloy steel HC500LA, by controlling the processes of converter smelting, LF refining and continuous casting, the cleanliness of molten steel can be effectively improved, the proportion of corner longitudinal cracking of a casting blank is reduced, the smelting rate of the continuous annealing low alloy steel HC500LA is increased to 95% or above from less than 80% in the early stage, and the problem that the smelting rate of the continuous annealing low alloy steel HC500LA is low in the prior art can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a continuously annealed low-alloy steel HC500LA and a smelting method thereof. Background technique [0002] With the advancement of science and technology, the requirements for energy conservation and emission reduction are becoming increasingly stringent, and the use of high-strength steel tends to be mainstream. Compared with traditional continuously annealed products, continuously annealed low-alloy steel has the advantages of high strength, good plasticity, and good formability, and is suitable for high-strength automotive structural components. [0003] Patent CN111826578A on October 27, 2020 discloses a 420MPa grade cold-rolled low-alloy high-strength steel and its manufacturing method. Its chemical composition is C 0.06-0.08%, Si 0.08-0.13%, Mn 1.00-1.10%, P≤ 0.018%, S≤0.005%, Alt 0.020-0.050%, Nb 0.040-0.050%, Ti 0.020-0.0.030%, Ca0.0010-0....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21C5/28C21C7/072C21C7/076C22C33/04
CPCC22C38/02C22C38/04C22C38/12C22C38/14C22C38/06C22C33/04C21C5/28C21C7/076C21C7/072Y02P10/20
Inventor 周伟王敏莉余灿生吴国荣郑昊青王建
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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