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Novel low-cost wear-resistant high-strength Q550D steel plate and production method thereof

A production method and low-cost technology, which are applied in the field of continuous casting to produce medium and thick plates, to achieve the effects of uniform steel plate performance, good promotion significance, and improved wear resistance.

Inactive Publication Date: 2013-04-03
NANYANG HANYE SPECIAL STEEL CO LTD
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Problems solved by technology

However, with the continuous progress of the machinery manufacturing industry, the requirements for the indicators of mechanical equipment and construction machinery continue to increase. The existing high-strength structural steel Q550D steel plate is difficult to fully meet the requirements. Therefore, this new solution is specially designed to meet the design needs of users.

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Embodiment Construction

[0018] The new low-cost wear-resistant high-strength steel Q550D steel plate of the present invention is composed of the following elements: C 0.04-0.10%, Si0.15-0.40%, Mn1.40-1.60%, P≤0.020%, S≤0.015%, Als0. 0.015-0.060%, Ti 0.005-0.060%, Cr 0.30-0.70%, Nb 0.02-0.07%, and the rest are Fe and unavoidable impurities.

[0019] The composition design scheme that the present invention takes is as follows table 1:

[0020] Table 1 Novel composition (unit, wt%)

[0021] element C Si mn P S als Ti Cr Nb National standard ≤0.18 ≤0.60 ≤2.00 ≤0.030 ≤0.025 ≥0.015 ≤0.20 ≤0.80 ≤0.11 Novel ingredients 0.04～0.10 0.15～0.40 1.40～1.60 ≤0.020 ≤0.015 0.015～0.060 0.005～0.06 0.30～0.70 0.02～0.07

[0022] The production method adopted in the present invention includes: converter smelting, LF refining, VD vacuum treatment (optional), continuous casting, slow cooling of slab, heating, TMCP rolling, slow cooling.

[0023] 1. In the converter smelt...

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Abstract

The invention discloses a novel low-cost wear-resistant high-strength Q550D steel plate and a production method thereof. The steel plate comprises the following elements: 0.04-0.10% of C, 0.15-0.40% of Si, 1.40-1.60% of Mn, not more than 0.020% of P, not more than 0.015% of S, 0.015-0.060% of Als, 0.005-0.060% of Ti, 0.30-0.70% of Cr, 0.02-0.07% of Nb and the balance of Fe and inevitable impurities. The production method comprises the steps of smelting in a converter, LF (ladle furnace) refining, VD (vacuum degassing) treatment (optional), continuous casting, casting blank slow cooling, heating, TMCP (thermomechanical control process) rolling and slow cooling. The steel plate and the production method have the beneficial effects that through the novel composite microalloying composition design idea and concise and effective process design, the indexes of the steel plate, such as mechanical properties, ultrasonic flow detection and the like are ensured; the wear resistance of the steel plate is improved; and the steel plate has uniform properties, excellent flaw detection quality and certain wear resistance, can be widely used in engineering machinery, coal machine industry, machinery manufacturing and the like, and has good promotion significance.

Description

technical field [0001] The invention relates to the field of medium and thick plates produced by continuous casting, in particular to a novel low-cost wear-resistant high-strength steel Q550D steel plate and a production method thereof. Background technique [0002] Specifications 10-80mm Q550D is a high-strength structural steel plate, which has high strength, good cold deformation ability, good plasticity and toughness, and can be widely used in various construction machinery, bridges, buildings, large factories, Projects such as stadiums. However, with the continuous progress of the machinery manufacturing industry, the requirements for the indicators of mechanical equipment and construction machinery continue to increase. The existing high-strength structural steel Q550D steel plate is difficult to fully meet the requirements. Therefore, this new solution is specially designed to meet the design needs of users. . Contents of the invention [0003] In view of the abov...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/28C21D8/02
Inventor 朱书成许少普刘庆波袁少威郭艳芳康文举朱先兴
Owner NANYANG HANYE SPECIAL STEEL CO LTD
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