Hot-rolled dual-phase steel in 590MPa tensile strength grade and method for manufacturing hot-rolled dual-phase steel

A technology of hot-rolled dual-phase steel and tensile strength, which is applied in the field of steel plate production, can solve the problems that the fatigue performance of parts cannot meet the design requirements, the high requirements of unfavorable part formability, and poor formability, etc., and achieve high delayed failure at room temperature , Large work hardening rate, high tensile properties

Active Publication Date: 2013-02-06
武汉钢铁有限公司
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Problems solved by technology

In order to ensure the formability of parts, the amount of martensite is generally controlled between 8 and 25%. If the amount of martensite is too much, the strength is too high and the formability is poor, which is not ...

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  • Hot-rolled dual-phase steel in 590MPa tensile strength grade and method for manufacturing hot-rolled dual-phase steel
  • Hot-rolled dual-phase steel in 590MPa tensile strength grade and method for manufacturing hot-rolled dual-phase steel
  • Hot-rolled dual-phase steel in 590MPa tensile strength grade and method for manufacturing hot-rolled dual-phase steel

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Embodiment Construction

[0030] The hot-rolled dual-phase steel with a tensile strength of 590 MPa and its manufacturing method according to the present invention will be described in detail below with reference to the accompanying drawings and specific examples.

[0031] Table 1 shows the weight percentage of the chemical composition of the steel of the specific embodiment of the present invention (the balance is Fe and unavoidable impurities).

[0032] Table 1

[0033]

[0034] The manufacturing method of the above-mentioned steel is as follows: top-bottom compound blowing is carried out on the 90-ton and 250-ton converters in the steelmaking plant, and the molten iron desulfurization technology is adopted to make the S in the molten iron ≤ 0.005%; Adding ferroalloy, the addition is completed when 2 / 3 of the steel is tapped, the alloying sequence: aluminum-iron → ferromanganese → ferrophosphorus → ferrochromium, using an aluminum adding machine to add aluminum wires for final deoxidation, fine-t...

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Abstract

The invention discloses hot-rolled dual-phase steel in the 590MPa tensile strength grade and a method for manufacturing the hot-rolled dual-phase steel. The steel comprises, by weight, from 0.04% to 0.10% of C, from 1.10% to 1.50% of Mn, from 0.10% to 0.20% of Si, from 0.015% to 0.070% of Als, from 0.03% to 0.08% of P, lower than or equal to 0.008% of S, from 0.5% to 1.2% of Cr, the balance Fe and inevitable impurities. The method for manufacturing the steel includes molten iron desulfurization, converter smelting, vacuum treatment, continuous casting, sizing, plate blank heating, hot continuous rolling, laminar cooling and reeling. As proved by practice, the steel is high in tensile strength, low in yield ratio and excellent in cold stamping forming performance and fatigue resistance, a technological process of the method is simple, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of steel plate production, and specifically refers to a hot-rolled dual-phase steel with a tensile strength of 590 MPa and a manufacturing method thereof. Background technique [0002] Reducing the weight of the vehicle body by increasing the strength of the steel plate, reducing consumption, saving energy, and reducing environmental pollution are important topics in the research of today's automobile industry. While continuously improving the strength of the steel plate, it should also have good toughness, fatigue resistance, and good bending and flanging performance. The wheel is a rotary moving part, and its weight reduction and energy saving effect is 1.5 times that of other parts. By using high-strength wheel steel to produce wheels, the weight can be reduced while ensuring the performance requirements, and a good energy-saving and environmental protection effect can be achieved. [0003] There are ma...

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Application Information

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IPC IPC(8): C22C38/18C21D8/02
Inventor 周祖安谢华周一中赵江涛桂洲刘斌杨海林刘永前曾萍
Owner 武汉钢铁有限公司
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