12.0-16.0 mm thick high-toughness 700MPa grade automobile beam steel and production method thereof

A technology of automobile frame steel and production method, which is applied in the field of 12.0-16.0mm thick high toughness 700MPa grade automobile frame steel and its production field, which can solve the problems of thickness specification not exceeding 14.0mm, low strength, single thickness specification, etc., and achieve improvement Effects of strength and low-temperature impact toughness, increased recrystallization temperature, and good formability

Inactive Publication Date: 2020-08-18
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN109161806A discloses a 700MPa grade automobile beam steel strip and its preparation method, only publishes the mechanical properties with a thickness of 14.0mm, and the thickness specification is single
[0008] In short, the 700MPa grade automobile frame steel involved in the above documents and patents has technical problems such as thickness specifications not exceeding 14.0mm and low strength.

Method used

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  • 12.0-16.0 mm thick high-toughness 700MPa grade automobile beam steel and production method thereof
  • 12.0-16.0 mm thick high-toughness 700MPa grade automobile beam steel and production method thereof

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preparation example Construction

[0028] In the second embodiment of the present invention, the present invention also provides a method for preparing the above-mentioned 12.0-16.0mm thick high-toughness 700MPa-grade automobile frame steel strip, including steps: molten iron pretreatment, converter compound blowing, RH refining, continuous casting, Slab heating, hot continuous rolling, laminar cooling and coiling.

[0029] In a preferred embodiment, the above-mentioned continuous casting step includes the following steps: molten iron pretreatment, converter combined blowing, RH refining and casting machine; specifically, the molten iron is subjected to desulfurization pretreatment, and the molten iron is decarburized by top-bottom combined blowing converter smelting , Dephosphorization to obtain molten steel, the obtained molten steel is added to the converter, and the tapping temperature of the converter is ≥1610°C; then the molten steel after converter smelting is subjected to the LF refining process, and fer...

Embodiment 1

[0037] Embodiment 1: Preparation of 12.0-16.0mm thick high toughness 700MPa grade automobile frame steel of the present invention

[0038] The molten iron is subjected to desulfurization pretreatment, and the molten iron is decarburized and dephosphorized by top-bottom combined blowing converter smelting to obtain molten steel. Scrap steel is added to the converter, and the tapping temperature of the converter is ≥1610°C. Then, the molten steel after converter smelting is subjected to the LF refining process, and alloys such as ferromanganese, ferrosilicon, and ferro-niobium are added according to the composition of the molten steel to adjust to the target composition. After LF refining, the molten steel is subjected to RH operation. After the RH vacuum treatment, adjust the flow of argon gas to make the molten steel in a soft blowing state, and feed the Si-Ca wire for calcium treatment. After feeding the wire, ensure that the soft blowing time is longer than 5 minutes to preve...

Embodiment 2

[0039] Embodiment 2: Preparation of 12.0-16.0mm thick high toughness 700MPa grade automobile frame steel of the present invention

[0040] The molten iron is subjected to desulfurization pretreatment, and the molten iron is decarburized and dephosphorized by top-bottom combined blowing converter smelting to obtain molten steel. Scrap steel is added to the converter, and the tapping temperature of the converter is ≥1610°C. Then, the molten steel after converter smelting is subjected to the LF refining process, and alloys such as ferromanganese, ferrosilicon, and ferro-niobium are added according to the composition of the molten steel to adjust to the target composition. After LF refining, the molten steel is subjected to RH operation. After the RH vacuum treatment, adjust the flow of argon gas to make the molten steel in a soft blowing state, and feed the Si-Ca wire for calcium treatment. After feeding the wire, ensure that the soft blowing time is longer than 5 minutes to preve...

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Abstract

The invention discloses 12.0-16.0 mm thick high-toughness 700MPa grade automobile beam steel and a production method thereof. The beam steel comprises the following chemical components of, in percentage by weight, 0.06 %-0.0 9 % of C, 0.10 %-0.30 % of Si, 1.60 %-1.90 % of Mn, smaller than or equal to 0.020 % of P, smaller than or equal to 0.005 % of S, 0.020 %-0.050 % of Alt, 0.04 %-0.06 % of Nb,0.06 %-0.10 % of Ti, smaller than or equal to 0.0050 % of N, and the balance Fe and inevitable impurities. The invention also discloses the production method of the beam steel. According to the beam steel and the method, the metallographic structure of the automobile beam steel is ferrite and pearlite, wherein the content of the pearlite is smaller than 10 %, and the grain size is larger than or equal to 12 level; and a rolling technology is optimized to produce the automobile beam steel which is thick and good in strength and toughness matching, so that the specification range of the automobile beam steel with the strength level is widened.

Description

technical field [0001] The invention relates to the technical field of production of thick-gauge high-strength steel, especially has high strength, excellent plasticity, low-temperature impact toughness and welding performance, and is mainly used for automobile structures such as automobile beams and longitudinal beams that require good forming and processing performance and high strength requirements Parts, especially relate to a 12.0-16.0mm thick high toughness 700MPa grade automobile frame steel and its production method. Background technique [0002] With the development of the economy, automobiles have played an increasingly important role in industrial and agricultural production and people's daily life. At the same time, the widespread application of automobiles has brought many problems while facilitating people's production and life. Consumption, environmental pollution and other issues. Therefore, the lightweight of automobiles has become an important topic for th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/14C22C38/12C21D8/02
CPCC21D8/0205C21D8/0226C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 杨维宇张智刚刘勤勤宿成刘妍张秀飞魏晓东郭冬青刘野宋冉臣刘智光
Owner BAOTOU IRON & STEEL GRP
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