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A kind of 700mpa level boron-containing steel for automobile torsion beam and its preparation method

A technology for torsion beams and automobiles, applied in the field of steel smelting, can solve the problems of insufficient fatigue strength of torsion beams, achieve the effects of excellent surface quality and weldability, reduce production costs, and reduce usage

Active Publication Date: 2022-04-19
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problem of insufficient fatigue strength of torsion beams, the present invention provides a 700MPa grade boron-containing steel for automotive torsion beams, which has low addition of microalloy elements, thereby reducing material production costs, and has excellent stamping performance, welding performance and Fatigue performance

Method used

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  • A kind of 700mpa level boron-containing steel for automobile torsion beam and its preparation method
  • A kind of 700mpa level boron-containing steel for automobile torsion beam and its preparation method
  • A kind of 700mpa level boron-containing steel for automobile torsion beam and its preparation method

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preparation example Construction

[0054] A kind of preparation method of 700MPa level boron-containing automobile torsion beam steel of the present invention comprises:

[0055] (1) After the molten iron is pretreated, molten steel is obtained through smelting and LF+RH refining, and the molten steel is continuously cast to obtain a slab, and the chemical composition of the molten steel is the same as that of the steel for the automobile torsion beam.

[0056] (2) Heating the slab to 1200-1250°C for a heating time of 150-200min, and then performing 5 passes of rough rolling and 7 passes of finish rolling to obtain a hot-rolled sheet, wherein the rough rolling termination temperature is 1020-1080 ℃, the finish rolling termination temperature is controlled at 880-910 ℃, the thickness change of the hot-rolled plate is 2-5mm, and the constant-speed rolling is adopted during the finish rolling, and the rolling speed is adjusted according to the finished plate thickness specification.

[0057] (3) The hot-rolled she...

Embodiment

[0065] A kind of 700MPa level boron-containing steel for automobile torsion beams of the present invention, the chemical composition of the steel for automobile torsion beams is calculated as follows in mass fraction:

[0066] C: 0.03-0.12%, Si: 0.05-0.18%, Mn: 0.8-2.0%, P≤0.02%, S≤0.009%, Als: 0.03-0.04%, Ti: 0.05-0.15%, Mo: 0.1-0.3 %, B≤0.005%;

[0067] Among them, the addition of microalloying elements Ti and Mo satisfies: 1.4≤(%C / 12) / [(%Ti / 48)+(%Mo / 96)]≤1.8, and 0.45≤(%Ti) / (% Mo)≤0.55; the rest is Fe and unavoidable impurities.

[0068] A kind of preparation method of 700MPa level boron-containing automobile torsion beam steel of the present invention comprises:

[0069] (1) A slab is obtained by continuous casting of molten steel, and the chemical composition of the molten steel is the same as that of the steel for the automobile torsion beam.

[0070] (2) Heating the slab to 1200-1250°C for a heating time of 150-200min, and then performing 5 passes of rough rolling an...

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Abstract

The invention provides a 700MPa-level boron-containing steel for automobile torsion beams, which belongs to the technical field of iron and steel smelting. The chemical composition of the steel for automobile torsion beams is: C: 0.03-0.12%, Si: 0.05-0.18%, Mn: 0.8‑2.0%, P≤0.02%, S≤0.009%, Als: 0.03‑0.04%, Ti: 0.05‑0.15%, Mo: 0.1‑0.3%, B≤0.005%; the rest is Fe and unavoidable impurities. Its low addition of microalloying elements reduces material production costs, and it has excellent stamping, welding and fatigue properties. The invention also provides a preparation method of 700MPa boron-containing steel for torsion beams of automobiles.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and relates to a 700MPa-level boron-containing steel for an automobile torsion beam and a preparation method thereof. Background technique [0002] When the car is running on rough roads, the torsion beam bears the longitudinal force transmitted by the wheels and the alternating load in the vertical direction at the same time, and the stress at the beam is high, which is prone to fatigue fracture. Therefore, it is necessary to require the torsion beam to have high fatigue strength while having high strength. Contents of the invention [0003] In order to solve the technical problem of insufficient fatigue strength of torsion beams, the present invention provides a 700MPa grade boron-containing steel for automotive torsion beams, which has low addition of microalloy elements, thereby reducing material production costs, and has excellent stamping performance, welding performance a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D8/02C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/14C22C38/12C22C38/002C22C33/04C21D8/0205C21D8/0226C21D8/0278
Inventor 李秋寒郭子峰郭佳张衍冯军陈斌李玉鹏吕宝锋赵青尼兴范然然杨业周娜徐伟张嘉琪宋春华陈波
Owner SHOUGANG CORPORATION