Preparation method of Q460 hot rolled round steel for rare earth low-temperature-resistant automobile part

A technology for auto parts and low temperature resistance, which is applied in the field of preparation of Q460 hot-rolled round steel for rare earth and low temperature resistant auto parts, can solve the problems of high manufacturing cost, complex chemical composition and high production cost, and achieves improved processing performance and welding. Performance, obvious metamorphism, obvious purification effect

Inactive Publication Date: 2020-08-07
BAOTOU IRON & STEEL GRP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The chemical composition of this steel is complex, the production cost is high, and its composition is prone to quality problems such as billet cracks during the smelting process, so it is not suitable for smelting with rectangular billets
[0006] The commonality of the above patent

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  • Preparation method of Q460 hot rolled round steel for rare earth low-temperature-resistant automobile part

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Embodiment Construction

[0027] A preparation method of Q460 hot-rolled round steel for rare earth low-temperature resistant auto parts, the chemical composition of the Q460 hot-rolled round steel is: C: 0.12-0.15%, Mn: 1.40-1.55%, Si: 0.30- 0.40%, V: 0.80-1.00%, Ni: 0.20-0.40%, RE: 0.01-0.02%, P: ≤0.010%, S: ≤0.005%, the rest is iron and unavoidable trace chemical elements;

[0028] Its steelmaking process is: converter—external refining—VD vacuum treatment—continuous casting; steel rolling process is: billet heating—high pressure water dephosphorization—Ф850mm blanking machine—Ф700mm×3+Ф550mm×4 continuous rolling unit rolling Manufacturing—sawing—slow cooling—nondestructive testing—stacking—inspection—grinding—bundling—storage—delivery; the technical parameters controlled in the rolling process are: heating temperature 1200—1250°C, holding time ≥ 2.5 hours; start rolling temperature ≤ 1150°C; finish rolling temperature ≤ 850°C; slow cooling time ≥ 48 hours; the structure after rolling is ferrite + p...

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Abstract

The invention discloses a preparation method of Q460 hot rolled round steel for a rare earth low-temperature-resistant automobile part. A steelmaking process flow of the preparation method comprises converter- external refining-VD vacuum treatment-continuous casting; and a steel rolling process flow comprises casting blank heating-high pressure water dephosphorization-Q850 mm cogging mill-phi700 mm*3+phi550 mm*4 continuous rolling mill rolling-saw cutting-slow cooling- nondestructive testing-stacking-examination-coping-bundling- putting in storage-delivery. The control technical parameters inthe rolling process are as follows: the heating temperature is 1200-1250 DEGC, the insulating time is greater than or equal to 2.5 hours, the opening rolling temperature is smaller than or equal to 1150 DEG C, the finishing temperature is smaller than or equal to 850 DEG C, and the slow cooling time is greater than or equal to 48 hours. Rolled tissues are ferrite+pearlite tissues. The invention aims to provide the preparation method of Q460 hot rolled round steel for the rare earth low-temperature-resistant automobile part. Delivered in a hot rolled state, a complex thermal treatment process is not needed, so that the preparation method has a relatively wide process window.

Description

technical field [0001] The invention relates to the field of material metallurgy, in particular to a preparation method of Q460 hot-rolled round steel for rare earth low-temperature resistant auto parts. Background technique [0002] The development of automobiles is developing in the direction of high power output, light weight, high performance, long life, noise reduction, stable operation, safety and reliability, environmental protection, energy saving, economical and low cost, easy processing, and multiple varieties. Steel for auto parts is the key part of the car and the manufacturing material for the core components that ensure the running performance of the car. The development direction of automobiles puts forward higher requirements for the development of steel for auto parts. Q460E is mainly used for steel for transmission and transmission systems, steel for suspension and steering systems, and steel for standard parts systems. The main products are drive shafts, ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/12C21D8/06
CPCC21D8/065C22C38/002C22C38/005C22C38/02C22C38/04C22C38/08C22C38/12
Inventor 宋振东涛雅周彦卜向东
Owner BAOTOU IRON & STEEL GRP
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