Non-quenched and tempered steel for automobile parts and production process thereof

A technology of auto parts and non-quenched and tempered steel, applied in the field of metallurgy, can solve problems such as poor purity of molten steel, poor microalloying technology, and unsatisfactory mechanical properties, and achieve optimal effect, uniform and refined material structure , the effect of grain refinement
CN110791708AActive Publication Date: 2020-02-14ZENITH STEEL GROUP CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ZENITH STEEL GROUP CORP
Publication Date
2020-02-14

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Abstract

The invention discloses non-quenched and tempered steel for automobile parts and a production process thereof. The non-quenched and tempered steel comprises less than or equal to 0.20% of Ni, 0.010-0.025% of Ti, 0.012-0.025% of Nb and 0.013-0.019% of N. The process comprises converter smelting, LF refining, RH vacuum treatment, continuous casting and rolling. According to the non-quenched and tempered steel, through reasonable design of components, trace elements such as Ni, Nb, Ti and N are added to refine grains and improve the strength and toughness of the material; refining is carried outthrough a narrow component control technology, soft reduction is used in the continuous casting process, reasonable parameters are adopted to reduce the low-power defects of a casting blank, and the density of the material can be improved; and the structure is uniform through a high-temperature diffusion process in the rolling process, the grains are refined through a controlled cooling and controlled rolling technology, the strength is improved, and finally the comprehensive performance of the material is greatly improved.
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Description

technical field

[0001] The invention belongs to the field of metallurgy and relates to a non-quenched and tempered steel for auto parts and a production process thereof. Background technique

[0002] Non-quenched and tempered steel was first developed by West Germany in the early 1970s. The so-called non-quenched and tempered steel is to add trace elements (Nb, V, Ti, N, etc.) The carbon (nitride) compound dispersed and precipitated in the pearlite is the strengthening phase, so that it can obtain the mechanical properties of the combined steel after quenching and tempering treatment without quenching and tempering treatment after rolling. Since the required strength and toughness can be obtained only by controlling the rolling process and the cooling rate after rolling, and the cutting performance is improved by adding appropriate S, the quenching and tempering process is omitted, energy is saved, and quenching is eliminated. Due to deformation, cracking and the increased s...

Claims

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