Production method of sulfur-containing steel ST52-3 for automobile door hinge

Abstract

The invention discloses a production method of sulfur-containing steel ST52-3 for an automobile door hinge. The production method sequentially comprises the following steps: S1, pretreatment of molteniron; S2, open-hearth smelting; S3, argon blowing treatment; S4, refining; S5, VD vacuum treatment; S6, large square billet continuous casting; and S7, a casting blank is put into a walking beam furnace to be heated, the heating temperature is 1100 DEG C to 1200 DEG C, and then the needed steel is prepared; The sulfur-containing steel ST52-3 for the automobile door hinge comprises the following chemical components: 0.17-0.23 wt% of C, 0.8-1.1 wt% of Si, 1.30-1.85 wt% of Mn, less than or equal to 0.016 wt% of P, less than or equal to 0.012 wt% of S, 0.015-0.055 wt% of Al, less than or equal to2.30 wt% of Cr+Ni+Mo, 0005-0.0020 wt% of RE0 and the balance Fe and non-detectable residual elements. According to the production method of the sulfur-containing steel ST52-3 for the automobile doorhinge, a converter is abandoned, smelting is conducted through a flat furnace, wind is blown through 30% oxygen-enriched air, oxygen is blown into molten metal, the productivity can be improved by 80%, the smelting time can be shortened by 2-4 hours, and fuel can be saved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of sulfur-containing steel ST52-3 for automobile door hinges. Background technique [0002] With the continuous improvement of living standards, the number of family cars is also increasing, and more and more door hinges need to be used. In the known technology, the production of traditional hinge steel ST52-3 is quite cumbersome, and the output Low cost and long time consumption, so a production method of steel ST52-3 for sulfur-containing automobile door hinges is needed to solve the above problems and meet people's needs. Contents of the invention [0003] The object of the present invention is to provide a production method of sulfur-containing steel ST52-3 for automobile door hinges, so as to solve the problems raised in the above-mentioned background technology. [0004] In order to achieve the above object, the present invention provid...

AI Technical Summary

Problems solved by technology

[0002] With the continuous improvement of living standards, the number of family cars is also increasing, and more and more door hinges need to be used. In the known technology, the production of traditional hinge steel ST52-3 is quite cumbersome, and the output Low cost, long time-consuming, so there is a need for a production method of sulfur-containing automotive door hinge steel ST52-3 to solve the above problems and meet people's needs