Low-carbon round steel for agricultural vehicle shock absorber sleeve and converter smelting method of low-carbon round steel

Abstract

The invention provides low-carbon round steel for an agricultural vehicle shock absorber sleeve and a converter smelting method of the low-carbon round steel. Chemical constituents of the low-carbon round steel comprise main elements of 20# steel, and further comprise 0.0060-0.0150 (wt%) of Als and 0.0015-0.0035 (wt%) of Ca. The converter smelting method is characterized in that during catch carbon practice in the converter primary smelting process, the converter endpoint [C] is controlled to be larger than or equal to 0.15 wt%, and the content of oxygen in steel at the converter endpoint is smaller than 600 ppm; the increase of nitrogen in the electric-arc furnace smelting control process is less than 10 ppm, and the sulfur content is controlled to be 0.020-0.030 (wt%); and the increase of nitrogen in the billet continuous casting control process is less than 10 ppm. The low-carbon round steel achieves favorable mechanical property and anti-fatigue property through ingredient regulation and process control. By application of the low-carbon round steel and the converter smelting method thereof, the cost is lowered by 50-60 Yuan / ton steel, so that a practical cost significance is achieved; and as carbon steel replaces alloy steel, the demand for green development in the steel industry is met.

Description

technical field [0001] The invention relates to low-carbon steel and a smelting method thereof, in particular to a low-carbon structural round steel for agricultural vehicle shock absorber sleeves and a converter smelting method thereof. Background technique [0002] In recent years, the total output value of the global agricultural machinery industry has shown a steady growth trend, maintaining an annual growth rate of about 10%-15%. However, my country's current agricultural mechanization rate is only 57%, compared with 90% in developed countries, there is more room for development. The agricultural machinery subsidy policy implemented in our country has greatly accelerated the process of agricultural mechanization in our country. The industry predicts that in 2017, agricultural machinery subsidies will reach 23 billion yuan, which will stimulate consumption of 100 billion yuan. my country's agricultural machinery equipment manufacturing industry has a lot of room for de...

AI Technical Summary

Problems solved by technology

However, the alloy elements of this series of steel are relatively high, the chromium content of 20Cr is 1.0%, the cost of chromium alloy per ton of steel is about 100 yuan, and the production cost is relatively high; Difficult to control

With the development of on-line heat treatment technology for pipe production, the performance of alloy steel pipes after heat treatment is relatively rich, resulting in waste of material costs

However, the use of 20# steel in GB / T699 "High Quality Carbon Structural Steel" for heat treatment cannot meet user requirements

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