Moderate-strength steel rail and production method thereof
AssigneePangang Group Panzhihua Iron & Steel Research Institute Co., Ltd.
InventorsJun YUAN, Yong DENG, Chongmu CHEN, Yuan WANG
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Abstract
A moderate-strength steel rail is provided. The chemical composition of the moderate-strength steel rail in weight percentages includes carbon 0.70-0.90 wt %, silicon 0.08-0.65 wt %, manganese 0.69-1.31 wt %, chromium 0.10-0.25 wt %, phosphorus ≤0.020 wt %, sulfur ≤0.020 wt %, and iron 96.85-98.41 wt %. According to a production method for the moderate-strength steel rail of the present invention, the moderate-strength steel rail produced has a rail hardness of 350-370 HB, a wear amount of ≤0.40 g, a contact fatigue life of ≥50,000 times, and a 610 mm steel rail waist opening ≤3.0 mm/400 mm.
Claims13
A moderate-strength steel rail, comprising:
- chemical composition in weight percentages:
- carbon 0.70-0.90 wt %, silicon 0.08-0.65 wt %, manganese 0.69-1.31 wt %, chromium 0.10-0.25 wt %, phosphorus ≤0.020 wt %, sulfur ≤0.020 wt %, and iron 96.85-98.41 wt %.
A production method for a moderate-strength steel rail, comprising:
- smelting and casting steel to form steel billet, wherein the steel has the following chemical compositions in weight percentages:
- carbon 0.70-0.90 wt %, silicon 0.08-0.65 wt %, manganese 0.69-1.31 wt %, chromium 0.10-0.25 wt %, phosphorus ≤0.020 wt %, sulfur ≤0.020 wt %, and iron 96.85-98.41 wt %;
- heating and rolling the steel billet into the moderate-strength steel rail;
- performing heat treatment on the moderate-strength steel rail by using rolling residual heat;
- and
- applying accelerated cooling to a whole section of the moderate-strength steel rail after the heat treatment.
Dependencies are inferred from the claim text.