Moderate-strength steel rail and production method thereof

A production method for a 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 steel rail;
• performing heat treatment on the steel rail by using rolling residual heat;
• and
• applying accelerated cooling to a whole section of the steel rail after the heat treatment;
• wherein the steel billet is heated at a temperature of 1200-1250° C. and maintained at a holding time of 150-240 min in a soaking segment;
• wherein temperature of the rolling residual heat is 620-780° C. while the heat treatment is performed;
• and
• wherein a cooling rate of 1-4° C./s is applied to a width of 50-60 mm of a rail head tread of the steel rail while the heat treatment is performed.