Forging or rolling process of alloyed high manganese steel frog

Abstract

The invention provides a forging (or rolling) process of an alloyed high manganese steel frog. The alloyed high manganese steel frog comprises 1.0-1.2 wt% of C, 11.0-14.0 wt% of Mn, 0.1-1.2 wt% of Cr, 0.05-1.2 wt% of Mo, 0.05-0.55 wt% of V, 0.3-0.8 wt% of Si, 0.002-5.0 wt% of Ni, 0.001-0.05 wt% of Re, 0.001-0.01 wt% of Mg, 0.001-0.1 wt% of Zr, less than or equal to 0.035 wt% of P, less than or equal to 0.015 wt% of S and the balance Fe. The process comprises the following steps that a steel billet or a continuous casting billet is subjected to cogging forging or rolling, wherein the steel billet is heated to a temperature 100-150 DEG C below the melting temperature to start forging or rolling, the continuous casting billet can be directly heated to the temperature in a heating furnace without being cooled to the room temperature for cogging rolling, the cogging finish forging or finish rolling temperature is controlled to be 1000 DEG C or above, the cogging forging or rolling ratio is controlled to be 1.2-3.0, and the hammering speed of a hammer head is controlled to be less than 15 m / s during forging; and the billet obtained after cogging forging or rolling is heated to a temperature 100-150 DEG C below the melting temperature and then subjected to forging (or rolling), wherein the finish forging or finish rolling temperature is controlled to be 860 DEG C or above, and the forging or rolling ratio is controlled to be 2.0-15.0.

Description

technical field [0001] The invention relates to forging of an alloyed high-manganese steel frog for high-speed and heavy-duty railway lines that can eliminate casting defects such as shrinkage cavity and shrinkage porosity inside the frog, so that the crystal grains are refined, the structure is more uniform, and the mechanical properties are improved. Or a rolling process, which belongs to the field of high manganese steel frog manufacturing. Background technique [0002] Due to its excellent work hardening ability and high toughness, high manganese steel exhibits excellent wear resistance under impact and wear conditions. Therefore, high manganese steel was first used to make railway frogs in the United States in 1894. Due to its good performance, it was later widely used in the world. After more than 100 years of development, many countries in the world have formulated high manganese steel frog standards, but the chemical composition of high manganese steel used to make ...

AI Technical Summary

Problems solved by technology

Although the lower the phosphorus content in the as-cast high manganese steel, the better the thermoplasticity, which is more conducive to forging, but the high manganese steel described in the invention controls the phosphorus content within 0.01%, which not only makes it very difficult to realize the smelting process, but also causes casting problems. The cost of ingot manufacturing has increased significantly, which is not conducive to the practical application of forging products