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道岔是列车通过的咽喉,直接承受列车车轮的负荷、冲击和磨耗,由于磨耗超限而经常被更换,给线路维修和养护带来很大困难,为提高道岔质量,延长道岔的使用寿命,除了从道岔设计上加以研究改进外,在材质上可采用高锰钢作辙岔和碳钢道岔表面淬火等。目前道岔经表面淬火后,使用寿命一般可提高2～3倍以上。过去道岔淬火大都采用火焰表面淬火,但淬火层较浅,加热温度不易控制,淬火质量不高,直接影响使用寿命。虽有个别工厂
Turnout is the train through the throat, the train directly withstand the wheel load, impact and wear, due to wear and tear are often exceeded replacement, maintenance and maintenance of the line to bring great difficulties, in order to improve the quality of the turnout and extend the service life of the turnout, in addition to From the turnout design to be improved on research, the material can be high manganese steel for the turnout and carbon steel turnout surface hardening. Turnout surface quenching, the service life can generally be increased by 2 to 3 times. In the past, most of the quenching of the fire quenched the surface of the flame, but the quenching layer is shallow, heating temperature is not easy to control, quenching quality is not high, directly affect the service life. Although there are individual factories