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高锰钢是一种含锰量为10～14％、锰碳比大于或等于10的合金钢。这种钢经过水韧处理后,具有良好的耐磨性能和抗冲击韧性。由于在受冲击载荷的过程中,表面会形成硬化层,因此,这种合金钢是制造铁路辙岔的理想材料。但是,随着我国铁路运输事业的蓬勃发展,现行生产的高锰钢辙岔已不能适应运输量大、车轴重、车速快和车次频繁的要求。经过对辙岔使用现场的调查和实物考核,发现现行生产的高锰钢辙岔,由于内在质量上存在疏松、缩孔,以及粗大的柱状品等缺陷,致使在磨耗到限以前,大量辙岔就提前破损了。
High manganese steel is a manganese content of 10 to 14%, manganese carbon ratio greater than or equal to 10 alloy steel. This steel after toughening water, has good wear resistance and impact toughness. Because of the hardened layer formed on the surface during impact loading, this alloy steel is the ideal material for making railway frogs. However, with the vigorous development of China’s railway transportation, the current production of high manganese steels can not meet the requirements of heavy traffic, heavy axle weight, fast speed and frequent train trips. After the field survey and physical examination of the use of the frog, it is found that the existing high manganese steel frogs have defects such as looseness, shrinkage holes and large columnar products, resulting in a large number of frogs Damaged earlier.