锤破机锤头和电铲铲牙爆炸预硬后，其使用寿命可提高约50%。
The life of the hammers and the teeth increase about 50% after explosive hardening.
DH2F已经预硬至37 - 41hrc表面硬度，无需在热处理，性能出色，便加工及雕模。
DH2F has the hard to 37-41 HRC in heat treatment, without surface hardness, excellent performance, and processing and carving mode.
国产新型塑料模具钢主要有预硬钢、时效硬化钢、淬火——回火钢、冷挤压成型模具钢、耐蚀钢等类型。
The new domestic - developed plastic mould steels include prehardening steel . age hardening steel, quenching-tempering steel, cold -forming steel, and anti - corrosion steel, etc.
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