Heat-treating Chasing Punches: Quench and Temper
工具钢錾子的淬火与回火实践
标签：工具钢, 淬火, 回火, 自制工具
自制錾子的耐用度取决于热处理：T8/T10 碳工具钢锻打成坯后，刃部加热到 760–780 ℃（樱红色）水淬，锉刀试刻不动即达 HRC 58–62；随即 200–220 ℃ 回火 1 h 呈浅麦色，兼顾耐磨与抗崩刃。锤击端保留 5–8 mm 软区或用喷灯局部退火至蓝紫色（约 290 ℃），防止被锤墩出蘑菇头开裂。每批自制錾先在废铜上试走线，观察线缘是否起毛刺，再微调回火温度。
A self-made punch lives or dies by its heat treatment: forge T8/T10 carbon steel, quench the cutting end in water from 760–780 °C (cherry red) to HRC 58–62—verified by a file skidding—then temper 1 h at 200–220 °C to a pale straw colour for wear resistance without brittleness. Leave the hammering end soft for 5–8 mm or locally anneal it to blue (about 290 °C) so it never mushrooms. Trial-run every new punch on scrap copper and adjust temper slightly if the line edge fuzzes.