4.Mainly used to withstand the impact load is smaller, and require high abrasion resistance Die and punch, cold-cut scissors, drill sets, gauges, drawing die, pressure diethread rolling board, drawing die thread rolling die.

2.Chemical composition(for reference only):

3. Hardness: Annealed, 269 ~ 217HB, indentation diameter 3.7 ~ 4.1mm; quenching 55-60HRC

4.Heat treatment specifications:

1) quenching oil cooling, 950 ~ 1000 °C;

2) quenched 980 ° C, cold oil, tempering 180 °C 2h. Microstructure: tempered martensite and undissolved carbides, retained austenite

5.Delivery status: steel delivered in the annealed condition