TGK SPECIAL STEEL PVT. LTD. - HANDBOOK

The Name You Can Trust www.tgkssl.com - 26 - Descriptions and data in the file are typical cases. We will not make guarantee for them. Besides, we reserve the final right to interpret improvement in materials, quality and/or performance. Steel grade (M4) Thermal treatment Softening annealing Quenching Tempering Heating to 840ºC for heat insulation and cooling to room temperature in the furnace 1,190-1,230ºC quenching; high- speed gas quenching or hot oil cooling Tempering temperature 540- 560ºC, at least three times of tempering Tempering temperature and hardness relation curve CCT curve Hardness (HRC) Tempering temperature (ºC) HIGH SPEED STEEL