TGK SPECIAL STEEL PVT. LTD. - HANDBOOK

The Name You Can Trust www.tgkssl.com - 30 - 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 (W18) Thermal treatment Softening annealing Quenching Tempering Heating to 860ºC for heat insulation and cooling to room temperature in the furnace 1,250-1,290ºC quenching; high-speed gas quenching or hot oil cooling Tempering temperature 550- 570ºC, at least three times of tempering Tempering temperature and hardness relation curve CCT curve Hardness (HRC) Tempering temperature (ºC) HIGH SPEED STEEL