TGK SPECIAL STEEL PVT. LTD. - HANDBOOK

The Name You Can Trust www.tgkssl.com - 12 - 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 (TG M-2A (Special Grade for Taps) HEAR TREATMENT : Soft annealing Cooling Hardness O O 780-860 C 10-20 C/h furnace max.280HB Stress relief annealing Cooling O 600-650 C furnace 1st pre heating 2nd and 3rd pre heating Hardening O O O up to approx.450 C a) 850 C 1200-1220 C O b) 850-1050 C Quenching O saltbath 550 C oil, air, vacuous Tempering : O Thrice 550-560 C Hardness after tempering 63-66HRC. HIGH SPEED STEEL