TGK SPECIAL STEEL PVT. LTD.

O Temperature [ C] PLASTIC MOULD STEEL TGP 40 (DIN - 1.2738 (HH)) EAF + LF + VD + ESR SMELTING METHOD If futures excellent hardening penetration, good workability, polishing and photoengraving properties. This steel is used for plastic moulds of medium and big size. It can be subject to a nitriding treatment to imporve its wear resistance. MAIN CHARACTERISTICS  Injections and thermoplastic extrusion moulds, rubber moulds, moulds carrier frames, container. MAJOR APPLICATIONS ANNEALING O  Heat to 710 - 740 , with hold at minimum rate for 3 hours O  Slow furnace cooling to 600 C THERMAL TREATMENT CHEMICAL COMPOSITION (%) C Mo Mn P Ni 0.35 / 0.45 S 0.90 / 1.20 0.15 / 0.25 1.30 / 1.60 0.030 Si Cr 1.80 / 2.10 0.030 0.20 / 0.40 UNI -- W.Nr DIN AFNOR 1.2738 40Cr/MnNiMo8-6-4 40 CMND8 P20 + Ni P20 + Ni BS AISI/SAE COMPARABLE STANDARDS AC1 Ms O 710 C O 290 C CRITICAL POINTS Hardened and Tempered Normal HB 280 - 320 & 380 - 400 SUPPLY CONDITIONS  To be carried out after machining and before the final heat treatment O  Heating to 530 - 580 C for 2 h STRESS RELIEVING HARDENING Preheating Austenitizing Cooling Medium Quenched Hardness O 500 - 550 C O 840 - 880 C O Oil or thermal bath cooling at 200 - 230 C, then oil cooling according to the steel shape size 52 - 54 HRC O O  To be carred out after the hardening and when the steel is at 60 - 80 C , at 500 - 600 C according to the required hardness and with permanence for at least 2 h  Cooling in air TEMPERING 41