TGK SPECIAL STEEL PVT. LTD.

TPM 638 (Equivalent to ASP 2030) POWDER METALLURGY HIGH SPEED STEEL This steel has high wear resistance and high compressive strength under high hardness as well as good overall hardenability, heat treatment dimensional stability and excellent anti-tempering performance. Main application areas: high-performance cutting tools, such as end mills, hobs, planers, etc. INTRODUCTION CHEMICAL CLEANLINENESS A THIN B C D THICK THICK THIN THIN THICK THICK THIN 0.5 0.5 1.5 1.0 1.5 1.0 1.5 1.0 SOFT ANNEALING O O Heating to 860 C~900 C for 3~5h in a protective atmosphere, followed by O O cooling down to 500 C at 10 C/h, and then air-cooling out of the furnace. STRESS RELIEF ANNEALING O O Heating to 750 C~800 C for 2h, then air-cooling out of the furnace. MICROSTRUCTURE AS ANNEALED This PM HSS is made by hot isostatic pressing of the third-generation nitrogen gas atomized powders, followed by forging and heat treatment. CHEMICAL COMPOSITION (%) C W Mo 1.28 V Cr 4.2 5.0 6.4 3.1 Co 8.5 COMPARABLE STEELS TIANGONG TPM638 BOHLER ERASTEEL S590 ASP2030 DELIVERY STATE Delivery is annealed condition, Softening annealing hardness 300HB. Eutectic Carbide Unevenness: 0 level Large Carbide Size: 2.5um Hardness - Quench-Tempering Temper Curve O QUENCHING TEMP. ( C) 10.5 10.5 11 11 11 10.5 GRAIN SIZE (LEVEL) 1140 1160 1180 1200 1220 1220 GRAIN SIZE VS QUENCHING TEMPERATURE: MICROSTRUCTURE AS POWDERED (1) The carbides are small and evenly distributed. The size of carbides 5um (the average size of 3 large carbides in 10 fields of view at 1000X). (2) The unevenness of eutectic carbide is not more than level 1. ULTRASONIC FLOW DETECTION Flaw detection standard: according to SEP1921-E/e level of flaw detection and GB/T6402-2008 level 4 of assessment or upon customer-specific requirements. SIZE: ROUND Thickness 5mm - 205mm Width 5mm - 810mm 4mm to 100mm Thickness 0.5mm to 12mm Width 810mm Length 2500mm SIZE: FLATS SIZE: SQUARES SIZE: SHEETS Cold Drawn/Centreless Ground Bar Coil 1.0 - 13.5mm Forged & Turned bar 81.0 - 255.0mm Hot Rolled Peeled & Polish Bar 14.5 - 80.0mm 1.0 - 14.4mm 17