TGK SPECIAL STEEL PVT. LTD.

POWDER METALLURGY HIGH SPEED STEEL TPM 558 (Equivalent to ASP 2052) This steel is comparable to BÖHLER S390, high alloy, high wear resistance, high red hardness. Application areas: heavy-duty machining tools for processing steel, nickel-based and titanium alloy; can be used to produce hobs, milling cutters, and various kinds of cutting tools. INTRODUCTION COMPARABLE STEELS TIANGONG TPM558 BOHLER ERASTEEL S390 ASP2052 DELIVERY STATUS Delivery is annealed condition, annealing hardness 300HB. 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 Detection standard: according to SEP1921-E/e level of flaw detection and GB/T6402-2008 level 4 of assessment or upon customer-specific requirements. 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 1.5 SOFT ANNEALING O O Soft annealing at 860 C~900 C for 3~5h in a protective atmosphere, followed by O O slow 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 third-generation powdered high speed steel is made by hot isostatic pressing of the gas atomized powders followed by forging and heat treatment. CHEMICAL COMPOSITION (%) C W Mo 1.65 V Cr 4.82 2.10 4.90 10.50 Co 8.10 Large Carbide Size: 2.4um Eutectic Carbide Unevenness: 0.5 Quench-Temper Curve O QUENCHING TEMP. ( C) 12 11.5 11.5 11.5 11.5 11 GRAIN SIZE (LEVEL) 1140 1160 1180 1200 1220 1240 RECOMMENDED TEMPERATURES OF HEAT TREATMENT TOTAL O QUENCHING TEMP./ C O TEMPERING TEMP./ C Single - Edge Cutter Multi - Edge Cutter Mold 1180 - 1200 1160 - 1800 1140 - 1160 540 - 560 540 - 560 540 - 560 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 16