TGK SPECIAL STEEL PVT. LTD.

HIGH SPEED STEEL TG M42 High steel hardness, reaching 68HRC after quenching and tempering, favorable hot hardening, capable of manufacturing various complicated tools with high precision. 15T intermediate frequency furnace (EAF+LF+VD+ESR) SMELTING METHOD MAIN CHARACTERISTICS  Capable of manufacturing abrasion resistant and impact resistant tools for various types of powerful cutting.  High-level trimming dies, screw dies, formed punches of complicated shapes requiring tenacity, etc.;  Scrapers, hobs, drilling bits, etc.  Cold forging molds. MAJOR APPLICATIONS CHEMICAL COMPOSITION (%) S 0.001 < C Cr Mn Co Mo 1.08 7.85 V 1.15 P 9.40 3.95 0.3 0.020 < Si 0.3 W 1.45 0 (ppm) H (ppm) N (ppm) 1.08 < 100 < 2.5 < O 20 ~ 400 C Room temperature 3 density (Kg/m ) 8.01 Specific heat of room temperature (J/Kg.K) O 200 C thermal l conductivity (W/mK) Elastic mouldus 2 (N/mm ) -6 Linear expansivity (x10 K) 460 19.00 220,000 10.8 11.6 O 20 ~ 200 C PHYSICAL PROPERTY ULTRASONIC FLAW DETECTION : As per SEP1921 D/d or customer requirements. Coarse 0.5 Class A 0.5 0.5 Class B Class C Class D Fine Coarse Fine Coarse Fine Coarse Fine 0.5 0.5 0.5 0.5 0.5 PURITY DELIVERY STATUS : Delivery under balling annealing state, delivery hardness 269HB. < O 1,180 C quenching Tempering temperature and harness relation curve UNDER ANNEALED CONDITION : Hardness : HB205-255 DELIVERY STATUS : As Cold drawn / Hot rolled / forged, in annealed condition. REDUCTION RATIO : As 1:4 or 1:5 PRODUCTION PROCESS EAF LF VD ESR BLOOM IN FOLLOWING MACHINE : QUICK FORGING (12.5MN), HAMMER, PRECISION FORGING Precision Forging Hot Rolled & Annealed Peeled (HRAP) Cold Drawn / Sand Blasted (Coil) Cold Drawn / Centreless Ground : 81 - 255mm : 14.5 - 80.0mm : 1.0 -13.5mm : 1.0 -14.4mm 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 SIZE: ROUND Thickness 5mm - 150mm Width 5mm - 810mm SIZE: FLATS 4mm to 100mm SIZE: SQUARES Thickness 0.5mm to 12mm Width 810mm Length 2500mm SIZE: SHEETS THERMAL TREATMENT Softening Annealing O Heating to 850 C for heat insulation; cooling to O 550 C slowly and then removing from the furnace Tempering Quenching O 1,175-1,180 C quenching; high-speed gas quenching or hot oil cooling O Tempering temperature 540-570 C, at least three times of tempering 10