TGK SPECIAL STEEL PVT. LTD.

LOWER ALLOY HIGH SPEED STEEL TG 4241 / 4341 It is an economical low alloy high-speed steel with good red hardness, good toughness and thermal plasticity. It is generally used soft and moderate intensity metal. APPLICATIONS It is mainly used to produce drill, tap, saw bit and high efficiency wood tool. STEEL PROPERTIES C Si P W Mo Mn (Special grade) TG4341 0.90-0.95 0.83-0.93 1.80-2.50 3.50-4.50 1.00-1.20 2.50-3.50 Cr 4.00-4.50 3.80-4.40 V 0.80-1.00 1.20-1.80 0.25-0.40 0.20-0.40 0.80-1.20 0.70-1.00 S TG4241 0.020 0.020 0.030 0.030 CHEMICAL COMPOSITION (%) 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 O O ANNEALING : Annealing temperature: 860-880 C, keep this temperature by 2-4 hours, then cooling to 600 C in the speed of less than O O 30 C/h If after cold drawn precess, suggest add stress relieving annealing process Under the temperature of 600-700 C, keep this temperature by 2 houres. Quenching & Tempering (salt bath) QUENCHING : Pre-heating in two steps : O O Heating temperature under : 400-500 C and 850-900 C O Austenitizing temperature : 1150-1180 C O O TG4241 austenitizing temperature: 1160 C-1190 C O Heating coefficient 10-15 sec/mm, quenching under 580-620 C, then cooling to room temperature. O Quenching temperature difference in 5-10 C between TGM2, TGM2A; TGM2A's quenching temperature is higher than TGM2 TEMPERING : O Tempering temperature under : 540-560 C, tempering 3 times, each time 1 hour, then cooling to room temperature. HEAT TREATMENT 12