TGK SPECIAL STEEL PVT. LTD. - HANDBOOK

The Name You Can Trust www.tgkssl.com - 29 - Descriptions and data in the file are typical cases. We will not make guarantee for them. Besides, we reserve the final right to interpret improvement in materials, quality and/or performance. Steel grade (W18) Smelting method: 15T intermediate frequency furnace +LF+VD+ESR Main characteristics: W18 is high-speed tool steel of tungsten system. It’s featuring with extremely high abrasion resistance, softening performance, favorable tenacity and cutting performance, as well as competency. Major applications:  Turning, chipping and slotting tools, spiral drills, thread drilling, contour cutting tools, broaching tools, reamers. Chemical constituent %: C Si Mn W Cr Mo V Co P S 0.78 0.35 0.30 17.95 4.15 ≤0.30 1.10 - ≤0.028 ≤0.010 Physical property: Room temperature density (Kg/m 3 ) Specific heat of room temperature (J/Kg·K) 20ºC thermal conductivity (W/m•K) Elastic modulus (N/mm 2 ) Linear expansivity (×10 -6 K) 20~200ºC 20~400ºC 8.70 0.46 19.0 217,000 11.1 11.7 Ultrasonic flaw detection: As per SEP1921 D/d or customer requirements. Purity: Class A Class B Class C Class D Fine Coarse Fine Coarse Fine Coarse Fine Coarse 0.5 0.5 0.5 0.5 0.5 0.5 1.0 0.5 Delivery state: (1) Delivery under balling annealing state, delivery hardness ≤269HB. PRODUCTION PROCESS: EAF LF VD ESR BLOOM IN FOLLOWING MACHINE : QUICK FORGING (12.5MN), HAMMER, PRECISION FORGING Precision Forging Hot Rolled & Annealed Peeled Cold Drawn / Sand Blasted (Coil) Cold Draw / Centreless Ground : 81-255mm : 14.5-80.0mm : 2.0-13.5mm : 2.0 -14.4mm SIZE : Rounds Cold Drawn/Centreless Ground Bar 2.0 - 14.4mm 14.5-80.0mm Forged Bar & Turned Hot Rolled Annealed Peeled Coil 81.0-255.0mm 2.0 - 13.5mm SIZE : Flats Thickness 5mm-150mm Width 5mm-810mm SIZE : Sheets Thickness 0.5mm to 12mm Width 810mm Length 2500mm SIZE : Square 4mm to 100mm HIGH SPEED STEEL