TGK SPECIAL STEEL PVT. LTD. - HANDBOOK

The Name You Can Trust www.tgkssl.com - 25 - 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 (M4) Smelting method: 15T intermediate frequency furnace +LF+VD+ESR Main characteristics: M4 is high-speed tool steel of tungsten and molybdenum system with high vanadium. It has high hardness and excellent abrasion performance. Major applications:  Turning, chipping and slotting tools, spiral drills, thread drilling, contour cutting tools, broaching tools, reamers. Chemical constituent %: C Mn W Cr Mo V Co P S 1.33 0.40 5.60 4.15 4.60 3.95 - ≤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 7.97 440 20 226,000 10.4 11.3 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. Supply specification: Product name Specification Round bar Ø15~160mm HIGH SPEED STEEL