TGK SPECIAL STEEL PVT. LTD. - HANDBOOK

The Name You Can Trust www.tgkssl.com - 19 - 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 (TGM42) Smelting method: 15T intermediate frequency furnace +LF+VD+ESR Main characteristics: High steel hardness, reaching 68HRC after quenching and tempering, favorable hot hardening, capable of manufacturing various complicated tools with high precision. Major applications:  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. Chemical constituent %: C Si Mn W Cr Mo V Co P S 1.08 0.3 0.3 1.45 3.95 9.40 1.15 7.85 ≤0.020 ≤0.001 O (ppm) N (ppm) H (ppm) ≦ 15 ≦ 100 ≦ 2.5 Physical property: Room temperature density (Kg/m 3 ) Specific heat of room temperature J/KgꞏK) 200ºC thermal conductivity (W/m•K) Elastic modulus (N/mm 2 ) Linear expansivity (×10 -6 K) 20~200ºC 20~400ºC 8.01 460 19.00 220,000 10.8 11.6 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