TGK SPECIAL STEEL PVT. LTD. - HANDBOOK

The Name You Can Trust www.tgkssl.com - 11 - 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. TG Chemical Analysis Typical Value % (Min - Max) Delivery Condition TGM-2A C S P Si Mn Nb Cr Mo V W other Heat Treatment Hardness 0.83- 0.85 Max 0.010 Max 0.030 0.30- 0.40 0.20- 0.40 0.10- 0.12 3.90- 4.20 4.80- 4.85 1.80- 1.90 6.00- 6.20 *** Annealed <255 Steel Grade (TG M-2A (Special Grade for Taps) Steel properties: Comparing to M2, Grade TGM2A has low percentage of carbon, added Niobium. With low percentage of carbon to increase toughness, and Niobium added to fined crystal grains of steel to obtain high strength and toughness. This grade is specially suitable for tabs of thread tools. Material: Forged/Hot Rolled round bars - Spherodized annealed - Grinding/turned/peeled. Chemical Composition: (%) PRODUCTION PROCESS: EAF LF VD ESR BLOOM IN FOLLOWING MACHINE : QUICK FORGING (12.5MN), HAMMER, PRECISION FORGING Precision Forging Hot Rolled & Annealed Peeled Cold Draw / Sand Blasted Cold Drawn Centerless Ground : 81-255mm : 14.5-80.0mm : 2.0-13.5mm : 2.0-14.4mm SIZE : Rounds Cold Drawn/Ground Bar 2.0 - 14.4mm 14.5-80.0mm Hot Rolled Annealed & Peeled 81.0-255.0mm 2.0-13.5mm Forged+Annealed+Turned Bar Coil UNDER ANNEALED CONDITION: Hardness : Max. 255HB STRAIGHTNESS: Max. 2.0 mm/m OVALITY : 1/2 *TOLERANCE NON-METALIC INCLUSIONS : Acc. to ASTM E 45 method A th. 1,0 / heavy 0.5 - B th. 1.0 / heavy 0,5 - C th. 1,0 / heavy 0,5 - D th. 1.5 / heavy 0.5. MICROSTRUCTURE: Acc. to SEP 1615 16mm < 16-25mm < 25-40mm < 40-63mm < 63-100mm < 100-160mm < 160-200mm < A B C 1B A B C 2B A B C 3B A B C 4B A B C 5B A B C 6A, 5B A B C 7A, 6B TG Stage GRAIN SIZE: The grain size ( ASTM ) should be 10~11.5# ULTRASONIC TEST: According to SEP 1921 class E/e/3, 100% scanning. HIGH SPEED STEEL