TGK SPECIAL STEEL PVT. LTD.

COLD WORKING TOOL STEEL TG A8M Extremely high quenching, strong hardening, high abrasion performance and extremely high compression strength. 1) EAF + LF + VD ; 2) ESR + LF + VD + ESR SMELTING METHOD MAIN CHARACTERISTICS O 20 ~ 400 C Room temperature 3 density (Kg/m ) 7.67 Specific heat of room temperature (J/Kg.K) O 200 C thermal l conductivity (W/mK) Elastic mouldus 2 (N/mm ) -6 Linear expansivity (x10 K) 460 20 210,000 12 12.9 O 20 ~ 200 C PHYSICAL PROPERTY Coarse 1.5 Class A 1.5 1.0 Class B Class C Class D Fine Coarse Fine Coarse Fine Coarse Fine 2.0 1.5 1.5 1.0 1.5 ELECTRIC FURNACE STEEL ULTRASONIC FLAW DETECTION Electric furnace steel: flaw detection standard: as per SEP1921 - D/d flaw detection or GB/T6402-2008 Class 3, or as per customer requirements. Electroslag Steel: flaw detection standard: as per SEP1921 - E/e flaw detection or GB/T6402-2008 Class 4, or as per customer requirements Purity. MAJOR APPLICATIONS  Bearing small impact load during manufacturing, highly resistant cold punching, cold shearing cutting, drill sleeves, gages, wire drawing dies, screw plates, drawing dies, screw thread rolling dies, and other dies. CHEMICAL COMPOSITION (%) C Mo Mn P W 2.05 V *** S *** *** 0.3 0.030 Si 0.25 Cr 11.5 0.010 SUPPLY SPECIFICATION PRODUCT NAME SUPPLY SPECIFICATION OF ELECTRIC FURNACE STEEL/mm 70 ~ 500mm Coarse 1.0 Class A 1.0 0.5 Class B Class C Class D Fine Coarse Fine Coarse Fine Coarse Fine 1.5 1.0 1.0 1.0 1.5 ELECTROSLAG STEEL DELIVERY STATE 1) Delivery hardness: delivery under annealing state, 255HB; 2) Unevenness of eutectic carbide shall comply with BOHLER standard. SUPPLY SPECIFICATION OF ELECTROSLAG STEEL/mm Forged Round Bar Forged Module Rolled Round Bar Rolled Flat Bar Small Flat Steel Sheet Metal (120~200) x (300~620) 16 ~ 70 (12~120) x (200~630) 70 ~ 500mm (120~350) x (300~810) 16 ~ 70 (12~120) x (200~810) Small flat steel of various specifications with thickness under 30mm and width of 150mm Sheet metal with thickness under 10mm THERMAL TREATMENT Softening annealing Quenching Tempering O Heating to 830~880 C for heat insulation; and cooling slowly O 950~980 C quenching, oil cooling O 180~200 C twice tempering, HRC60~62 Tempering temperature and hardness relation curve 36