TGK SPECIAL STEEL PVT. LTD.

21 TGE 21 This steel grade is a high toughness and high thermal stability hot work mold steel designed with optimized alloy composition, while also possessing high purity. Application field: Suitable for various types of aluminium die-casting molds and high hardness plastic molds. Common applications include hot extrusion molds, forging molds and punches, plastic molds, etc. It is also commonly used in engine mold manufacturing. PRODUCT DESCRIPTION SIZE SUPPLIED Product Forged Round (mm) Plate (mm) 70~800 (120~800) x (600~1400) DELIVERY STATUS Typical soft annealing hardness is under 220HB. MICROSTRUCTURE AS POWDERED (1) Annealed microtissues were detected according to NADCA # 207-2016 standard to achieve acceptable tissue (AS1-AS4) (2) Brand tissue: Test the strip tissue according to NADCA # 207- 2016 standard to reach the acceptable level. CHEMICAL CLEANLINENESS Type A THIN Type B Type C Type D THICK THICK THIN THIN THICK THICK THIN 0.5 0.5 1.0 0.5 1.0 0.5 1.0 0.5 MICROSTRUCTURE MOLD STEEL SERIES CHEMICAL COMPOSITION (%) C S Cr 0.35 V Mn 0.40 5.00 0.50 Si 0.25 Mo 1.75 P 0.001 0.010 MECHANICAL PROPERTY O The sample was kept at 1010-1030 C for 30 minutes and quenched O in oil. Temper at least 2 times at 560-610 C to ensure a hardness of 45 ± 2HRC. Remove the highest and lowest values from the 5 samples and calculate the average value. The average impact value of Charpy V-notch (10*10*55) should be 23J. SOFT ANNEALING: O Soft annealing in a protective atmosphere at 860 C for 3-5h, O O followed by slow cooling at 10 C /h down to 500 C, then air cooling. ULTRASONIC INSPECTION According to SEP1921-E/e standard According to GB/T6402-2008 standard grade 4 According to customer requirements PHYSICAL PROPERTIES 3 (1) Density (p) : 7.8g/cm 2 (2) Modulus of Elasticity (E) (KN /mm ) 0 Temperature/ C 0.5mm to 12mm 25 210 400 180 600 145 0 Temperature/ C  25 31 400 31 600 32 0 Temperature/ C  m 20 11.4 400 12.7 600 13.3 (3) Thermal Conductivity (  ) (W/m  K)) -6 0 (4) Thermal Expansions (  ) (X 10 / C) m Annealed Structure: AS1 Segregation: SA1 GUIDELINES FOR HARDENING CCT CURVE