Implementation of standards
China Standard: GB/T3077-1999
Japanese Standard: JIS G4053: 2003
American Standard: A29M: 2005
International Standard: ISO 683-18:1996
Chemical composition
Mass fraction (%):
C: 0.37 ~ 0.44
Si: 0.17 ~ 0.37
Mn: 0.50 ~ 0.80
Cr: 0.45 ~ 0.75
Ni: 1.00 ~ 1.40
Mechanical properties
Blank sample size
25mm
Heat treatment
Quenching temperature (℃): 820; Coolant: Oil
Tempering heating temperature (℃): 500; coolant: water, oil
Mechanical properties
Tensile strength (σb / MPa): 980
Yield point (σs / MPa): 785
Elongation (δ5 /%): 10
Reduction of (ψ /%): 45
Impact absorbed energy (Aku2 / J): 55
Brinell hardness (HBS100/3000) (annealing or tempering state): 241
Key Features
Carbon alloy quenched and tempered steel. High strength, high toughness and high hardenability. In the quenched state, good mechanical properties, good low temperature impact toughness. A tendency to temper brittleness, water easy to crack. Good machinability, but the poor welding. Used in the quenched state.
Application examples
For the manufacture of forging and cold pressing and important section of a larger size of the quenched parts, such as connecting rod, disc, crankshaft, gears, shafts, screws, etc.
