15CrMn 

 15CrMn 
 15CrMn, is a Chinese national standard alloy structural steel grades. Uniform digital code: A22152. Standard: GB / T 3077-1988 JIS G4053: 2003 A29M: 2005 ISO 683-18:1996 chemical composition of the mass fraction (%): C C: 0.12 ~ 0.18 Si Si: 0.17 ~ 0.37 Manganese Mn: 1.10 ~ 1.40 S S: allow the residual phosphorus content ≤ 0.035 P: ≤ 0.035 to allow the residual chromium content of Cr: 0.40 ~ 0.70 Ni: to allow the residual content ≤ 0.030 Copper Cu: ≤ 0.030 to allow the residual content 
 Mechanical Properties 
 [Sample size] 15mm [blank] quenching heat treatment temperature (℃): 880; Coolant: Oil-tempered heating temperature (℃): 200; coolant: water, air and mechanical properties] [tensile strength σb (MPa) : ≥ 785 (80) yield strength σs (MPa): ≥ 590 (60) Elongation δ5 (%): ≥ 12 Reduction of area ψ (%): ≥ 50 Impact energy Akv (J): ≥ 47 impact toughness αkv (J/cm2): ≥ 59 (6) Brinell hardness (HBS100/3000) (annealing or tempering state): ≦ 179 
 Key Features 
 Is a good hardenability carburizing steel. High surface hardness, good wear resistance. Can be used instead 15CrMo. Have a good process and welding properties, in 500 ~ 550 ℃ under high rupture strength. Temperature exceeds 550 ℃, deterioration of oxidation resistance, creep strength significantly. Long period of 500 ~ 550 ℃, the strength of steel to reduce the heat, the intensity decreased. 510 ℃ for the manufacture of high-, medium-pressure steam pipe, sets boxes and wall temperature of 550 ℃ superheater and forgings. 
 Application examples 
 For the manufacture of gears, worm gear, plastic mold, and steam turbine shaft seals, etc.