35Cr alloy structural steel
35cr welding process
35Cr, alloy structural steel. Unified digital code: A20352
Chemical composition
Standard: GB / T 3077-1988
[] Chemical composition (mass fraction) (%)
Carbon C: 0.32 ~ 0.39
Si Si: 0.17 ~ 0.37
Manganese Mn: 0.50 ~ 0.80
Sulfur S: to allow the residual content of ≤ 0.035
Phosphorus P: allow the residual content ≤ 0.035
Chromium Cr: 0.80 ~ 1.10
Ni: to allow the residual content of ≤ 0.030
Copper Cu: to allow the residual content of ≤ 0.30
[Mechanical properties]
Blank sample size (mm): 25
Heat treatment: the first quenching temperature (℃): 860; Coolant: Oil the second quenching temperature (℃): - tempering heating temperature (℃): 500; coolant: water, oil
Tensile strength σb (MPa): ≥ 930 (95)
Yield strength σs (MPa): ≥ 735 (75)
Elongation δ5 (%): ≥ 11
Reduction of area ψ (%): ≥ 45
Impact energy Akv (J): ≥ 47
Impact toughness αkv (J/cm2): ≥ 59 (6)
Brinell hardness (HBS100/3000) (annealing or tempering condition): ≦ 207 Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be in the contract note out.
[Main features]
This steel and 30Cr steel with high strength and toughness are carbon alloy quenched and tempered steel, the ultimate strength of grade 35 steel than the corresponding 20%, slightly higher hardenability than 30Cr, and 30Cr performance and other similar processes.
[Application Examples]
For the manufacture of gears, shafts, rollers, bolts and other important conditioning parts, use basically the same with 30Cr.
