Chromium Cr: allow the residual content of ≤ 0.30
Ni: to allow the residual content of ≤ 0.30
Copper Cu: to allow the residual content of ≤ 0.30
Application examples
Most of the steel used in the quenched state, in cars, tractors and general machinery manufacturing, and more for stamping (4 ~ 11 mm steel plate) make the car beams, beams and transmission gear, shaft, bolt cold heading, larger cross-section of the quenched parts. In addition, this steel can be used as case-hardened steel, used to make the heart of the Ministry of carburized parts require a higher intensity, such as mining cranes and the rear axle journal and so on.
Characteristics and Uses
Used as a connecting rod, spindle, crank, axle, lever, fan parts, cold forging diameter less than 15MM bolts to withstand a variety of important high stress mechanical parts. In the production of small cross section (diameter less than 20MM) parts can be replaced by 40Cr steel.
Mechanical properties
Blank sample size (mm): 25
Heat treatment:
The first quenching temperature (℃): 840; coolant: water
Second quenching temperature (℃): -
Tempering heating temperature (℃): 500; coolant: water
Tensile strength σb (MPa): ≥ 785 (80)
Yield strength σs (MPa): ≥ 635 (65)
Elongation δ5 (%): ≥ 12
Reduction of area ψ (%): ≥ 45
Impact energy Akv (J): ≥ 63
Impact toughness αkv (J/cm2): ≥ 78 (8)
Brinell hardness (HBS100/3000) (annealing or tempering condition): ≦ 207
Delivery status
Heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract.
