Specification :

Alloy structural steel: 42CrMo4( 1.7225)
Carries out the standard: EN 10083/ 1-1991
* characteristic and applicable scope:
The intensity, the hardenability are high, toughness is good, when quenching distorts is small, when high temperature has the high creep strength and the long-term strength. Uses in making requests to compare the 35CrMo steel intensity to be higher and a quenching and tempering section bigger forging, like the locomotive hauling uses bull wheel, pressure intensifier transmission gear, hind axle, load enormous connecting rod and spring clip, may also use in below 2000m the petroleum deep well drilling rod coupling and the fishing tool and so on.
* chemical composition:
Carbon C: 0.38~ 0.45
Silicon Si: d0.40
Manganese Mn: 0.60~ 0.90
Sulfur S: Permits the remaining content d0.035
Phosphorus P: Permits the remaining content d0.035
Chromium Cr: 0.90~ 1.20
Nickel Ni: Permits the remaining content d0.030
Copper Cu: Permits the remaining content d0.030
Molybdenum Mo: 0.15~ 0.30
* mechanical properties:
Tensile strength à b ( MPa) : e1080( 110)
Yield strength às ( MPa) : e930( 95)
Elongation ratio ´ 5 ( % ) : e12
Reduction of area Psi ( % ) : e45
Impact merit Akv ( J) : e63
Resilient value ± kv ( J/ cm2) : e78( 8)
Degree of hardness: d217HB
Test specimen size: The test specimen blank dimension is 25mm
* heat treatment regime and Microstructure:
Heat treatment regime: Quenching 850 , the oil is cold; The tempering 560 , the water cooling, the oil are cold.
Microstructure: Tempering sorbite. Nickle Chromium Moly Steel, 42CrMo4( 1.7225) , AISI 4340, BS 705, SNCM 439, VCN150, High Tensile Alloy .Diameter 100 mm-990 mm