ASTM4140 alloy constructional steel

1.ASTM4140 2.High strength and Good toughness 3.High quenching degree and creep strength 4.ISO9001

ASTM4140 carbon constructional quality steel:4140

executive standard:ASTM A29/A29M-04

ACharacteristics and application scope:

     Its quench-hardening ability, high strength, toughness, and hardened little deformation, the high temperature is high creep strength and enduring strength. Used for manufacturing requirements is 35 Cr Mo steel strength higher and conditioning section more forgings, such as the locomotive traction in the big gear, gear, rear axle, supercharger load great rods and a spring clips, also can be used for 2000 m below oil deep well drilling pipe joint and fishing tools, etc.

Bchemical composition:

    C :0.38~0.43

   Si:0.15~0.35

   Mn:0.75~1.00

   S :Allow residual content ≤0.040

   P :Allow residual content ≤0.030

   Cr:0.80~1.10

   Ni: Allow residual content ≤0.030

   Cu:Allow residual content ≤0.030

    Mo: 0.15~0.25

Cmechanical property:

tensile strengthσb (MPa):≥1080(110)

yield strength σs (MPa):≥930(95)

elongation     δ5 (%):≥12

relative reduction in area ψ (%):≥45

Impacting Energy Akv (J):≥63

notched bar impact strength αkv (J/cm2):≥78(8)

hardness:≤217HB

size of sample: 25 mm

DHeat treatment standard and metallographic organization:

heat treatment regime: quench,850°C, oil cooling;tempering,560°C, water cooling, oil cooling.

metallographic organization:tempered sorbite.

Econdition of delivery:To heat treatment (is fire, annealed or high temperature tempering) or not heat treatment state delivery, delivery status should be indicated in the contract.

ASTM4140 alloy constructional steel