ASTM4340 alloy constructional steel

ASTM4340 Alloy Constructional Steel High strength and tenacity, good hardenability ISO 9001:2008 certificated

ASTM4340 alloy constructional steel:4340

executive standard:ASTM A29/A29M-04

A.chemical composition:

       C :0.38~0.43

       Si:0.15~0.35

       Mn:0.60~0.90

       S :Allow residual content ≤0.040

       P :Allow residual content ≤0.035

       Cr:0.60~0.90

       Ni:1.65~2.00

       Cu:Allow residual content ≤0.025

       Mo:0.20~0.30

B.  mechanical property:

tensile strengthσb (MPa):≥980(100)

yield strength σs (MPa):≥835(85)

elongation     δ5 (%):≥12

relative reduction in area ψ (%):≥55

Impacting Energy Akv (J):≥78

notched bar impact strength αkv (J/cm2):≥98(10)

hardness:≤269HB

size of sample: 25 mm

C. Heat treatment standard and metallographic organization:

heat treatment regime: quench,850°C, oil cooling;tempering,600°C water cooling, oil cooling

D.  condition of delivery:With no heat treatment or heat treatment (annealing, is fire or high temperature tempering) state delivery. Requirements of the state should be in heat treatment delivery indicated in the contract.

ASTM4340 alloy constructional steel