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ASTM 4340

ASTM 4340

ASTM 4340 Alloy Steel
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ASTM 4340 Alloy Steel



Material Name


Material Name: ASTM 4340
Execution standard: ASTM A29/A29M-04


Chemical Composition


Mn S P
 		Cr Ni Cu
 Mo
0.70-0.90
 Max 0.040 Max 0.035
 0.60～0.90 1.65～2.00 Max 0.025 0.20～0.30

Mechanical Properties


Tensile strength
σb (MPa) 		Yield Strength
σs 0.2 (MPa)
Elongation
δ 5 (％)
reduction of crosssection area
ψ (％)
 ballistic work
Akv (J) 		pounding toughness value
αkv (J/cm2)
Hardness
(HB)
specimen size
Min 980 Min 835 Min 12 Min 55
 Min 78
 9Min 78
   Max 269 25mm

specification of heat treatment and metallurgical structure


Specification of heat treatment : hardening 850℃ oil cooling, tempering 600℃ water cooling, oil cooling.

Delivery State


In the heat treatment (quenching, annealing or tempering) or heat treatment delivery, delivery status should be indicated in the contract.