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Shanghai Jingteng Metal Group Co., Ltd.

   
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SMn438 Alloy Steel

SMn438 Alloy Steel

SMn438 Alloy Steel
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SMn438 Alloy Steel



Material Name


Material Name: SMn438
Execution standard: JIS G4053-2003

Characteristics and scope of application


high strength, ductility and wear resistance, but the cold deformation plasticity is not high, poor weldability. used in heavy load of tempering parts, such as shaft, axle shaft, crankshaft, axle, screw, worm, piston rod, joystick, a lever, a connecting rod, load of bolts, screw, the reinforcing ring, spring, when used as a diameter of 40 mm in the following small section important parts, which is equal to 40Cr steel.


Chemical Composition 


C Si Mn S P Cr Ni Cu
0.35～0.41 0.15～0.35 1.35～1.65 Below 0.030 Below 0.030
 Below 0.35 Below 0.25 Below 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 
Above 885 Above 735 Above 12
 Above 45
 Above 55
 Above 69
   Below 217 25mm



specification of heat treatment and metallurgical structure

 
Specification of heat treatment : hardening 840℃ water cooling, tempering 540℃, water cooling.

Delivery State


Heat treatment (normalizing, annealing or high temperature tempering) or non heat treatment state of delivery, the delivery state should be indicated in the contract.