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SCr440

SCr440

SCr440 Alloy Steel
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SCr440 Alloy Steel




Material Name


Material Name: SCr440

Characteristics and scope of application


It is the most commonly used alloy structure steel, tensile strength, yield strength and quenching permeability were more than 40 steel high, but welding Limited, have a tendency to crack formation. Conditioning parts for the more important, such as working under alternating load parts, parts of the medium speed and medium load. After surface quenching can load and high wear resistance without the impact of a large parts, such as gear, sleeve, crank shaft, pin.


Chemical Composition


C Si Mn S P Cr Ni Cu
0.38-0.43
 0.15-0.35 0.60~0.90 Max 0.03 Max 0.03
 0.13-0.16 Max 0.25 Max 0.03

Mechanical Property


Tensile strength
σb (MPa) 		Yield Strength
σs 0.2 (MPa)
Elongation
δ 5 (％)
specimen size
reduction of crosssection area
ψ (％)
Hardness
(HB)
Min 980 Min 785 Min 9 25mm
 Min 45
   Max 207

specification of heat treatment and metallurgical structure


Specification of heat treatment : hardnening 850℃, oil cooling; tempering 520 ℃ water cooling, oil cooling.
Metallurgical Structure: tempered martensite

Delivery State


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