Specifications of SCM440 Induction Hardened Chrome Plated Rod

 Induction hardening is a form of heat treatment in which a metal part is heated by induction heating and then quenched. The quenched metal undergoes a martensitic transformation, increasing the hardness and brittleness of the part. Induction hardening is used to selectively harden areas of a part or assembly without affecting the properties of the part as a whole. The hardening depth is 1.5-5mm; medium/low-frequency quenching may lead to excessive depth and negative effect on strength; high-frequency quenching generally result in a shallow depth, and may ensure the balance of hardness and strength.

AISI SAE 4140 alloy steel is a chromium molybdenum alloy steel specification widely used in general purpose high tensile steel for components, like cylinder rod, shafts, bolts, gears and other applications. 

Common 4140 Steel Specifications

CountryUSAGermanBritishJapanChinaAustralia
StandardASTM A29DIN 17200BS 970JIS G4105GB/T 3077AS 1444
Grades41401.7225/
42crmo4		42CrMo4SCM44042CrMo4140

3. 4140 Steel Bar Chemical Composition

StandardGradeCMnPSSiNiCrMo
ASTM A2941400.38-0.430.75-1.000.0350.0400.15-0.35–0.8-1.100.15-0.25
EN 1025042CrMo4/
1.7225		0.38-0.450.6-0.90.0350.0350.4–0.9-1.20.15-0.30
JIS G4105SCM4400.38-0.430.60-0.850.030.030.15-0.35–0.9-1.20.15-0.30

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