Can SCM440 replace 42CrMo4 on an EN drawing?

Composition and properties overlap; with a 3.1 certificate showing EN-comparable values, substitution is commonly accepted — confirm with the design authority for certified parts.

Grades · Alloy & Engineering Steel · SCM440

SCM440

Data verified

SCM440 is the JIS Cr-Mo steel matching 4140/42CrMo4 — the designation on Japanese, Korean and Taiwanese certificates for the same class of machinery steel.

Hardness28–38 HRC typical

DIN1.7225 (42CrMo4)

AISI4140

JISSCM440

CategoryAlloy & Engineering Steel

Chemical composition

Element	Content (%)
C	0.38–0.43
Si	0.15–0.35
Mn	0.60–0.90
Cr	0.90–1.20
Mo	0.15–0.30

Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.

Properties

Hardness (Q&T)	28–38 HRC typical
Tensile strength	≥980 MPa (Q&T reference)
Density	7.85 g/cm³

Heat treatment

Quench 850 °C oil; temper 550–650 °C.

Equivalent grades

Standard	Designation
din	1.7225 (42CrMo4)
aisi	4140
jis	SCM440
gb	42CrMo

Compare side by side: SCM440 vs 4140 · SCM440 vs 42CrMo4

Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.

Applications & Processing

Applications: Shafts, gears, bolts, machine components across Asian supply chains.

Processing: As 4140/42CrMo4.

FAQ

Can SCM440 replace 42CrMo4 on an EN drawing?: Composition and properties overlap; with a 3.1 certificate showing EN-comparable values, substitution is commonly accepted — confirm with the design authority for certified parts.

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Source: JIS G4105 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.