What is the composition of SAE 4118 Chromium-Molybdenum Steel?

Published composition ranges are not available for SAE 4118 Chromium-Molybdenum Steel in this record. PARTIAL - parsed from a truncated 500-char source excerpt; the element set is INCOMPLETE and must NOT be used for validation, specification or purchasing

What standards cover SAE 4118 Chromium-Molybdenum Steel?

The governing standards for SAE 4118 Chromium-Molybdenum Steel include SAE J404, ASTM A29, UNS G41180. Mill certificates typically call out the most specific AMS or ASTM number applicable to the product form.

What is SAE 4118 Chromium-Molybdenum Steel used for?

This alloy is used in applications demanding the property set described in its family: low_alloy_steel.

How do I verify a mill certificate for SAE 4118 Chromium-Molybdenum Steel?

Compare each element value on the certificate against the min/max ranges in the spec table above. Paste the values into the SpecBase validator to get an automated pass/fail check.

SAE 4118 Chromium-Molybdenum Steel

UNS G41180 low_alloy_steel

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Quick answer

SAE 4118 Chromium-Molybdenum Steel is a low alloy steel specified by SAE J404, ASTM A29, UNS G41180. Typical composition: .

SAE 4118 is a low-alloy chromium-molybdenum steel known for its good hardenability and strength. It is typically used in case-hardened applications where a tough core and a hard wear-resistant surface are required.

Applicable Standards

SAE J404
ASTM A29
UNS G41180

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