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41CrS4

1.7039
alloy_steelquenched_tempered
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Free-cutting variant of 41Cr4 (1.7035) — sulfur addition (0.020-0.040%) for improved chip formation on CNC automatics. Same mechanical properties as 41Cr4 after Q&T. UTS 900-1100 MPa. Used for high-volume automotive shafts, bolts, spindles, and connecting rods on automatic lathes. Most popular Cr-only QT steel for CNC mass production.

International equivalents

FlagStandardCountryGradeNumberMatch
🇺🇸AISIUSAAISI 5140 (approx, no S)—REF
🇪🇺ENEurope41CrS4 / 1.70391.7039100%

Sources: ASTM A29, EN 10083-3

Chemical composition comparison (wt%)

Side-by-side: 41CrS4 (EN 10083-3) vs 41CrS4 / 1.7039 (EN) (EN 10083-3)

Element41CrS4 (EN 10083-3)41CrS4 / 1.7039 (EN)Overlap
C—0.38–0.45%—
Si—0–0.4%—

Mechanical properties

Compatibility verdict

41CrS4 and 41CrS4 / 1.7039: 100% composition match

Related materials

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🇪🇺 16MnCr5🇫🇷 16MC5🇨🇳 16MnCr5🇯🇵 SCr415
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