37CrS4
1.7038Free-machining variant of 37Cr4 with controlled sulfur addition (0.020–0.040%) for improved chip-breaking during automated machining. Chromium steel with good hardenability for medium cross-sections. Same mechanical properties as 37Cr4 after quenching and tempering. Used for automotive and mechanical engineering components: shafts, connecting rods, crankshafts, and bolts.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 5135 | — | REF |
| 🇫🇷 | AFNOR | France | 38C4 | — | 95% |
Sources: ASTM A29, NF EN 10083-3
Mechanical properties
Compatibility verdict
37CrS4 and 38C4: 95% composition match
Related materials
40CrMoV4-6
1.7711Chromium-molybdenum-vanadium creep-resisting steel for high-temperature fasteners and bolts per EN 10269. Excellent creep resistance up to 540°C with tensile strength 850–1000 MPa after quenching and tempering. Widely used for steam turbine bolts, pressure vessel fasteners, and power generation components. Equivalent to ASTM A193 Grade B16.
33CrMoV12-9
1.8522Premium nitriding steel with high chromium content (2.8–3.3%) providing exceptional surface hardness after gas or plasma nitriding (up to 900 HV). Excellent core strength (900–1100 MPa tensile) with good toughness. Used for gears, crankshafts, cylinders, spindles, and precision machine components in aerospace, automotive, and power generation. Also known as 32CDV13 (AFNOR) and AMS 6481.
14NiCrMo13-4
1.6657High-nickel case-hardening steel for heavily loaded large gears, shafts, and drivetrain components. Excellent core toughness with case hardness up to 62 HRC after carburizing. The high nickel content (3.0–3.5%) provides superior impact resistance even at low temperatures. Standard material for wind turbine gearboxes, heavy-duty industrial gears, and aerospace transmissions. Also known as EN36C (BS) and similar to SAE 9310.
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