C45 is the same material your supplier may list as AISI 1045 or JIS S45C. This page maps the designations across standards and gives the ISO P-group machining starting point, brand-neutral.
| System | Designation |
|---|---|
| EN (EU) | C45 |
| Werkstoffnummer | 1.0503 |
| AISI / ASTM / UNS (US) | AISI 1045 (UNS G10450) |
| JIS (Japan) | S45C |
Compiled from the public standard designation systems (EN 10027, SAE/AISI, ASTM, UNS, JIS). Entries marked “nearest” are the closest commonly-cited counterpart, not a drop-in equivalent. Always verify against the material certificate.
The benchmark P-group steel: predictable chips, wide speed window. Normalised C45 machines freely with a general-purpose CVD-coated grade at mid-range data.
| ISO group | Starting Vc (coated carbide, turning) | Feed fn |
|---|---|---|
| P P · Steel | 150–350 m/min · 490–1150 sfm | 0.1–0.5 mm/rev · .004–.020 ipr |
Group-level starting range from our speeds & feeds guide; convert to RPM with the speeds & feeds calculator. Condition, subgroup and operation shift the number — the material page has the detail: ISO P · Medium-carbon steel.
Related materials: C60 / AISI 1060
C45 (Werkstoffnummer 1.0503) corresponds to AISI 1045 (UNS G10450). In JIS terms the counterpart is S45C.
It is an ISO P-group material, so the starting window is 150–350 m/min · 490–1150 sfm at 0.1–0.5 mm/rev · .004–.020 ipr for coated-carbide turning, adjusted for condition and operation. For a grounded, brand-neutral pick — grade, geometry and cutting data across 13 brands — ask the advisor.
They designate the same composition under different systems, but the drawing standard governs: certificates, tolerances and delivery-condition requirements differ between standards even for equivalent chemistry. Substitute only with the certificate in hand.
Knowing the material is half the job; picking the grade and cutting data for the operation is the other half. That is what the advisor does, grounded in catalog data and honest when there is no verified match.