C15 equivalent grades: ASTM, EN, JIS, GB, DIN
Cross-reference for C15 across standard systems. Each match is graded so you can see how safe the substitution is. Unalloyed case-hardening steel — full C15 data sheet.
Cross-reference table
| Grade | System | Match | Why / differences |
|---|---|---|---|
| 1015 | AISI / SAE | Identical | AISI/SAE 1015 (G10150): C 0.13–0.18, Mn 0.30–0.60 — same window as C15. 1016/1018 have higher Mn (0.60–0.90) for slightly better hardenability. |
| 080M15 | BS (superseded British) | Identical | BS 970 080M15: C 0.13–0.18, Mn 0.70–1.00 (Mn higher). |
| 15 | GB/T (China) | Identical | GB/T 699 grade 15 (15#): C 0.12–0.18, Mn 0.35–0.65. |
| 15 / 15kp | GOST (Russia/CIS) | Identical | GOST 1050 Steel 15: C 0.12–0.19, Mn 0.35–0.65. |
| S15C / S15CK | JIS (Japan) | Identical | JIS G4051 S15C: C 0.13–0.18, Mn 0.30–0.60; S15CK is the case-hardening quality (P/S ≤ 0.025). |
| 1018 | AISI / SAE | Near | C 0.15–0.20, Mn 0.60–0.90; the US stock grade most often supplied against a C15 request. |
| C10E | EN (European) | Near | 1.1121 (ex Ck10): C 0.07–0.13 — softer core, better cold-heading. |
| C10 | EN (European) | Near | Next carbon step (0.12–0.18 %) with slightly stronger core. |
| 16MnCr5 | EN (European) | Functional | Alloyed case-hardening steel for larger sections and higher core strength. |
| S235JR | EN (European) | Functional | Structural steel of similar carbon; not a case-hardening quality (no hardenability or cleanliness control). |
Identical = same composition and mechanical limits within rounding. Near = one limit differs (e.g. carbon max or impact temperature). Functional = interchangeable for most uses after an engineering check.
How the matches are graded
Identical means the chemical composition windows overlap so that material certified to one specification meets the other without deviation, and the mechanical minimums are the same or the other is inside them — mills usually dual-certify. Near means one limit differs (a carbon maximum, an impact temperature, a strength minimum or a delivery condition) and a substitution needs a one-line engineering check. Functional means the grades serve the same purpose but are not the same steel — a designer can often use one for the other, but only after re-checking the design.
C15 in AISI / SAE
- 1015 — Identical AISI/SAE 1015 (G10150): C 0.13–0.18, Mn 0.30–0.60 — same window as C15. 1016/1018 have higher Mn (0.60–0.90) for slightly better hardenability.
- 1018 — Near C 0.15–0.20, Mn 0.60–0.90; the US stock grade most often supplied against a C15 request.
C15 in BS (superseded British)
- 080M15 — Identical BS 970 080M15: C 0.13–0.18, Mn 0.70–1.00 (Mn higher).
C15 in GB/T (China)
- 15 — Identical GB/T 699 grade 15 (15#): C 0.12–0.18, Mn 0.35–0.65.
C15 in GOST (Russia/CIS)
- 15 / 15kp — Identical GOST 1050 Steel 15: C 0.12–0.19, Mn 0.35–0.65.
C15 in JIS (Japan)
- S15C / S15CK — Identical JIS G4051 S15C: C 0.13–0.18, Mn 0.30–0.60; S15CK is the case-hardening quality (P/S ≤ 0.025).
C15 in EN (European)
- C10E — Near 1.1121 (ex Ck10): C 0.07–0.13 — softer core, better cold-heading.
- C10 — Near Next carbon step (0.12–0.18 %) with slightly stronger core.
- 16MnCr5 — Functional Alloyed case-hardening steel for larger sections and higher core strength.
- S235JR — Functional Structural steel of similar carbon; not a case-hardening quality (no hardenability or cleanliness control).
Superseded names for C15
- Ck15 — DIN 17210 (withdrawn): = C15E (1.1141). The common German workshop name.
- C15 (1.0401) — DIN 17210 / DIN 17200: Base quality, unchanged number.
- Cm15 — DIN 17210: = C15R (controlled S).
- 080M15 / 080A15 — BS 970
- XC15 / XC18 — NF A 35-551
Key data for C15
Full composition, mechanical properties by thickness, heat treatment and applications for C15 →
Verified against EN 10084:2008. Last checked: September 2026.