C15 equivalent grades: ASTM, EN, JIS, GB, DIN
C15 is unalloyed case-hardening steel specified in EN 10084. Every grade in the database that can stand in for it is listed below, drawn from 6 standard systems, each with the reason it does or does not match exactly. The full C15 data sheet carries the composition and mechanical tables.
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C15 is cross-certified with 1015, 080M15, 15 and 2 more: the composition windows overlap closely enough that one certificate satisfies the other. 1018, C10, C10 sit one step away, differ in a strength minimum or in the quality class rather than in the metallurgy. 16MnCr5, S235JR serve the same purpose without being the same steel, so a substitution there needs the design re-checked rather than the certificate. The cross-reference below covers 2 in AISI / SAE, 1 in BS (superseded British), 1 in GB/T (China), 1 in GOST (Russia/CIS), 1 in JIS (Japan), 4 in EN (European).
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| 080M15 | BS (superseded British) | Identical | BS 970 080M15: C 0.13–0.18, Mn 0.70–1.00 (Mn higher).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. |
| C10 | 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, near and functional are defined once on the grade index; the reason column below says which limit differs in each case.
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)
- C10 — 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.