1018 equivalent grades: ASTM, EN, JIS, GB, DIN
1018 is low-carbon steel, cold-finished bar (case-hardenable) specified in ASTM A29. Every grade in the database that can stand in for it is listed below, drawn from 7 standard systems, each with the reason it does or does not match exactly. The full 1018 data sheet carries the composition and mechanical tables.
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1018 is cross-certified with 080A17: the composition windows overlap closely enough that one certificate satisfies the other. 1020, 1015 / 1010, C15 / C15E and 5 more differ on one limit only — a carbon ceiling, an impact temperature or a strength minimum. 12L14, A36 serve the same purpose without being the same steel, so a substitution there needs the design re-checked rather than the certificate. Across systems that is 1 in BS (superseded British), 3 in AISI / SAE, 3 in EN (European), 1 in GB/T (China), 1 in GOST (Russia/CIS), 1 in JIS (Japan), 1 in ASTM / ASME.
Cross-reference table
| Grade | System | Match | Why / differences |
|---|---|---|---|
| 080A17 | BS (superseded British) | Identical | BS 970 080A17: C 0.15–0.20, Mn 0.70–0.90. |
| 1020 | AISI / SAE | Near | C 0.18–0.23, Mn 0.30–0.60: slightly higher carbon, lower Mn; used interchangeably for many parts. |
| 1015 / 1010 | AISI / SAE | Near | Lower-carbon cold-heading grades. |
| C15 / C15E | EN (European) | Near | C 0.12–0.18, Mn 0.30–0.60 — lower Mn; the case-hardening equivalent. C16E (1.1148) and C20/C22 are also quoted. |
| S235JRC / C22 | EN (European) | Near | EN 10277 bright bar S235JRC (1.0122) is the general-purpose cold-drawn substitute; C22 (C 0.17–0.24) the closer chemistry. |
| C15 | EN (European) | Near | C 0.15–0.20, Mn 0.60–0.90; the US stock grade most often supplied against a C15 request. |
| 20 | GB/T (China) | Near | GB/T 699 grade 20 (20#): C 0.17–0.23, Mn 0.35–0.65 — slightly higher C, lower Mn. |
| 20 / 18kp | GOST (Russia/CIS) | Near | GOST 1050 Steel 20: C 0.17–0.24, Mn 0.35–0.65. |
| S15C / S17C / S20C | JIS (Japan) | Near | JIS G4051 S17C (C 0.15–0.20, Mn 0.30–0.60) is closest on carbon; S20C on strength. |
| 12L14 | AISI / SAE | Functional | Free-machining leaded steel for high-volume screw-machine parts (not weldable, not case-hardenable). |
| A36 | ASTM / ASME | Functional | Structural plate/shape with guaranteed 250 MPa yield — the alternative for welded structures; 1018 is a bar product with no guaranteed properties. |
Identical, near and functional are defined once on the grade index; the reason column below says which limit differs in each case.
1018 in BS (superseded British)
- 080A17 — Identical BS 970 080A17: C 0.15–0.20, Mn 0.70–0.90.
1018 in AISI / SAE
- 1020 — Near C 0.18–0.23, Mn 0.30–0.60: slightly higher carbon, lower Mn; used interchangeably for many parts.
- 1015 / 1010 — Near Lower-carbon cold-heading grades.
- 12L14 — Functional Free-machining leaded steel for high-volume screw-machine parts (not weldable, not case-hardenable).
1018 in EN (European)
- C15 / C15E — Near C 0.12–0.18, Mn 0.30–0.60 — lower Mn; the case-hardening equivalent. C16E (1.1148) and C20/C22 are also quoted.
- S235JRC / C22 — Near EN 10277 bright bar S235JRC (1.0122) is the general-purpose cold-drawn substitute; C22 (C 0.17–0.24) the closer chemistry.
- C15 — Near C 0.15–0.20, Mn 0.60–0.90; the US stock grade most often supplied against a C15 request.
1018 in GB/T (China)
- 20 — Near GB/T 699 grade 20 (20#): C 0.17–0.23, Mn 0.35–0.65 — slightly higher C, lower Mn.
1018 in GOST (Russia/CIS)
- 20 / 18kp — Near GOST 1050 Steel 20: C 0.17–0.24, Mn 0.35–0.65.
1018 in JIS (Japan)
- S15C / S17C / S20C — Near JIS G4051 S17C (C 0.15–0.20, Mn 0.30–0.60) is closest on carbon; S20C on strength.
1018 in ASTM / ASME
- A36 — Functional Structural plate/shape with guaranteed 250 MPa yield — the alternative for welded structures; 1018 is a bar product with no guaranteed properties.
Superseded names for 1018
- C1018 — AISI (pre-1960s prefix): C = basic open-hearth; still used in catalogues.
- G10180 — UNS
- 080A17 / 080M15 — BS 970
- C15 / C20 — EN 10084 / 10083: Bracketing European grades.
- St 37-3 K (bright bar) — DIN 1652 (withdrawn): German bright-bar equivalent, now EN 10277 S235JRC / C15.
Key data for 1018
Full composition, mechanical properties by thickness, heat treatment and applications for 1018 →
Verified against ASTM A29/A29M-20 (SAE J403 chemistry). Last checked: September 2026.