8620 equivalent grades: ASTM, EN, JIS, GB, DIN
8620 is nickel-chromium-molybdenum case-hardening steel specified in ASTM A29. Below, the grades that can replace it — 6 standard systems in all — with the deciding limit named for each one rather than left to be looked up. The full 8620 data sheet carries the composition and mechanical tables.
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8620 is cross-certified with 805M20 (EN362), 20NiCrMo2-2, 20CrNiMo and 1 more: the composition windows overlap closely enough that one certificate satisfies the other. 8615 / 8617 / 8622, 20KhGNM / 20KhN2M differ on one limit only — a carbon ceiling, an impact temperature or a strength minimum. 4320 / 18CrNiMo7-6, 1018 / C15, 16MnCr5 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 Across systems that is 1 in BS (superseded British), 2 in EN (European), 1 in GB/T (China), 1 in JIS (Japan), 3 in AISI / SAE, 1 in GOST (Russia/CIS).
Cross-reference table
| Grade | System | Match | Why / differences |
|---|---|---|---|
| 805M20 (EN362) | BS (superseded British) | Identical | BS 970 805M20: C 0.17–0.23, Ni 0.35–0.75, Cr 0.35–0.65, Mo 0.15–0.25. |
| 20NiCrMo2-2 | EN (European) | Identical | 1.6523 (EN 10084; formerly 21NiCrMo2): C 0.17–0.23, Ni 0.40–0.70, Cr 0.35–0.70, Mo 0.15–0.25. |
| 20CrNiMo | GB/T (China) | Identical | GB/T 3077 20CrNiMo: C 0.17–0.23, Ni 0.35–0.75, Cr 0.40–0.70, Mo 0.20–0.30. |
| SNCM220 | JIS (Japan) | Identical | JIS G4053 SNCM220: C 0.17–0.23, Ni 0.40–0.70, Cr 0.40–0.65, Mo 0.15–0.30. |
| 8615 / 8617 / 8622 | AISI / SAE | Near | Carbon steps of the 86xx family (0.15, 0.17, 0.22 % C) for lighter or heavier cores. |
| 20KhGNM / 20KhN2M | GOST (Russia/CIS) | Near | GOST 4543 20KhGNM (C 0.18–0.23, Ni 0.40–0.70, Cr 0.40–0.70, Mo 0.15–0.25) is the closest Russian match. |
| 4320 / 18CrNiMo7-6 | AISI / SAE | Functional | Higher-Ni grades (1.8 / 1.5 % Ni) for larger, more heavily loaded gears. |
| 1018 / C15 | AISI / SAE | Functional | Unalloyed case-hardening steels for small, lightly loaded parts. |
| 16MnCr5 | EN (European) | Functional | European Mn-Cr case-hardening steel with similar hardenability, no Ni — the usual EU substitute in gear practice. |
Identical, near and functional are defined once on the grade index; the reason column below says which limit differs in each case.
8620 in BS (superseded British)
- 805M20 (EN362) — Identical BS 970 805M20: C 0.17–0.23, Ni 0.35–0.75, Cr 0.35–0.65, Mo 0.15–0.25.
8620 in EN (European)
- 20NiCrMo2-2 — Identical 1.6523 (EN 10084; formerly 21NiCrMo2): C 0.17–0.23, Ni 0.40–0.70, Cr 0.35–0.70, Mo 0.15–0.25.
- 16MnCr5 — Functional European Mn-Cr case-hardening steel with similar hardenability, no Ni — the usual EU substitute in gear practice.
8620 in GB/T (China)
- 20CrNiMo — Identical GB/T 3077 20CrNiMo: C 0.17–0.23, Ni 0.35–0.75, Cr 0.40–0.70, Mo 0.20–0.30.
8620 in JIS (Japan)
- SNCM220 — Identical JIS G4053 SNCM220: C 0.17–0.23, Ni 0.40–0.70, Cr 0.40–0.65, Mo 0.15–0.30.
8620 in AISI / SAE
- 8615 / 8617 / 8622 — Near Carbon steps of the 86xx family (0.15, 0.17, 0.22 % C) for lighter or heavier cores.
- 4320 / 18CrNiMo7-6 — Functional Higher-Ni grades (1.8 / 1.5 % Ni) for larger, more heavily loaded gears.
- 1018 / C15 — Functional Unalloyed case-hardening steels for small, lightly loaded parts.
8620 in GOST (Russia/CIS)
- 20KhGNM / 20KhN2M — Near GOST 4543 20KhGNM (C 0.18–0.23, Ni 0.40–0.70, Cr 0.40–0.70, Mo 0.15–0.25) is the closest Russian match.
Superseded names for 8620
- G86200 / H86200 — UNS: 8620H = hardenability-guaranteed version, standard for gears.
- 21NiCrMo2 / 20NiCrMo2-2 / 1.6523 — EN 10084 / DIN 17210: European twin.
- 805M20 / 805A20 / EN362 — BS 970: EN362 still used in the UK/India.
- SNCM220 — JIS G4053: Formerly SNCM21.
- 20CrNiMo — GB/T 3077: Chinese twin.
Key data for 8620
Full composition, mechanical properties by thickness, heat treatment and applications for 8620 →
Verified against ASTM A29/A29M-20 (SAE J404 chemistry). Last checked: September 2026.