Open reference mapping Chinese GB cast aluminum (ZL, GB/T 1173) and magnesium (ZM, GB/T 1177) alloy grades to their nearest ASTM/AA, EN 1706/1753 and JIS equivalents — matched by chemical composition, not by name (the mistake most online tables make).
📄 Browsable table: see the GitHub Pages site for this repo · 📊 Machine-readable: alloy-grade-crossref.csv
Compiled and maintained by YIRUI Alloy — a magnesium & aluminum alloy casting manufacturer in Jiaozuo, China (since 2006). Full guide with composition notes: https://yiruialloy.com/chinese-gb-casting-alloy-western-equivalents/
Equivalents are the nearest grade by composition, not a guaranteed 1:1 substitution. Only two pairs are genuinely exact: ZM1 → ZK51A and ZM2 → ZE41A. The single binding document for any order is the GB/T material certificate. Confirm the spec for your application.
| GB grade | Key composition (wt %) | ASTM/AA (UNS) | EN 1706 | JIS | Match |
|---|---|---|---|---|---|
| ZL101 | Si 6.5–7.5 · Mg 0.25–0.45 | 356.0 / A356.0 | AC-42000/42100 | AC4C | close |
| ZL101A | Si 6.5–7.5 · Mg 0.25–0.45 · Ti 0.08–0.20 | A356.0 | AC-42100 | AC4CH | near-exact |
| ZL102 | Si 10–13 | 413.0 / A413.0 | AC-44000/44100 | AC3A | close |
| ZL104 | Si 8–10.5 · Mg 0.17–0.35 · Mn 0.2–0.5 | A360.0 | AC-43300 | AC4A | approx |
| ZL105 | Si 4.5–5.5 · Cu 1–1.5 · Mg 0.4–0.6 | 355.0 / C355 | AC-45300 | AC4D | close |
| ZL111 | Si 8–10 · Cu 1.3–1.8 · Mg 0.4–0.6 | 354.0 | — | — | close |
| ZL114A | Si 6.5–7.5 · Mg 0.45–0.75 · Ti | A357.0 | AC-42200 | AC4CH-mod | close |
| ZL201 | Cu 4.5–5.3 · Mn 0.6–1.0 · Ti | ~204.0 / 295.0 | AC-21100 | AC1B | approx |
| ZL205A | Cu 4.6–5.3 · Cd · V · Zr · B | none (nearest 206/A206) | none | none | China-proprietary |
| ZL301 | Mg 9.5–11.0 | 520.0 | ~AC-51300 | AC7B | close |
| GB grade | Key composition (wt %) | ASTM (UNS) | EN/ISO | Match |
|---|---|---|---|---|
| ZM1 | Zn 3.5–5.5 · Zr ≥0.5 | ZK51A (M16510) | MCMgZn6Zr | exact |
| ZM2 | Zn 3.5–5.0 · RE(Ce) 0.75–1.75 · Zr | ZE41A (M16410) = Elektron RZ5 | MC35110 | exact/near |
| ZM3 | RE(Ce) 2.5–4.0 · Zn 0.2–0.7 · Zr | EZ33A (M12330) | MC65120 | approx |
| ZM4 | RE 2.5–4.0 · Zn 2.0–3.0 · Zr | EZ33A | MC65120 | close |
| ZM5 | Al 7.5–9.0 · Zn 0.2–0.8 · Mn | AZ91C/E (M11914) | MCMgAl9Zn1 | close |
| ZM6 | Nd 2.0–3.0 · Zn 0.2–0.7 · Zr | EZ33A analog | MC65120 | approx |
| ZM7 | Zn 7.5–9.0 · Ag 0.6–1.2 · Zr | none (nearest ZK61A) | — | China-proprietary |
| ZM10 | Al 9.0–10.2 · Zn 0.6–1.2 · Mn | AZ91C/E; AZ92A | ~MCMgAl9Zn1 | close |
- ZL111 = 354.0, not AlSi8Cu3/AC-46200 (name-based tables get this wrong).
- ZL205A has no Western equivalent (Cd/V/Zr/B micro-alloyed, proprietary).
- ZM6 ≈ EZ33A-type (Nd, low Zn) — not ZE41A/RZ5 (Ce, high Zn — the opposite).
- ZM5 = AZ91C by convention; mean composition sits nearer AZ81A.
CC BY 4.0 — free to reuse with attribution to YIRUI Alloy (yiruialloy.com).
Found a better composition match or a GB/T 1177-2018 impurity-ceiling correction? Open an issue or PR with the authoritative source. Sources used: GB/T 1173 / 1177, ASTM B26/B108/B80/B403, EN 1706/1753, Total Materia, MatWeb, MakeItFrom.