金屬與合金統一數字編號系統（英語：Unified Numbering System for Metals and Alloys），通常稱「美國UNS編號」，於北美地區廣泛為人所接受，編號是由一個英文字母加上五個數字所組成。
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- UNS K11547 相應為 T2 工具鋼（T2 tool steel）
- UNS S17400 相應為 ASTM 630級（ASTM grade 630，Cr-Ni 17-4PH precipitation hardened stainless steel）
- UNS S30400 相應為 SAE 304, Cr/Ni 18/10, Euronorm 1.4301 stainless steel
- UNS S31600 相應為 SAE 316
- UNS S31603 相應為 316L（316的低碳含量分型）。最後兩位數字"03"標示其材料所含最高碳含量為 0.03%
- UNS C90300 相應為 CDA 903
| UNS編碼 | 金屬類型 |
|---|---|
| A00001 to A99999 | 鋁、鋁合金 |
| C00001 to C99999 | 銅、銅合金(黃銅、青銅) |
| D00001 to D99999 | 特定強度要求的鋼(Specified mechanical property steels) |
| E00001 to E99999 | 稀有土金屬及合金(Rare earth and rare earthlike metals and alloys) |
| F00001 to F99999 | 鑄鐵 |
| G00001 to G99999 | AISI標準與SAE標準的碳鋼及合金鋼(除了工具鋼之外) |
| H00001 to H99999 | AISI標準與SAE標準的H鋼(H-steels) |
| J00001 to J99999 | 鑄鋼(除了工具鋼之外) |
| K00001 to K99999 | 各式各樣的鐵合金(Miscellaneous steels and ferrous alloys) |
| L00001 to L99999 | 低熔點的金屬及合金 |
| M00001 to M99999 | 各式各樣的非鐵金屬及合金
M1xxxx - 鎂合金(Mg) |
| N00001 to N99999 | 鎳、鎳合金 |
| P00001 to P99999 | 貴金屬、貴金屬合金 |
| R00001 to R99999 | 難熔金屬(Reactive and refractory metals and alloys)
R03xxx- 鉬合金(Mo) R04xxx- 鈮合金(Nb，舊稱鈳) R05xxx- 鉭合金(Ta) R3xxxx- 鈷合金(Co) R5xxxx- 鈦合金(Ti) R6xxxx- 鋯合金(Zr) |
| S00001 to S99999 | 耐熱鋼、不鏽鋼 |
| T00001 to T99999 | 工具鋼、熟鐵 |
| W00001 to W99999 | 焊接金屬Welding filler metals |
| Z00001 to Z99999 | 鋅、鋅合金 |
中國的ISC（統一數字代號）設計和UNS類似，[2]但編碼表不互通。一個材料可能UNS/ISC相同（如S31603），可能稍有不同（S30400/S30408、S17400/S17440），也可能完全不一樣（S20200/S35450、S41026[3]/S45710）。[1]
- Stainless steel grades listed in the international standard ISO 15510:2010 Comparative designations of grades with similar composition from other important standards. (listed by type of steel structure and by increasing intermediate 3-digits code of the ISO name) (PDF). International Stainless Steel Forum. [10 March 2023]. （原始內容存檔 (PDF)於2023-05-10）.
- GB/T 17616-2013 钢铁及合金牌号统一数字代号体系. openstd.samr.gov.cn.
- ASTM A182/A182M − 12a: Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
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