Here’s a comprehensive overview of the key international standards for alloy pipes, categorized by application, material, and region:
1. General Alloy Pipe Standards
| Standard | Scope | Common Alloys Covered |
|---|---|---|
| ASTM A335 | Seamless ferritic alloy-steel pipes for high-temperature service | P5, P9, P11, P22, P91, P92 |
| ASTM A213 | Seamless ferritic/austenitic alloy-steel boiler, superheater, and heat-exchanger tubes | T5, T9, T11, T22, T91, 304H, 316H |
| ASTM A312 | Seamless/welded austenitic stainless steel pipes | 304/304L, 316/316L, 321, 347 |
| ASME SA335 | Equivalent to ASTM A335 (adopted by ASME Boiler & Pressure Vessel Code) | Same as ASTM A335 |
| EN 10216-2 | Seamless steel tubes for pressure purposes (European standard) | P195GH, P265GH, P355GH, 13CrMo4-5 |
2. Oil & Gas Industry Standards
| Standard | Application | Key Alloys |
|---|---|---|
| API 5L | Line pipe for transportation of oil/gas (covers carbon/alloy steels) | X42, X52, X60, X65, X70 (with Cr-Mo grades) |
| API 5CT | Casing and tubing for wells (includes corrosion-resistant alloys) | L80, C90, T95, 13Cr, Super Duplex |
| NACE MR0175/ISO 15156 | Materials for H₂S (sour service) environments | Duplex 2205, Inconel 625, Alloy 825 |
3. High-Temperature/Pressure Alloy Standards
| Standard | Use Case | Typical Alloys |
|---|---|---|
| ASTM A691 | High-strength Cr-Mo alloy steel pipes for elevated temps/pressures | 1¼Cr-½Mo, 2¼Cr-1Mo |
| ASTM A358 | Electric-fusion-welded austenitic alloy pipes for high-temp service | 304H, 316H, 321H |
| EN 10222-2 | Steel forgings for pressure purposes (European) | 11CrMo9-10, X10CrMoVNb9-1 (P91) |
4. Corrosion-Resistant Alloy (CRA) Standards
| Standard | Focus | Alloys Included |
|---|---|---|
| ASTM B444 | Nickel-chromium-molybdenum (Inconel) pipes | Inconel 625, 718 |
| ASTM B423 | Nickel-iron-chromium (Incoloy) pipes | Incoloy 800H, 825 |
| ASTM B622 | Seamless nickel/alloy pipes for corrosive environments | Hastelloy C276, C22 |
