Navigating International Pipe Standards
Steel pipes are manufactured to different standards depending on industry, region, and application. The three major systems are API, ASTM, and EN. Understanding relationships between them is essential for international procurement.
Overview
API (American Petroleum Institute)
- API 5L – Line pipe for oil/gas transmission
- API 5CT – Casing and tubing
ASTM (American Society for Testing and Materials)
- ASTM A53 – General purpose pipe
- ASTM A106 – High-temperature seamless pipe
- ASTM A312 – Stainless steel pipe
- ASTM A500 – Structural tubing
EN (European Norm)
- EN 10216 – Seamless pressure tubes
- EN 10217 – Welded pressure tubes
- EN 10219 – Cold-formed structural hollow sections
Carbon Steel Cross-Reference
| API 5L | ASTM | EN | Yield (MPa) |
|---|---|---|---|
| Grade B | A53 B, A106 B | EN 10216-1 P235GH | 245 |
| X42 | A106 (special) | P265GH | 290 |
| X52 | — | P355GH | 360 |
| X60 | — | L415 | 415 |
| X65 | — | L450 | 450 |
| X70 | — | L485 | 485 |
Stainless Steel Cross-Reference
| ASTM | EN Equivalent | Application |
|---|---|---|
| A312 TP304 | EN 10217-7 X5CrNi18-10 | General corrosion-resistant |
| A312 TP316L | X2CrNiMo17-12-2 | Chemical, marine |
| A790 2205 | Duplex (EN) | Offshore, desalination |
| A335 P11 | 13CrMo4-5 | High-temp (power plants) |
Key Differences
- Testing: API requires more NDT than general ASTM
- Tolerances: EN typically tighter than ASTM
- Certification: API requires separate mill certification
- Impact testing: EN requires Charpy at specified temperatures
Need Steel Products for Your Project?
CoreMetal Steel (Xi’an Coremetal Steel Co., Ltd.) is a professional steel and metal materials supplier based in Xi’an, China. We export to 60+ countries with ISO 9001 certification. Contact us today for competitive pricing and technical support.
Contact: Tracy | Email: tracy@coremetalsteel.com | Phone: +86 18291910632