1. What Do ASTM and EN Stand For?
|
Abbreviation
|
Full Name
|
|
ASTM
|
American Society for Testing and Materials
|
| EN |
European Norm
|
In simple terms: ASTM is a technical standard developed by a respected US private organization. EN is a mandatory standard uniformly implemented by EU member countries.
Both are the most widely used standard systems in global stainless steel pipe trade.
2.Quick Comparison Table
|
Aspect
|
ASTM (US Standard) |
EN (European Standard) |
|
Typical Standard
|
ASTM A312 (seamless/welded) |
EN 10217-7 (welded) / EN 10216-5 (seamless) |
|
Common Grades
|
TP304, TP316, TP316L |
1.4301, 1.4401, 1.4404 |
| Dimension Unit |
Inch |
Millimeter (mm)
|
| Wall Thickness |
Schedule (Sch 10S, 40S, 80S) |
Series 1, Series 2, or direct mm
|
| Tolerance |
Broader, more practical |
Tighter, more precise
|
3.Three Key Differences
3.1 Grade : Alphanumeric vs Numeric Code
ASTM uses easy-to-remember combinations like 304 or 316L. EN uses a 5-digit numeric system: 1.4301, 1.4404. European engineers recognize these instantly.
3.2 Dimension System: Inch vs Metric
ASTM pipe OD is in inches (1/2″, 1″, 2″).
EN pipe OD is in mm (21.3mm, 33.7mm, 60.3mm).
3.3 Inspection Requirements: EN is Generally Stricter
EN standards demand tighter control on chemical composition, mechanical properties, and traceability per heat number. ASTM offers more flexibility.
As a professional stainless steel welded tubes manufacturer, MW Metal can supply both ASTM and EN tubes as your requirements.
Interested in our product catalog and our price level? Please feel free to contact Vivian in [email protected] at any time.
