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01
EN10312 Welded stainless steel tubes for the conveyance of aqueous liquids including water for human consumption – Technical delivery conditions
Ordering Information
Orders must include:
- Quantity, dimensions (outer diameter, wall thickness, length)
- Steel grade (e.g., 1.4301, 1.4404)
- Surface finish (e.g., pickled, polished)
- Type of testing and inspection (e.g., hydrostatic, non-destructive testing)
- Any additional requirements (e.g., certification, special packaging)
Steel Grades & Chemical Composition
Common austenitic and austenitic-ferritic (duplex) grades include:
- 1.4301 (304)
- 1.4404 (316L)
- 1.4432 (316)
- 1.4539 (904L)
- 1.4462 (Duplex 2205)
Chemical composition must comply with EN 10088-1.
Mechanical Properties
- Tensile strength, yield strength, elongation per grade (e.g., 1.4404: ≥485 MPa tensile, ≥170 MPa yield).
- Hardness limits (e.g., ≤210 HV for austenitic grades).
Inspection & Testing Requirements
- Visual inspection (surface defects, weld integrity).
- Dimensional checks (diameter, wall thickness, ovality).
- Non-destructive testing (NDT) (eddy current, ultrasonic, or radiographic testing).
- Hydrostatic/pressure testing (optional, per customer request).
- Corrosion tests (if specified, e.g., intergranular corrosion test per EN ISO 3651-2).
Marking & Certification
- Tubes must be marked with:
- Manufacturer’s name/logo
- Steel grade
- Dimensions
- Standard number (EN 10312)
- Inspection Certificate 3.1 or 3.2 (EN 10204) may be required.
Packaging & Delivery
- Protection against mechanical damage and corrosion (e.g., plastic caps, waterproof wrapping).
Key Updates in Latest Version (2023)
- Revised corrosion resistance criteria.
- Enhanced NDT requirements for welded seams.
- Updated references to harmonized standards (e.g., EN 10088).
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