export@ezsteelpipe.com
+86 731 8870 6116
export@ezsteelpipe.com+86 731 8870 6116
export@ezsteelpipe.com+86 731 8870 6116
EN10312 Steel Pipe
EN 10312 specifies requirements for welded stainless steel tubes used in water supply systems, including drinking water, industrial water, and other aqueous liquids. It covers tubes for pressure and non-pressure applications.
description
EN10312 Welded stainless steel tubes for the conveyance of aqueous liquids including water for human consumption – Technical delivery conditions
1. Scope
EN 10312 specifies requirements for welded stainless steel tubes used in water supply systems, including drinking water, industrial water, and other aqueous liquids. It covers tubes for pressure and non-pressure applications.
2. 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)
3. 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.
4. 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).
5. 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).
6. 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.
7. 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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