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0102030405
Welded Stainless Steel Tubes for Water Supply - China Suppliers & Factory for Aqueous Liquids
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)
ℹ️ 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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Frequently Asked Questions (FAQ)
Q
What information is required when placing an order for EN 10312 welded stainless steel tubes?
When ordering, you must provide the quantity, dimensions (outer diameter, wall thickness, length), steel grade (e.g., 1.4301 or 1.4404), desired surface finish, type of testing and inspection required, and any additional requirements such as certifications or special packaging.
Q
Which steel grades are available for EN 10312 welded stainless steel tubes?
Common available grades include 1.4301 (304), 1.4404 (316L), 1.4432 (316), 1.4539 (904L), and 1.4462 (Duplex 2205). All chemical compositions must comply with EN 10088-1.
Q
What are the mechanical property requirements for grade 1.4404 (316L)?
For grade 1.4404 (316L), the minimum tensile strength is ≥485 MPa and the minimum yield strength is ≥170 MPa. Hardness for austenitic grades must not exceed ≤210 HV.
Q
What types of non-destructive testing (NDT) are used for these tubes?
Non-destructive testing methods include eddy current testing, ultrasonic testing, and radiographic testing. These are used to verify weld seam integrity and detect any internal or surface defects without damaging the product.
Q
What certifications and markings are required for EN 10312 tubes?
Each tube must be marked with the manufacturer's name or logo, steel grade, dimensions, and the standard number (EN 10312). An Inspection Certificate 3.1 or 3.2 in accordance with EN 10204 may also be required depending on the customer's specification.
Q
What are the key updates introduced in the 2023 version of EN 10312?
The 2023 revision introduced revised corrosion resistance criteria, enhanced NDT requirements specifically for welded seams, and updated references to harmonized standards including EN 10088, ensuring better alignment with current industry practices.