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0102030405
High-Temperature Austenitic Seamless Steel Tubes for Pressure Applications - China Suppliers & Factory
Ordering Information
Purchasers must specify:
- Quantity (length, number of tubes)
- Dimensions (outer diameter, wall thickness)
- Steel grade (e.g., 1.4301, 1.4404)
- Delivery condition (e.g., solution annealed)
- Inspection requirements (e.g., non-destructive testing, hydrostatic pressure)
- Any special requirements (e.g., specific cleanliness for nuclear applications)
Steel Grades & Chemical Composition
The standard covers austenitic stainless steels, including:
- Standard grades: 1.4301 (304), 1.4404 (316L), 1.4541 (321), 1.4571 (316Ti), etc.
- High-temperature grades: 1.4919, 1.4958, etc.
- Composition limits for C, Si, Mn, P, S, Cr, Ni, Mo, N, etc., are specified.
Manufacturing & Delivery Conditions
- Production method: Seamless, cold/hot finished.
- Heat treatment: Solution annealing (mandatory for austenitic steels).
- Surface finish: Free from scale, cracks, and defects; pickling or passivation may be required.
Inspection & Testing Requirements
1 Mechanical Properties
- Tensile test (Rm, Rp0.2, elongation)
- Hardness test (if required)
2 Non-Destructive Testing (NDT)
- Eddy current or ultrasonic testing for defect detection.
- Hydrostatic testing (optional, unless specified).
3 Other Tests
- Grain size assessment (for certain grades)
- Intergranular corrosion test (e.g., Strauss test for sensitization).
Marking & Certification
Tubes must be marked with:
- Manufacturer's name/logo
- Steel grade
- Dimensions
- Heat number
- Standard reference (EN 10216-5)
- Inspection Certificate 3.1 or 3.2 (EN 10204).
Tolerance & Dimensions
- Covers tolerances for outer diameter, wall thickness, straightness, and length.
Austenitic Stainless Steels
| Material Number | EN Designation | Common Name (AISI/UNS) |
|---|---|---|
| 1.4301 | X5CrNi18-10 | 304 (UNS S30400) |
| 1.4306 | X2CrNi19-11 | 304L (UNS S30403) |
| 1.4307 | X2CrNi18-9 | 304L (low carbon) |
| 1.4311 | X2CrNiN18-10 | 304LN (UNS S30453) |
| 1.4541 | X6CrNiTi18-10 | 321 (UNS S32100) |
| 1.4550 | X6CrNiNb18-10 | 347 (UNS S34700) |
| 1.4401 | X5CrNiMo17-12-2 | 316 (UNS S31600) |
| 1.4404 | X2CrNiMo17-12-2 | 316L (UNS S31603) |
| 1.4435 | X2CrNiMo18-14-3 | 316L (higher Mo) |
| 1.4436 | X3CrNiMo17-13-3 | 316 (modified) |
| 1.4571 | X6CrNiMoTi17-12-2 | 316Ti (UNS S31635) |
| 1.4429 | X2CrNiMoN17-13-3 | 316LN (UNS S31653) |
| 1.4539 | X1NiCrMoCu25-20-5 | 904L (UNS N08904) |
| 1.4547 | X1CrNiMoCuN20-18-7 | Superaustenitic (UNS S31254) |
Austenitic-Ferritic (Duplex) Stainless Steels
| Material Number | EN Designation | Common Name (AISI/UNS) |
|---|---|---|
| 1.4462 | X2CrNiMoN22-5-3 | 2205 (UNS S31803/S32205) |
| 1.4410 | X2CrNiMoN25-7-4 | Super Duplex (UNS S32750) |
Special High-Temperature Grades
| Material Number | EN Designation | Notes |
|---|---|---|
| 1.4958 | X6NiCrNb32-27 | Alloy 800H (UNS N08810) |
| 1.4959 | X8NiCrAlTi32-21 | Alloy 800HT (UNS N08811) |
| 1.4878 | X12CrNiTi18-10 | High-temperature 321 variant |
📌 Notes on Steel Grades
- Grades like 1.4301 (304) and 1.4404 (316L) are the most commonly used.
- Duplex steels (1.4462, 1.4410) offer higher strength and corrosion resistance.
- High-temperature grades (1.4958, 1.4959) are used in extreme conditions (e.g., petrochemical furnaces).
- Low-carbon variants (e.g., 1.4306, 1.4404) are preferred for welding applications.
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Frequently Asked Questions
Q What is EN 10216-5 and what does it cover?
EN 10216-5 is a European standard that specifies technical delivery conditions for seamless stainless steel tubes used for pressure purposes, including requirements for dimensions, tolerances, chemical composition, mechanical properties, inspection, and certification.
Q Which steel grades are covered under EN 10216-5?
The standard covers a wide range of austenitic stainless steels (e.g., 1.4301/304, 1.4404/316L), duplex grades (e.g., 1.4462/2205), and special high-temperature grades (e.g., 1.4958 Alloy 800H), suitable for various industrial applications.
Q What information is required when placing an order for EN 10216-5 tubes?
Purchasers must specify quantity, dimensions (outer diameter and wall thickness), steel grade, delivery condition (e.g., solution annealed), inspection requirements, and any special requirements such as cleanliness standards for nuclear applications.
Q What types of non-destructive testing (NDT) are applicable under EN 10216-5?
EN 10216-5 allows for eddy current testing and ultrasonic testing for defect detection. Hydrostatic testing may also be performed if specified by the purchaser.
Q What inspection certificate is required for EN 10216-5 tubes?
Tubes supplied under EN 10216-5 typically require an Inspection Certificate 3.1 or 3.2 as defined by EN 10204, confirming that the material meets all specified requirements.
Q Why are low-carbon grades like 1.4404 (316L) preferred for welding applications?
Low-carbon variants such as 1.4404 (316L) and 1.4306 (304L) have reduced carbon content, which minimizes the risk of sensitization and intergranular corrosion in the heat-affected zone during welding, making them ideal for welded assemblies in corrosive environments.