EN10216-5 Seamless Steel Tubes for Pressure Purposes at Elevated Temperatures - Technical Delivery Conditions

Part 5: Stainless Steel Tubes

1. Scope  

- Covers seamless tubes made of austenitic stainless steels for high-temperature service.  

- Tubes are intended for pressure equipment (e.g., boilers, heat exchangers, pipelines).  

2. 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).  

3. 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.  

4. 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.  

5. Inspection & Testing Requirements  

5.1 Mechanical Properties  

- Tensile test (Rm, Rp0.2, elongation)  

- Hardness test (if required)  

5.2 Non-Destructive Testing (NDT)  

- Eddy current or ultrasonic testing for defect detection.  

- Hydrostatic testing (optional, unless specified).  

5.3 Other Tests  

- Grain size assessment (for certain grades)  

- Intergranular corrosion test (e.g., Strauss test for sensitization).  

6. 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).  

7. Tolerance & Dimensions  

- Covers tolerances for outer diameter, wall thickness, straightness, and length.  

List of Steel Grades in EN 10216-5

l 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)  

l  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)  

l 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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