EN 10216-2:2024 – Seamless Steel Tubes for Pressure Purposes – Technical Delivery Conditions – Part 2: Non-alloy and Alloy Steel Tubes with Specified Elevated Temperature Properties

This European standard specifies requirements for seamless steel tubes used in pressure equipment at elevated temperatures, covering non-alloy and alloy steels. The latest version (2024) includes updates to material grades, testing, and inspection procedures.  

Scope  

- Applies to seamless tubes for boilers, heat exchangers, and pressure vessels.  

- Covers non-alloy (P195GH, P235GH, etc.) and alloy steels (16Mo3, 13CrMo4-5, etc.).  

- Suitable for high-temperature service (creep-resistant steels).  

Ordering Information  

Purchasers must specify:  

- Quantity (length, number of tubes)  

- Material designation (e.g., P235GH, 13CrMo4-5)  

- Dimensions (outer diameter, wall thickness, length)  

- Delivery condition (e.g., normalized, tempered)  

- Testing requirements (e.g., impact testing, NDT)  

- Inspection documents (e.g., EN 10204 Type 3.1 or 3.2)  

- Special requirements (e.g., hydrogen compatibility, additional tests)  

 Material Grades & Chemical Composition  

 Non-Alloy Steels (for Elevated Temp Service)  

| Grade | C (max) | Mn | Si | P (max) | S (max) | Other |   

| P195GH | 0.13% | 0.40-1.20% | ≤0.40% | 0.025% | 0.015% | - |  

| P235GH | 0.16% | 0.60-1.20% | ≤0.35% | 0.025% | 0.015% | - |  

| P265GH | 0.20% | 0.80-1.40% | ≤0.40% | 0.025% | 0.015% | - |  

Alloy Steels (Cr-Mo & Heat-Resistant Grades)  

| Grade | C | Cr | Mo | Other |   

| 16Mo3 | 0.12-0.20% | - | 0.25-0.35% | - |  

| 13CrMo4-5 | 0.08-0.18% | 0.70-1.15% | 0.40-0.60% | - |  

| X10CrMoVNb9-1 (P91) | 0.08-0.12% | 8.0-9.5% | 0.85-1.05% | V, Nb |  

Mechanical Properties  

 Room Temperature Requirements  

| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |  

| P235GH | ≥235 | 360-510 | ≥25 |  

| 16Mo3 | ≥270 | 450-600 | ≥22 |  

| 13CrMo4-5 | ≥280 | 460-640 | ≥20 |  

Elevated Temperature Properties  

- Creep resistance data provided for long-term high-temp service.  

- Impact testing required for certain grades (e.g., -20°C or -50°C).  

Test Requirements  

 Mandatory Tests  

- Tensile test (per EN ISO 6892-1)  

- Hydrostatic test (or non-destructive testing (NDT) if agreed)  

- Flattening test / Bend test (for certain sizes)  

- Impact test (if specified, per EN ISO 148-1)  

Optional Tests (if required by purchaser)  

- Ultrasonic testing (UT) or eddy current testing (ET)  

- Grain size analysis  

- High-temperature tensile testing  

- Hardness testing  

Inspection & Certification  

- EN 10204 Type 3.1 (mandatory) – Manufacturer’s self-certification.  

- EN 10204 Type 3.2 (if required) – Independent inspection.  

- Traceability (heat number, manufacturing process).  

Marking & Surface Condition  

- Permanent marking: Grade, size, manufacturer, heat number, standard.  

- Surface finish: Free from defects affecting performance.  

Supplementary Requirements  

- S1: Special cleanliness (e.g., for hydrogen service).  

- S2: Additional NDT (e.g., full-body ultrasonic testing).  

- S3: Specific heat treatment conditions.  

Key Applications  

- Power plants (boiler tubes, super-heaters)  

- Oil & gas (pressure vessels, heat exchangers)  

- Chemical industry (high-temp piping)  

Major Steel Grades & Category

Non-Alloy Steel Grades (for Elevated Temperature Service)  

| Grade       | Similar to | Key Characteristics |  

| P195GH      | –             | Low-carbon, general-purpose |  

| P235GH      | ASTM A106 Gr.B | Standard boiler/pipe steel |  

| P265GH      | –             | Higher strength than P235GH |  

Alloy Steel Grades (Cr-Mo & Heat-Resistant Steels)  

Molybdenum (Mo) Steels  

| Grade       | Similar to ASTM | Alloy Composition |  

| 16Mo3       | A335 P1 / A209 T1a | 0.3% Mo (low-alloy) |  

| 20Mo4       | –                  | Higher Mo than 16Mo3 |  

Chromium-Molybdenum (Cr-Mo) Steels  

| Grade       | Similar to ASTM | Alloy Composition |  

| 13CrMo4-5   | A335 P12 / A213 T12 | 1% Cr-0.5% Mo |  

| 10CrMo5-5   | –                  | 1% Cr-0.5% Mo (variant) |  

| 10CrMo9-10  | A335 P22 / A213 T22 | 2.25% Cr-1% Mo |  

| X11CrMo5    | –                  | 5% Cr-0.5% Mo |  

| X11CrMo9-1  | A335 P9 / A213 T9  | 9% Cr-1% Mo |  

Advanced High-Temperature Steels (Cr-Mo-V-Nb)  

| Grade               | Similar to ASTM | Alloy Composition |  

| X10CrMoVNb9-1 (P91) | A335 P91 / A213 T91 | 9% Cr-1% Mo-V-Nb |  

| X11CrMoWVNb9-1-1    | A335 P92           | 9% Cr-2% W-1% Mo-V-Nb |  

| X11CrWMoVNb9-2-2    | –                  | 11% Cr-2% W-Mo-V-Nb |  

Stainless/Ferritic-Martensitic Steels  

| Grade       | Similar to ASTM | Alloy Composition |  

| X20Cr13     | –                  | 13% Cr (martensitic) |  

| X6CrNiNb18-10 | A213 TP347H      | 18% Cr-10% Ni-Nb (austenitic) |  

 Key Notes:  

1. Non-alloy grades (P195GH, P235GH, P265GH) are used for moderate temperatures (up to ~450°C).  

2. Cr-Mo grades (13CrMo4-5, 10CrMo9-10, etc.) are for high-temperature creep resistance (e.g., power plants).  

3. P91/P92 grades are for ultra-supercritical (USC) boilers (600°C+).  

4. Stainless grades (X6CrNiNb18-10) are included for corrosion-resistant high-temp applications.  

Comparison with ASTM Standards  

- EN 10216-2 X10CrMoVNb9-1 ≈ ASTM A335 P91  

- EN 10216-2 13CrMo4-5 ≈ ASTM A335 P12  

- EN 10216-2 10CrMo9-10 ≈ ASTM A335 P22  

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