EN 10217-7 X2CrNi18-9 Stainless Steel Tubes Welded Steel Tubes For Pressure Purposes
EN 10217-7 X2CrNi18-9, X2CrNi19-11, X2CrNiN18-10, X5CrNi18-10, X6CrNiTi18-10 Stainless Steel Tubes Welded Steel Tubes For Pressure Purposes
Material Specification
EN 10217-7 specifies the technical delivery conditions for welded steel tubes of circular cross-section, used for pressure purposes. The standard covers various grades of stainless steel, including X2CrNi18-9, X2CrNi19-11, X2CrNiN18-10, X5CrNi18-10, and X6CrNiTi18-10. These grades are known for their excellent corrosion resistance, high strength, and good weldability, making them suitable for a wide range of applications.
Key Features
- Corrosion Resistance: Excellent resistance to a wide range of corrosive environments.
- Strength: High tensile and yield strength.
- Weldability: Good weldability, suitable for various welding methods.
- Durability: Long-lasting performance in demanding conditions.
- Versatility: Suitable for various pressure applications.
Chemical Composition
| Grade | C (max) | Si (max) | Mn (max) | P (max) | S (max) | Cr | Ni | N (max) | Ti (max) |
|---|---|---|---|---|---|---|---|---|---|
| X2CrNi18-9 | 0.03 | 1.00 | 2.00 | 0.045 | 0.015 | 17.0-19.0 | 8.0-10.0 | 0.11 | - |
| X2CrNi19-11 | 0.03 | 1.00 | 2.00 | 0.045 | 0.015 | 18.0-20.0 | 10.0-12.0 | 0.11 | - |
| X2CrNiN18-10 | 0.03 | 1.00 | 2.00 | 0.045 | 0.015 | 17.0-19.0 | 8.0-10.0 | 0.10-0.16 | - |
| X5CrNi18-10 | 0.07 | 1.00 | 2.00 | 0.045 | 0.015 | 17.0-19.0 | 8.0-10.5 | - | - |
| X6CrNiTi18-10 | 0.08 | 1.00 | 2.00 | 0.045 | 0.015 | 17.0-19.0 | 10.0-12.0 | - | 5xC-0.70 |
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| X2CrNi18-9 | ≥ 200 | 500-700 | ≥ 40 | ≤ 215 |
| X2CrNi19-11 | ≥ 200 | 500-700 | ≥ 40 | ≤ 215 |
| X2CrNiN18-10 | ≥ 220 | 520-720 | ≥ 40 | ≤ 215 |
| X5CrNi18-10 | ≥ 190 | 500-700 | ≥ 40 | ≤ 215 |
| X6CrNiTi18-10 | ≥ 190 | 500-700 | ≥ 35 | ≤ 215 |
Steel Grade
The steel grades covered under EN 10217-7 include:
- X2CrNi18-9
- X2CrNi19-11
- X2CrNiN18-10
- X5CrNi18-10
- X6CrNiTi18-10
These grades are primarily austenitic stainless steels, known for their excellent mechanical properties and corrosion resistance.
Application
These stainless steel tubes are used in various pressure applications, including:
- Chemical and Petrochemical Industry: For transporting corrosive substances.
- Food and Beverage Industry: For hygienic and corrosion-resistant piping.
- Pharmaceutical Industry: For sterile and corrosion-resistant applications.
- Oil and Gas Industry: For high-pressure and corrosive environments.
- Power Generation: For boiler and heat exchanger tubes.
Possible Alternative Grades
Depending on the specific requirements, the following alternative grades may be considered:
- 304/304L: Commonly used austenitic stainless steel with similar properties.
- 316/316L: Offers better corrosion resistance, especially against chlorides.
- 321: Similar to 304 but with added titanium for improved resistance to intergranular corrosion.
- 347: Similar to 321 but with added niobium for stabilization.
These alternative grades can be selected based on the specific environmental conditions and mechanical requirements of the application.
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