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EN 1.4835 / Alloy 253ma Stainless Steel Pipe Tube SS Pipe ASTM A312 Staight Pipe U Pipes
Products Specification
Products Name | 253ma Stainless Steel Seamless Pipe |
Grade: | 304 304L 309S 310S 314 316L 316Ti 321 329 347H 410 2205 2507 S32760 904L 254SMO and equal grade in GB JIS EN DIN Standard |
Standards: | ASTM A213M-94b ASTM A249M-94a ASTM A269-94a ASTM A312M-94b,ect. |
DIN 17456-85 DIN 17458-85 DIN 17459-92.ect | |
JIS G3446-1994 JIS G3448-1997 JIS G3459-1997 JIS G3463-1994,ect. | |
GB13296-1991 GB14975-2002 GB14976-2002,ect. | |
Size: | ND5 - DN400 |
Length: | 6m length or cutting any length as request |
Applications: | fluid and gas transport, structure , boiler, heat exchanger, super heater |
253MA Stainless Steel: A High-Temperature Austenitic Alloy
253MA (UNS S30815) is a specialized austenitic, heat-resistant stainless steel developed by Outokumpu (originally by Avesta Sheffield). Its key characteristic is exceptional high-temperature strength and oxidation resistance, particularly in the range of 850°C to 1100°C (1562°F to 2012°F). This makes it ideal for demanding applications where standard grades like 304H or 309S reach their limits.
The "MA" stands for "Micro-alloyed". Its enhanced properties come from a carefully balanced chemical composition featuring:
Higher Silicon (Si) and Nitrogen (N): Significantly improve oxidation resistance and solid solution strengthening at high temperatures.
Rare Earth Addition (Cerium - Ce): This is the key innovation. Cerium promotes the formation of a dense, tightly adherent chromium oxide (Cr₂O₃) scale, dramatically improving resistance to cyclic oxidation (scaling/spalling), carburization, and sulfidation in aggressive atmospheres.
Key Advantages:
Superior Creep & Rupture Strength: Outperforms standard austenitics like 304H and 309S significantly above 850°C.
Excellent Oxidation Resistance: Especially resistance to spalling during thermal cycling due to the Ce addition.
Good Resistance to Carburization & Sulfidation: Suitable for petrochemical and chemical processing environments.
Good Fabricability: Can be formed, welded, and machined using standard methods for austenitic stainless steels (though higher strength requires more force).
Primary Applications:
High-temperature furnace components (radiant tubes, muffles, retorts, conveyor belts, fan blades)
Heat exchangers for aggressive flue gases
Petrochemical cracking tubes, reformers
Thermal oxidizers
Cement & lime kiln components
Power generation components (heat recovery boilers)
Glass manufacturing equipment
Chemical Composition (Typical Weight %, ASTM A240 / EN 1.4835):
Element | Min (%) | Max (%) | Key Role |
---|---|---|---|
Carbon (C) | 0.05 | 0.10 | Strength, carbide formation |
Chromium (Cr) | 20.0 | 22.0 | Oxidation/corrosion resistance |
Nickel (Ni) | 10.0 | 12.0 | Austenite stability, ductility |
Silicon (Si) | 1.4 | 2.0 | Oxidation resistance |
Nitrogen (N) | 0.14 | 0.20 | Solid solution strengthening |
Cerium (Ce) | 0.03 | 0.08 | Adherent oxide scale formation |
Manganese (Mn) | 0.80 | - | Austenite stability, deoxidation |
Phosphorus (P) | - | 0.040 | Impurity control |
Sulfur (S) | - | 0.030 | Impurity control |
Iron (Fe) | Balance | Base Metal |
Typical Mechanical Properties (Room Temperature):
Property | Value | Condition |
---|---|---|
Tensile Strength (Rm) | 650 - 850 MPa (94 - 123 ksi) | Solution Annealed |
Yield Strength (Rp0.2) | 350 - 450 MPa (51 - 65 ksi) | Solution Annealed |
Elongation (A5) | ≥ 40% | Solution Annealed |
Hardness (HBW) | ≤ 290 | Solution Annealed |
High-Temperature Strength Comparison (Creep Rupture Strength):
Temperature (°C / °F) | Stress for 10^5 h Rupture (MPa / ksi) |
---|---|
600°C / 1112°F | ~120 MPa / 17 ksi |
700°C / 1292°F | ~75 MPa / 11 ksi |
800°C / 1472°F | ~45 MPa / 6.5 ksi |
900°C / 1652°F | ~25 MPa / 3.6 ksi |
1000°C / 1832°F | ~12 MPa / 1.7 ksi |
*(Note: Values are indicative; 253MA significantly outperforms 304H/309S, especially above 800°C.)*
Important Considerations:
Optimum Oxidation Limit: ~1150°C (2100°F) in continuous service. Resistance drops significantly above this.
Not for Pressure Vessels: Generally not ASME Boiler & Pressure Vessel Code approved due to long-term microstructural stability concerns at high stress/temperature.
Weldability: Good. Use matching filler metals (e.g., Sandvik 22.12.HLS, Haynes Weld Wire 253MA™) and standard austenitic procedures. Low heat input is beneficial.
Machining: Higher strength and work hardening rate compared to 304/316 require more power, rigid setups, positive cutting geometries, and good coolant/lubrication.
In summary, 253MA is a micro-alloyed austenitic stainless steel engineered for superior high-temperature strength and oxidation resistance, particularly under cyclic conditions. Its unique combination of high Si, N, and Ce makes it a critical material for extreme thermal environments beyond the capabilities of common heat-resistant grades.