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253MA Stainless Steel Seamless Pipe ASTM A312 EN 1.4835

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253MA Stainless Steel Seamless Pipe ASTM A312 EN 1.4835

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Brand Name :DELTA
Model Number :253ma / S30815 / 1.4835
Certification :ISO
Place of Origin :China
MOQ :500 kgs
Price :5-10 USD/Kg
Payment Terms :L/C,T/T,Western Union
Supply Ability :3 Ton per week
Delivery Time :5 - 12 days based on the quantity
Packaging Details :standard packing for export
Products :Stainless Steel Seamless Pipe
Grade :253ma / S30815 / 1.4835
Diameter :DN10 - DN400
Length :6m or custom cutting any length as request
Standard :ASTM EN
Service :Cutting
Loading Port :Shanghai Port
Thickness :4.0 - 50.0mm
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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:

  1. Higher Silicon (Si) and Nitrogen (N): Significantly improve oxidation resistance and solid solution strengthening at high temperatures.

  2. 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.

253MA Stainless Steel Seamless Pipe ASTM A312 EN 1.4835253MA Stainless Steel Seamless Pipe ASTM A312 EN 1.4835253MA Stainless Steel Seamless Pipe ASTM A312 EN 1.4835253MA Stainless Steel Seamless Pipe ASTM A312 EN 1.4835

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