310S (also known as 1.4845 in EN standards and TP310S in ASTM standards) is a high-alloy austenitic stainless steel pipe tube renowned for its exceptional high-temperature resistance and corrosion resistance. It is widely used in industries requiring stability under extreme conditions. Below is a detailed introduction to its parameters, standards, specifications, similar grades, characteristics, and applications:
Key Parameters of 310S Stainless Steel Pipe
- Chemical Composition:
- Chromium (Cr): 24.00-26.00% (enhances oxidation and corrosion resistance)
- Nickel (Ni): 19.00-22.00% (stabilizes the austenitic structure and improves high-temperature performance)
- Carbon (C): ≤0.08% (low carbon content reduces carbide precipitation, enhancing weldability and intergranular corrosion resistance)
- Silicon (Si): ≤1.50%
- Manganese (Mn): ≤2.00%
- Phosphorus (P): ≤0.045%
- Sulfur (S): ≤0.030%
- Mechanical Properties:
- Tensile Strength: ≥520 MPa
- Yield Strength: ≥205 MPa
- Elongation: ≥40%
- Hardness: ≤201 HB
- Temperature Resistance: Can withstand continuous operating temperatures up to 1000°C and intermittent temperatures up to 1150°C, making it suitable for high-temperature environments.
Standards of 310S Stainless Steel Pipe
310S stainless steel pipes are manufactured in compliance with various international standards to ensure quality and compatibility:
- ASTM Standards: ASTM A312 (seamless and welded austenitic stainless steel pipes), ASTM A213 (seamless austenitic and ferritic alloy steel boiler, superheater, and heat exchanger tubes).
- EN Standards: EN 10216-5 (seamless steel tubes for pressure purposes - part 5: austenitic stainless steels).
- Other Standards: GB/T 14976 (Chinese standard for austenitic stainless steel seamless steel tubes for fluid transport).
Specifications of 310S Stainless Steel Pipe
The 310S stainless steel pipes are available in various diameters and wall thicknesses to meet diverse application needs. Common outer diameters (OD) include:
- 89mm, 114mm, 168mm, 219mm, 325mm (as mentioned in the title)
- Other common diameters: 12.7mm, 19mm, 25mm, 32mm, 57mm, 63mm, etc.
Wall thicknesses typically range from 1.2mm to 20mm, with options for both seamless and welded types. Lengths are usually 6 meters, but custom lengths can be provided based on requirements.
Equal Grade of 310S Stainless Steel
310S has equivalent or similar grades in different standard systems, including:
- ASTM: TP310S
- EN: 1.4845
- JIS: SUS310S
- GB: 06Cr25Ni20
These grades share similar chemical compositions and performance characteristics, ensuring interchangeability in many applications.
Characteristicsof 310S Stainless Steel Pipe
- Excellent High-Temperature Resistance: Maintains structural stability and mechanical properties at high temperatures, resisting oxidation and scaling even in prolonged exposure to high-heat environments.
- Superior Corrosion Resistance: Resists corrosion from oxidizing media (such as nitric acid), organic acids, and industrial atmospheres. It also performs well in moderately reducing environments.
- Good Weldability: Low carbon content minimizes carbide precipitation during welding, reducing the risk of intergranular corrosion. Suitable for various welding methods like TIG and MIG.
- High Ductility and Formability: Easy to fabricate, bend, and shape, making it adaptable to complex structural designs.
Applications of 310S Stainless Steel Pipe
Due to its unique properties, 310S stainless steel pipes are widely used in the following industries:
- Thermal Power Plants: Boiler tubes, superheater tubes, and heat exchanger tubes.
- Chemical Industry: Piping for high-temperature reaction vessels, distillation columns, and pipelines transporting corrosive fluids.
- Metallurgical Industry: Furnace components, annealing furnaces, and heat treatment equipment.
- Environmental Protection: Incinerators, flue gas desulfurization systems, and waste treatment facilities.
- Aerospace and Automotive: Exhaust systems and high-temperature structural parts.
