Introduction
The ASTM A312 UNS S30815 253MA Stainless Steel Pipe is a high-performance austenitic stainless steel alloy known for its superior resistance to high-temperature oxidation, corrosion, and excellent mechanical properties in elevated temperature environments. 253MA is designed specifically for service in applications requiring high-temperature stability, especially in furnace and heat treatment industries. Its outstanding resistance to scaling, carburization, and general oxidation makes it a reliable material for extreme environments.
This grade of stainless steel is widely used in high-temperature industrial applications and is ideal for applications where both high strength and oxidation resistance are critical.
Standards and Specifications
The ASTM A312 UNS S30815 253MA Stainless Steel Pipe is manufactured according to the following standards:
- ASTM A312: Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
- UNS S30815: The Unified Numbering System for Materials identifies this as a high-alloy stainless steel grade.
- EN 10088-2: European Standard for Stainless Steel, covering requirements for this material’s composition, mechanical properties, and testing.
Chemical Composition (% by Weight)
The chemical composition of 253MA (UNS S30815) is designed to provide excellent resistance to oxidation and high-temperature strength. The typical composition is as follows:
|
Element |
Composition (%) |
| Chromium (Cr) | 20.00 - 23.00% |
| Nickel (Ni) | 24.00 - 26.00% |
| Silicon (Si) | 1.50 - 2.50% |
| Manganese (Mn) | 1.00 - 2.00% |
| Carbon (C) | ≤ 0.08% |
| Phosphorus (P) | ≤ 0.045% |
| Sulfur (S) | ≤ 0.030% |
| Nitrogen (N) | 0.10 - 0.30% |
| Iron (Fe) | Balance |
Material Properties: Key Characteristics
253MA (UNS S30815) combines excellent high-temperature strength with oxidation resistance. This makes it ideal for applications in extreme environments, such as furnaces and heat exchangers. The material has a high chromium and nickel content, providing excellent resistance to oxidation at temperatures up to 1150°C (2100°F).
Physical Properties
- Density: 7.8 g/cm³
- Melting Point: 1390°C (2540°F)
- Thermal Conductivity: 15.5 W/m·K at 100°C
- Specific Heat: 0.50 J/g·K at 100°C
- Electrical Resistivity: 0.73 μΩ·m at 20°C
- Tensile Strength: 570 MPa (minimum)
- Yield Strength: 240 MPa (minimum)
- Elongation: 40% (minimum)
- Hardness (Rockwell B): HRB 90 (maximum)
- Modulus of Elasticity: 200 GPa
- Poisson's Ratio: 0.30
- Excellent resistance to high-temperature oxidation, scaling, and carburization.
- Retains strength and form stability at temperatures exceeding 1000°C (1832°F).
- Superior resistance to acidic and alkaline environments.
- Resistant to sulfur and chloride-induced stress corrosion cracking.
- Can withstand aggressive environments, making it ideal for use in chemical processing and high-temperature industrial processes.
Mechanical Properties
Oxidation Resistance
Corrosion Resistance
Production Process: Craftsmanship for Precision
The manufacturing of 253MA Stainless Steel Pipes follows the latest production techniques to ensure high quality and durability:
- Seamless Pipe Manufacturing: Produced via extrusion, rotary piercing, and elongation processes to create seamless pipes with uniform wall thickness.
- Cold-Working Process: Cold drawing or pilgering processes are employed to achieve precise dimensions and smooth surfaces.
- Heat Treatment: Pipes undergo heat treatment at specific temperatures to enhance their mechanical properties and high-temperature performance.
- Pickling & Passivation: The pipes are pickled to remove scale and oxide films and passivated to ensure resistance to further corrosion.
Testing and Inspection: Quality Assurance
Womic Steel follows a strict testing protocol to ensure the highest quality for 253MA Stainless Steel Pipes:
- Chemical Composition Analysis: Verified using spectroscopic techniques to confirm that the alloy meets specified compositions.
- Mechanical Testing: Tensile, hardness, and impact testing to verify material performance at different temperatures.
- Hydrostatic Testing: Pipes are tested for pressure durability to ensure leak-free performance.
- Non-Destructive Testing (NDT): Includes ultrasonic, eddy current, and dye penetrant testing to detect any internal or surface defects.
- Visual & Dimensional Inspection: Each pipe is visually inspected for surface finish, and dimensional accuracy is checked against specifications.
For more information or a custom quote, contact Womic Steel today!
Email: sales@womicsteel.com
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Post time: Jan-08-2025