Seamless Stainless Steel 253Ma Tube
Distinguished by the strategic addition of Rare Earth Metals (Cerium) and a high Silicon (Si) content, our 253MA tubing develops a tenacious, slow-growing oxide scale that ensures exceptional resistance to oxidation and isothermal scaling at temperatures up to 1150°C (2102°F). Compared to standard stainless steels, 253MA offers significantly higher creep-rupture strength, making it indispensable for mission-critical applications in boiler baffles, furnace components, and exhaust manifolds. Through advanced cold-drawing and specialized solution annealing, GZH ensures every tube maintains a uniform microstructure and high-integrity surface finish.
Seamless Stainless Steel 253MA Tube(UNS S30815 / W.Nr. 1.4835)
Seamless Stainless Steel 253MA Tube(UNS S30815 / W.Nr. 1.4835) is a high-performance heat-resistant stainless steel tube manufactured from a solid billet through hot extrusion and cold drawing processes without any welded joints. The seamless structure provides uniform metallurgical properties, excellent pressure resistance, and superior reliability in demanding industrial environments.
Compared with welded tubing, 253MA seamless tubes offer enhanced structural integrity, improved creep strength, and higher safety performance under elevated temperatures and mechanical stress. These characteristics make them particularly suitable for high-temperature industrial systems requiring long-term stability and oxidation resistance.
Material Overview of 253MA Stainless Steel
253MA stainless steel (designation: UNS S30815 / EN 1.4835) is a lean austenitic heat-resistant stainless steel developed specifically for high-temperature applications.
The alloy contains optimized additions of nitrogen, silicon, and the rare-earth element cerium, which significantly enhance oxidation resistance and creep-rupture strength. This unique alloy design enables the material to maintain structural stability and surface integrity in temperatures up to 1100 °C (2000 °F).
As a result, 253MA stainless steel tubes are widely used in furnace equipment, thermal processing systems, and high-temperature chemical environments.
Key Features and Advantages
Outstanding High-Temperature Oxidation Resistance
253MA stainless steel forms a stable and adherent oxide layer that protects the tube surface from oxidation and scaling in high-temperature atmospheres.
Superior Creep-Rupture Strength
Micro-alloying with nitrogen and rare-earth elements improves long-term creep resistance, making the material suitable for continuous high-temperature service.
Reliable Corrosion Resistance
253MA tubes perform effectively in moderately corrosive and high-temperature industrial environments, including oxidizing and carburizing atmospheres.
High Pressure and Temperature Capability
The seamless manufacturing process ensures excellent mechanical strength and allows safe operation under high internal pressure and elevated temperatures.
Good Weldability and Fabrication
253MA stainless steel can be welded using conventional welding processes without significant loss of corrosion resistance or mechanical properties.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Stainless Steel 253MA.
Table 1: Chemical Composition of Stainless Steel 253MA
The composition of Stainless Steel 253MA is carefully balanced to achieve its superior high-temperature oxidation resistance and creep strength.
| Cr | Ni | P | S | Ce | N | Mn | Si | C |
| 20.00 - 22.00 | 10.00 - 12.00 | ≤ 0.04 | ≤ 0.03 | 0.03 - 0.08 | 0.14 - 0.20 | ≤ 0.80 | 1.40 - 2.00 | 0.05 - 0.10 |
Table 2: Typical Mechanical Properties of Stainless Steel 253MA
Stainless Steel 253MA is specifically designed to maintain its strength and shape in high-temperature, high-stress environments.
| Property | Value (Annealed) |
| Tensile Strength | ≥ 600 MPa |
| Yield Strength | ≥ 300 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 200 HBW |
Table 3: Typical Physical Properties of Stainless Steel 253MA
These physical properties highlight the material's ability to perform reliably under a wide range of conditions.
| Property | Value |
| Density | 7.8 g/cm³ |
| Melting Point | 1400 - 1450 °C approx. |
| Thermal Expansion | 17.0 µm/m·°C (20-100°C) |
| Thermal Conductivity | 15.0 W/m·K (20°C) |
| Modulus of Elasticity | 195 GPa |
| Electrical Resistivity | 0.72 x 10⁻⁶ Ω·m (20°C) |
Table 4: The Standard of Stainless Steel Seamless Tube Size Tolerance Size Chart :
| Standard | OD(D) | Tolerance（MM) | Thickness(S) | Tolerance(MM) | Length | Tolerance | |
| MM | Common | High | MM | MM | |||
| EN 10216-5 HFD | 30≤D≤219.1（D2) | ±1.0% or ±0.5mm, whicever is the greater(取较大者) | T1, T≤4 | ±15% or ±0.6mm, whicever is the greater(取较大者) | L≤6M | +5/0 | |
| T2 | ±12.5% or ±0.4mm, whicever is the greater(取较大者) | ||||||
| 219.1≤D≤610 (D1) | ±1.5% or ±0.75mm, whicever is the greater (取较大者) | T≤0.05D | +22.5%/-15% | 6 | +10/0 | ||
| T1, 0.05D | ±15% or ±0.6mm, whicever is the greater(取较大者) | ||||||
| T2, T>0.09D | ±12.5% or ±0.4mm, whicever is the greater(取较大者) | L>12 | +by agreement/0 | ||||
| EN 10216-5 CFD | D3(D≤219.1) | ±0.75% or ±0.3mm, whicever is the greater(取较大者) | T3 | ±10% or ±0.2mm, whicever is the greater(取较大者) | |||
| D4(D≤219.1) | ±0.5% or ±0.mm, whicever is the greater(取较大者) | T4 | ±7.5% or ±0.15mm, whicever is the greater(取较大者) | ||||
| ASTM A213 HFD | D≤100 | +0.4/-0.8 | D<100,S≤2.4 | +40%/0 | HFD, all size | +5.0/0 | |
| +0.4/-1.2 | D<100,2.4 | +35%/0 | |||||
| +0.4/-1.6 | D<100,3.8 | +33%/0 | |||||
| D<100,S>4.6 | +28%/0 | ||||||
| 100 | +0.4/-1.2 | D>100, 2.4 | +35%/0 | ||||
| 200 | +0.4/-1.6 | D>100,3.8 | +33%/0 | ||||
| D>100,S>4.6 | +28%/0 | ||||||
| ASTM A213 CFD | D<25 | ±0.10 | D≤38.1 | +20%/0 | CFD, D<50.8 | +3.0/0 | |
| 25≤D≤40 | ±0.15 | ||||||
| 40 | ±0.20 | ||||||
| 50≤D<65 | ±0.25 | ||||||
| 65≤D<75 | ±0.30 | D>38.1 | +22%/0 | CFD, D≥50.8 | +5.0/0 | ||
| 75≤D≤100 | ±0.38 | ||||||
| 100 | +0.38/-0.64 | ||||||
| 200 | +0.38/-1.14 | ||||||
| ASTM A269 | D≤13 | ±0.13 | D≤13 | ±15% | D<38 | +3.2/0 | |
| 13 | ±0.13 | 13 | ±10% | ||||
| 38≤D<89 | ±0.25 | D>38 | +4.8/0 | ||||
| 89≤D<140 | ±0.38 | ||||||
| 140≤D<203 | ±0.76 | ||||||
| 203≤D<305 | ±1.01 | ||||||
| 305≤D<356 | ±1.26 | ||||||
| ASTM A270 | D<25 | ±0.13 | For weld pipe all size | ±12.5% | +3.0/0 | ||
| 25-50 | ±0.20 | ||||||
| 50-75 | ±0.25 | ||||||
| 75-100 | ±0.38 | For CD SMLS pipe D≤38.1 | +20%/0 | ||||
| 100-140 | ±0.38 | +5.0/0 | |||||
| 140-200 | ±0.75 | For CD SMLS pipe D>38.1 | +22%/0 | ||||
| 200-300 | ±1.25 | ||||||
Applications of Seamless Stainless Steel 253MA Tubes
Due to their excellent high-temperature performance, 253MA seamless tubes are widely used in industries requiring resistance to heat, oxidation, and thermal cycling.
Typical applications include:
- Industrial furnaces and heat-treatment equipment
- Radiant tubes and burner components
- Petrochemical and refining systems
- Power generation and boiler installations
- Kilns, incinerators, and high-temperature gas ducts
- Heat exchangers operating in elevated temperatures
Quality Assurance
All Seamless Stainless Steel 253MA Tubes are supplied with comprehensive quality documentation and inspection reports. Testing procedures may include:
- Chemical composition analysis
- Mechanical property testing
- Non-destructive testing (NDT)
- Dimensional inspection
Third-party inspection by internationally recognized agencies can be arranged upon request to ensure compliance with global quality standards.
