What Is a Seamless Stainless Steel 253Ma Tube?
253MA UNS S30815 Seamless Stainless Steel Tube is supplied for rare-earth-enhanced oxidation resistance and creep strength at high temperature. The size range shown (OD 6–257 mm; WT 0.5–35 mm) is the overall capability across this product family, not a per-grade commitment. Confirm the specific OD × WT × length combination for the ordered grade in the quotation. The governing specification must be stated on the purchase order: ASTM A213 / ASME SA213, UNS S30815. Chemistry, mechanical properties, heat treatment, dimensional tolerance, NDT and certification must be reported against the ordered standard and material heat; do not treat typical values as guaranteed acceptance limits.
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.
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 product is supplied in the ordered delivery condition; mechanical strength, allowable pressure and maximum service temperature must be confirmed against the ordered specification and the design basis.
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 Seamless Stainless Steel 253Ma Tube.
Equivalent Grade
| UNS | Common grade name | EN material number | EN steel name | JIS grade | GB/T grade |
|---|---|---|---|---|---|
| S30815 | 253 MA | 1.4835 | X9CrNiSiNCe21-11-2 | Not listed in grade index | Not listed in grade index |
Grade correspondence does not make ASTM, ASME, EN, JIS and GB delivery requirements interchangeable. Confirm chemistry, heat treatment, mechanical properties, dimensions, testing and certification against the purchase specification. Approximate or unconfirmed correspondences retain their qualification. See the grade designation index.
Chemical Composition
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 |
Data source: ASTM A213-25 / ASME SA213 Table 1, 253MA row ≤ heat-analysis acceptance limits. Confirm the values against the ordered edition and the MTC.
Stainless Steel 253MA is specifically designed to maintain its strength and shape in high-temperature, high-stress environments.
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| ≥ 600 MPa | ≥ 310 MPa | ≥ 40% | ≤ 217 HBW / 95 HRB |
Typical Physical Properties
These physical properties highlight the material’s ability to perform reliably under a wide range of conditions.
| Density | Melting Point | Thermal Expansion | Thermal Conductivity | Modulus of Elasticity | Electrical Resistivity |
|---|---|---|---|---|---|
| 7.8 g/cm³ | 1400–1450 °C approx. | 17.0 μm/m·°C (20–100°C) | 15.0 W/m·K (20°C) | 195 GPa | 0.72 × 10⁻⁶ Ω·m (20°C) |
Note: Typical values for reference only — not acceptance limits. Physical and mechanical properties are reported on the MTC against the ordered standard, product form and condition.
ASTM A1016/A1016M Tube Size Tolerance Chart
Size Tolerance Chart (mm)
| Specified Outside Diameter (OD) (Inches) | Permissible Variations in OD (± Inches) |
|---|---|
| 1⁄2 to 1 | ±0.005 |
| Over 1 to 1-1⁄2 | ±0.008 |
| Over 1-1⁄2 to 2 | ±0.010 |
| Over 2 to 2-1⁄2 | ±0.012 |
| Over 2-1⁄2 to 3-1⁄2 | ±0.014 |
| Over 3-1⁄2 to 5 | ±0.020 |
Tolerance basis: permitted variations per the governing specification stated on this page and the applicable general-requirements standard (ASTM A1016 / ASME SA1016) for the ordered product form; the wall-thickness and length variations in this section follow the same basis.
| Specified Outside Diameter (OD) (Inches) | Specified Wall Thickness (WT) (Inches) | Permissible Variation (± Inches) |
|---|---|---|
| 1⁄2 to 1 (Inclusive) | 0.025 to 0.065(Inclusive) | ±0.010 |
| Over 0.065to 0.134 (Inclusive) | ±0.012 | |
| Over 1 to 1-1⁄2 (Inclusive) | 0.025 to 0.065 (Inclusive) | ±0.010 |
| Over 0.065 to 0.134 (Inclusive) | ±0.012 | |
| Over 1-1⁄2 to 2 (Inclusive) | 0.025 to 0.049 (Inclusive) | ±0.011 |
| Over 0.049 to 0.083 (Inclusive) | ±0.012 | |
| Over 0.083 to 0.148 (Inclusive) | ±0.014 | |
| Over 2 to 2-1⁄2 (Inclusive) | 0.032 to 0.065 (Inclusive) | ±0.013 |
| Over 0.065 to 0.109 (Inclusive) | ±0.015 | |
| Over 0.109 to 0.165 (Inclusive) | ±0.017 | |
| Over 2-1⁄2 to 3-1⁄2 (Inclusive) | 0.032 to 0.165 (Inclusive) | ±0.020 |
| Over 0.165 to 0.220 (Inclusive) | ±0.025 | |
| Over 3-1⁄2 to 5 (Inclusive) | 0.083 to 0.165 (Inclusive) | ±0.025 |
| Over 0.165 to 0.220 (Inclusive) | ±0.030 |
Length Tolerance
- For Specific Cut Lengths, the standard tolerance is +1⁄8 in. [3 mm], -0 in. [0 mm].
Important Note: The values presented here are based on the dimensional tolerance tables in ASTM A1016/A1016M (General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes), contains other essential requirements like straightness and details for tubes with ODs outside of this range. Always consult the latest official standard for design and procurement.
Common Industrial Applications
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.
Frequently Asked Questions
What sizes are available for 253MA seamless tube?
Which specification governs 253MA seamless tube?
What inspection documents are provided?
Technical review: page data reviewed by the Xinzhe technical desk on 2026-09-27. Chemistry acceptance limits are compiled from the governing ASTM/ASME specification stated on this page; mechanical and physical values are typical reference data and are not acceptance guarantees. Values must be confirmed against the standard edition in force at order time and the material test certificate.
Ready to Request a Quotation?
Send the size (OD and wall or schedule), quantity, length, end finish and the inspection items you need as acceptance criteria — you will get a written quotation stating the specification and edition, delivery condition, documents included and lead time.
Compare this grade with other austenitic and high-alloy grades in our stainless steel seamless pipe and tube ranges. Browse the Stainless Steel Seamless Pipe category. Minimum order quantity and lead time are confirmed on enquiry against the ordered grade, size and quantity.
