253MA Stainless Steel Round Bar
Grade: 253MA/UNS S30815
Size:
Cold drawn: φ4mm-φ60mm
Hot Rolled: φ16mm-φ230mm
Forged: φ230mm-φ1200mm
Surface Finish: Black Annealed, Polished Bright, Centerless Grinding
Diameter Tolerance: H9, H11, h9, h11 etc
- Fast Shipping / Ready Stock
- ISO 9001 Direct Factory
- Custom Cutting & Processing
- 100% MTC & SGS Inspection Supported
253MA stainless steel, designated as UNS S30815, is a high-performance heat-resistant austenitic stainless steel developed for applications requiring excellent oxidation resistance, high-temperature strength, and resistance to thermal cycling. It belongs to the family of nitrogen-strengthened, rare-earth alloyed stainless steels and is specifically designed for continuous service at elevated temperatures up to approximately 1150°C (2100°F).
The alloy combines a high chromium content with controlled additions of nickel, silicon, nitrogen, and rare-earth elements (mainly cerium). Chromium provides oxidation resistance by forming a stable chromium oxide layer, while silicon improves scaling resistance. Nitrogen strengthens the austenitic matrix and enhances high-temperature mechanical properties. Rare-earth additions improve oxide scale adhesion, reducing spalling during thermal cycling.
253MA stainless steel provides superior high-temperature performance compared with conventional heat-resistant grades such as 304H and 310S. It offers excellent resistance to oxidation, carburization, nitriding, and thermal fatigue. Although it contains less nickel than 310S, 253MA achieves higher creep strength and better oxidation resistance in many high-temperature applications due to its nitrogen strengthening and optimized alloy design.
The material maintains a fully austenitic microstructure and offers good weldability, fabricability, and toughness. 253MA stainless steel bars are generally supplied in solution annealed condition to maximize corrosion resistance and high-temperature performance. The alloy performs particularly well under cyclic heating and cooling conditions where oxide scale stability is critical.
253MA stainless steel bars are widely used in furnace components, heat treatment equipment, petrochemical processing units, combustion systems, boiler components, waste incineration equipment, and high-temperature industrial applications where long-term oxidation resistance and mechanical stability are required.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS S30815 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS S30815 | Stainless Steel Bars for Pressure Equipment |
| ASTM | ASTM A240 / A240M – UNS S30815 | Heat Resistant Stainless Steel Products |
| UNS | S30815 | 253MA Stainless Steel Grade |
| EN | EN 10088-3 1.4835 | X9CrNiSiNCe21-11-2 Stainless Steel |
| DIN | 1.4835 | X9CrNiSiNCe21-11-2 |
| JIS | SUS 310S / SUS XM15 Equivalent Family | Heat Resistant Austenitic Stainless Steel |
Stainless Steel Bar Execution Standards
| Item | Specification |
| Product Type | Round Bar, Square Bar, Hexagonal Bar |
| Manufacturing Process | Hot Rolled, Cold Drawn, Peeled, Ground, Polished |
| Heat Treatment | Solution Annealing |
| Solution Treatment Temperature | Approximately 1050–1150°C followed by rapid cooling |
| Microstructure | Fully Austenitic |
| Service Temperature | Up to approximately 1150°C |
| Surface Condition | Black Surface, Bright Surface, Ground Surface, Polished Surface |
| Dimensional Tolerance | According to ASTM A276 / ASTM A479 |
| Inspection | Chemical Analysis, Tensile Testing, Hardness Testing, Grain Structure Inspection |
| Supply Condition | Solution Annealed Condition |
Chemical Composition (%)
| Element | Composition Requirement |
| Carbon (C) | ≤ 0.10 |
| Silicon (Si) | 1.40 – 2.00 |
| Manganese (Mn) | ≤ 0.80 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 20.00 – 22.00 |
| Nickel (Ni) | 10.00 – 12.00 |
| Nitrogen (N) | 0.14 – 0.20 |
| Cerium (Ce) | 0.03 – 0.08 |
| Iron (Fe) | Balance |
Mechanical Properties
Solution Annealed Condition
| Property | Requirement |
| Tensile Strength | ≥ 650 MPa |
| Yield Strength (0.2% Offset) | ≥ 310 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 223 HB |
| Condition | Solution Annealed |
| Industry | Applications |
| Heat Treatment Industry | Furnace parts, furnace rollers, radiant tubes |
| Petrochemical Industry | Reformers, cracking furnace components |
| Power Generation | Boiler components, combustion equipment |
| Waste Treatment | Incinerator components, burner parts |
| Steel Industry | Heat-resistant fixtures, furnace supports |
| Chemical Industry | High-temperature processing equipment |
| Energy Industry | Heat exchangers and thermal equipment |
253MA stainless steel, designated as UNS S30815, is a high-performance heat-resistant austenitic stainless steel developed for applications requiring excellent oxidation resistance, high-temperature strength, and resistance to thermal cycling. It belongs to the family of nitrogen-strengthened, rare-earth alloyed stainless steels and is specifically designed for continuous service at elevated temperatures up to approximately 1150°C (2100°F).
The alloy combines a high chromium content with controlled additions of nickel, silicon, nitrogen, and rare-earth elements (mainly cerium). Chromium provides oxidation resistance by forming a stable chromium oxide layer, while silicon improves scaling resistance. Nitrogen strengthens the austenitic matrix and enhances high-temperature mechanical properties. Rare-earth additions improve oxide scale adhesion, reducing spalling during thermal cycling.
253MA stainless steel provides superior high-temperature performance compared with conventional heat-resistant grades such as 304H and 310S. It offers excellent resistance to oxidation, carburization, nitriding, and thermal fatigue. Although it contains less nickel than 310S, 253MA achieves higher creep strength and better oxidation resistance in many high-temperature applications due to its nitrogen strengthening and optimized alloy design.
The material maintains a fully austenitic microstructure and offers good weldability, fabricability, and toughness. 253MA stainless steel bars are generally supplied in solution annealed condition to maximize corrosion resistance and high-temperature performance. The alloy performs particularly well under cyclic heating and cooling conditions where oxide scale stability is critical.
253MA stainless steel bars are widely used in furnace components, heat treatment equipment, petrochemical processing units, combustion systems, boiler components, waste incineration equipment, and high-temperature industrial applications where long-term oxidation resistance and mechanical stability are required.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS S30815 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS S30815 | Stainless Steel Bars for Pressure Equipment |
| ASTM | ASTM A240 / A240M – UNS S30815 | Heat Resistant Stainless Steel Products |
| UNS | S30815 | 253MA Stainless Steel Grade |
| EN | EN 10088-3 1.4835 | X9CrNiSiNCe21-11-2 Stainless Steel |
| DIN | 1.4835 | X9CrNiSiNCe21-11-2 |
| JIS | SUS 310S / SUS XM15 Equivalent Family | Heat Resistant Austenitic Stainless Steel |
Stainless Steel Bar Execution Standards
| Item | Specification |
| Product Type | Round Bar, Square Bar, Hexagonal Bar |
| Manufacturing Process | Hot Rolled, Cold Drawn, Peeled, Ground, Polished |
| Heat Treatment | Solution Annealing |
| Solution Treatment Temperature | Approximately 1050–1150°C followed by rapid cooling |
| Microstructure | Fully Austenitic |
| Service Temperature | Up to approximately 1150°C |
| Surface Condition | Black Surface, Bright Surface, Ground Surface, Polished Surface |
| Dimensional Tolerance | According to ASTM A276 / ASTM A479 |
| Inspection | Chemical Analysis, Tensile Testing, Hardness Testing, Grain Structure Inspection |
| Supply Condition | Solution Annealed Condition |
Chemical Composition (%)
| Element | Composition Requirement |
| Carbon (C) | ≤ 0.10 |
| Silicon (Si) | 1.40 – 2.00 |
| Manganese (Mn) | ≤ 0.80 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 20.00 – 22.00 |
| Nickel (Ni) | 10.00 – 12.00 |
| Nitrogen (N) | 0.14 – 0.20 |
| Cerium (Ce) | 0.03 – 0.08 |
| Iron (Fe) | Balance |
Mechanical Properties
Solution Annealed Condition
| Property | Requirement |
| Tensile Strength | ≥ 650 MPa |
| Yield Strength (0.2% Offset) | ≥ 310 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 223 HB |
| Condition | Solution Annealed |
| Industry | Applications |
| Heat Treatment Industry | Furnace parts, furnace rollers, radiant tubes |
| Petrochemical Industry | Reformers, cracking furnace components |
| Power Generation | Boiler components, combustion equipment |
| Waste Treatment | Incinerator components, burner parts |
| Steel Industry | Heat-resistant fixtures, furnace supports |
| Chemical Industry | High-temperature processing equipment |
| Energy Industry | Heat exchangers and thermal equipment |
