446 Stainless Steel Round Bar
Grade: 446/UNS S44600
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
446 stainless steel is a high chromium ferritic stainless steel grade designated as UNS S44600. It is specifically developed for high-temperature applications requiring excellent oxidation resistance, corrosion resistance, and dimensional stability under severe thermal conditions. With a chromium content of approximately 23–27%, 446 stainless steel provides outstanding resistance to scaling and oxidation at temperatures significantly higher than conventional ferritic stainless steels.
The alloy contains chromium as the primary alloying element, with no significant nickel addition, resulting in a ferritic microstructure. The high chromium content forms a stable chromium oxide protective layer, which provides exceptional oxidation resistance in air and many combustion environments. The ferritic structure provides low thermal expansion, good thermal conductivity, and excellent resistance to thermal fatigue during repeated heating and cooling cycles.
446 stainless steel bars are normally supplied in annealed condition and cannot be hardened through heat treatment. The material maintains good mechanical stability at elevated temperatures and offers superior resistance to sulfur-containing gases, carburizing atmospheres, and oxidation environments. However, due to its high chromium content and ferritic structure, it has lower ductility and toughness compared with austenitic stainless steels, especially at room temperature.
446 stainless steel bars are widely used in furnace components, heat treatment equipment, boiler systems, combustion chambers, petrochemical processing equipment, and high-temperature industrial applications. It is particularly suitable for components exposed to continuous service temperatures up to approximately 1100°C where oxidation resistance and thermal stability are critical.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS S44600 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS S44600 | Stainless Steel Bars for Pressure Equipment |
| UNS | S44600 | 446 Stainless Steel Grade |
| JIS | JIS G4303 SUS446 | Stainless Steel Bars |
| EN | EN 10088-3 1.4763 | X10CrAl24 Stainless Steel (Comparable Grade) |
| DIN | DIN 1.4763 | Equivalent European Material Designation |
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 | Annealing |
| Heat Treatment Temperature | Approximately 760–850°C followed by controlled cooling |
| Surface Condition | Black Surface, Bright Surface, Ground Surface, Polished Surface |
| Dimensional Tolerance | According to ASTM A276 / customer requirements |
| Inspection | Chemical Analysis, Mechanical Testing, Dimensional Inspection |
| Supply Condition | Annealed, Cold Finished, Machined Condition |
Chemical Composition (%)
| Element | Composition Requirement |
| Carbon (C) | ≤ 0.20 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.50 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 23.00 – 27.00 |
| Nickel (Ni) | ≤ 0.75 |
| Molybdenum (Mo) | ≤ 0.50 |
| Nitrogen (N) | ≤ 0.25 |
| Iron (Fe) | Balance |
Mechanical Properties (Annealed Condition)
| Property | Requirement |
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 275 MPa |
| Elongation | ≥ 20% |
| Hardness | ≤ 241 HB (Typical) |
| Condition | Annealed |
| Industry | Applications |
| Heat Treatment Industry | Furnace parts, furnace supports, heat shields |
| Power Generation | Boiler components, combustion equipment |
| Petrochemical Industry | High-temperature processing equipment |
| Chemical Industry | Oxidation-resistant process equipment |
| Glass Industry | Glass furnace components and supports |
| Industrial Heating | Burner components, radiant tubes |
| Metallurgical Industry | High-temperature fixtures and furnace hardware |
446 stainless steel is a high chromium ferritic stainless steel grade designated as UNS S44600. It is specifically developed for high-temperature applications requiring excellent oxidation resistance, corrosion resistance, and dimensional stability under severe thermal conditions. With a chromium content of approximately 23–27%, 446 stainless steel provides outstanding resistance to scaling and oxidation at temperatures significantly higher than conventional ferritic stainless steels.
The alloy contains chromium as the primary alloying element, with no significant nickel addition, resulting in a ferritic microstructure. The high chromium content forms a stable chromium oxide protective layer, which provides exceptional oxidation resistance in air and many combustion environments. The ferritic structure provides low thermal expansion, good thermal conductivity, and excellent resistance to thermal fatigue during repeated heating and cooling cycles.
446 stainless steel bars are normally supplied in annealed condition and cannot be hardened through heat treatment. The material maintains good mechanical stability at elevated temperatures and offers superior resistance to sulfur-containing gases, carburizing atmospheres, and oxidation environments. However, due to its high chromium content and ferritic structure, it has lower ductility and toughness compared with austenitic stainless steels, especially at room temperature.
446 stainless steel bars are widely used in furnace components, heat treatment equipment, boiler systems, combustion chambers, petrochemical processing equipment, and high-temperature industrial applications. It is particularly suitable for components exposed to continuous service temperatures up to approximately 1100°C where oxidation resistance and thermal stability are critical.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS S44600 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS S44600 | Stainless Steel Bars for Pressure Equipment |
| UNS | S44600 | 446 Stainless Steel Grade |
| JIS | JIS G4303 SUS446 | Stainless Steel Bars |
| EN | EN 10088-3 1.4763 | X10CrAl24 Stainless Steel (Comparable Grade) |
| DIN | DIN 1.4763 | Equivalent European Material Designation |
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 | Annealing |
| Heat Treatment Temperature | Approximately 760–850°C followed by controlled cooling |
| Surface Condition | Black Surface, Bright Surface, Ground Surface, Polished Surface |
| Dimensional Tolerance | According to ASTM A276 / customer requirements |
| Inspection | Chemical Analysis, Mechanical Testing, Dimensional Inspection |
| Supply Condition | Annealed, Cold Finished, Machined Condition |
Chemical Composition (%)
| Element | Composition Requirement |
| Carbon (C) | ≤ 0.20 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.50 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 23.00 – 27.00 |
| Nickel (Ni) | ≤ 0.75 |
| Molybdenum (Mo) | ≤ 0.50 |
| Nitrogen (N) | ≤ 0.25 |
| Iron (Fe) | Balance |
Mechanical Properties (Annealed Condition)
| Property | Requirement |
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 275 MPa |
| Elongation | ≥ 20% |
| Hardness | ≤ 241 HB (Typical) |
| Condition | Annealed |
| Industry | Applications |
| Heat Treatment Industry | Furnace parts, furnace supports, heat shields |
| Power Generation | Boiler components, combustion equipment |
| Petrochemical Industry | High-temperature processing equipment |
| Chemical Industry | Oxidation-resistant process equipment |
| Glass Industry | Glass furnace components and supports |
| Industrial Heating | Burner components, radiant tubes |
| Metallurgical Industry | High-temperature fixtures and furnace hardware |
