444 Stainless Steel Round Bar
Grade: 444/UNS S44400
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
444 stainless steel is a molybdenum-containing ferritic stainless steel grade designated as UNS S44400. It is a low-carbon, stabilized ferritic stainless steel developed to provide superior corrosion resistance compared with conventional ferritic grades such as 430 stainless steel. With the addition of molybdenum and stabilization elements such as titanium and/or niobium, 444 stainless steel offers excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, particularly in chloride-containing environments.
The alloy contains chromium as the primary corrosion-resistant element and molybdenum as an important addition for improving localized corrosion resistance. Chromium forms a stable passive oxide layer that protects the surface from general corrosion, while molybdenum enhances resistance to chloride-induced pitting and crevice attack. The low carbon content reduces the possibility of chromium carbide precipitation, and stabilizing elements improve resistance to intergranular corrosion after welding.
444 stainless steel bars are normally supplied in annealed condition and cannot be hardened by conventional heat treatment. The ferritic microstructure provides low thermal expansion, good thermal conductivity, and excellent resistance to stress corrosion cracking. Compared with austenitic stainless steels, 444 stainless steel provides improved resistance to chloride environments while maintaining good dimensional stability and cost efficiency.
Due to its excellent corrosion resistance and durability, 444 stainless steel bars are widely used in water treatment equipment, heat exchangers, chemical processing systems, food processing machinery, architectural applications, automotive components, and industrial piping systems. It is especially suitable for applications requiring corrosion resistance close to 316 stainless steel but with the advantages of a ferritic stainless steel structure.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS S44400 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS S44400 | Stainless Steel Bars for Pressure Equipment |
| UNS | S44400 | 444 Stainless Steel Grade |
| JIS | JIS G4303 SUS444 | Stainless Steel Bars |
| EN | EN 10088-3 1.4521 | X2CrMoTi18-2 Stainless Steel |
| DIN | DIN 1.4521 | 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 760–830°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) | ≤ 0.025 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 17.50 – 20.00 |
| Nickel (Ni) | ≤ 1.00 |
| Molybdenum (Mo) | 1.75 – 2.50 |
| Titanium + Niobium (Ti+Nb) | Stabilized Addition |
| Nitrogen (N) | ≤ 0.035 |
| Iron (Fe) | Balance |
Mechanical Properties (Annealed Condition)
| Property | Requirement |
| Tensile Strength | ≥ 415 MPa |
| Yield Strength (0.2% Offset) | ≥ 275 MPa |
| Elongation | ≥ 20% |
| Hardness | ≤ 210 HB (Typical) |
| Condition | Annealed |
| Industry | Applications |
| Water Treatment Industry | Water tanks, desalination equipment, piping systems |
| Chemical Industry | Chemical processing equipment, corrosion-resistant components |
| Heat Transfer Industry | Heat exchangers, condensers, cooling systems |
| Food Industry | Food processing machinery and sanitary equipment |
| Automotive Industry | Exhaust systems, emission control components |
| Architectural Industry | Exterior panels, structural components |
| Industrial Equipment | Pumps, valves, tanks, corrosion-resistant parts |
444 stainless steel is a molybdenum-containing ferritic stainless steel grade designated as UNS S44400. It is a low-carbon, stabilized ferritic stainless steel developed to provide superior corrosion resistance compared with conventional ferritic grades such as 430 stainless steel. With the addition of molybdenum and stabilization elements such as titanium and/or niobium, 444 stainless steel offers excellent resistance to pitting, crevice corrosion, and stress corrosion cracking, particularly in chloride-containing environments.
The alloy contains chromium as the primary corrosion-resistant element and molybdenum as an important addition for improving localized corrosion resistance. Chromium forms a stable passive oxide layer that protects the surface from general corrosion, while molybdenum enhances resistance to chloride-induced pitting and crevice attack. The low carbon content reduces the possibility of chromium carbide precipitation, and stabilizing elements improve resistance to intergranular corrosion after welding.
444 stainless steel bars are normally supplied in annealed condition and cannot be hardened by conventional heat treatment. The ferritic microstructure provides low thermal expansion, good thermal conductivity, and excellent resistance to stress corrosion cracking. Compared with austenitic stainless steels, 444 stainless steel provides improved resistance to chloride environments while maintaining good dimensional stability and cost efficiency.
Due to its excellent corrosion resistance and durability, 444 stainless steel bars are widely used in water treatment equipment, heat exchangers, chemical processing systems, food processing machinery, architectural applications, automotive components, and industrial piping systems. It is especially suitable for applications requiring corrosion resistance close to 316 stainless steel but with the advantages of a ferritic stainless steel structure.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS S44400 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS S44400 | Stainless Steel Bars for Pressure Equipment |
| UNS | S44400 | 444 Stainless Steel Grade |
| JIS | JIS G4303 SUS444 | Stainless Steel Bars |
| EN | EN 10088-3 1.4521 | X2CrMoTi18-2 Stainless Steel |
| DIN | DIN 1.4521 | 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 760–830°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) | ≤ 0.025 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 17.50 – 20.00 |
| Nickel (Ni) | ≤ 1.00 |
| Molybdenum (Mo) | 1.75 – 2.50 |
| Titanium + Niobium (Ti+Nb) | Stabilized Addition |
| Nitrogen (N) | ≤ 0.035 |
| Iron (Fe) | Balance |
Mechanical Properties (Annealed Condition)
| Property | Requirement |
| Tensile Strength | ≥ 415 MPa |
| Yield Strength (0.2% Offset) | ≥ 275 MPa |
| Elongation | ≥ 20% |
| Hardness | ≤ 210 HB (Typical) |
| Condition | Annealed |
| Industry | Applications |
| Water Treatment Industry | Water tanks, desalination equipment, piping systems |
| Chemical Industry | Chemical processing equipment, corrosion-resistant components |
| Heat Transfer Industry | Heat exchangers, condensers, cooling systems |
| Food Industry | Food processing machinery and sanitary equipment |
| Automotive Industry | Exhaust systems, emission control components |
| Architectural Industry | Exterior panels, structural components |
| Industrial Equipment | Pumps, valves, tanks, corrosion-resistant parts |
