429 Stainless Steel Round Bar
Grade: 429/UNS S42900
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
429 stainless steel is a ferritic chromium stainless steel grade designated as UNS S42900. It was developed as a modified version of 430 stainless steel, offering improved corrosion resistance and mechanical properties through controlled alloying. As a ferritic stainless steel, 429 stainless steel contains a chromium-based microstructure that provides good resistance to atmospheric corrosion, oxidation, and many industrial environments while maintaining excellent dimensional stability.
The alloy contains chromium as the primary alloying element, which forms a protective chromium oxide passive layer that provides corrosion resistance. Compared with lower chromium ferritic grades, the higher chromium content improves resistance to oxidation and general corrosion. The ferritic structure provides good thermal conductivity, low thermal expansion, and resistance to stress corrosion cracking in chloride-containing environments compared with austenitic stainless steels.
429 stainless steel bars are normally supplied in annealed condition and cannot be significantly hardened by heat treatment. The material offers good machinability, moderate ductility, and stable mechanical performance at elevated temperatures. It can be fabricated by forming, machining, and welding processes; however, proper welding procedures are recommended to maintain corrosion resistance and avoid excessive grain growth in the heat-affected zone.
Due to its combination of corrosion resistance, heat resistance, and economical performance, 429 stainless steel bars are widely used in automotive exhaust components, heat exchangers, industrial equipment, architectural applications, appliance parts, and general engineering components. It is suitable for applications requiring moderate corrosion resistance, good oxidation resistance, and long-term dimensional stability.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS S42900 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS S42900 | Stainless Steel Bars for Pressure Equipment |
| UNS | S42900 | 429 Stainless Steel Grade |
| JIS | JIS G4303 SUS429 | Stainless Steel Bars |
| EN | EN 10088-3 1.4000 (Comparable Grade) | Ferritic Chromium Stainless Steel |
| DIN | DIN 1.4000 (Reference 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 760–820°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) | ≤ 0.12 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 14.00 – 16.00 |
| Nickel (Ni) | ≤ 0.60 |
| Nitrogen (N) | ≤ 0.030 |
| Iron (Fe) | Balance |
Mechanical Properties (Annealed Condition)
| Property | Requirement |
| Tensile Strength | ≥ 450 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | ≥ 22% |
| Hardness | ≤ 217 HB (Typical) |
| Condition | Annealed |
| Industry | Applications |
| Automotive Industry | Exhaust system components, catalytic converter parts |
| Heat Equipment | Heat exchangers, furnace components, thermal equipment |
| Appliance Industry | Kitchen equipment, household appliance components |
| Architectural Industry | Decorative panels, structural components |
| Chemical Industry | General corrosion-resistant equipment |
| Mechanical Engineering | Shafts, brackets, machined components |
| Industrial Equipment | Oxidation-resistant parts and supports |
429 stainless steel is a ferritic chromium stainless steel grade designated as UNS S42900. It was developed as a modified version of 430 stainless steel, offering improved corrosion resistance and mechanical properties through controlled alloying. As a ferritic stainless steel, 429 stainless steel contains a chromium-based microstructure that provides good resistance to atmospheric corrosion, oxidation, and many industrial environments while maintaining excellent dimensional stability.
The alloy contains chromium as the primary alloying element, which forms a protective chromium oxide passive layer that provides corrosion resistance. Compared with lower chromium ferritic grades, the higher chromium content improves resistance to oxidation and general corrosion. The ferritic structure provides good thermal conductivity, low thermal expansion, and resistance to stress corrosion cracking in chloride-containing environments compared with austenitic stainless steels.
429 stainless steel bars are normally supplied in annealed condition and cannot be significantly hardened by heat treatment. The material offers good machinability, moderate ductility, and stable mechanical performance at elevated temperatures. It can be fabricated by forming, machining, and welding processes; however, proper welding procedures are recommended to maintain corrosion resistance and avoid excessive grain growth in the heat-affected zone.
Due to its combination of corrosion resistance, heat resistance, and economical performance, 429 stainless steel bars are widely used in automotive exhaust components, heat exchangers, industrial equipment, architectural applications, appliance parts, and general engineering components. It is suitable for applications requiring moderate corrosion resistance, good oxidation resistance, and long-term dimensional stability.
ASTM / JIS / EN Standards
| Standard System | Standard / Grade | Description |
| ASTM | ASTM A276 / A276M – UNS S42900 | Stainless Steel Bars and Shapes |
| ASTM | ASTM A479 / A479M – UNS S42900 | Stainless Steel Bars for Pressure Equipment |
| UNS | S42900 | 429 Stainless Steel Grade |
| JIS | JIS G4303 SUS429 | Stainless Steel Bars |
| EN | EN 10088-3 1.4000 (Comparable Grade) | Ferritic Chromium Stainless Steel |
| DIN | DIN 1.4000 (Reference 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 760–820°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) | ≤ 0.12 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 14.00 – 16.00 |
| Nickel (Ni) | ≤ 0.60 |
| Nitrogen (N) | ≤ 0.030 |
| Iron (Fe) | Balance |
Mechanical Properties (Annealed Condition)
| Property | Requirement |
| Tensile Strength | ≥ 450 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | ≥ 22% |
| Hardness | ≤ 217 HB (Typical) |
| Condition | Annealed |
| Industry | Applications |
| Automotive Industry | Exhaust system components, catalytic converter parts |
| Heat Equipment | Heat exchangers, furnace components, thermal equipment |
| Appliance Industry | Kitchen equipment, household appliance components |
| Architectural Industry | Decorative panels, structural components |
| Chemical Industry | General corrosion-resistant equipment |
| Mechanical Engineering | Shafts, brackets, machined components |
| Industrial Equipment | Oxidation-resistant parts and supports |
