AISI 430 (SS430) stainless steel
AISI 430 stainless steel with straight chromium (SS430) is one of the conventional ferritic stainless steels with magnetic properties and good formability, it has good corrosion resistance in mild atmosphere, mild oxidizing acid and organic acid.
AISI SAE ASTM 430 Specifications
The tables below show the technical specifications of type 430 stainless steel, including chemical composition and properties.
Chemical composition
The table below lists the composition of AISI 430 stainless steel.
| Chemical Composition Type 430,% | |||||||||
| ASTM | AISI (UNS) | C, ≤ | Yes, ≤ | Mn, ≤ | P, ≤ | S, ≤ | Cr | Ni, ≤ | products |
| ASTM A240/A240M | 430 (UNS S43000) | 0.12 | 1.00 | 1.00 | 0.040 | 0.030 | 16.0-18.0 | 0.75 | Plate, Sheet and Strip |
| ASTM A276/A276M | 0.12 | 1.00 | 1.00 | 0.040 | 0.030 | 16.0-18.0 | – | Bars and Shapes | |
- ASTM A240/A240M: Standard specification for chromium and chromium-nickel stainless steel plates, sheets and strips for pressure vessels and general applications.
- ASTM A276A/A276M: Standard specification for stainless steel bars and profiles.
- ASTM A580/A580M: Standard specification for stainless steel wire.
Mechanical Properties of AISI ASTM 430 Stainless Steel
The mechanical properties of type 430 (SS430) stainless steel are given in the tables below.
| SS 430 Mechanical Properties | ||||||||
| Type (UNS) | Tensile strength, MPa (ksi), ≥ | Yield strength, MPa (ksi), ≥ | Elongation by 50 mm, %, ≥ | Reduction in area, %, ≥ | Brinell hardness, ≤ | Rockwell hardness, ≤ | Cold bend, ≤ 25 mm (1 in.) | Product shape and condition |
| 430 (UNS S43000) | 415 (60) | 207 (30) | 20 | 45 | – | – | – | Bar, annealed, hot finished or cold finished |
| 450 (65) | 205 (30) | 22 | 183 HBW | 89 HRBW | 180° | Sheet, Plate and Strip | ||
| 485 (70) | 275 (40) | 16 | 45 | – | – | – | Annealed wire, cold finished | |
Physical properties
The tables below show the physical properties of grade 430 (SS430) stainless steel.
| Physical properties of SS 430 | |
| Density, g/cm3 (lb/in.3) | 7.8 (0.28) |
| Melting point, °C (°F) | 1425-1510 (2600-2750) |
| Specific heat capacity, J/kg · K (Btu/lb · °F) | 460 (0.11) at 0-100°C (32 to 212°F) |
| Electrical resistivity, μΩ·m | 0.60 to 20 ℃ |
| Magnetic Permeability of 430 Stainless Steel | 600-1100 (approximate) |
| Elastic Modulus (Modulus of Elasticity), GPa (10 6 psi) | 200 (29.0) |
| Thermal diffusivity, mm2/s | 7.3 |
| Thermal conductivity, W/m · K (Btu/ft · h · °F) | 26.1 (15.1) at 100 ℃ (212 °F) |
| 26.3 (15.2) at 500 ℃ (932 °F) | |
| Coefficient of thermal expansion, μm/m · °C (μin./in. · °F) | 10.4 (5.8), at 0-100℃ (32-212°F) |
| 11.0 (6.1), at 0-315 ℃ (32-600 °F) | |
| 11.4 (6.3), at 0-538℃ (32-1000°F) | |
AISI ASTM 430 Stainless Steel Heat Treatment
- Annealing: The recommended annealing treatment for 430 steel is 705-790°C (1300-1450°F).
- Forging: Typical forging temperature for SS430 is 815-1120°C (1500-2050°F).
Heat resistance
| Maximum service temperatures, °C (°F) | ||
| AISI | Intermittent service | Continuous service |
| 430 | 870 (1600) | 815 (1500) |
Welding
The ductility of type 430 (SS430) stainless steel is lower than that of austenite type, therefore weld cracking is more likely to occur, and a large amount of martensite is formed during cooling after welding, thus increasing sensitivity to cracks when cold. It is recommended to preheat to a temperature of 150-230 °C to minimize cracking of the weld.
Corrosion resistance
AISI 430 (SS430) stainless steel is suitable for use in mild atmospheres as well as mild oxidizing acids and organic acids. Type 430 stainless steel is limited in sulfuric acid environment; AISI 302 or 304 stainless steel replaces AISI 430 stainless steel in industrial environments; In the food processing environment, AISI 304 is commonly used; Marine environment, highly polluted atmosphere, harsher chemicals and corrosives require AISI 316 stainless steel or higher alloy materials
SS 430 Stainless Steel Applications
- Cookware and cutlery
- Desktop
- Automotive finishing
- Air filter
- Barbecue (barbecue)
- Wall Mount Cover
- Kitchen extractor hood
- Flanges
- Screws
Degree equivalent to AISI 430
AISI 430 stainless steel equivalent to Chinese GB, ISO, Japanese JIS and European EN standard (Germany DIN EN, British BS EN…) for reference.
| Degree equivalent to AISI 430 | |||||||||||||
| USA | European Union | Germany | ISO | Japan | China | Australia | |||||||
| Standard | Note (UNS) | Standard | Class (Steel Number) | Standard | Class (Steel Number) | Standard | Note (ISO number) | Standard | Note | Standard | Note | Standard | Note |
| AISI, ASTM A276/A276M; ASTM A240/A240M |
430 (UNS S43000) |
EN 10088-1; EN 10088-2; EN 10088-3 | X6Cr17 (1.4016) | DIN EN 10088-1; DIN 17440 |
X6Cr17 (1.4016) | ISO 15510 | X6Cr17 | JIS G4303 | SUS430 | GB/T 20878; GB/T 1220; GB/T 3280 |
1Ch17 (10Ch17) | ||
