434 Stainless Steel Round Bar (UNS S43400)
434 Stainless Steel Round Bar (UNS S43400) is a molybdenum-bearing ferritic stainless steel that offers improved corrosion resistance compared to standard 430, particularly against pitting and crevice corrosion in mildly aggressive environments. The addition of molybdenum enhances resistance to chlorides and acidic conditions, making 434 stainless steel round bars suitable for applications requiring better corrosion performance while retaining the cost advantages of ferritic stainless steels. This grade is magnetic in nature and provides good formability and oxidation resistance.
Key Features
- UNS Number: S43400
- Molybdenum added for enhanced pitting and crevice corrosion resistance
- Better corrosion resistance than 430 stainless steel
- Good oxidation resistance at elevated temperatures
- Cost-effective ferritic stainless steel
- Magnetic in nature
Specification
| Parameter | Details |
|---|---|
| Product Form | Round Bar |
| Grade | 434 Stainless Steel |
| UNS Number | S43400 |
| Standards | ASTM A276, ASTM A479, ASME SA276, ASME SA479 |
| Condition | Annealed, Hot Rolled, Cold Drawn |
| Surface Finish | Black, Bright, Polished, Turned |
| Heat Treatment | Annealed |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | 434 |
| UNS | S43400 |
| EN | 1.4113 |
| DIN | X6CrMo17 |
| JIS | SUS 434 |
Sizes
- Diameter Range: 5 mm to 350 mm
- Length: 3 m, 6 m, or as per customer requirement
- Custom cut-to-length sizes available
434 Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.12 |
| Chromium (Cr) | 16.0 – 18.0 |
| Molybdenum (Mo) | 0.75 – 1.25 |
| Nickel (Ni) | ≤ 0.75 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
UNS S43400 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 450 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | ≥ 22% |
| Hardness | ≤ 183 HB |
SS 434 Physical Properties
| Property | Value |
|---|---|
| Density | 7.7 g/cm³ |
| Melting Point | 1425 – 1510°C |
| Thermal Conductivity | 25.0 W/m·K |
| Electrical Resistivity | 0.60 µΩ·m |
| Modulus of Elasticity | 200 GPa |
Types of 434 Stainless Steel Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Bright Round Bar
- Turned and Polished Round Bar
- Centerless Ground Round Bar
Applications
- Automotive trim and exhaust components
- Fasteners, shafts, and machined parts
- Chemical processing equipment (mild environments)
- Marine and coastal applications with moderate chloride exposure
- Kitchen equipment and architectural components
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