317 Stainless Steel Round Bar (UNS S31700)
317 Stainless Steel Round Bar (UNS S31700) is a molybdenum-bearing austenitic stainless steel offering enhanced corrosion resistance, especially against pitting and crevice corrosion in chloride-rich and acidic environments. With higher molybdenum content than 316, 317 round bars are well suited for chemical processing, marine, and pulp & paper industries where superior corrosion performance is essential.
Key Features
- Higher molybdenum content for improved pitting and crevice corrosion resistance
- Excellent resistance to chemical and acidic environments
- Good strength and toughness at both ambient and elevated temperatures
- Superior performance in chloride-rich conditions
- Good weldability and fabrication characteristics
- Non-magnetic in annealed condition
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | 317 |
| UNS | S31700 |
| EN | 1.4449 |
| DIN | X5CrNiMo18-15 |
| JIS | SUS 317 |
Sizes
| Diameter Range | Length |
|---|---|
| 3 mm – 500 mm | Random / Cut Length / Up to 6 meters |
| Custom Sizes | Available on request |
317 Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 18.00 – 20.00 |
| Nickel (Ni) | 11.00 – 15.00 |
| Molybdenum (Mo) | 3.00 – 4.00 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
Mechanical Properties of UNS S31700 Round Bar
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 217 HB |
Physical Properties of 317 Round Bar
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Range | 1370 – 1400°C |
| Thermal Conductivity | 14.0 W/m·K |
| Electrical Resistivity | 0.74 µΩ·m |
| Modulus of Elasticity | 193 GPa |
Types of 317 Stainless Steel Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Bright Bar
- Polished Stainless Steel Round Bar
- Forged Round Bar
Applications
- Chemical processing equipment
- Pulp and paper industry components
- Marine and coastal applications
- Heat exchangers and condensers
- Pharmaceutical and food processing equipment
- Oil & gas and petrochemical industries
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