317LMN Stainless Steel Round Bar (UNS S31726)
317LMN Stainless Steel Round Bar (UNS S31726) is a nitrogen-enhanced, low-carbon, high-molybdenum austenitic stainless steel developed for exceptional strength and superior resistance to pitting, crevice corrosion, and chemical attack. Compared to 317L, the addition of nitrogen significantly improves mechanical strength and corrosion resistance, making 317LMN round bars ideal for severe corrosive and high-stress environments such as chemical processing, marine, and offshore applications.
Key Features
- UNS Number: S31726
- Enhanced strength due to nitrogen addition
- Superior resistance to pitting and crevice corrosion
- Excellent performance in acidic and chloride-rich environments
- Low carbon content minimizes intergranular corrosion
- Good weldability and formability
- Suitable for demanding industrial and marine applications
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | 317LMN |
| UNS | S31726 |
| EN | 1.4449 |
| DIN | X2CrNiMoN18-18-5 |
| JIS | SUS 317LMN |
Sizes
- Diameter Range: 3 mm to 500 mm
- Length: 3 m, 6 m, or as per customer requirement
- Cut-to-length and custom sizes available
317LMN Stainless Steel Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Chromium (Cr) | 17.0 – 20.0 |
| Nickel (Ni) | 13.5 – 17.5 |
| Molybdenum (Mo) | 4.0 – 5.0 |
| Nitrogen (N) | 0.10 – 0.20 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
UNS S31726 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 620 MPa |
| Yield Strength (0.2% Offset) | ≥ 310 MPa |
| Elongation | ≥ 35% |
| Hardness | ≤ 240 HB |
317LMN Round Bar Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1370 – 1400°C |
| Thermal Conductivity | 15.5 W/m·K |
| Electrical Resistivity | 0.74 µΩ·m |
| Modulus of Elasticity | 193 GPa |
Types of 317LMN Round Bar
- Hot Rolled Round Bar
- Cold Drawn Round Bar
- Bright Bar
- Polished Round Bar
- Centerless Ground Round Bar
Applications
- Chemical and petrochemical processing equipment
- Offshore and marine components
- Oil and gas processing systems
- Pulp and paper industry machinery
- Heat exchangers and pressure vessels
- Desalination plants
- Pollution control and flue gas desulfurization systems
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