SS317 / SS317L
Stainless steel 317 (SS317) is a modified version of stainless steel 316 (SS316) with higher molybdenum (Mo) addition to improve the pitting-corrosion resistance as well as enhance its strength. Stainless steel 317L (SS317L) is the low carbon version of SS317 providing improved corrosion resistance relative to stainless steel 316L (SS316L). The low carbon permits SS317L to be welded without sensitization to intergranular corrosion resulting from chromium carbide precipitation in the grain boundaries. Both SS317 and SS317L are widely used in pulp and paper making industry, chemical processing, petrochemical piping and textile industry.
ASTM A276 SS317 round bars, O.D=4″ Length=6m, UNS31700
1. UNS Designation & International Equivalent
| Type | UNS | JIS | EN/DIN | EN/BS | EN/NF | ISO | GB | GOST |
|---|---|---|---|---|---|---|---|---|
| 317 | S31700 | SUS 317 | X5CrNiMo17-13-3 | 316S33 | - | - | 0Cr19Ni13Mo3 | 08KH17H15M3T |
| 317L | S31703 | SUS 317L | X2CrNiMo18-15-4 | Part 4 317S12 | X2CrNiMo18-15-4 | 24 | 00Cr19Ni13Mo3 | 03KH16H15M3 |
2. Product Forms and Standards
| Product Forms | Material Standards |
|---|---|
| Plates, Sheets & Strips | ASTM A240 |
| Billets, Bars & Rods | ASTM A276, A314, A479. |
| Forgings(Flanges & Fittings) | ASTM A182, A473. |
| Wires | ASTM A478, A580. |
| Seamless and Welded Pipes | ASTM A312, A358, A813, A814. |
| Wrought Pipe Fittings | ASTM A403 |
3. Physical Properties of SS317/ SS317L
ASTM A312 TP317L seamless pipes, 12″ STD.
| Density | Melting Point | Thermal Expansion Coefficient | Thermal Conductivity |
|---|---|---|---|
| g/cm3 | °C | µm/m°C | W/mk |
| 8.00 | 1370 | 16 | 16.3 |
5. Chemical Composition of SS317/ SS317L
| Element | 317 | 317L |
|---|---|---|
| Carbon | ≤0.08 | ≤0.030 |
| Manganese | ≤2.00 | ≤2.00 |
| Phosphorus | ≤0.045 | ≤0.045 |
| Sulfur | ≤0.030 | ≤0.030 |
| Silicon | ≤0.75 | ≤0.75 |
| Chromium | 18.0-20.0 | 18.0-20.0 |
| Nickel | 11.0-15.0 | 11.0-15.0 |
| Molybdenum | 3.0-4.0 | 3.0-4.0 |
| Nitrogen | ≤0.10 | ≤0.10 |
6. Mechanical Properties of SS317/ SS317L
| Mechanical | Tensile Strength, min | Yield Strength, min | Elongation | Hardness | |||
|---|---|---|---|---|---|---|---|
| Grade | ksi | Mpa | ksi | Mpa | % | HBW | Rockwell |
| 317 | 75 | 515 | 30 | 205 | 35 | 217 | 95HRBW |
| 317L | 75 | 515 | 30 | 205 | 40 | 217 | 95HRBW |
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