TP 317/L - 1.4438
Wst. 1.4438
UNS S31703
Stock program: 3 – 38 mm OD / 1/8” – 1.1/2” OD
Specification: ASTM A 213/ASME SA 213 / EN 10216-5/EN 10305/ISO 15156-3 / NACE MR0175/PED 97/23 EC
Maximum service temperature: 430°C / 800°F
317L is a molybdenum-bearing austenitic stainless steel with greatly increased resistance to chemical attack as opposed to the conventional chromium-nickel austenitic steel alloys 304L & 316L. The addition of molybdenum gives alloy 317L tubing improved resistance to chloride and other halides. Due to its low carbon content the 317L tubing can be welded without risk of sanitization due to inter granular corrosion that can result from chromium carbide precipitation in the grain boundaries. 317L is non magnetic in the annealed condition, but may become slightly magnetic as result of welding.
Characteristics
- Resistance to sensitization during welding
- Higher creeps, stress-to-rapture and tensile strength at elevated temperatures
- Corrosion and pitting resistance
- Resistance in acidic and hand water areas
Market applications:
- Offshore, oil & gas
- Chemical
- Hydraulic
- Shipbuilding
- Refining
- Pulp and paper
Technical details
Technical composition (%) | Fe | Cr | Ni | Mo | Mn | Si | P | C | S | |
---|---|---|---|---|---|---|---|---|---|---|
317L | min | Bal. | 18.0 | 11.0 | 3.0 | - | - | - | - | - |
max | - | 20.0 | 15.0 | 4.0 | 2.00 | 1.00 | 0.040 | 0.035 | 0.030 |
Mechanical properties | 317L | |
---|---|---|
Tensile strenght (mpa, min) | 515 - 750 | |
Yield strength (0.2% offset mpa, min) | 205 | |
Elongation (%, min) | 35 | |
Density / weight (g / cm3 / kg) | 7.90 |