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Seamless Stainless Steel 317L Pipe is a low-carbon austenitic alloy designed for superior resistance to pitting, crevice corrosion, and intergranular attack in chloride-rich environments. Composed of 18-20% chromium, 12-15% nickel, 3-4% molybdenum, and ≤0.03% carbon, it builds on the base of 316L by increasing molybdenum content and reducing carbon, eliminating carbide precipitation risks in welded components. Manufactured via seamless extrusion and cold-drawing to meet ASTM A312 and ASME SA312, it offers uniform wall thickness and a smooth bore for optimal flow characteristics.
The extra molybdenum (4% vs. 2% in 316L) elevates its Critical Pitting Temperature (CPT) to 60°C, making it suitable for more aggressive chloride solutions than standard 300-series steels.
| Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
| TP317L | ≤0.035 | ≤0.075 | ≤ 2.00 | ≤0.045 | ≤0.03 | 18.00-20.00 | 3.00-4.00 | 11.00-15.00 |
Enhanced Chloride Resistance: Resists pitting in 10,000 ppm Cl⁻ at 60°C and crevice corrosion under gaskets in 5,000 ppm Cl⁻ + 1,000 ppm Fe⊃3;⁺, outperforming 316L in stagnant saline environments.
Intergranular Corrosion Immunity: Ultra-low carbon (≤0.03%) prevents chromium carbide formation at grain boundaries, even after sensitization at 650°C for 2 hours.
High-Temperature Performance: Maintains ductility up to 800°C and resists oxidation in intermittent service up to 900°C, suitable for steam sterilization and furnace applications.
Excellent Weldability: Can be welded using all standard methods with 317L filler metal; no post-weld heat treatment is required, though rapid cooling minimizes sigma phase formation.
| Grade | Tensile Strength ksi (Mpa) | Yield Strength ksi (Mpa) | Elongation -% in 50 mm | Hardness (Brinell) MAX | Hardness Rockwell |
TP317L | ≥75(515) | ≥30(205) | ≥35 | ≤ 192HBW/200HV | ≤ 90HRB |
317L stainless steel, also known as UNS S31703, is a low-carbon, high-alloy austenitic stainless steel. It contains higher levels of chromium, nickel, and molybdenum compared to standard 304/304L stainless steel. Here’s how it is used in various industries:
Chemical and Petrochemical Industry:
Corrosion Resistance: 317L is highly resistant to corrosion in aggressive chemical environments, making it suitable for applications involving acids, chlorides, and other corrosive media.
Heat Exchangers: It is commonly used in heat exchangers, condensers, and other equipment where resistance to chloride-induced stress corrosion cracking (SCC) is critical.
Flue Gas Desulfurization (FGD): 317L is employed in FGD systems due to its resistance to sulfuric acid and other acidic gases.
Oil and Gas Industry:
Downhole Equipment: 317L is used in downhole components such as tubing, casing, and pipelines due to its excellent resistance to pitting, crevice corrosion, and sulfide stress cracking.
Seawater Applications: Its resistance to seawater and brine environments makes it suitable for offshore platforms, subsea pipelines, and marine equipment.
Pharmaceutical and Biotechnology Industry:
Cleanliness and Sterility: 317L is preferred for pharmaceutical and biotech applications due to its low carbon content, which minimizes carbide precipitation during welding and maintains cleanliness.
Bioprocessing Equipment: It is used in vessels, tanks, and piping systems for drug manufacturing and sterile processing.
Food and Beverage Industry:
Hygienic Surfaces: 317L is employed in food processing equipment, dairy tanks, and brewing vessels due to its smooth surface finish and resistance to corrosion from food acids.
Power Generation:
Boilers and Heat Exchangers: 317L is used in power plants for its high-temperature strength, corrosion resistance, and weldability.
Steam Condensers: Its resistance to chloride stress corrosion cracking is crucial in steam condenser tubes.
Desalination Plants:
Seawater Reverse Osmosis (SWRO): 317L is used in SWRO systems due to its resistance to chloride attack and pitting corrosion.
Remember that the specific application and conditions determine the suitability of 317L stainless steel. Always consult with materials engineers and industry experts to ensure proper material selection for your specific project!
317L (UNS S31703) is a low carbon corrosion resistant austenitic chromium-nickel-molybdenum stainless steel. The high levels of these elements assure the steel has superior chloride pitting and general corrosion resistance to the conventional 304/304L and 316/316L grades. The steel provides improved resistance relative to 316L in strongly corrosive environments containing sulfurous media, chlorides, and other halides.
The low carbon content of 317L enables it to be welded without intergranular corrosion resulting from chromium carbide precipitation enabling it to be used in the as-welded condition.
The grade 317L is non-magnetic in the annealed condition. It cannot be hardened by heat treatment; however the material will harden due to cold working. 317L can be easily welded and processed by standard shop fabrication practices.
