ASTM A240 SS317L stainless steel plate

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SS317L stainless steel plate is a molybdenum-based austenitic stainless steel designed for extreme corrosive environments. 317L significantly improves chloride corrosion resistance, high temperature stability and welding performance by optimizing molybdenum content and low carbon design, becoming a core material in the fields of chemical industry, marine engineering, energy, etc. Our manufacturers can produce seamless and welded pipes to meet industry requirements. Contact us for more information and a free quote!

chemical composition of SS 1.4438 pipe

The chemical composition of 317L stainless steel is centered on high chromium (18.0-20.0%), nickel (11.0-15.0%) and molybdenum (3.0-4.0%), while strictly controlling carbon content (≤0.03%) and impurity elements (such as phosphorus ≤0.045%, sulfur ≤0.030%). 

corrosion resistance

Chloride corrosion resistance of ASTM A240 SS 317L

The high molybdenum content makes it perform well in high chloride ion environments such as seawater and bleach, and the pitting resistance index (PREN) is significantly higher than 316L, which is suitable for offshore platform pipelines and desalination equipment.

Acidic medium resistance of DIN 1.4438 plate

It has excellent resistance to highly corrosive media such as sulfuric acid, phosphoric acid, and formic acid, and can still operate stably in a 5% sulfuric acid solution (≤49°C).

Intergranular corrosion resistance of ASTM A240 UNS S31703 Plate

Low carbon combined with solution annealing process (1010-1150°C) reduces carbide precipitation and avoids post-weld intergranular corrosion, which is suitable for complex structures that do not require post-weld heat treatment.

High temperature stability of Stainless Steel 317L Plate

SS 317L exhibits excellent oxidation resistance in high temperature environments, and can maintain low scaling rate in intermittent use at 1600°F (about 871°C) or continuous use at 1700°F (about 899°C).

Physical properties of Werkstoff No 1.4438 Coil

317L's physical properties include density 7.98 g/cm³, melting point 1375-1421°C, thermal conductivity 14.4-21.5 W/(m·K), suitable for high temperature and high pressure equipment such as heat exchangers and chemical reactors.

Application areas of ASME SA240 Type 317L Plate

Chemical and petrochemical: used to manufacture reactors, storage tanks, piping systems.

Marine engineering: desalination equipment, submarine pipelines and ship components.

Energy and environmental protection: Flue gas desulfurization (FGD) systems, nuclear power plant cooling pipes and pollution control equipment.

Medical and food: Surface treatment polished to Ra < 0.8μm meets sterility requirements and is used for surgical instruments, pharmaceutical equipment and food processing production lines.

Cutting and forming of S 317L Plate

It is recommended to use plasma cutting or laser cutting, and avoid carbon arc gouging to prevent oxidation. Progressive processes are required for cold forming to reduce work hardening.

Welding of ss317L

Tungsten inert gas welding (GTAW) or metal inert gas welding (GMAW) is preferred. AWS E317L or nickel-based alloy is recommended as filler material. The interlayer temperature of the weld needs to be controlled below 60°C to ensure the corrosion resistance of the weld.

Heat treatment of S31703 sheet

Solution annealing (1010-1150°C) can eliminate processing stress and dissolve carbides, improving the toughness and corrosion resistance of the material.

317L stainless steel plate Comparison with similar materials

Compared with 316L, 317L has a higher molybdenum content (3-4% vs. 2-3%), which significantly improves the chloride corrosion resistance, especially for seawater and acidic medium environments. Compared with 317LMN (containing higher molybdenum and nitrogen), 317L has lower cost and better welding performance, but slightly inferior high temperature strength. In terms of economy, the initial cost of 317L is about 20-30% higher than that of 316L, but the service life can be extended by more than 50% under severe working conditions, with significant comprehensive benefits.

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