SS317L
SS317L is a low-carbon austenitic stainless steel with more molybdenum than 316L. The higher molybdenum content improves resistance to pitting and crevice corrosion in many chloride and chemical environments.
SS317L Information
SS317L is a low-carbon austenitic stainless steel with more molybdenum than 316L. The higher molybdenum content improves resistance to pitting and crevice corrosion in many chloride and chemical environments.
Metallic winding and compatible ring components where service conditions are suitable.
| UNS Number | S31703 |
|---|---|
| EN / Werkstoff | 1.4438 (commonly associated) |
| Material Type | Low-carbon austenitic Cr-Ni-Mo stainless steel |
| Common / Applicable Specification | ASTM A240 / A240M |
| Typical Gasket Use | Metallic winding and compatible ring components where service conditions are suitable. |
SS317L Chemical Composition
Reference composition limits are shown below. Exact requirements should be confirmed against the applicable product specification and certified material documentation.
| Element / Constituent | Symbol | Composition / Information |
|---|---|---|
| Carbon | C | 0.030 max. |
| Manganese | Mn | 2.00 max. |
| Silicon | Si | 0.75 max. |
| Phosphorus | P | 0.045 max. |
| Sulfur | S | 0.030 max. |
| Chromium | Cr | 18.00–20.00 |
| Nickel | Ni | 11.00–15.00 |
| Molybdenum | Mo | 3.00–4.00 |
| Nitrogen | N | 0.10 max. |
| Iron | Fe | Balance |
SS317L Mechanical Properties
Reference room-temperature properties are shown for a commonly supplied condition. Exact requirements depend on product form, size, heat treatment and governing specification.
| Property | Reference Value | Unit / Basis |
|---|---|---|
| Tensile Strength | ≈515 min. | MPa |
| 0.2% Offset Yield Strength | ≈205 min. | MPa |
| Elongation | ≈40 min. | % |
Values shown are engineering reference data, not universal design allowables. Final procurement and design must use the governing specification, exact product form/condition and certified material test documentation.
SS317L Physical & Service Information
Reference physical properties and service considerations relevant to material selection for Spiral Wound Gaskets.
| Density | Approx. 8.0 g/cm³ |
|---|---|
| Structure | Austenitic |
| Corrosion Behaviour | Higher molybdenum improves localized corrosion resistance compared with 316L. |
| Weldability | Low carbon reduces sensitization risk. |
| Service Selection | Use the applicable product specification for exact mechanical requirements. |
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