SS310
SS310 is a high-chromium, high-nickel austenitic stainless steel developed for elevated-temperature oxidation resistance. It offers better scaling resistance than conventional 18-8 stainless steels.
SS310 Information
SS310 is a high-chromium, high-nickel austenitic stainless steel developed for elevated-temperature oxidation resistance. It offers better scaling resistance than conventional 18-8 stainless steels.
Metallic winding and compatible ring components where service conditions are suitable.
| UNS Number | S31000 |
|---|---|
| Material Type | High-chromium, high-nickel austenitic stainless steel |
| Common Product Specification | ASTM A240 / A240M |
| Common / Applicable Specification | ASTM A240 / A240M |
| Typical Gasket Use | Metallic winding and compatible ring components where service conditions are suitable. |
SS310 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 | 0.25 max. |
| Manganese | Mn | 2.00 max. |
| Silicon | Si | 1.50 max. |
| Phosphorus | P | 0.045 max. |
| Sulfur | S | 0.030 max. |
| Chromium | Cr | 24.00–26.00 |
| Nickel | Ni | 19.00–22.00 |
| Iron | Fe | Balance |
SS310 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. | % |
| Hardness | 217 max. | HBW |
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.
SS310 Physical & Service Information
Reference physical properties and service considerations relevant to material selection for Spiral Wound Gaskets.
| Density | Approx. 7.9 g/cm³ |
|---|---|
| Structure | Austenitic |
| Oxidation Behaviour | Excellent scaling resistance in high-temperature oxidizing service. |
| Heat Treatment | Normally solution annealed; not hardened by heat treatment. |
| Service Selection | Actual allowable temperature depends on atmosphere, mechanical loading and applicable design code. |
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