SS321
SS321 is a titanium-stabilized austenitic stainless steel based on the 18-8 Cr-Ni family. Titanium ties up carbon as stable carbides, improving resistance to intergranular corrosion after exposure in the sensitization temperature range.
SS321 Information
SS321 is a titanium-stabilized austenitic stainless steel based on the 18-8 Cr-Ni family. Titanium ties up carbon as stable carbides, improving resistance to intergranular corrosion after exposure in the sensitization temperature range.
Metallic winding and compatible ring components where service conditions are suitable.
| UNS Number | S32100 |
|---|---|
| EN / Werkstoff | 1.4541 |
| Material Type | Titanium-stabilized austenitic stainless steel |
| Common / Applicable Specification | ASTM A240 / A240M |
| Typical Gasket Use | Metallic winding and compatible ring components where service conditions are suitable. |
SS321 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 | 0.08 max. |
| Manganese | Mn | 2.00 max. |
| Silicon | Si | 0.75 max. |
| Phosphorus | P | 0.045 max. |
| Sulfur | S | 0.030 max. |
| Chromium | Cr | 17.00–19.00 |
| Nickel | Ni | 9.00–12.00 |
| Nitrogen | N | 0.10 max. |
| Titanium | Ti | 5×(C+N) min.; 0.70 max. |
| Iron | Fe | Balance |
SS321 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.
SS321 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 |
| Stabilization | Titanium stabilization improves resistance to sensitization-related intergranular corrosion. |
| High-Temperature Behaviour | Often selected for service involving repeated exposure to intermediate/elevated temperatures. |
| Service Selection | Not a substitute for higher-alloy grades where chloride pitting resistance is the controlling requirement. |
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