SS347
SS347 is a niobium-stabilized austenitic stainless steel related to SS304. Niobium stabilizes carbon, improving resistance to intergranular corrosion after welding or exposure in the sensitization temperature range.
SS347 Information
SS347 is a niobium-stabilized austenitic stainless steel related to SS304. Niobium stabilizes carbon, improving resistance to intergranular corrosion after welding or exposure in the sensitization temperature range.
Metallic winding and compatible ring components where service conditions are suitable.
| UNS Number | S34700 |
|---|---|
| EN / Werkstoff | 1.4550 |
| Material Type | Niobium-stabilized austenitic stainless steel |
| Common / Applicable Specification | ASTM A240 / A240M |
| Typical Gasket Use | Metallic winding and compatible ring components where service conditions are suitable. |
SS347 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 | 9.00–13.00 |
| Nitrogen | N | 0.10 max. |
| Niobium + Tantalum | Nb+Ta | 10×C min.; 1.00 max. |
| Iron | Fe | Balance |
SS347 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 | 201 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.
SS347 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 | Niobium stabilization improves resistance to sensitization-related intergranular attack. |
| High-Temperature Behaviour | Useful for welded and elevated-temperature service where stabilized 18-8 stainless steel is specified. |
| Service Selection | Verify compatibility with chloride concentration and process chemistry. |
Specify SS347 for your gasket
Share your gasket dimensions, service conditions and quantity for SS347 material options and pricing.