Stainless Steel 321 Seamless Pipes & Tubes Manufacturer & Supplier
SS 321 (UNS S32100) is a titanium-stabilized austenitic stainless steel designed for continuous service at temperatures between 425C-900C. The titanium addition prevents chromium carbide precipitation, ensuring resistance to intergranular corrosion after high-temperature exposure.
UNS: S32100 | Category: Austenitic Stainless Steel | Werkstoff Nr: 1.4541 | EN Name: X6CrNiTi18-10
SS 321 — Also Known As
SS 321 is also commonly known as SS 321, 321 SS, Stainless Steel 321 Seamless Pipes & Tubes, S32100, UNS S32100, 1.4541, Werkstoff 1.4541, W.Nr 1.4541, X6CrNiTi18-10, 321 stainless steel, aisi 321, astm 321, sus 321.
SS 321 — Applicable Standards & Specifications
SS 321 is commonly supplied to ASTM A213, ASME SA213, ASME SA269, ASTM A312, ASME SA312, ASTM A376, ASME SA376, EN 10216-5, DIN 17456.
Size Range
Outer Diameter: 1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness: SCH 5S to SCH 160
Chemical Composition (%)
| C | Mn | Si | Cr | Ni | Ti | P | S |
|---|---|---|---|---|---|---|---|
| 0.08 max | 2.00 max | 0.75 max | 17.0-19.0 | 9.0-12.0 | 5xC min | 0.045 max | 0.030 max |
Mechanical Properties
- Tensile Strength
- 515 MPa min
- Yield Strength
- 205 MPa min
- Elongation
- 35% min
- Hardness
- 95 HRB max
Physical Properties
- Density
- 7.92 g/cm3
- Melting Range
- 1400-1425 C
- Thermal Conductivity
- 16.1 W/m-K
- Electrical Resistivity
- 720 nOhm-m
- Specific Heat
- 500 J/kg-K
- Coeff. of Thermal Expansion
- 17.2 um/m-C
Corrosion Resistance
- Pitting Resistance (PREN)
- ~17.5
- Max Service Temp (Oxidizing)
- 900 C (continuous)
- Intergranular Corrosion
- Resistant (Ti stabilized)
- Stress Corrosion Cracking
- Susceptible in chlorides >60C
- General Corrosion Rate
- <0.1 mm/yr in mild acids
- Seawater Resistance
- Limited
Applicable Standards
- ASTM A312 / ASME SA312
- ASTM A213 / ASME SA213
- ASTM A269
- DIN EN 10216-5
Applications
- High-temperature exhaust systems
- Furnace parts and heat treatment equipment
- Expansion bellows
- Refinery process piping
- Aircraft exhaust manifolds
- Superheater tubes
Industries Served
- Petrochemical
- Power Generation
- Aerospace
- Heat Treatment
- Refineries
Key Advantages
- Excellent high-temperature strength and oxidation resistance
- Titanium stabilization prevents sensitization
- Suitable for continuous service up to 900C
- Superior to 304/304L for high-temperature applications
- Excellent creep resistance
Equivalent Grades
- ASTM
- TP321
- JIS
- SUS 321
- BS
- 321S31
- GOST
- 08Kh18N10T