SS 321 Stainless Steel
Titanium-stabilised 304 that resists intergranular corrosion at 425 – 815 °C. Used for exhausts and high-temperature service.
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What is SS 321?
SS 321 (UNS S32100, EN 1.4541) is an austenitic stainless steel containing 17.0–19.0% chromium and 9.0–12.0% nickel. Titanium-stabilised 304 that resists intergranular corrosion at 425 – 815 °C. Used for exhausts and high-temperature service. It is non-magnetic in the annealed condition, has a density of 7.92 g/cm³ and a minimum tensile strength of 515 MPa, and is used mainly for exhaust manifolds and expansion joints, aircraft and jet engine parts and refinery equipment.
- Type Austenitic (titanium stabilised)
- Equivalents UNS S32100 · EN 1.4541 · SUS 321
- Density 7.92 g/cm³
- Strength (min) 515 MPa tensile · 205 MPa yield
- Magnetic? Non-magnetic in the annealed condition
- Main uses Exhaust manifolds and expansion joints, aircraft and jet engine parts, refinery equipment
What is the chemical composition of SS 321?
Typical ASTM A240 limits, % by weight (single values are maximums).
| C | Mn | Si | P | S | Cr | Ni | Ti | N |
|---|---|---|---|---|---|---|---|---|
| 0.08 max | 2.00 max | 0.75 max | 0.045 max | 0.030 max | 17.0 – 19.0 | 9.0 – 12.0 | 5×(C+N) – 0.70 | 0.10 max |
What are the mechanical properties of SS 321?
| Tensile strength (min) | 515 MPa |
|---|---|
| Yield strength 0.2% (min) | 205 MPa |
| Elongation (min) | 40% |
| Hardness (max) | 95 HRB / 217 HB max |
| Density | 7.92 g/cm³ |
What is the equivalent of SS 321?
| ASTM / AISI | UNS | EN / W.Nr. | DIN | JIS |
|---|---|---|---|---|
| 321 | S32100 | 1.4541 | X6CrNiTi18-10 | SUS 321 |
Where is SS 321 used?
- Exhaust manifolds and expansion joints
- Aircraft and jet engine parts
- Refinery equipment
- High-temperature chemical process
Can SS 321 be welded?
Good. Usually welded with ER347 filler (niobium-stabilised), because titanium does not transfer well across the arc.
Forming and machining
Forms and machines like 304.
SS 321 sizes we supply
Sheets, plates, coils and pipes — common in exhaust and high-temperature applications.
SS 321 price compared with 304
Slightly above 304 because of the titanium addition. For today's rate, send us your size and quantity.
Our advice
321 keeps its corrosion resistance after long exposure to high temperatures, where plain 304 could become sensitised.
Values are typical ASTM A240 limits for flat products and are for guidance only. Always refer to the mill test certificate supplied with the material.
SS 321 — FAQs
What is the chemical composition of SS 321?
SS 321 contains up to 0.08% carbon, up to 2.00% manganese, up to 0.75% silicon, up to 0.045% phosphorus, up to 0.030% sulphur, 17.0–19.0% chromium, 9.0–12.0% nickel, 5×(C+N)–0.70% titanium and up to 0.10% nitrogen, with the balance iron (typical ASTM A240 limits).
What is the equivalent of SS 321?
SS 321 is UNS S32100, EN 1.4541 (X6CrNiTi18-10) and SUS 321 in the Japanese standard.
What is the density of SS 321?
The density of SS 321 is about 7.92 g/cm³ (7920 kg/m³).
Where can I buy SS 321 in Vadodara?
Sagar Sales Corporation supplies SS 321 sheet, plate, round bar, pipe, tube, flanges, slit coil, 316ti sheet in Vadodara with mill test certificates. Contact us for today's rate.
Get today's SS 321 rate
Tell us the grade, size, finish and quantity. We check stock and send a per-kg rate with dispatch date — usually the same working day.
- Rates direct from Vadodara stock
- Mill test certificate with every lot
- Cut-to-size and delivery all over India