GRADE GUIDE · 321
321 is 18/8 stainless stabilised with titanium, built for sustained service in the 425–800 °C window where plain 304 would sensitise. It is the grade for exhaust systems, expansion bellows, heater components and heat-exchanger parts that cycle hot.
Also listed as: UNS S32100 · EN 1.4541 · X6CrNiTi18-10 · SUS 321
Stainless steel · cut_piece
2 × 1219 × 2438 mm · 46.96 kg
DIC · Origin No · 1 pcs · Listed 14 Aug 2026
AED 11,275.00 /pc≈ AED 240.1/kg · excl. VAT
Stainless steel · cut_piece
3 × 300 × 6000 mm · 42.66 kg
DIC · Origin No · 12 pcs · Listed 14 Aug 2026
AED 10,240.00 /pc≈ AED 240.0/kg · excl. VAT
Stainless steel · cut_piece
8 × 1010 × 1115 mm · 71.17 kg
DIC · Origin No · 1 pcs · Listed 14 Aug 2026
AED 17,085.00 /pc≈ AED 240.1/kg · excl. VAT
Stainless steel · cut_piece
8 × 1100 × 1460 mm · 101.5 kg
DIC · Origin No · 1 pcs · Listed 14 Aug 2026
AED 24,360.00 /pc≈ AED 240.0/kg · excl. VAT
Stainless steel · cut_piece
8 × 1935 × 2120 mm · 259.26 kg
DIC · Origin No · 1 pcs · Listed 14 Aug 2026
AED 62,225.00 /pc≈ AED 240.0/kg · excl. VAT
Stainless steel · cut_piece
10 × 1600 × 2000 mm · 252.8 kg
DIC · Origin No · 1 pcs · Listed 14 Aug 2026
AED 60,675.00 /pc≈ AED 240.0/kg · excl. VAT
Subject to Prior Sale and Final Availability Confirmation.
Between roughly 425 and 800 °C, ordinary austenitic stainless slowly precipitates chromium carbides and loses corrosion resistance. 321 side-steps this by tying its carbon to titanium instead, so the chromium stays in solution no matter how long the part sits at temperature. That makes it the practical choice for anything that lives hot: flare tips, exhaust manifolds, furnace furniture, aircraft-style bellows.
At room temperature it behaves much like 304 — similar strength, similar forming, slightly rougher polish because of titanium inclusions. Buy it for heat, not for looks: decorative and wet-corrosion work is better served by 304 or 316L at lower cost.
When the part spends real time between about 425 and 800 °C — exhausts, heater parts, bellows. Below that window 304 or 304L do the job for less; above it, look at 310S or nickel alloys.
No — it welds readily with standard austenitic practice, and its stabilisation means the weld zone keeps its corrosion resistance without further treatment. Filler 347 is the usual match.
No. It has no molybdenum, so its wet-corrosion behaviour is close to 304. For hot AND chloride-laden service, that is nickel-alloy territory — see Inconel 625.