GRADE GUIDE · 409
409 is the entry-level ferritic stainless: about 11% chromium, titanium-stabilised, magnetic, and the cheapest way to get stainless heat and oxidation resistance. Its home ground is automotive exhausts, heat shields, silencers and dry high-temperature sheet work.
Also listed as: UNS S40900 · EN 1.4512 · X2CrTi12 · SUH 409
Stainless steel · cut_piece
2 × 1219 × 3000 mm · 56.32 kg
DIC · Origin No · 1 pcs · Listed 14 Aug 2026
AED 13,520.00 /pc≈ AED 240.1/kg · excl. VAT
Stainless steel · cut_piece
2 × 1219 × 2438 mm · 45.77 kg
DIC · Origin No · 10 pcs · Listed 14 Aug 2026
AED 10,985.00 /pc≈ AED 240.0/kg · excl. VAT
Stainless steel · cut_piece
2 × 1500 × 2440 mm · 56.36 kg
DIC · Origin No · 1 pcs · Listed 14 Aug 2026
AED 13,530.00 /pc≈ AED 240.1/kg · excl. VAT
Stainless steel · cut_piece
5 × 1500 × 3000 mm · 173.25 kg
DIC · Origin No · 4 pcs · Listed 14 Aug 2026
AED 41,580.00 /pc≈ AED 240.0/kg · excl. VAT
Stainless steel · cut_piece
5 × 1219 × 2438 mm · 114.42 kg
DIC · Origin No · 1 pcs · Listed 14 Aug 2026
AED 27,465.00 /pc≈ AED 240.0/kg · excl. VAT
Stainless steel · cut_piece
2 × 1219 × 2438 mm · 45.77 kg
DIC · Origin No · 2 pcs · Listed 14 Aug 2026
AED 10,985.00 /pc≈ AED 240.0/kg · excl. VAT
Subject to Prior Sale and Final Availability Confirmation.
409 exists because mild steel burns out of exhaust systems and 304 is overkill for them. With just enough chromium to form a protective scale and titanium stabilisation for weldability, it survives hot exhaust gas for years at a fraction of austenitic cost. It is magnetic, drabber in finish than 304, and perfectly happy that way — this is a working grade, not a decorative one.
Its limits are wet corrosion and appearance: it will show surface rust in humid coastal air, which is cosmetic on an exhaust but disqualifying on architecture. For visible or wet work, spend up to 304; for hot, dry, hidden parts, 409 off-cuts are the economical buy.
That is normal for the grade — 11% chromium slows corrosion but does not stop surface staining in humid or salty air. It remains structurally sound; if staining is unacceptable, the job wanted 304 or 316.
Yes — the titanium stabilisation makes it one of the friendlier ferritics to weld. Thin-gauge TIG and MIG work is routine; use a 409Nb or austenitic filler.
Life. Both are exhaust materials, but 409 outlasts aluminised steel severalfold once the coating scratches or ages — which is why OEM exhausts moved to it.