We are Riddhi Siddhi Impex, a Mumbai-based Stainless Steel 439 Strips manufacturer and supplier, established in 2002. We slit this titanium-stabilised ferritic grade to ASTM A240 / ASME SA-240, from 0.03 mm to 5 mm thick and 3 mm to 2000 mm wide, held within ±0.1 mm width tolerance. Our ISO 9001, 14001, and 45001-certified company holds ready stock, with EN 10204 Type 3.1 / 3.2 certificates on request.
Stainless Steel 439 strip is a ferritic grade carrying 17 to 19% chromium, stabilised with titanium alone. Titanium binds carbon and nitrogen into stable carbonitrides, so a welded seam keeps its intergranular corrosion resistance with no post-weld anneal. With almost no nickel, these stainless steel strips resist chloride stress corrosion cracking, are ferromagnetic, and will not harden by heat treatment. Grade 439 is commonly used for the cooler sections of automotive exhaust systems, while Grade 441 is preferred for hotter operating zones. Typical uses of 439 stainless steel Winding Strip include automotive exhaust systems, heat exchangers, mufflers, and catalytic converter components.
As a reliable 439 stainless steel strip supplier, all of our 439 stainless steel slit coils are cold slit on our own lines rather than resold at mill width. Strip despatches annealed to ASTM A240 in gauges from 0.03 mm to 5 mm, with five finishes, four edge conditions, and batch traceability from mother coil to packing list.
We provide ASTM A240 Type 439 strips in the annealed soft condition, finished to five surfaces, edge-conditioned four ways, and slit to the exact width your line runs.
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA-240, ASTM A480 |
| Thickness | 0.03 mm to 5 mm |
| Width | 3 mm to 2000 mm |
| Width Tolerance | ±0.1 mm |
| Condition | Annealed (Soft) |
| Surface Finish | BA (Bright Annealed), 2B, Scotch-Brite, Matte, Matte PVC |
| Edge | Slit edge, Mill edge, Deburred edge, Round edge |
The titanium window matters most here. A floor of 0.20 + 4(C+N) traps interstitials, while the 1.10% ceiling protects surface quality on thin gauges.
| Element | Composition (% by weight) |
|---|---|
| Carbon (C) | 0.03 max |
| Manganese (Mn) | 1.00 max |
| Phosphorus (P) | 0.040 max |
| Sulphur (S) | 0.030 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 17.00 to 19.00 |
| Nickel (Ni) | 0.50 max |
| Titanium (Ti) | 0.20 + 4(C+N) min, 1.10 max |
| Nitrogen (N) | 0.03 max |
| Iron (Fe) | Balance |
| Aluminium (Al) | 0.15 max |
Annealed AISI 439 strip reaches 415 MPa minimum tensile strength with 22% elongation, enough headroom for drawing, folding, and lock-seaming. No temper ladder applies; this ferritic ships soft only.
| Property | Value (Annealed) |
|---|---|
|
Tensile Strength, minimum
|
415 MPa (60 ksi) |
|
Yield Strength (0.2% offset), minimum
|
205 MPa (30 ksi) |
|
Elongation in 50 mm, minimum
|
22% |
|
Hardness, maximum
|
89 HRB |
Buyers working from a drawing callout can match UNS S43035 strips against their regional standard here. Each row names the same titanium-stabilised 18Cr ferritic chemistry.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S43035 |
| Europe (EN) | X3CrTi17 |
| Germany (W.Nr.) | 1.4510 |
| Japan (JIS) | SUS430LX |
| China (GB) | 06Cr17Ti |
These 4 industries widely use the 439 ferritic stainless steel strips we slit. Each one trades the nickel premium of austenitic strip for a stabilised ferritic that welds cleanly and resists chloride cracking.
Muffler shells, resonator bodies, and tailpipe blanks form from SS 439 strips because the cold end of an exhaust collects acidic condensate at every shutdown. Stabilised welds shrug off that attack without annealing. Hot-end sections near the manifold move up to 441 strips.
Tank producers weld domestic water-heater bodies from Type 439 strips since chloride-bearing potable water cracks unprotected austenitic seams. Heat-exchanger fins press from the same slit coil. Ferritic steel conducts heat faster and expands less than 304, so brazed joints see less thermal stress.
Tube mills feed 439 SS strips straight from the slitter into forming rolls and weld a continuous longitudinal seam. Width held at ±0.1 mm keeps the seam gap steady, cutting weld defects at line speed. Condenser and exhaust tubing both start as this slit strip.
Appliance plants draw oven liners, sink bowls, and dishwasher panels from annealed 439 stainless steel strips. The 22% minimum elongation covers deep pressing, a BA or Scotch-Brite surface survives daily detergent wash-downs, and near-zero nickel keeps unit cost under comparable 304 pressings.
Consignments leave from Mumbai and Taloja in wooden cases or on pallets, with export documents prepared in-house.
| Parameter | Details |
|---|---|
| Packaging | Wooden cases, pallet packing |
| Incoterms | FOB, CIF, CFR, EXW Mumbai |
| Dispatch Points | Mumbai and Taloja warehouses |
| Standard Lead Time | 4 to 5 days |
| Urgent Dispatch | 2 to 3 days |
| Payment Terms | Advance, credit, LC |
| Certification | EN 10204 Type 3.1 / 3.2 on request |
Stainless Steel 439 strips in India typically run around ₹130-₹250 per kg, while export buyers generally pay about $1.4-$3.0 per kg. Ferrochrome surcharges move the base rate, and thickness, slit width, finish, and order volume set the final figure. WhatsApp your size for a confirmed quote.
We slit SS 439 strips from 0.03 mm to 5 mm thick and to any width between 3 mm and 2000 mm, held at ±0.1 mm on width.
The difference between 430 and 439 stainless steel strips is titanium stabilisation. Grade 439 locks up carbon so welded joints keep their corrosion resistance, while unstabilised 430 sensitises at the weld and suits unwelded work instead.
No, SS439 strips do not need post-weld annealing. Titanium ties up carbon and nitrogen before chromium carbides can form, so the heat-affected zone stays resistant to intergranular attack as welded.
Stainless Steel 439 strips are available in BA, 2B, Scotch-Brite, Matte, and Matte PVC finishes. Deburred or round edges suit forming work where a sharp slit edge would score tooling.
Yes, SS 439 strip and EN 1.4510 (X3CrTi17) describe the same titanium-stabilised 17 to 19% chromium ferritic steel. ASTM A240 lists it as Type 439, UNS S43035.
You can source custom-width Stainless Steel 439 Strips from us at Riddhi Siddhi Impex in Mumbai. We slit to your width, despatch in 4 to 5 days, and quote within 24 hours by phone or WhatsApp.
