X3CrTi17 (EN 1.4510 / UNS S43035 / JIS SUS430LX), commercially designated AISI 439, is a titanium-stabilized ferritic stainless steel containing 16.0–18.0% chromium. It is the direct metallurgical upgrade of standard 430 (1.4016): by reducing carbon (C ≤ 0.05%) and adding titanium at a minimum ratio of [4 × (C+N)] + 0.15%, the grade eliminates chromium carbide precipitation along grain boundaries after welding — a mechanism that standard 430 cannot match. The result is a nickel-free, fully ferritic material that delivers 304-grade intergranular corrosion resistance in welded structures at roughly 40% lower raw material cost. At FUSHUN METAL, X3CrTi17 / 1.4510 is produced and stocked under ISO 9001 and AS9120B certified quality systems — every heat undergoes OES spectrometric verification and is traceable to EN 10204 Type 3.1 mill certification.
Equivalent Grades of X3CrTi17 / S43035 Across International Standards
| Standard Body | Designation |
|---|---|
| EN (Europe) | X3CrTi17 / 1.4510 |
| ASTM (USA) | AISI 439 / UNS S43035 |
| JIS (Japan) | SUS430LX / SUS439 |
| GB (China) | 022Cr18Ti / 022Cr17Ti (S11863) |
| DIN (Germany) | X6CrTi17 / 1.4510 |
| AFNOR (France) | Z4CT17 |
| BS (UK) | X3CrTi17 |
| ISO | X3CrTi17 / 4510-430-35-I |
| GOST (Russia) | 08KH17T / 08Х17Т |
| SS (Sweden) | 2322 |
FUSHUN METAL supplies X3CrTi17 / 1.4510 certified to EN 10088-2, ASTM A240, and JIS G 4304 — full EN 10204 3.1 mill certification per shipment.
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Industrial Applications of X3CrTi17 / S43035
Automotive Exhaust
Exhaust piping, muffler shells, catalytic converter housings, resonator chambers, EGR coolers, turbo heat shields — continuous service to 815°C, superior thermal fatigue vs 430.
Heating & Boilers
Gas-water heater tanks, condensing boiler shells, heat exchanger tubes, combustion chamber liners — excellent hot-water corrosion resistance with no nickel leaching.
Food & Dairy Equipment
Steam-table components, cooking vessels, dairy processing tanks, brewery piping, confectionery molds — meets food-contact hygiene with 304-comparable welded corrosion resistance.
Home Appliances
Oven cavity liners, dishwasher tubs, washing machine drums, refrigerator trims, range-hood ducts — Ti stabilization prevents rust bleeding at welded seams after years of wet-dry cycling.
Construction & Elevator
Elevator cabin panels, escalator cladding, interior wall panels, ceiling grids, column covers — polishable to #8 mirror, magnetic for concealed fastener mounting.
Chemical & Process
Mild-acid storage tanks, pharmaceutical processing vessels, solvent piping, exhaust ducting — resists stress-corrosion cracking far better than 304 in hot-water and chloride-free chemical service.
FUSHUN METAL delivers X3CrTi17 / 1.4510 to all these sectors with full traceability — ISO 9001 & AS9120B certified quality, EN 10204 3.1 documentation, optional third-party inspection available.
Supply Range — X3CrTi17 / 1.4510 at FUSHUN METAL
Hot-Rolled Round Bar
Diameter: 10–800 mm
Length: 2,000–12,000 mm
Surface: Black / Peeled / Ground
Standard: EN 10088-3, ASTM A276
Cold-Rolled Sheet / Coil
Thickness: 0.3–6.0 mm
Width: 20–1,540 mm
Finish: 2B / BA / No.4 / HL / #8
Standard: EN 10088-2, ASTM A240
Forged Round Bar
Diameter: 100–1,200 mm
Length: 1,000–8,000 mm
Process: Open-die forged
UT tested per EN 10228-3
Welded Tube / Pipe
OD: 6–610 mm
WT: 0.5–20 mm
Length: up to 12,000 mm
Standard: EN 10296-2, ASTM A268
Additional forms: hot-rolled flat bar (3–120 × 20–800 mm), bright-drawn bar (h9/h11 tolerance), wire rod (ø5.5–20 mm), and custom-cut blanks. FUSHUN METAL holds ready stock of X3CrTi17 / 1.4510 in standard dimensions with short lead times — all products issued with ISO 9001 & AS9120B certificates of conformance.
Chemical Composition of X3CrTi17 per EN 10088-2
| C | Si | Mn | P | S | Cr | Ti | Fe |
|---|---|---|---|---|---|---|---|
| ≤ 0.050 | ≤ 1.00 | ≤ 1.00 | ≤ 0.040 | ≤ 0.015 | 16.0–18.0 | [4×(C+N)]+0.15 – 0.80 | Balance |
All values in weight %. The titanium addition follows a critical stoichiometric rule: Ti ≥ 4 × (C + N) + 0.15% — ensuring sufficient Ti is available to bind all interstitial carbon and nitrogen, thereby preventing chromium carbide/nitride precipitation at grain boundaries during welding or elevated-temperature exposure. At FUSHUN METAL, chemistry verification uses OES spectrometry with LECO combustion for carbon/sulfur cross-check on every heat. Each order is shipped with EN 10204 Type 3.1 certification signed by our ISO 9001 / AS9120B authorized inspector.
Mechanical Properties of X3CrTi17 in Annealed Condition (+A)
| Property | Value | Standard / Condition |
|---|---|---|
| Tensile Strength, Rm | 420 – 600 MPa | EN 10088-2, +A, all thicknesses |
| Yield Strength, Rp0.2 | ≥ 230 MPa (L) / ≥ 240 MPa (T) | EN 10088-2, +A, ≤ 8 mm |
| Elongation A | ≥ 23% | EN 10088-2, proportional gauge |
| Hardness | ≤ 200 HBW | EN 10088-2 / EN ISO 6506 |
| Density | ~7.70 g/cm³ | Physical; magnetic (ferritic) |
| Thermal Conductivity | ~25 W/(m·K) at 20°C | EN 10088-1 reference |
| Modulus of Elasticity | ~220 GPa at 20°C | EN 10088-1 |
| Thermal Expansion Coeff. | 10.0 × 10-6/K (20–200°C) | Lower than austenitic grades |
| Scaling Resistance | ≤ 815°C continuous | Oxidizing atmosphere |
Annealing is performed at 750–850°C (or 780–950°C per ASTM practice) followed by air or water cooling. This grade is non-hardenable by quench-and-temper. Hot working is carried out at 800–1,100°C with air cooling. FUSHUN METAL conducts per-heat tensile tests per ISO 6892-1 on a calibrated universal testing machine, with Brinell hardness verification on every bar end. Forged products are optionally ultrasonically tested per EN 10228-3 for internal soundness. Matching ER439 / ER430Ti filler wire is available alongside base material orders for a fully compatible welding package.
Frequently Asked Questions — X3CrTi17 / 1.4510
What makes X3CrTi17 different from standard 430 (1.4016)?
The decisive difference is titanium stabilization. Standard 430 loses corrosion resistance in the weld HAZ because chromium carbides precipitate at grain boundaries — a phenomenon called sensitization. X3CrTi17 / 439 adds Ti at a stoichiometric ratio of Ti ≥ 4 × (C+N) + 0.15%, which preferentially ties up carbon and nitrogen, keeping chromium in solution. The practical outcome: after welding, 439 retains intergranular corrosion resistance comparable to 304 — something standard 430 cannot deliver. Additionally, 439 offers better hot-water corrosion performance and higher permissible service temperature (815°C vs ~700°C for 430).
Can X3CrTi17 / 439 replace 304 stainless steel?
In many indoor and hot-water applications — yes. X3CrTi17 offers 304-comparable intergranular corrosion resistance in welded structures, higher thermal conductivity (~25 vs ~15 W/m·K), lower thermal expansion, and roughly 40% lower raw material cost (nickel-free). It also resists stress-corrosion cracking far better than 304. However, it cannot replace 304 in marine, high-chloride, or strongly acidic environments where the 8–10.5% nickel content of 304 provides essential pitting resistance. For condensing boilers, water heaters, exhaust systems, and food equipment — 439 is an excellent, cost-effective substitute.
Is X3CrTi17 weldable? What procedures are recommended?
Yes — titanium stabilization makes X3CrTi17 among the most weldable ferritic grades. Use TIG or MIG with ER439 / ER430Ti filler. No pre-heating is required for thin sections; for thicknesses above 3 mm, a light pre-heat to 150–200°C helps avoid cold cracking. Post-weld annealing at 750–850°C is recommended to relieve residual stress and fully restore ductility in the HAZ. FUSHUN METAL can supply matching ER439 filler wire alongside base material for a complete, compatible welding solution.
How does FUSHUN METAL ensure X3CrTi17 / 1.4510 quality?
FUSHUN METAL applies a five-stage quality protocol: (1) incoming billet screening by OES spectrometry with LECO C/S verification; (2) titanium-stabilization ratio audit — Ti content is confirmed to meet Ti ≥ 4 × (C+N) + 0.15%; (3) in-process dimensional checks during rolling/forging; (4) post-annealing mechanical testing (tensile per ISO 6892-1, Brinell hardness per EN ISO 6506 on every bar end); (5) final visual/dimensional inspection and mark-stamping. The entire chain runs under ISO 9001 and AS9120B certification, with each kilogram traceable to its melt origin via EN 10204 3.1 certification.
How does 439 compare with 441 (S43940) and 436?
439 (X3CrTi17, Ti-only stabilized) is the entry-level stabilized ferritic — ideal for exhaust systems, appliances, and welded structures where 430 falls short. 441 (S43940, Ti+Nb dual-stabilized) adds niobium for higher-temperature strength and creep resistance, making it suitable for heavy-gauge exhaust manifolds and turbo flanges. 436 (S43600, Mo + Nb) adds molybdenum for enhanced pitting resistance in road-salt and chloride exposure. For most applications between 430 and 304, 439 delivers the optimal cost-performance balance — FUSHUN METAL can advise on grade selection based on the client’s specific service environment.
