Name: 439 Stainless Steel Coil
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439 Stainless Steel Coil

439 stainless steel coil is a modified ferritic stainless steel coil. It is produced by adding stabilizing elements such as titanium (Ti) and niobium (Nb) to the 430 base and reducing the carbon and nitrogen content. Its core purpose is to serve as an economical alternative to 304 stainless steel coil, with superior corrosion resistance and weldability compared to ordinary 430.

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Product Introduction

439 Stainless Steel Coil is a titanium-stabilized ferritic stainless steel engineered to provide enhanced corrosion resistance and weldability compared to standard 430 grade, while maintaining the cost advantages of nickel-free ferritic stainless steels. With 17-19% chromium content and titanium stabilization (typically 0.50-1.00%), 439 offers improved resistance to intergranular corrosion and better high-temperature stability than conventional ferritic grades. This grade represents an optimal balance between performance and cost, making it suitable for applications requiring better corrosion resistance than 430 but where the premium cost of 304 is not justified.

Supplied in continuous coil form, 439 stainless steel combines the favorable physical properties of ferritic stainless steels—low thermal expansion, resistance to stress corrosion cracking, and magnetic properties—with enhanced corrosion resistance and fabricability. The titanium addition effectively stabilizes the alloy against sensitization during welding and exposure to moderate temperatures, making 439 particularly suitable for welded fabrications, exhaust systems, and heat exchanger applications. Its improved pitting resistance and overall corrosion performance make it a versatile choice for automotive, appliance, and architectural applications.

Product parameters

Item / Parameter	Specification for 439 Coil	Notes / Significance
Key Feature	The Enhanced Titanium-Stabilized Ferritic Stainless. Improved corrosion resistance over 430 with titanium stabilization for better weldability and intergranular corrosion resistance.	An upgraded 430-grade with better overall performance while maintaining cost-effectiveness.
Common Designations	UNS S43035 AISI 439 EN 1.4510, X3CrTi17 JIS SUS439LX GM 439M	Often specified in automotive and appliance industry standards.
Chemical Composition (Typical wt.%)	C: ≤ 0.07 Cr: 16.0 - 19.0 Ti: 0.50 - 1.00Mn: ≤ 1.00 Si: ≤ 1.00 Ni: ≤ 0.50 P: ≤ 0.040 S: ≤ 0.030	Titanium content (typically 0.5-1.0%) provides stabilization and improved properties.
Mechanical Properties (Annealed)	Tensile Strength (Rm): ≥ 415 - 550 MPa Yield Strength (Rp0.2): ≥ 240 - 275 MPa Elongation (A): ≥ 20-25% Hardness (HB): ≤ 183	Similar mechanical properties to 430 but with better corrosion resistance.
Physical Properties	Density: 7.70 g/cm³ Melting Range: 1425 - 1510 °C Thermal Expansion: 10.8 × 10⁻⁶/K (20-400°C) Thermal Conductivity: 25.0 W/m·K (100°C) Strongly magnetic	Low thermal expansion similar to carbon steel; beneficial for thermal cycling applications.
Heat Treatment	Annealing: 790-850°C, air cool Not hardenable by heat treatmentStress Relief: 650-760°C Maximum Service Temperature: 800°C	Can only be strengthened by cold working; good high-temperature stability.
Corrosion Resistance	Good resistance to atmospheric corrosion, nitric acid, organic acids, and fresh water. Better than 430, approaching 304 in many environments.	Suitable for automotive exhaust, appliance, and architectural applications.
Weldability	Excellent weldability due to titanium stabilization No post-weld heat treatment requiredMaintains corrosion resistance in weld zone	Titanium prevents sensitization and maintains properties across welds.
Key Standards (Coil)	ASTM A240 (Plate, Sheet, and Strip) ASTM A480 (General Requirements) EN 10088-2 JIS G4305 SAE J1396	Widely used in automotive exhaust and appliance applications.
Common Applications (from Coil)	• Automotive Exhaust Systems: Mufflers, catalytic converter housings, exhaust pipes • Appliance Components: Dishwasher liners, washing machine drums, oven cavities • Heat Exchangers: Automotive radiators, charge air coolers, condenser plates • Architectural: Interior trim, elevator panels, decorative moldings • Food Service: Sinks, range hoods, kitchen equipment • Industrial: Welded tanks, chemical containers (mild service) • Furniture: Outdoor furniture frames, structural components	Specifically designed for cost-effective applications requiring better performance than 430.

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FACTORY SHOW

FAQ

Q:What about your price?
A:Our price is very competitive because we are a factory. Feel free to contact us if you are interested in our products.

Q:Can I go to your factory to visit?
A:Of course, we welcome customers from all over the world to visit our factory.

Q:What product information do I need to provide?
A:You need to provide the grade, width, thickness, coating and the number of tons you need to purchase.

Q:Does the product have quality inspection before loading?
A:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.we
accept the third party inspection absolutely.

Q:How about the delivery time?
A:Within 3-15 days after we confirm you requirement.

Q:What is your terms of payment ?
A:T/T, L/C at sight, Cash, Western Union are all accepted if you have other payment,please contact me.

Q: Do you provide samples?
A:Yes,we could offer the sample for you to test but please pay freight fee.

Q:How do we trust your company?
A:We are a specialized company focusing on global steel trading and supply chain services. Our mission is to provide high-quality, multi-specification, and one-stop steel products and solutions to customers worldwide.

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