439 Stainless Steel Coil

439 Stainless Steel – An 18% chromium, titanium-stabilized ferritic stainless steel that offers corrosion resistance comparable to 304 stainless steel. This grade combines the benefits of both chromium and titanium, providing enhanced weldability and exceptional resistance to stress corrosion cracking.

  • Place of Origin: Guangdong ,China(Mainland)
  • Payment Term: L/C At Sight 100%, T/T 30%
  • Delivery Time: Stock goods 7-15 days, Future goods within 25 days
  • Package Detail : Standard Sea-Worthy Packing
  • Price Term: EXW, FOB, CFR, CIF
  • Sample: Free
  • Mill Origin: Tisco, Posco, LISCO, Aoxing, Baoxin, etc.
  • Certificate: SGS, BV, IQI, TUV, ISO, etc
  • Grade : Grade 439, SS 439, Inox 439, AISI 439, SUS 439, 1.4510, UNS S43035, Acero 439
  • Finish: 2B, No.1, 1D, 2D, BA+PVC, No.4+PVC, Hairline+PVC, 8K/No.8, etc.
  • Thickness: 0.22-15.0mm
  • Width: 20-1540mm
  • Weight Per Coil: 5/10/20MT or customized
  • Stainless Steel Coil Edge: Slit Edge/ Mill Edge
  • Product Detail

    Product Tags

    SUS 304 Mirror 8K Stainless Steel Coil (1)

    What is 439 Stainless Steel?

    SUS 304 Mirror 8K Stainless Steel Coil (3)

    439 stainless steel is a titanium-stabilized ferritic alloy, recognized for its up to 1.10% titanium content, which significantly boosts its defense against intergranular corrosion. This steel was first introduced in the 1950s, initially aimed at direct-fired water heater tanks, but its applications have broadened considerably, notably in the EU, due to its outstanding weldability and robust resistance to stress corrosion cracking.

    Featuring a chromium content of 17% to 19%, 439 stainless steel provides strong corrosion resistance, capable of withstanding a range of oxidizing conditions from regular tap water to intense boiling acids. It’s especially commendable for its resistance to chloride-induced stress corrosion cracking. The alloy’s excellent weldability is a key advantage, allowing it to maintain its ductility and resist intergranular corrosion effectively, thereby eliminating the requirement for post-weld annealing treatments.

    Features of 439 Stainless Steel

    439 stainless steel contains appropriate amounts of chromium, molybdenum, titanium and other alloying elements. Chromium forms a dense and stable oxide layer (chromium oxide layer) on the stainless steel surface, preventing further oxidation reactions and metal corrosion. Although the molybdenum content in 439 stainless steel is relatively low, the addition of molybdenum can improve the corrosion resistance and high temperature resistance of stainless steel.

    439 stainless steel can be solution annealed, that is, it is heated to high temperatures (usually between 850°C and 950°C) to dissolve carbides, sulfides and other grain boundary phases in the stainless steel, and then quickly cooled. This treatment improves the corrosion resistance and mechanical properties of stainless steel.

    439 Stainless Steel Chemical Composition & Technical Data Sheet

    439 Stainless Steel Standards Comparison

    439 439 S43035 0Cr17Ti 1.4510 X3CrTi17 03Х17Т 2322 SUS 439

    439 Stainless Steel Chemical Composition

    Grade Standard Chemical Composition(%)
    C Si Mn P S Cr Ni Ti
    439 ASTM A240 ≤0.03 ≤1.00 ≤1.00 ≤0.040 ≤0.003 17.00~19.00 ≤0.50 0.30~0.50

    439 Stainless Steel Mechanical Properties

    Grade Tensile Test Hardness Test
    0.2% Y.S(Mpa) T.S(Mpa) Elongation(%) Hardness HV
    439 ≥230 ≥415 ≥20 Annealed 180

    439 Stainless Steel Finish & Application

    SUS 304 Mirror 8K Stainless Steel Coil (1)

    439 stainless steel is uniquely suited for advanced applications where its formability and resistance to high temperatures and corrosion are beneficial. It excels in manufacturing complex shapes, such as tubular manifolds and components of exhaust systems, which are subjected to temperatures exceeding the oxidation threshold of grade 409 stainless steel.

    The alloy is particularly valued in environments where enhanced resistance to wet corrosion, especially chlorides, is crucial. Its commendable weldability, surface brightness, and resistance to pitting corrosion make it a versatile material. Additionally, 439 stainless steel is noted for its excellent polishability and suitability for deep drawing processes, broadening its utility across various industrial and manufacturing applications.

    439 Stainless Steel Coil Package & Loading Details

    201 stainless steel coil packing detail
    201 stainless steel coil packing 1
    201 stainless steel coil packing 2

    Why Choose Us?


    We are the cold-rolled stainless steel coil production base in China with 200,000 tons capacity annually.

    1. Guaranteed Stock Availability: Experiencing stock shortages during crucial times can hinder your projects. Our robust inventory management ensures a consistent supply, ready to dispatch large quantities swiftly, keeping your operations smooth and uninterrupted.

    2. Comprehensive Range of Specifications: Finding the exact stainless steel coil specifications can be challenging. We offer a diverse range of specs, ensuring you find precisely what your project demands, with the assurance of our commitment to meeting your specific needs.

    3. Customized Material Processing: Custom processing needs can be demanding. Our advanced facilities provide tailored solutions, from precise dimension alterations to specific finish treatments, ensuring your requirements are met with utmost precision.

    4. Accurate Shearing Services: Precision is key in stainless steel utilization, and our expert shearing services guarantee exactness in every cut, aligning perfectly with your specifications and quality expectations.

    5. Cost-effectiveness is crucial in supplier selection. Our optimized procurement and cost-efficient processes ensure you receive not just premium-quality products but also the best prices, offering exceptional value for your investment.


    439 Stainless Steel Coil FAQ

    1. Can you provide custom 439 stainless steel?

    Absolutely, we tailor 439 stainless steel to your needs, ensuring your specifications for thickness, width, and physical properties are met.


    2. What's the delivery timeline?

    Quick delivery for trial orders within a week, while regular orders range from 7-30 days.


    3. How do you guarantee your 439 SS product quality?

    Our 439 products undergo rigorous inspections during manufacturing, cutting, and packaging to ensure the highest quality. And 439 mill test certificate is also provided.


    4. Can I get some 439 steel samples?

    We can provide 439 steel samples for you to check the quality. Sample is free and you just pay the freight.


    5. What is the difference between stainless steel 439 and 304?

    The key differences between 439 and 304L stainless steel rest in their chemical composition, corrosion resistance, thermal stability, and cost-effectiveness. 439 stainless steel, with its 16-18% chromium and 0.5-1.5% titanium content, is engineered to offer improved corrosion resistance, attributing to its elevated chromium levels. This contrasts with 304L, which typically contains 18-20% chromium and 8-10.5% nickel, enhancing its overall corrosion resistance and making it a staple in diverse applications.

    Although both grades boast commendable corrosion resistance, the heightened chromium in 439 provides it with enhanced durability in high-temperature environments, ideal for automotive exhaust systems and other applications where heat resistance is paramount. From a cost perspective, 439 stainless steel generally presents a higher investment due to its specialized composition and the benefits it delivers, particularly in terms of heat tolerance, positioning it as a premium alternative to the versatile and widely utilized 304L stainless steel.


    6. What is the difference between aisi 439 vs 409?

    The primary differences between 439 and 409 stainless steels lie in their chemical composition, corrosion resistance, and thermal capabilities. 439 stainless steel, with its 16-18% chromium content and 0.5-1.5% titanium, is engineered for enhanced corrosion resistance and is particularly adept at handling higher temperature applications. This makes it a versatile choice for environments requiring both durability and heat resistance.

    On the other hand, 409 stainless steel, typically featuring a slightly lower chromium level and lacking titanium, provides adequate corrosion and heat resistance but doesn't match the heightened performance of 439. Although both are popular in automotive exhaust systems, 439 stands out for its superior corrosion resistance, especially in high-temperature and oxidizing conditions. Consequently, while 439 may come at a higher cost, its advanced properties make it the preferred option in applications where higher corrosion resistance and temperature endurance are critical. Meanwhile, 409 remains a cost-effective solution for situations where environmental conditions are less severe and budget constraints are a significant consideration.


    7. How to choose a 439 stainless steel supplier?

    Selecting a supplier for 904L stainless steel coils involves a series of steps to ensure quality and reliability:

    Research Suppliers: Utilize online resources to identify reputable suppliers specializing in stainless steel, focusing on those with a strong industry presence and positive reviews.

    Engage with Suppliers: Contact the suppliers to discuss their 904L stainless steel coil offerings, including specifications, pricing, and availability. Consider requesting samples for quality assessment.

    Assess Credibility: Evaluate the suppliers' credibility by reviewing their business credentials, certifications, and customer feedback, ensuring they adhere to industry standards and best practices.

    Compare Quotations: Solicit and compare quotes from various suppliers, clarifying your specific needs such as quantity, specifications, and delivery details to make an informed decision.

    Verify Quality Assurance: Investigate the suppliers' quality control processes and request relevant test reports or certifications to confirm the coils meet your required standards.

    Negotiate Terms: Discuss and negotiate key terms, including pricing, delivery, and payment conditions, ensuring they align with your requirements.

    Order Placement: Finalize the purchase by confirming the order details, such as the coil specifications, quantities, and agreed terms.

    Arrange Payment: Agree on a secure payment method that suits both parties, ensuring all financial terms are clear and documented.

    Coordinate Shipping: Organize the logistics, including packaging, shipping, and customs clearance, to ensure the coils are delivered as expected.

    Inspect Upon Arrival: Upon receiving the coils, inspect the shipment for quality and accuracy, addressing any discrepancies with the supplier immediately.


    More information of 439 material, please kindly browse to our article: Comprehensive Insights On 439 Stainless Steel: Composition, Applications, And Advantages

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