439 Stainless Steel Plate
439 stainless steel is an improved ferritic stainless steel, made by significantly reducing the carbon and nitrogen content in 430 stainless steel and adding stabilizing elements such as titanium (Ti) and niobium (Nb). Its core positioning is as an economical alternative to 304 stainless steel, mainly used in civil applications that require higher corrosion resistance, formability, and weldability.
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Product Introduction

439 Stainless Steel Plate is a titanium-stabilized ferritic stainless steel, representing an enhanced and modernized version of the classic Type 430. It features significantly lower carbon and nitrogen content alongside the deliberate addition of stabilizing elements (primarily Titanium) to overcome the limitations of standard ferritic grades .

This "stabilized" chemistry delivers exceptional resistance to intergranular corrosion, making it highly resistant to "weld decay" and ensuring the integrity of welded structures without the need for post-weld heat treatment . With corrosion resistance comparable to Type 304 in many environments, combined with favorable physical properties like high thermal conductivity and low thermal expansion, it offers a cost-effective, nickel-free alternative for demanding applications . Its excellent weldability, formability, and surface finish have made it the preferred material for high-quality architectural and automotive components, steadily replacing 304 in these areas .

Product parameters


Item / ParameterSpecification for 439 (UNS S43035)Notes / Significance
Key FeatureStabilized Ferritic Grade. Excellent intergranular corrosion resistance, good formability, and weldability. A cost-effective, nickel-free alternative to 304.The primary reason to choose 439 over 430 or for replacing 304 in suitable applications.
Common DesignationsUNS S43035, ASTM 439, EN 1.4510, X6CrTi17, GB/T 022Cr17Ti or 00Cr18TiKey standards for global specification.
Chemical Composition (Typical wt.%)C: ≤ 0.030 Cr: 17.0 - 19.0 Ti: ≥0.20 + 4(C+N), ≤1.10 Ni: ≤ 0.5 N: ≤ 0.03Ultra-low C+N and Ti stabilization are key to its performance, preventing sensitization and weld decay.
Mechanical Properties (Annealed Plate)Tensile Strength (Rm): ≥ 415 - 450 MPa Yield Strength (Rp0.2): ≥ 205 - 240 MPa Elongation (A): ≥ 22 - 30%Offers good strength with adequate ductility for forming.
Physical PropertiesDensity: ~7.70 - 7.75 g/cm³ Thermal Conductivity: ~24.2 - 26.4 W/(m·K) (at 100°C) Thermal Expansion (20-100°C): ~10.4 - 10.5 x10⁻⁶/K Magnetism: Ferromagnetic (Magnetic)Higher thermal conductivity and lower thermal expansion than austenitic steels (like 304) improve heat transfer efficiency and dimensional stability under thermal cycling.

Surface selection

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Packaging and transportation

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FACTORY SHOW

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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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