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  • 444 Stainless Steel Plate

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444 Stainless Steel Plate
444 stainless steel plate is a high-alloy ultra-pure ferritic stainless steel, regarded as the representative of economical high-performance stainless steel. It achieves superior corrosion resistance (far exceeding that of ordinary ferritic stainless steel and comparable to 316L) through extremely low carbon and nitrogen content (C+N ≤ 0.035%) and the addition of elements such as molybdenum, titanium/nickel, etc., while its cost is much lower than that of nickel-based austenitic stainless steel.
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Product Introduction

444 Stainless Steel Plate is a high-alloy, ultra-low carbon and nitrogen ferritic stainless steel engineered to deliver exceptional resistance to stress corrosion cracking (SCC) in chloride environments. As a member of the 400-series ferritic family, it is magnetic and offers significant advantages over standard austenitic grades like 304 and 316 in specific applications, particularly where thermal efficiency and cost are critical concerns.

The key to its performance lies in a "stabilized" composition: high chromium (Cr) and molybdenum (Mo) content provide excellent pitting and crevice corrosion resistance, while the addition of stabilizing elements like titanium (Ti) or niobium (Nb) to an ultra-low carbon base prevents sensitization and intergranular corrosion, even after welding. This makes 444 a robust, nickel-free, and cost-effective solution for demanding applications exposed to hot water, chlorides, and oxidizing acids.

Product parameters


Item / ParameterSpecification for 444 (UNS S44400 / EN 1.4521)Notes / Significance
Key FeatureFerritic, Stabilized, High-Mo Grade. Superior SCC resistance, excellent thermal properties, and good weldability without post-weld heat treatment.The primary choice for hot water tanks, heat exchangers, and chloride-containing environments where 304/316 may fail.
Common DesignationsUNS S44400, AISI 444, EN 1.4521, X2CrMoTi18-2, JIS SUS444, GB 019Cr19Mo2NbTiKey standards for global specification. The "stabilized" nature is often implied in the European (Ti) and Chinese (NbTi) designations.
Chemical Composition (Typical wt.%)C: ≤ 0.025N: ≤ 0.035Cr: 17.0 - 19.5Mo: 1.75 - 2.50Ti/Nb: Added for stabilization (e.g., ≥0.20+4(C+N))Ultra-low C+N prevents chromium carbide formation. High Mo provides chloride resistance. Ti/Nb stabilizes the alloy against sensitization.
Mechanical Properties (Annealed Plate)Yield Strength (Rp0.2): ≥ 245 - 275 MPaTensile Strength (Rm): ≥ 410 - 480 MPaElongation (A): ≥ 20 - 30%Higher yield strength than 304/316L, offering potential for weight savings in tank and vessel design.
Physical PropertiesDensity: 7.75 g/cm³Thermal Conductivity: 26.8 W/m·K (at 100°C)Coeff. of Thermal Expansion: 11.0 x10⁻⁶/KMagnetism: Ferromagnetic (Yes)Higher thermal conductivity and lower thermal expansion than austenitic steels lead to better heat transfer efficiency and reduced thermal distortion.
Key Corrosion PerformanceStress Corrosion Cracking (SCC): Excellent. No cracking after 48h in boiling MgCl₂ test, vastly outperforming 304 (2.5h) and 316L (9.8h).
Pitting Resistance: Comparable to 316L, superior to 304.
Intergranular Corrosion: Resistant, even in the welded condition.		This data is its primary competitive advantage. It clearly quantifies why 444 is chosen over 316L for hot chloride service.

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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