440C Stainless Steel Plate
440C stainless steel plate is a high-carbon high-chromium martensitic stainless steel, renowned for its extremely high hardness and outstanding wear resistance. It is one of the hardest grades among all stainless and heat-resistant steels. It is mainly applied in fields where extreme requirements are imposed on hardness and wear resistance.
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Product Introduction

440C Stainless Steel Plate represents the pinnacle of hardness and wear resistance among the standard martensitic stainless steel grades. With a very high carbon content (0.95-1.20%) and elevated chromium, it is designed to achieve maximum hardness, exceptional edge retention, and outstanding abrasion resistance after proper heat treatment. This alloy is classified as a "hardened bearing steel" and is the go-to material for applications where extreme durability under high load and moderate corrosion conditions is paramount.

While it offers the stainless characteristic of passivation in mild environments, its primary identity is that of a superior wear-resistant and cutting material. It is almost exclusively supplied in the spheroidized annealed condition to facilitate machining, followed by customer-specific hardening. Its use is specialized, targeting high-performance components in demanding mechanical, aerospace, and precision industries.

Product parameters


Item / ParameterSpecification for 440C (UNS S44004)Notes / Significance
Key FeatureUltra-High Carbon Martensitic Grade. Engineered for maximum achievable hardness and wear resistance among common stainless grades.The definitive choice when hardness is the top priority.
Common DesignationsUNS S44004, AISI 440C, EN 1.4125, SUS 440C, 102Cr17MoEN 1.4125 is a common European designation. "C" denotes the highest carbon variant of the 440 series (A, B, C).
Chemical Composition (Typical wt.%)C: 0.95 - 1.20Extremely high carbon is the foundation of its supreme hardness. Directly impacts toughness and weldability.

Cr: 16.0 - 18.0High chromium enables hardening and provides stainless properties. Also forms hard chromium carbides.

Mo: 0.40 - 0.65Adds strength, hardenability, and refines grain structure.
Mechanical Properties (Condition Dependent)Annealed (Soft): Hardness: ≤ 269 HBThe supplied condition for all machining operations.

Hardened & Tempered (Typical): Hardness: 56 - 62 HRC; Compressive Strength: Very High.Legendary hardness range. The core performance metric. Tensile strength can exceed 1900 MPa.
Physical PropertiesDensity: ~7.70 g/cm³-

Magnetism: Ferromagnetic (Strongly Magnetic)-
Key StandardsASTM A240/A240M (Lists Grade 440C)Primary plate specification standard.

ASTM A480/A480MGeneral requirements.

AMS 5630 (Aerospace Material Spec)Highlights its use in critical aerospace bearings and parts.
Common Applications• High-Performance Bearings: Ball and roller bearings for aerospace, precision instruments.
• Cutting Tools & Blades: High-end knives, surgical blades, slitter blades, gauges.
• Valve Components: Seats, stems, and parts in fuel and hydraulic systems.
• Wear Parts: Nozzles, wear plates, mandrels, and fixtures subject to severe abrasion.
The material of choice for the most demanding wear and cutting applications.

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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