420 Stainless Steel Plate
420 stainless steel plate is a type of martensitic stainless steel. Due to its high carbon content, it is known for its high hardness, high strength and excellent wear resistance. It is a typical knife-grade stainless steel, but its corrosion resistance is average.
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Product Introduction

420 Stainless Steel Plate is a higher-carbon martensitic stainless steel, essentially a harder and more wear-resistant version of the general-purpose 410. Its defining characteristic is a higher minimum chromium content (typically 12-14%) coupled with a higher carbon content (≥0.15%). This composition allows it to achieve significantly higher hardness and strength levels after heat treatment compared to 410, making it a premier choice for applications requiring excellent edge retention, abrasion resistance, and load-bearing capability under moderate corrosion conditions.

Commonly supplied in the annealed (soft) condition for machining, it is almost always heat-treated before being placed into service. While it offers better corrosion resistance than many tool steels, it is not suitable for harsh chemical or marine environments. Its primary domain is in cutting implements, wear parts, and precision mechanical components where durability is paramount.

Product parameters


Item / ParameterSpecification for 420 (UNS S42000)Notes / Significance
Key FeatureHigh-Hardness Martensitic Grade. Designed to achieve maximum hardness and wear resistance.The primary reason to choose 420 over 410.
Common DesignationsUNS S42000, AISI 420, EN 1.4021, SUS 420J1, 20Cr13EN 1.4021 is a common European designation.
Chemical Composition (Typical wt.%)C: 0.15 - 0.40 (Common ranges: 0.15-0.25% for 420, higher for 420F/420HC)Higher carbon is key to achieving higher hardness. Affects weldability and toughness.

Cr: 12.0 - 14.0Provides hardness and moderate corrosion resistance.

Si, Mn: Standard ranges-
Mechanical Properties (Condition Dependent)Annealed (Soft): Hardness: ≤ 235 HB; Suitable for machining.Baseline condition for fabrication.

Hardened & Tempered (Typical): Tensile: 1500-1900 MPa; Yield: 1200-1500 MPa; Hardness: 48-55 HRC.Exceptional hardness is the core performance metric. Properties vary with tempering temperature.
Physical PropertiesDensity: ~7.75 g/cm³Similar to other martensitic grades.

Magnetism: Ferromagnetic (Strongly Magnetic)-
Key Standards (Plate)ASTM A240/A240MThe main standard for plate. Specifies Grade 420.

ASTM A480/A480MGeneral requirements.
Common Applications• Cutlery & Blades: High-quality kitchen knives, surgical/dental instruments, industrial cutter blades.
• Molds & Tooling: Plastic injection molds (non-corrosive resins), wear plates for molding.
• Precision Parts: Shafts, bearings, valve components in mild corrosive service.
• Wear Components: Pump sleeves, scraper blades, mandrels.
Ideal where extreme hardness and moderate corrosion resistance are combined.

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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