Name: 420 Stainless Steel Coil
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420 Stainless Steel Coil

The 420 stainless steel coil is a martensitic stainless steel coil. With a higher carbon content (0.30-0.40%), it can achieve a higher hardness and wear resistance after quenching, making it a typical tool-grade stainless steel coil.

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Product Introduction

420 Stainless Steel Coil is a high-carbon martensitic stainless steel specifically engineered for applications requiring superior hardness, wear resistance, and edge retention. With carbon content ranging from 0.15% to 0.40% (significantly higher than 410's 0.08-0.15%), 420 achieves substantially higher hardness levels—up to 55 HRC after proper heat treatment. This makes it the material of choice for cutting implements, surgical instruments, and wear-resistant components where maintaining sharp edges and resisting abrasion are critical requirements.

Supplied in continuous coil form, 420 stainless steel combines enhanced hardness capability with the basic corrosion resistance characteristic of martensitic stainless steels. While its corrosion resistance is limited compared to austenitic grades, it offers significantly better performance than tool steels in mildly corrosive environments. The higher carbon content enables deeper hardening and better edge retention, positioning 420 as the premium choice for applications that demand both hardness and some corrosion resistance, bridging the gap between general-purpose stainless steels and specialized tool steels.

Product parameters

Item / Parameter	Specification for 420 Coil (UNS S42000)	Notes / Significance
Key Feature	The High-Hardness Martensitic Grade. Elevated carbon content enables exceptional hardness (up to 55 HRC) and superior edge retention for cutting and wear applications.	The standard choice for high-quality cutlery and surgical instruments requiring hardness and moderate corrosion resistance.
Common Designations	UNS S42000, AISI 420, EN 1.4021, X20Cr13, JIS SUS420	Multiple sub-grades exist: 420A (lower carbon), 420B, 420C (higher carbon).
Chemical Composition (Typical wt.%)	C: 0.15 - 0.40Cr: 12.0 - 14.0 Mn: ≤ 1.00 Si: ≤ 1.00 P: ≤ 0.040 S: ≤ 0.030	Carbon range defines capability: 0.15-0.30% for general cutlery; 0.30-0.40% for maximum hardness.
Mechanical Properties (Annealed)	Tensile Strength (Rm): ≥ 500 - 700 MPa Yield Strength (Rp0.2): ≥ 345 - 450 MPa Elongation (A): ≥ 15-20% Hardness (HB): ≤ 223	Higher strength in annealed condition compared to 410 due to higher carbon.
Mechanical Properties (Hardened & Tempered)	Tensile Strength: Up to 1600 MPa Yield Strength: Up to 1350 MPa Hardness: Up to 55 HRCElongation: Reduced to 5-10%	Maximum hardness achievable depends on carbon content and heat treatment precision.
Physical Properties	Density: 7.70 g/cm³ Melting Range: 1450 - 1510 °C Thermal Conductivity: 24.9 W/m·K (100°C) Magnetic: Strongly magnetic	Similar density to 410; always magnetic due to martensitic structure.
Heat Treatment Capability	Austenitizing: 980-1065°C Quenching: Oil or air Tempering Range: 150-370°C (for high hardness) Annealing: 735-785°C, slow cool	Critical: Must be tempered immediately after quenching to prevent cracking.
Corrosion Resistance	Moderate resistance to water, atmosphere, and mild chemicals. Not for marine or harsh chemical environments.	Better than tool steels but inferior to 304/316; requires proper passivation.
Key Standards (Coil)	ASTM A240 (Plate, Sheet, and Strip) ASTM A480 (General Requirements) AMS 5512 (Aerospace) EN 10088-2 ISO 4957 (Tool steels)	Available in various tempers; quality requirements higher than 410 due to applications.
Common Applications (from Coil)	• Cutlery: High-quality knives, scissors, razor blades • Surgical Instruments: Scalpels, forceps, dental tools • Industrial Blades: Paper cutters, textile blades, plastic cutting edges • Mold Components: Plastic injection mold cores, inserts • Mechanical Parts: Shafts, bearings, valve components requiring wear resistance • Food Processing: Cutting blades, slicers (with proper surface finish) • Defense/Military: Bayonets, combat knives	Specifically designed where hardness and edge retention are paramount.

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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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