Name: 420 Stainless Steel Bar
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420 Stainless Steel Bar

420 stainless steel bars are martensitic stainless steel bars. With a higher carbon content (0.30-0.40%), they can achieve a higher hardness and wear resistance after quenching, making them a typical material for cutting tools.

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Product Introduction

420 Stainless Steel Bar is a high-carbon martensitic stainless steel specifically engineered for applications requiring superior hardness, wear resistance, and edge retention in bar stock form. 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.

Available in rounds, squares, flats, and hexagons, 420 stainless steel bar 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 in bar form, bridging the gap between general-purpose stainless steels and specialized tool steels.

Product parameters

Item / Parameter	Specification for 420 Bar	Notes / Significance
Key Feature	The High-Hardness Martensitic Bar Stock. Elevated carbon content enables exceptional hardness (up to 55 HRC) and superior wear/edge retention for cutting and wear applications.	The standard choice for high-quality cutlery and surgical instruments requiring maximum hardness and wear resistance.
Common Designations	UNS S42000 AISI 420 ASTM A276 (Stainless Steel Bars) 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: ≥ 500 MPa Yield Strength: ≥ 345 MPa Elongation: ≥ 15% Hardness: ≤ 223 HB Machinability: 55% of B1112 steel	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% Machinability (hardened): Very poor	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) 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.
Available Forms	Rounds: 6mm - 200mm diameter Squares: 6mm - 100mm Flats: Various thicknesses/widths Hexagons: 6mm - 50mm Billets: For forging applications	Generally available in smaller sizes suitable for tool and cutlery manufacturing.
Surface Conditions	Hot Finished: Black bar Cold Finished: Bright bar Centerless Ground: Precision ground Polished: For cutlery applications Peeled: Improved surface for machining	Various finishes available; polished finishes common for cutlery applications.
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.
Machining Characteristics	• Machined in annealed condition• Heat treat after machining• Higher tool wear than 410 • Good chip control• Requires sharp tools	Typically machined soft, then hardened; hardened material is difficult to machine.
Key Standards	ASTM A276 420: Stainless Steel Bars ASTM A484: General Requirements EN 10088-3: Stainless Steel Bars JIS G4303: Stainless Steel Bars AMS 5616 (Aerospace)	Available in various hardness conditions as specified by customer requirements.
Common Applications	• Cutlery Manufacturing: Knife blades, scissors, razor blades, cutting tools • Surgical Instruments: Scalpels, forceps, dental instruments, surgical tools • Industrial Blades: Paper cutters, textile blades, plastic cutting blades • Mold Components: Plastic injection mold cores, inserts, ejector pins • Mechanical Parts: Shafts, bearings, valve components requiring wear resistance • Food Processing: Cutting blades, slicers, food preparation tools • Defense/Military: Bayonets, combat knives, specialized tools	Specifically designed where hardness and edge retention are paramount in bar form.

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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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