420 Stainless Steel Coil | High‑Hardness Martensitic Stainless Steel | Knife‑Grade & Wear‑Resistant Steel

🟧 Product Overview

420 stainless steel is a high‑hardness martensitic stainless steel widely used in cutting tools and wear‑resistant applications. It offers:

• Very high hardness after quenching
• Excellent wear resistance
• Good mechanical strength
• Moderate corrosion resistance
• Magnetic properties
• Suitable for precision machining and heat treatment

Because of its high carbon content, 420 is the standard material for knives, scissors, surgical tools, and industrial blades.

🟧 Key Features

• Can reach high hardness levels (HRC 48–52)
• Excellent wear resistance
• Good edge retention for cutting tools
• Heat‑treatable for enhanced performance
• Magnetic martensitic structure
• Cost‑effective compared to high‑end tool steels

🟧 Standards

• ASTM A240 / A480
• JIS G4304 / G4305 (SUS420J1 / SUS420J2)
• EN 10088‑2 (1.4021 / 1.4031 / 1.4034)
• GB/T 3280

🟧 Chemical Composition (Typical)

Element	420 (%)
C	0.16–0.25
Cr	12.0–14.0
Ni	≤0.75
Mn	≤1.0
Si	≤1.0
S	≤0.03
Fe	Balance

Note: The higher carbon content is the key factor behind 420’s excellent hardness and wear resistance.

🟧 Mechanical Properties (Typical)

Property	Value
Yield Strength	≥275 MPa
Tensile Strength	≥700 MPa
Hardness (HRC)	48–52 (after heat treatment)

🟧 Product Specifications

Thickness

• 0.25 – 6.0 mm

Width

• 600 – 2000 mm

Surface Finishes

• 2B
• BA
• No.1
• No.4
• HL

🟧 Applications

Cutting Tools

• Knives
• Scissors
• Industrial blades
• Cutting tools

Medical & Precision Tools

• Surgical instruments
• Dental tools
• Precision mechanical parts

Wear‑Resistant Components

• Shafts
• Bearings (low‑load)
• Wear plates

🟧 Why Choose Jaron Steel

• Professional supply of 420 stainless steel coil
• High‑hardness, wear‑resistant martensitic grade
• Stable heat‑treatable performance
• SGS / BV inspection available
• Export‑grade seaworthy packaging