420 Stainless Steel Plate is a high‑carbon martensitic stainless steel designed for applications requiring:
High hardness after heat treatment
Excellent wear resistance
Good corrosion resistance in mild environments
High polishability for mirror‑finish applications
420 is widely used in cutlery, surgical tools, industrial blades, pump shafts, and precision mechanical parts.
Compared with 410, 420 offers higher hardness and better edge retention, making it a preferred material for cutting and wear‑resistant applications.
🟪 Product Specifications
Thickness: 2 – 80 mm
Width: 1000 – 2000 mm
Length: Custom lengths available
Standards:
ASTM A240 / A480
JIS G4304 (420J2)
EN 10088‑2
Heat Treatment:
Annealed
Quenched & Tempered
Hardened (48–52 HRC)
Surface Finish: No.1 / 2B / Annealed Finish
🟪 Key Features
High hardness after heat treatment
Excellent wear resistance
Good polishability (mirror finish possible)
Moderate corrosion resistance
Suitable for cutting, tooling, and mechanical applications
🟪 Included Grades
420 — Standard high‑carbon martensitic stainless steel
420J2 — Higher corrosion resistance, widely used in cutlery and surgical tools
🟪 Mechanical Properties (Typical)
Property
420 Stainless Steel
Yield Strength
≥345 MPa
Tensile Strength
650–850 MPa
Hardness (HRC)
48–52 (quenched & tempered)
Elongation
≥18%
Condition
Annealed / Q&T
🟪 Chemical Composition (Typical)
Element
Content (%)
C
0.16–0.40
Cr
12–14
Ni
—
Mn
≤1.0
Si
≤1.0
P
≤0.040
S
≤0.030
🟪 Physical Properties (General)
Density: 7.75 g/cm³
Magnetism: Magnetic
Heat Treatable: Yes
Wear Resistance: High
🟪 Applications
Cutting tools and industrial blades
Surgical instruments
Scissors and knives
Pump shafts and valve components
Mechanical parts requiring high hardness
Precision tools and wear‑resistant components
🟪 Why Use It
420 stainless steel plate is ideal for applications requiring high hardness, excellent wear resistance, and good polishability. Its ability to reach 48–52 HRC makes it a preferred material for cutting tools, surgical instruments, and high‑wear mechanical components.
