440C Stainless Steel Plate is the highest‑carbon, highest‑hardness grade in the martensitic stainless steel family. It is engineered for applications requiring:
Maximum hardness (up to 60 HRC)
Exceptional wear resistance
High edge retention
Good corrosion resistance for a high‑carbon steel
Excellent dimensional stability after heat treatment
Because of its superior performance, 440C is widely used in premium cutting tools, precision bearings, industrial blades, molds, and high‑load mechanical components.
🟪 Product Specifications
Thickness: 2 – 80 mm
Width: 1000 – 2000 mm
Length: Custom lengths available
Standards:
ASTM A240 / A480
JIS G4304
EN 10088‑2
Heat Treatment:
Annealed
Quenched & Tempered
Hardened (58–60 HRC)
Surface Finish: No.1 / 2B / Annealed Finish
🟪 Key Features
Highest hardness among martensitic stainless steels
Excellent wear resistance and edge retention
Good corrosion resistance for high‑carbon stainless steel
Heat treatable to 58–60 HRC
Suitable for high‑precision and high‑load applications
🟪 Included Grades
440C — Highest carbon, maximum hardness
440B — Medium carbon, slightly lower hardness
440A — Lower carbon, better corrosion resistance
🟪 Mechanical Properties (Typical)
Property
440C Stainless Steel
Yield Strength
≥560 MPa
Tensile Strength
760–1000 MPa
Hardness (HRC)
58–60 (quenched & tempered)
Elongation
≥12%
Condition
Annealed / Q&T
🟪 Chemical Composition (Typical)
Element
Content (%)
C
0.95–1.20
Cr
16–18
Ni
—
Mo
≤0.75
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: Very high
Edge Retention: Excellent
🟪 Applications
High‑end knives and cutting tools
Precision bearings
Industrial blades and cutters
Molds and dies
Valve components
Mechanical parts requiring maximum hardness
Surgical tools and instruments
🟪 Why Use It
440C stainless steel plate delivers maximum hardness, superior wear resistance, and excellent edge retention, making it the top choice for high‑performance cutting tools, precision bearings, and heavy‑duty mechanical components.
🟪 Why Choose WelSteels
Full range of 440C stainless steel plates
Heat‑treatment options available
Precision cutting, machining, and surface finishing
