40Cr
Alloy structural steel for shafts, gears, bolts, and general mechanical parts.
40Cr is a widely used alloy structural steel with good hardenability and strength after heat treatment.
Quote Preparation
Send a steel bar requirement for review.
Share the practical details first so material, delivery condition, processing route, inspection needs, and destination can be reviewed together.
- Grade or equivalent standard
- Diameter, length, and quantity
- Delivery condition and surface condition
- Application, inspection requirements, and destination
Buyer Details
Key supply details before quotation.
Review the main grade, application, processing, and inspection points first. Open the detailed notes only when deeper context is useful.
40Cr
Key point
Good hardenability and stable strength after heat treatment.
Commonly used for mechanical parts, transmission shafts, and gear components.
Product Summary
Balanced alloy steel for common industrial parts.
The grade suits customers who need a practical structural steel with predictable heat-treatment response and broad machining use.
Introduction
40Cr is a widely used alloy structural steel with good hardenability and strength after heat treatment. It is commonly used for shafts, gears, and bolts.
Equivalent grades
GB
40Cr
DIN
41Cr4
JIS
SCr440
Chemical composition
C
Detailed source notes 38 more points
0.37 - 0.44
Si
0.17 - 0.37
Mn
0.50 - 0.80
Cr
0.80 - 1.10
Mechanical properties
Tensile strength
≥ 800 MPa
Yield strength
≥ 540 MPa
Specifications
Diameter
20 - 300 mm
Length
3 - 12 m
Condition
Annealed / QT
Transmission shafts
Gear components
Mechanical parts
Automotive components
Manufacturing options
Hot rolled or forged supply
Heat-treatment support
Rough machining and finish machining
Surface treatment on request
Inspection points
Chemical check
Mechanical testing
Ultrasonic testing available
Dimensional inspection
Inquiry
Need a quote for 40Cr bar stock?
Send your diameter, length, and quantity to get a fast response.
Contact us
Next product