Morgan Bronze Products, Inc. - Item # B40 3.750, Class 40 Gray Iron Round Bar
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Item # B40 3.750 Class 40 Gray Iron Round Bar
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Product Image - Class 40 Gray Iron Round Bar

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Class 40 Gray Iron Round Bar
The highest strength, hardness, resistance to wear and heat treat response for an unalloyed gray iron. Machinability, noise and vibration damping is Excellent to Very Good.


Unit of Measure: Imperial | Metric | Both 

Specifications · Characteristics

Specifications

Type

Round Bar

Material

Class 40 Gray Iron

Diameter

3 3/4 Inch

Stock Allow

0.125 Inch

Min. Cast O.D.

3.837 Inch

Max. Cast O.D.

3.913 Inch

Bar Length

6 ft

Weight Per Inch

3.0657 lbs

Weight Per Bar

221 lbs

Characteristics

Standard

ASTM A48, Class 40, Meehanite GC275 (GC40)

Condition

As Cast (Rectangles and Squares)
As Cast and Cold Finished (Rounds)

Chemistry

Subordinate to Mechanical Properties
Typical Ranges:

Element Typical %
Carbon 2.9 - 3.65
Silicon 1.8 - 2.9
Manganese 0.5 - 0.7
Sulphur 0.1 max
Phosphorous 0.15 max
Balance Residual

Tensile Strength

 Question? 		27000 to 40000 psi

Compressive Strength

Typically 3 to 4 times tensile strength

Min. Brinell Hardness

 Question? 		197

Max. Brinell Hardness

 Question? 		269

Micro Structure

Highly Pearlitic, with predominantly type D, size 6-8 graphite in the rim of the bar with some amount of ferrite, and predominantly Type VII, A, size 4-6 graphite in the core of the bar. The matrix will be highly pearlitic in the core. Chill carbides will be less then 5% well dispersed at (100x magnification).

Heat Treat Response

Class 40 Gray Iron can be hardened by conventional heat treat methods to Rc 50 minimum. Hardness will decline to below Rc 50 beginning at approximately 0.200" Deep.

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· Micro Structure

· Micro Structure

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Morgan Bronze Products, Inc.  •  367 Hollow Hill Dr., Wauconda, IL 60084  •  Ph. 800-445-9970  •  847-526-6000  •  Fx. 847-526-3960  •  info@morganbronze.com