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  ASTM A536 grade 65-45-12 Ductile Cast Iron  
 

ASTM A536 grade 65-45-12 is one grade of ductile iron for USA, it is equal to China QT450-10, ISO 450-10, EN-GJS-450-10, Japan FCD450, UK 420-12 and Italy GS400-12.

65-45-12 Ductile Iron contains nodular graphite in a matrix of ferrite with small amounts of pearlite. The ferritic structure gives excellent machinability with good surface finishes along with optimal impact strengths, fatigue properties, electrical conductivity and high magnetic permeability.

Chemistry requirements are not specified in the ASTM A536 standard. Chemistry and hardness listed below would be typical for a Grade 65-45-12.


Chemical Composition (%) for ASTM A536 65-45-12 ductile cast iron

Carbon

Silicon

Manganese

Sulfur

Phosphorus

3.50-3.90

2.25-3.00

0.15-0.35

0.025 max

0.05 max

Physical and Mechanical Properties of ASTM A536 65-45-12 ductile cast iron


Tensile strength psi (min)

65,000

Tensile strength Mpa (min)

448

Yield strength psi (min)

45,000

Yield strength Mpa (min)

310

Elongation in 2 in, or 50 mm, min.

12%

Density lb/in3 (g/cm3)

0.256(7.1)

Thermal Conductivity Btu/hr·ft·F (W/m·K)

250(36) for Ferritic grades, will change with an increase in pearlite, approx. 20% less

Specific Heat at 70F Btu/lb·F (J/Kg·k)

0.110(461)

Coefficient of Thermal Expansion Ɛ/F(Ɛ/C)X106 average between 68-212F

6.4 (11.5)

Melting Temperature (F)

2100 F

Compressive Strength Ksi (MPa)

429 (2960)

Hardness Properties of ASTM A536 65-45-12 ductile cast iron


Hardness Properties of ASTM A536 65-45-12

Size Range

BHN

Inches

Millimeters

Min

Max

1.000-2.000

25-51

156

217

2.001-3.000

51-76

153

207

3.001-6.000

76-152

143

207

6.001-20.000

152-508

131

207

Heat Treat Response

65-45-12 Ductile Iron can be oil quench hardened from 1600° F (885° C) to Rockwell C 50 minimum on the outside of the bar. Hardness in the core will be less than the hardness on the outside surfaces. This grade also responds well to surface hardening methods such as flame or induction heat treating. It is well suited for austempering because of the low residual alloy content, and the highly ferritic matrix provides predictable growth with minimal heat distortion.

Typical Applications of ASTM A536 65-45-12 ductile cast iron

Automotive:

Gears

Fluid Power:

Cylinder blocks, End Caps, Gear Rack Housings, Gerotors,
Glands, Manifolds, Pistons, Rotors, Valves

Glass Mold:

Bank Molds, Plungers

Machinery:

Bushings, Chuck Bodies, Die Blocks, Flywheels, Gears,
Housings, Journals, Pulleys, Rams, Rotary Tables, Side
Frames, Spindle Housings, Tie Rod Nuts

Miscellaneous:

Plunger Pin

Power Transmission:

Coupling Hubs, Gears, Pulleys, Sprockets

Pump & Compressor:

Gears, Housings, Pistons, Rotary Screws, Rotors

Transportation:

Coupling Hubs, Gears, Pulleys, Rail Spacers, Sprockets

 

 

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