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Ductile Iron ASTM A536 Grade 80-55-06

Posted by admin on July 28, 2016

ASTM A536 80-55-06 (Related standards – SAE J434C D5506; ISO 1083 500-7) is a nodular iron with a mostly pearlitic - and smaller amount of ferrite - microstructure.  It has mechanical properties comparable to low alloy steels.  Ductile iron 80-55-06 is one grade in a family of many.  Chemistry requirements are not specified in the ASTM A536 standard.  Chemistry and hardness listed in this spec would be typical for a Grade 80-55-06.

For more information on ductile iron, go to our ductile iron page.

Composition

 

C

Mn

Si

Cr

Ni

Cu

Mg

Min%

3.4

 

2.35

 

 

 

0.025

Max%

3.8

0.4

2.75

0.08

0.5

0.6

0.055


Physical and Mechanical Properties

UTS

80000

TS

55000

%Elongation

6%

Hardness

>190

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)


Impact Properties
Ductile Iron impact properties are microstructure dependent.  If charpy impact testing is required for the engineering design, consider using a fully ferritic ductile iron grade with a higher % elongation.  The ISO 1083 standard specifies charpy values for low temperature applications.

The Ductile Iron Advantagethere-are-3-different-80-55-06-castings-frame-levers-and-actuator-toggles.jpg
Ductile iron can be easily cast and machined.  Ductile iron has great vibration damping and good corrosion resistance properties.  Ductile iron has a great strength to weight ratio and can be made for a much lower cost than steel.  This is in part because the gross material being used is less for casting ductile iron than for steel. 

Tip:  When considering a conversion from a fabrication to a casting, ductile iron should be used for the reasons listed above (castability, machining, close to steel strengths, and costs).

Applications
Applications include: brakes, gear boxes, frames, oil and gas parts, pumping parts, compressor parts, mining parts, winch parts, wind energy and other applications.  ASTM A536 80-55-06 is commonly used for municipal castings.

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