GGG120 1

[SaeidNorouzi]

Dear All,
I want to cast a crank shaft using "GGG120". I need information regarding casting and heat treatment of this alloy.
Thank you in advance,
Saeid

 

[arunmrao]

GGG120 is a bainitic grade ductile iron,having T.S of 1200MPA,Yield strength(0.2% offset) 950MPA , % Elongation 2% min and Hardness 330-390 BHN.

You may refer to the link below for heat treatment cycles.

Heat treater's guide: practices and procedures for irons and steels By Harry Chandler

http://books.google.co.in/books?id=...&resnum=5&ved=0CDUQ6AEwBA#v=onepage&q&f=false

 

[SaeidNorouzi]

Thank you Arunmrao,
What is its chemical composition?

 

[arunmrao]

http://www.ductile.org/didata/Section4/4intro.htm

An extract from the link above is reproduced.

In many cases, the composition of an ADI casting differs little from that of a conventional Ductile Iron casting. When selecting the composition, and hence the raw materials, for both conventional Ductile Iron and ADI, consideration should be given first to limiting elements which adversely affect casting quality through the production of non-spheroidal graphite, or the formation of carbides and inclusions, or the promotion of shrinkage. The second consideration is the control of carbon, silicon and the major alloying elements (See Table 4.7) that control the hardenability of the iron and the properties of the transformed microstructure. When determining the alloying requirements both the section size and type and the severity (or speed) of the austempering quench must be considered.

For a typical salt quench with agitation section sizes up to about 3/8 inch (10 mm) can be successfully through hardened without pearlite with even unalloyed Ductile Iron. For a highly agitated austemper quench with water saturation section sizes of up to ¾ inch (20 mm) can be through hardened with no additional alloying. For castings of heavier section size selective alloying is required to through harden the parts and avoid pearlite in the heat treated microstructure.