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Andrew Millar	10/06/2013 19:10:38
11 forum posts	Hi al.l made piston rings for my lynx engine out of cast iron ggg40 after heating to cherry red and letting cool the rings are still very flexible .Any rings i worked with in the past have been very brittle. Any advice will be apecciated
JasonB	10/06/2013 19:22:19
25215 forum posts 3105 photos 1 articles	Thats SG iron which is a ductile iron, often used for castings where you don't want a brittle part like crankshafts and axles. I think the Din number you want is GC25 J Edited By JasonB on 10/06/2013 19:27:20
Ian S C	11/06/2013 13:36:27
7468 forum posts 230 photos	The last rings I made , were made from an old brake disc, after heat treatment they were more brittle than SG iron, but more springy, previous set of rings were made of SG iron, not too sure of them, but they are working. Ian S C
Andrew Millar	11/06/2013 18:56:17
11 forum posts	Thanks gays for all the help will get some S G iron and make some more rings and go from there
JasonB	11/06/2013 19:04:55
25215 forum posts 3105 photos 1 articles	SG iron is what you have already used that is why they are flexing and not brittle, the ggg in the code indicates that you are using Spheroidal Graphite (SG) Iron J
Andrew Millar	11/06/2013 20:12:43
11 forum posts	Thank Moderator can get GR 17 cast iron from the people i get my material from ,will give that a go. Did try oil quench them in oil- this helped
JasonB	11/06/2013 20:17:55
25215 forum posts 3105 photos 1 articles	Thats will be ideal, its what I use. J
Andrew Millar	11/06/2013 20:30:14
11 forum posts	Thanks for your help will let you know how i get on

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