Which is the best material for cylinderliner?

Sujet: Which is the best material for cylinderliner? Mer 29 Jan 2014 - 17:11

Hy guys,
Could someone advise me which cast is the best for making cylinderliner and which heattreatment should be done.
I know alu. cylinder with nikasil plating is much better but unfortunaly the regulation permits only cast cylinderliner.
Any help is welcome, thank's.

Sujet: Re: Which is the best material for cylinderliner? Ven 31 Jan 2014 - 14:40

All I've seen is pearlitic cast iron centrifuge.
It is created from white cast iron, this is applied to thermal treatment characterized by a long time in the oven (around about 6 days) to nearly 900°C and a slow cooling (piece covered sand).
Has characteristics between hard steel and cast iron.

Sujet: Re: Which is the best material for cylinderliner? Ven 31 Jan 2014 - 23:34

Thank you Piquer.
Where to order this fine stuff in Europe?

Vortex a écrit:: Where to order this fine stuff in Europe?

I don't guide you about this too well, I'm sorry

Sujet: Re: Which is the best material for cylinderliner? Ven 31 Oct 2014 - 8:15

Fully pearlitic as mentioned, graphite in flake form, and limit free ferrite to 5% max because it dramatically aggravates scuffing. Heat treat to HRC 35 for strength; note that scuff resistance is not heavily dependent on hardness. Mahle in Austria offers spun castings in several alloys that will work for you. I will look up one alloy to consider when I get to work in the morning.

Sujet: Re: Which is the best material for cylinderliner? Ven 31 Oct 2014 - 9:25

Brian Callahan a écrit:: Fully pearlitic as mentioned, graphite in flake form, and limit free ferrite to 5% max because it dramatically aggravates scuffing. Heat treat to HRC 35 for strength; note that scuff resistance is not heavily dependent on hardness. Mahle in Austria offers spun castings in several alloys that will work for you. I will look up one alloy to consider when I get to work in the morning.

Thank you Brian,
I will try in Austria.

Sujet: Re: Which is the best material for cylinderliner? Ven 31 Oct 2014 - 17:37

Consider Mahle D2623 or C2522. I don't have direct experience with the latter but I do with with former, in a commercial truck 2-stroke diesel application with 200 bar peak cylinder pressure.

Both of these have an iron phosphide (Fe3P) network (also known as steadite) for enhanced wear resistance to help achieve 20,000 hr durability, but I doubt you need that feature. For sure Mahle offers alloys without the phosphorous modification.

Another option to consider is Durabar G2. This is readily available in the USA but I am not sure about Europe. It comes in bars instead of tubes.

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Note that the heat treating process will make a very hard outer skin with reducing hardness toward the axis. You need to hit the desired hardness at the target bore diameter. For the same reason you will need to get a size longer than the final part and cut off both ends. The Durabar web site discusses this.