What metals are the plunger and cylinder made of?

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Sergey2016-01-13 20:21:05

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Sergey, 2016-01-13 20:21:05

In general, you need a plunger pump, do not buy a vario, I will do it myself faster because I have tools and hands. What metals are the plunger and cylinder made of? Maximum pressure 25MPa. Butter.
The plunger cylinder is ready, with a mirror. Piston issue. Aluminum or bronze?

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Vasily, 2016-01-13
@r3l0c

in conventional plungers for water at 200 atmospheres, martensitic stainless steel - hardened and st40
aluminum cylinder never use in a friction pair this is the most evil abrasive - even chrome rubs