Galling - Stellite 6 self mated pair
Galling - Stellite 6 self mated pair
(OP)
The usual loaded pin galling pressure test runs at relatively low surface velocities. I am told by one of our valve suppliers that they had extensive difficulties with self-mated Stellite 6 in water when the operating speed of the valve was increased to slightly over 1 ft/sec. Below this it was OK.
This velocity doesn't seem particularly fast to me and I have always regarded Stellite 6 on Stellite 6 as an excellent anti-galling pair. None of the local metalurgists has heard of velocity being a factor in galling; however the valve man says it was definitely confirmed by extensive trials with different material pairs and velocities.
Does anyone else have any experience of surface velocity being an important variable in resisting galling in Stellite or other materials.
This velocity doesn't seem particularly fast to me and I have always regarded Stellite 6 on Stellite 6 as an excellent anti-galling pair. None of the local metalurgists has heard of velocity being a factor in galling; however the valve man says it was definitely confirmed by extensive trials with different material pairs and velocities.
Does anyone else have any experience of surface velocity being an important variable in resisting galling in Stellite or other materials.





RE: Galling - Stellite 6 self mated pair
Would be interested in other experiences.
RE: Galling - Stellite 6 self mated pair
RE: Galling - Stellite 6 self mated pair
The main parameters are or may be: "specific pressure onto the surfaces,velocity,materials,temperature"; the function has a certain complexity and you have to study more dedicated tests in order to get appropriate evaluations.
You have to prepare a matrix of various parameters and to define the importance. Consequently you have to define some tipical situations by an effective simulations.
RE: Galling - Stellite 6 self mated pair
DowneastTech
Mechanical Engineer
Magnus R & D, Cypress, TX