Castings versus Forgings
Castings versus Forgings
(OP)
Hallo,
I'm looking references for comparison casting valves versus forging valves. Does anyone have the Links or book-reference?
thank you.
I'm looking references for comparison casting valves versus forging valves. Does anyone have the Links or book-reference?
thank you.





RE: Castings versus Forgings
Cast valves have much greater porosity than forged valves and fittings. This could be an issue in hydrogen service where the small molecules could pass through the pours. Cast valves are made by pouring molten metal into sand molds. Forged valves are beaten into shape from solid blocks of metal.
RE: Castings versus Forgings
RE: Castings versus Forgings
thank you for replied my post, actually I'm looking for papers or references "How to improve casting valve Quality" and how to avoid or minimize defects in casting valve.
PS: sendelkr, I couldnt download your file.
thanks
RE: Castings versus Forgings
RE: Castings versus Forgings
Only an analyzis of failure rate, type and probabel cause could give you a startpoint for improvement. Start with this.
If you have a too high failure rate, my tip is to check your QA-system and procedures as next step.
First when you have established that you a have procedure and a control system that works, is the time to go for metallurgy and casting processes improvement.
Questions of improving castings should be launched in other forums, and castings compared to castings.
RE: Castings versus Forgings
For example you could look at 316 stainless in a wrought form, a forged form, a sand cast form, and any one of several investment cast forms. The options are many.
RE: Castings versus Forgings
you could also invest in foundry software that models your patterns and optimizes gating.
RE: Castings versus Forgings
TYPE DEFECT MAXIMUM ALLOWABLE LEVEL
GAS POROSITY 3
SAND & SLAG INCLUSION 3
SHRINKAGE
TYPE 1 (CA) 3
TYPE 2 (CB) 3
TYPE 3 (CC) 3
TYPE 4 (CD) 3
CRACKS NONE ALLOWED
HOT TEARS NONE ALLOWED
INSERTS NONE ALLOWED
If you want higher quality you can go to level 2 on any or all of porosity, slag, and shrink
Bare in mind, when you apply radiography to a standard casting from most of the major suppliers, you double the cost.