Casting HSLA parts
Casting HSLA parts
Asteryx,any reason for considering the casting route? What is the part you intend to cast?
Will the foundry be able to handle the small batches? As in the case of plates,there is no grain refining or strengthening mechanism due to mechanical working for castings. For cast parts,it is essentially, grain refinement and microstructure control ( by heat treatment) that will enable you get the properties. I am sure you are aware of these.
Casting parts are likely to have internal casting defects,you must be able to identify and locate these defects . Determining the critical flaw size is important for your application alternately, a steel has to be chosen that has a large critical flaw size,so that it can be measured more accurately.
Will the foundry be able to handle the small batches? As in the case of plates,there is no grain refining or strengthening mechanism due to mechanical working for castings. For cast parts,it is essentially, grain refinement and microstructure control ( by heat treatment) that will enable you get the properties. I am sure you are aware of these.
Casting parts are likely to have internal casting defects,you must be able to identify and locate these defects . Determining the critical flaw size is important for your application alternately, a steel has to be chosen that has a large critical flaw size,so that it can be measured more accurately.
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"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year





RE: Casting HSLA parts
The incentive is just design and weight efficiency; we want to design in geometry that does much more for strength and performance of the part than we can do with plate.
The competition does something similar with a good track record, although we're trying for slightly higher mechanical properties.
We've been casting ~G50 parts and are happy, and initial prototypes to that grade are good; we're just unfamiliar with casting the higher mechanical properties and what's going to be involved in getting there.
The parts range from about 2 kg up to 30 kg, and we will go much higher if feasible - up to about 150 kg. Lost wax investment for the small ones and sand for the big guys.
RE: Casting HSLA parts
Will the foundry accept to do small batches or is the alloy regularly being processed by the foundry.
_____________________________________
"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year
RE: Casting HSLA parts
RE: Casting HSLA parts
RE: Casting HSLA parts
RE: Casting HSLA parts
The requirement for Charpy CVN average is ≥ 34 J at -20 deg C.
Operating temps are as above no lower than freezing; will be used underwater.
Microalloy is on the notepad here too, but I understand elongation will suffer. Bending is a preferable failure mode for us than breaking... even if it has to be at a lower yield.
Swall we will talk to the foundries but just wanted to know what we're talking about to a limited degree before doing so.
RE: Casting HSLA parts
RE: Casting HSLA parts
In any event, the weldment should be stress relieved before hot dip to avoid cracking from molten zinc.