Alternative to 6061-T6 for casting 1

[MOEMS]

I have a product that was originally designed as a welded fabrication using 6061-T6. We are now looking at producing larger volumes and would like to consider a casting process. I've been told that 6061 doesn't pour very well. Can someone suggest an alternative aluminium that will have similar structural properties and is more suited to casting?

 

[CoryPad]

356 (or one of its variants) or 357.

 

[hydtools]

What Cory said, 356. You can temper to T6 condition. Sand cast, investment cast. Machines nicely.

Ted

 

[CastMetal]

If this is intended for a marine environment (as your discipline suggests) Alloy 415 has much better corrosion characteristics than 356 though it does sacrifice some additional strength.
Also 6061 "can" be cast but only in very simplistic geometries with higher tendency for significant porosity. It will cause a lot of headaches and should be avoided but in certain scenarios it can be a valid option.

Comprehension is not understanding. Understanding is not wisdom. And it is wisdom that gives us the ability to apply what we know, to our real world situations

 

[CastMetal]

Error and an omission, I meant 413 (not 415) and it is a diecasting (high pressure casting) alloy.

Comprehension is not understanding. Understanding is not wisdom. And it is wisdom that gives us the ability to apply what we know, to our real world situations

 

[MOEMS]

Thanks CoryPad, Hydtools and CastMetal. Appreciate the info.This application isn't actually for the marine environment this time, but I will look into 413 for other applications. I think 356 or A356 will be the way to go. Seems to have better fluidity for casting.
Thanks again.

 

[swall]

You are at the point where you should talk to a casting supplier and have them validate your choice of 356 alloy.

 

[Metalhead97]

MOEMS,

How much ductility do you need? You may also want to consider a TiB grain refiner and a Si-eutectic modifier using Sr.

Metalhead

 

[CastMetal]

Though Metalhead's suggestions can improve physical properties significantly, many casting operations order their 356/380 ect. with the grain modifying elements they prefer. Specifying specific modifiers can considerably increase cost (unless your quantities are very substantial). This is something best left for discussion with the casting supplier.

Comprehension is not understanding. Understanding is not wisdom. And it is wisdom that gives us the ability to apply what we know, to our real world situations