Straight vs. Rounded Corners Bar Stock

[Jplug7009]

What drives Mills to produce bar stock with or with out Rounded Corners, today I bought inspec material, but the corners were rounded and my finished parts will not be in spec? Anyone know why they do that? (Ti Bar)

 

[swall]

Corner configuration in square bars would be part of the material description on the purchase order. If you, as purchaser, do not designate this, the mill or warehouse will supply material on hand at their option.

 

[dgallup]

Like swall said, if you need particular conditions for your parts then you need to specify it on your purchase order. We turn a lot of parts and we always have to specify straightness or we get stuff that makes the whole building shake. Likewise we always specify that at least one end must be chamfered or the automatic bar loaders can't deal with it.

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[redpicker]

My understanding is the mills prefer Round Corner Square (RCS) over square corner because the corners are very subject to cracking and RCS is much easier to handle. I suppose if the rolling mill does not have contoured rolls, only flat rolls, then they would rather produce square cornered material. I suspect most of the RCS produced is used as reforging stock, the corner configuration is not that important and, since it is easier to handle and less susceptible to corner cracking, it is much more popular. As said above, it is best to check with the supplier if you need a particular configuration.

I hope it wasn't too expensive of a lesson. With titanium, it could be rather expensive.

rp

 

[Maui]

All of the above. You need to specify what specific geometry, surface finish, hardness, and size you are ordering. You may also need to include additional specifications such as acceptable limits on microcleanliness, the presence of impurities or trace elements (such as Pb, Cu, Ni, S, etc.), whether or not some level of magnetization is acceptable, segregations levels, end conditions, etc. The mill will not meet your expectations if you don't make it painfully clear to them what those expectations are. And if you are purchasing your material from a distributor, good luck in getting everything you want without paying a small fortune if it is anything beyond what is considered "standard requirements".

As Redpicker mentioned, RCS billets are normally used for re-rolling to insure against the formation of cracks in the corners. Since you didn't specify the size or geometry of the finished bar you are working with and what your specific requirements are, it's difficult for us to say why you have this issue.

Maui

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