Comparing 316L SS to Ti Comm 1 or 2 1

[bry]

Hi,

Has anyone any opinions with regards 316L SS and Ti comm 1/ 2? Personally I believe their similar regarding mechanial properties apart from Ti lightness better corriosion resistance, does Ti comm 1 and 2 gall easily, I believe its quite a good machining material etc.


Anyway opinions are welcome

Bry

 

[AJohnson]

Hi Bry,

316SS vs. CP1 and CP2 Ti alloys. Annealed 316SS has a minimum yield strength of 30 ksi and minimum tensile strength of 75 ksi. Annealed CP1 Ti has minimum yield strength of 25 ksi and minimum tensile strength of 35 ksi. Annealed CP2 has 40 and 50 ksi minimum yield and tensile values respectively. The CP grades of Ti are generally more machinable than the 316SS, this is due to the high strain-hardening exponent inherent in all the 300 series stainless steels. Andy

 

[MJCronin]

Bry,

You haven't given us any information about your application which, of course, would be very useful....

Typically, the additional cost of Ti alloys are justified by corrosion resistance, particularly in a chlorine environment. The "light weight" is most useful to aircraft and space vehicle designers..... oh yeah, and "golf club head" people also.

Be aware that you should also investigate the "stiffness" required for you application.... Ti alloys have a Young's Modulus of about half that of Carbon or Stainless steel !!

This means that for applications like heat exchanger tubes in a "shell and tube" heat exchanger, there must be many more baffles installed to support Titanium tubes than for other alloys.

http://www.timet.com

and

http://www.titanium.net

are useful sites...

Please give us more info and Good Luck !!!


MJC

 

[Bryex]

Hi MJC,


I'm hoping to design and custom build a military style dive watch, i.e. the type used by the special forces like the SBS,Seals,Royal Marines etc. I reckon i'll use SS 316L because it feels much more substantial compared to Ti.
If you pick up a IWC AT 2000m Ti and compare it to the SS version, it feels like a Mickey Mouse watch weight wise.

Thanks for the help anyway


Bry