CRN (Canadian Registration Number) for Cat C valves that are B16.34 design but are made from a material that is not listed in B16.34.
1. Compare your material to an existing code listed material similar but lower yield and tensile strength and then apply the ratings for that weaker material to your valve (in other words, assign it to the lower materials group). Note: you would need to consider the material properties at the required design temperature. 
2. Complete detailed calculations on the pressure capacity of the ball valve body (based on body wall thickness), and any other aspects of the valve (including bolted bonnets and flanges) using appropriate design rules or FEA.  Appendix B of ASME B16.34 would provide some guidance on how the ratings in the Standard were derived for the listed materials if you want to do calculations.
In order to entirely bypass ABSA approval, you may want to simply get the material added to B16.34/B16.5.  I've done this in the past when I knew that an unlisted material was going to be needed on a regular basis.  It can take a little while, I think it took me about 18 months, but in the end it will make life easier.

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