WB36 was (is?) the material desination (steel brand name) of company Thyssen Schulte Werkstoffe GMBH(Dusseldorf in Germany).
It's a high temp. constructional steel for Boiler drums, Pressure vessels, corugated tube (temp max. 500 degree =\Celsius).
Material also known as 15NiCuMoNb5 (1.6368)...
We apply a minimum angle of 8 degree, a maximum of 30 degree and an preferred angle of 14 degree. Design basis: ASME piping code and ANSI/ASME fitting standards
Non-matching 6BX flange hub OD and standard Pipe OD:
For standardization purposes I tried to collect basic design rules for this problem.
Info can be found in:
-Mayar piping handbook, 6th ed. Mc Graw&Hill
-API RP14E
-ASME B31.3
-ASME B16.25
-ASME B16.5
-API 6A
Info has'nt been studied yet...