It also is called unequal pipe cross,it is the pipe cross which the four branch ends are not in the same diameters.just like a unequal tee,the reducing cross connect the pipes of different diameters.
Since the pipe cross has four ends,when describe a reducing cross people should indicate all the four ends diameters and their positions,or else it may bring som misunderstanding.
Standard:ASME/ANSI B16.9,MSS-SP-75,DIN,EN 10253-2,JIS B2311,GOST.
Material:ASTM A234,ASTM 403,ASTM A860,DIN 17175,EN10228…Carbon steel,stainless steel,alloy steel.
Connect method:Butt welding.