HG/T 20592  法兰 WN 20(B)-100 RFF4F50 RF S=3.0c0F-25R=S=900

wn20b)-100 rfF4F50 RF S=3.0c0F-25R=S=900

wn25(a)-16RF S=3.5F S=6RF 4.0 RFf1=3 b=´=

WN80-300 RF B=66.64

WN250-150RF8�п50 RF0

wn50-40RF Sch4R6h80=52/CH208041065 2H20o

SO150-150RFh10)-

SO 350-150RF°wn100-300 rf smRF)-161.0)-10 RMRF

WN25-300RF=/0