GB/T 12459  弯头 DN 20-Sch80S90EL¦3F1M-500r55 KRF0615r

DN 20-Sch80S 90EL¦3F1M-500r55 KRF0615r

TPB-2=700-3

2 M 350-1.620δ1=12440 RF16 M0 MrfRF50r6J6025 M S=4s

so600(b)-25 fm/80SH4)-40 f

pl15(a)-16 RF6rf0b41=Sch bbF3rf

PL80(B)-16 RF1密纹/50r8�

WN50-300 RF Sch80D=700 d=608RF

WN15(A)-16rfch4sR

SO 15(B)