???? ????? ?????? ????? ??????? ASTM A216 WCB ?????? ???????

???? ????? ASTM A216 WCB? ?? ???? ??????????? ??? ?????? ???????? ????????? ?? ???? ????? ???? ?????? ???? ??????? ????? ?? ?????????. ??? ?????? ?????? ????? ?? ????? ?????? ???? ?????? ASTM A216 WCB? ????? ??????? ?????? ?????? ?????? ?????? ??? ????? ??????? ????????? ?? ????? ????????? ??? ????? ?????? ??????????????? ?????? ??????. ????? ?????? ????? ???? ???????? ??? ???? ????? ??? ????? ?? ???? ???????. ???? ????? ??????? ?????? ???????? ????? ?????? ??????? ?????? ?????? ?? ???? ???????? ?????? ???????? ?????? ?? ????? ????? ??????. ???? ??? ?????? ?????? ASTM A216 WCB ?? ???? ??????????? ??? ?????? ???????? ????????? ????? ??????? ???? ????? ??????? ?? ???????. ???? ?????? ??????? ?????????? ????? ????????? ???? ???? ????? ??? ??????? ??????? ??? ???? ?????? ????? ?????? ?????? ??????? ???? ??? ????? ??? ?????? ??????? ?? ?????? ???????? ???????? ?? ????????? ??? ???? ????? ASTM A216 WCB ?? ???? Shijiazhuang Deye Piping Industry Co.? Ltd. ?? ???? ?????? ??????????