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

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