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2024-12-20

??? ????? ?? 4140 ????? ?? ??? ??? ???: ????? ?? ??? ???? ???? ???? ????? ?? ??? ?? ???? ??? ?????? ????

4140 seamless tubing is ??????? ???????????????? ????? ??? ????????????? ???? ??? ???????? ????? ???? ???? ???? ??? ????? ???? ???? ??????? "4140" ???? ???? ?????????? ??? ?? chromium, molybdenum and carbab, ???? ???? ??? ??????? ???? ??? ??? ???. ????????????????