?????? ?????? ????????? ??????? ???, ??????? ??????, ????????? ??????????? ????????? ???? ???????? ?????, ???? ?????? HRC60 ??????? ?????, ?????? ??????????? ?????? ????? ?????, ???? ????????? ?????? ?????????? 3-5 ??? ???? | - ???????? ??????????? ????????? ????, ???????? ??????? ????? ??? ???????? ??????? ?????????? ????????, ??????????????? ?????????, ?????????? ???? ???????? ?????????? ????? ???? ???????? ???????? ???? ?? the ??? ??????? ???????? ?????? HRC58-HRC62; ????? ????????, ???????? ?????? ????????? ??-??????????? ?????? ?????? ≤ HRC32 ???; ???????