???? ???????? ?????????? ?????? ?????, ????? ???????, ?????? ??????? ??????? ??? ???????? ?? ??, ??? ?????? HRC60 ???????, ????? ????????? ?????? ???? ??? ???? ?????? ?? ??, ???? ???? ???????? ????????????? ??? 3-5 ???????? ???? ?; ???????? ??????? ??????? ?????? ????, ???????? ???? ??????????? ?? ???? ???, ?????????? ????????? ?????? HRC58-HRC62 ??? ??? ?? ????? ????????? ????? ??????? ????? ????? ???? ???????? ???????? ?????; ???? ??????????, ?????? ????? ??? ??? ???? ??????? ????????? ?????? ≤ HRC32 ??; ?????? ???? ??????-?? ??? ???? ????, ?? ??? ??? ????? (??? ?????????) ???????? ?? ???? 5g ??? ???? ??? ????? ?? ???, ???? ?????? ????????????? ????? ????. ????? ?????.