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