????? ???????? ?? ???? ????? ??? ?????? ??????? ????, ????? ????? ?? ???? ?????? ?? ?? (????? ?????? ??????). ??????? ?? ??? ?????? ?? 19.3 (20 ° C), ?? ?? ???? ???? ????. Alladaysteen ???? ?? ??? ????? ?? ????? ?????? ???? ???? ????? ?????? ?? ?????, ?? ??????? 100% ???? ????.?? "???????" ???? ??? ???? ????? ?????? ????? ??????? ??????? ?????.
????? ???????? ???? ??? ????? ?? ????? ??? ????? ????.?? ??????? ???? ??? ???? ????? ???? ??????? ?????? ??? ????? ???? ????? ?? ????? ????.
????? ?????? ???? ??????? ???? ??? billets ?????? ????? ??????, ??????? 70 ~ 90% ??????? ???? ????? ?? ??? ?? ???? ???? ???, ??? 14 ~ 18 ??? 18 ~ 40 ??? ??????, ???????, 65% ? 95 ~ 97% ??????? ?????? ??????? ????? "???? ???????.