?
, 53,98%. .
(C49) (C54). : = 0,362 , b = 1,376 , c = 0,360 . : = 0,8279 , b = 0,4819 , c = 0,8568 . 650 °C.
6-09-03-406-75. :
, %,
45,0
0,05
, .