A.0.35—0.45 B.0.20—0.30 C.0.25—0.35 D.0.10-0.20
A.3%--5% B.2%--4% C.0.2%--0.4% D.5%--8%
A.≤0.15 B.≤0.015 C.≤1.50 D.≤1.00