A.HRC40 B.HRC50 C.HRC60 D.HRC30
A.0.6%-1.5% B.0.15%-0.25% C.0.6%-0.7% D.0.8%-0.9%
A.0.25%-0.5% B.0.15%-0.25% C.0.6%-0.7% D.0.7%-0.8%