Composición%

Nivel A

Nivel B

Nivel C

Carbon

≦0.25

≦0.30

≦0.35

Magnesio

0.27-0.93

0.29-1.06

0.29-1.06

Fósforo

≦0.035

≦0.035

≦0.035

Azufre

≦0.035

≦0.035

≦0.035

Silicio

≧0.10

≧0.10

≧0.10

Cromo

≦0.40

≦0.40

≦0.40

Cobre

≦0.40

≦0.40

≦0.40

Molibdeno

≦0.15

≦0.15

≦0.15

Níquel

≦0.40

≦0.40

≦0.40

Vanadio

≦0.08

≦0.08

≦0.08