ASTM A178

Chemical Properties

Grade A
Low-Carbon

Grade C
Medium-Carbon Steel

Grade D
Carbon-Manganese Steel

C

0.06-0.18

0.35 max

0.27 max

Mn

0.27-0.63

0.80 max

1.00-1.50

P

0.035

0.035

0.030

S

0.04

0.035

0.015

Si

-

-

0.10 min

Grade

Tensile Point (Mpa)

Yield Point (Mpa)

Elongation (%) in 2 in. or 50mm

Grade C

255

415

30

Grade D

75

485

30