1, Chemical composition:

A              C             D

Carbon                   0.06-0.18       0.35Max     0.27Max

Manganese               0.27-0.63       0.8Max      1.00-1.50

Phosphorus, max           0.035          0.035        0.030 

Sulfur, max               0.035           0.035        0.015

Silicon                   ....         ......            0.10Min

2, Mechanical Properties:

For Grade A
Tensile strength, min, ksi [MPa] 47 [325]
Yield Strength, min, ksi [MPa] 26 [180]
Elongation in 2 in. or 50 mm, min, %35

For Grade C
Tensile strength, min, ksi [MPa] 60 [415]
Yield Strength, min, ksi [MPa] 37 [255]
Elongation in 2 in. or 50 mm, min, %30
For Grade D
Tensile strength, min, ksi [MPa] 70 [485]
Yield Strength, min, ksi [MPa] 40 [275]
Elongation in 2 in. or 50 mm, min, %30