No Mark

ASTM A563 Grade O

Carbon Steel

1/4 - 1-1/2

69

B55

C32

2,3

ASTM A563 Grade A

Carbon Steel

1/4 - 1-1/2

90

B68

C32

2,3

ASTM A563 Grade B

Carbon Steel

1/4 - 1

120

B69

C32

2,3

>1 - 1-1/2

105

ASTM A563 Grade C

Carbon Steel, may be Quenched and Tempered

1/4 - 4

144

B78

C38

4

ASTM A563 Grade C3

Atmospheric Corrosion Resistant Steel, may be Quenched and Tempered

1/4 - 4

144

B78

38

4,6

ASTM A563 Grade D

Carbon Steel, may be Quenched and Tempered

1/4 - 4

150

B84

C38

5

ASTM A563 Grade DH

Carbon Steel, Quenched and Tempered

1/4 - 4

175

C24

C38

5

ASTM A563 Grade DH3

Atmospheric Corrosion Resistant Steel, Quenched and Tempered

1/4 - 4

175

C24

C38

4,6