Grade

Tensile
Strength
(M PA) (KSI)

Yield
Strength
(M PA) (KSI)

Elongation
(%)

Impact Energy*
(J) (ft-lbs)

Typical
Hardness
BHN (B.I.D.)

1

860  125

550   80

10

105

75

269-321
(3.4-3.7)

2

1035   150

690   100

7

90

65

3

1200   175

830   120

4

60

45

363-444
(2.9-3.2)

4

1310   190

965   140

1

40

30

388-477
(2.8-3.1)

5

1450   210

1105   160

418-512
(2.7-3.0)

6

1585   230

1240   180

444-555
(2.6-2.9)