Structural Steel for Steel Bridge Construction to ASTM A 709/A 709M Standard
Use:This specification covers seven grades of quenched and tempered alloy steel for structural plates intended for use in steel bridge construction. A709 Bridge Steel Chemical Properties

Grade 36 [250]

Grade 50 [345]
types

Grade 50W [345W] types

Grade HPS 70W

Grade 100 [590W] & 100W [590W]
types

1

2

3

4

A

B

C

A

B

C

Carbon,
max
t ≤ 3/4 in.
3/4
in. < t ≤ 11/2
in.
11/2
in. < t ≤ 21/2
in.
21/2
in. t ≤
4 in.

0.25
0.25
0.26
0.27

0.23

0.19

0.20

0.15

0.11

Please refer to ASTM A709

Manganese,
max
t ≤ 3/4 in.
3/4
in. < t ≤ 11/2
in.
11/2
in. < t ≤ 21/2
in.
21/2
in. t ≤
4 in.

...
0.801.20
0.801.20
0.851.20

1.35

0.801.25

0.751.35

0.801.35

1.101.35

Please refer to ASTM A709

Phosphorus,
max

0.04

0.04

0.04

0.020

Please refer to ASTM A709

Sulphur,
max

0.05

0.05

0.05

0.006

Please refer to ASTM A709

Silicon
≤ 3/4 in.
3/4
in. < t ≤ 11/2
in.
11/2
in. < t ≤ 21/2
in.
21/2
in. t ≤
4 in.

0.40
0.40
0.150.40
0.0150.40

0.40
0.40

0.300.65

0.150.50

0.150.40

0.300.50

Please refer to ASTM A709

0.150.40
0.150.40

* Note: For each
reduction of 0.01% below the specified carbon maximum, an increase of
0.06% manganese above the specified maximum will be permitted, up to
the maximum of 1.35%. A709 Bridge Steel Mechanical Properties

Grade
36 [250]

Grade
50 [345]

Grade
50W [345W]

Grade
HPS 70W

Grade
100 [590]

Grade
100W [590W]

t ≤ 21/2 in.

t
> 2

t ≤ 21/2 in.

t
> 2

Tensile
Strength:

58,000 80,000 psi
[400550 MPa]

65,000 psi
[450 MPa]

70,000 psi
[485 MPa]

85,000110,000psi
[585760 MPa]

110,000130,000psi
[760895 MPa]

100,000130,000psi
[690895 MPa]

110,000130,000psi
[760895 MPa]

100,000130,000psi
[690895 MPa]

Min.
Yield Point:

36,000psi
[250 MPa]

50,000psi
[345 MPa]

50,000psi
[345 MPa]

70,000psi
[485 MPa]

100,000psi
[690 MPa]

90,000psi
[620 MPa]

100,000psi
[690 MPa]

90,000psi
[620 MPa]

Elongation:

23% min

21% min

20% min

20% min

18% min

16% min

18% min

16% min

We can supply:Thickness from 6mm to 100mm (although thicker plates might be manufactured under special order)
Width: from 1,500mm to 4,100mm
Length: from 6,000mm to 20,000mm 