ASTM A709


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  ≤ 1-1/2 in.

1-1/2 in. < t  ≤ 2-1/2 in.

2-1/2 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 A-709

Manganese, max

t ≤ 3/4 in.

3/4 in. < t  ≤ 1-1/2 in.

1-1/2 in. < t  ≤ 2-1/2 in.

2-1/2 in. t  ≤  4 in.

 

...

0.80-1.20

0.80-1.20

0.85-1.20

1.35

0.80-1.25

0.75-1.35

0.80-1.35

1.10-1.35

Please refer to ASTM A-709

Phosphorus, max

0.04

0.04

0.04

0.020

Please refer to ASTM A-709

Sulphur, max

0.05

0.05

0.05

0.006

Please refer to ASTM A-709

Silicon

 ≤ 3/4 in.

3/4 in. < t  ≤ 1-1/2 in.

1-1/2 in. < t  ≤ 2-1/2 in.

2-1/2 in. t  ≤  4 in.

 

0.40

0.40

0.15-0.40

0.015-0.40

 

0.40

0.40

0.30-0.65

0.15-0.50

0.15-0.40

0.30-0.50

Please refer to ASTM A-709

0.15-0.40

0.15-0.40


* 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  ≤ 2-1/2 in.

t > 2

t  ≤ 2-1/2 in.

t > 2

Tensile Strength:

58,000 -80,000 psi

[400-550 MPa]

65,000 psi

[450 MPa]

70,000 psi

[485 MPa]

85,000-110,000psi

[585-760 MPa]

110,000-130,000psi

[760-895 MPa]

100,000-130,000psi

[690-895 MPa]

110,000-130,000psi

[760-895 MPa]

100,000-130,000psi

[690-895 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


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