 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
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|
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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