ASTM A709 Grade HPS 70W

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General Product Description

The ASTM A709 is the Standard Specification for Structural Steel for Bridges and encompasses carbon, high-strength low-alloy, and quenched and tempered alloy steels used as structural plates in the construction of bridges. Of the five grades SSAB offers, three grades have an ASTM G101 enhanced Atmospheric Corrosion Resistance Index of ≥6.0.

Available Dimensions

Grade
Grade
HPS 70W
Thickness
(inmm)
0.750 - 1.24919.0 - 31.72
Width
(inmm)
72 - 1201800 - 3050
Length
(inmm)
240 - 11766100 - 29870
Grade
Grade
HPS 70W
Thickness
(inmm)
1.25 - 2.0031.8 - 50.8
Width
(inmm)
72 - 1201800 - 3050
Length
(inmm)
240 - 11046100 - 28040

Width: Please inquire for plate widths less than 72 in. and over 120 in. Please inquire for plate lengths greater than 1020 in.

Length: Plate length may be limited by maximum individual plate weight of 66.000 lbs.

Thickness: Please inquire for thicknesses greater than 2.00 in.

Mechanical Properties

Tensile testing is performed in the transverse direction according to ASTM A370 requirements.

Grade
Grade
HPS 70W
Thickness
(inmm)
0.750 - 2.0019.0 - 50.8
Yield strength 1)
(min ksi)
70
Tensile strength
(min ksi)
85
Elongation in 2" 2)
(min %)
19

1) Yield strength measured as 0.2% offset or 0.5% extension under load.

2) For plates wider than 24 in, the elongation requirement is reduced by two percentage points. See elongation requirement adjustments in the Tension Test section of Specification ASTM A6.

Impact Properties

Grade
Grade
HPS 70WT
Thickness
(inmm)
0.750 - 2.00019.0 - 50.80
Min Longitudinal Average Energy 1)
(ft-lbs)
25
Min Longitudinal Individual Value
(ft-lbs)
—
Zone 1 Test Temp
-10 oF
Zone 2 Test Temp
-10 oF
Zone 3 Test Temp
-10 oF
Grade
Grade
HPS 70WF
Thickness
(inmm)
0.750 - 2.00019.0 - 50.80
Min Longitudinal Average Energy 1)
(ft-lbs)
35
Min Longitudinal Individual Value
(ft-lbs)
28
Zone 1 Test Temp
-10 oF
Zone 2 Test Temp
-10 oF
Zone 3 Test Temp
-10 oF

1) CVN impact testing in accordance with ASTM A673.
Please inquire for orders requiring CVN impact testing.

Chemical Composition

(Heat Analysis, wt. %, maximum unless noted)
Type
Type
HPS 70W
Thickness (inmm)
0.750 - 2.0019.0 - 50.8
C
(max wt %)
0.11
Mn
(wt %)
1.10 - 1.35
P
(max wt %)
0.020
S
(max wt %)
0.006
Si
(wt %)
0.30 - 0.50
Altot
(wt %)
0.010 - 0.040
V
(wt %)
0.04 - 0.08
Cr
(wt %)
0.45 - 0.70
Ni
(max wt %)
0.40
Mo
(wt %)
0.02 - 0.08
Cu
(wt %)
0.25 - 0.40

Sulfur: The steel shall be calcium treated for sulfide shape control.

Steel made to fine grain practice.

Tolerances

Thickness, width, and length tolerances are in accordance with ASTM A6 requirements. The flatness tolerance for as-supplied product is halfstandard ASTM A6 tolerance.

Fabrication and Other Recommendations

Please contact SSAB for technical support for welding, thermal cutting, and forming assistance, if needed.

Supplementary Requirements

Please see the ASTM A709 standard for supplementary requirements considered suitable for use with this specification.

Please inquire for orders requiring supplementary requirements.

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