The store will not work correctly in the case when cookies are disabled.
We use cookies to analyze traffic and improve your experience.
We may also share your information with our analytics partners to improve our website, as detailed in our
Privacy Policy. You consent to our cookies if you continue to use this website.
Leeco® Steel stocks ample inventories of ASTM A709 steel plate in standard and high-performance grades.
A709 Steel Plate Overview:
Common steel plate grade used primarily for the manufacture of bridges.
Heavy thicknesses (3-inches or thicker) available at most Leeco Steel distribution centers.
Available in standard grades: 36, 50 and 50W.
Available in high-performance grades: HPS 50W and HPS 70W.
Dual ASTM and AASHTO spec certifications are available.
Customers can specify A709 grades to meet Charpy test requirement for specific zones and climate.
Available Sizes
Leeco Steel stocks the following standard sizes, but other sizes may be available for special orders.
GRADE
THICKNESS
WIDTH
LENGTH
36
3/16" – 4"
48" – 120"
Up to 480"
50
3/16" – 4"
48" – 120"
Up to 480"
50W
3/16" – 4"
48" – 120"
Up to 480"
HPS 50W
3/16" – 4"
48" – 120"
Up to 480"
HPS 70W
3/16" – 4"
48" – 120"
Up to 480"
Material Properties
The following material properties are ASTM specifications and will be confirmed on the Mill Test Report.
Grade
Yield Point (ksi)
Tensile Strength (ksi)
Min. 8” Elongation %
36
36
58-80
20
50
50
65
18
50W
50
70
18
HPS 50W
50
70
18
HPS 70W
70
85-110
19 at 2” elongation %
Chemical Composition
The following composition properties are ASTM specifications for the ASTM A709 grades. Note that the composition of chemicals ranges depending on the thickness of the material.
Grade 36
Carbon max
0.25-0.27%
Manganese*
...
Phosphorus max
0.030-0.040%
Sulfur max
0.030-0.050%
Silicon*
0.40% max
Copper min
0.20%
* Manganese content of 0.85 to 1.35 % and silicon content of 0.15 to 0.40 % is required for grade 36 shapes with flange thickness over 3 in.