Products Description
ASTM A709 Grade HPS 50W steel is a kind of low alloy high strength structural steel for bridges building. It owns minimum yield strength at 345Mpa. A709 Grade HPS 50W steel plates have enhanced atmospheric corrosion resistance.
For the delivery condition of steel plate A709 Grade HPS 50W, As rolled,Control rolled,TMCP with or without accelerated cooling,or quenching and tempering is all ok.
Products specification
| Thickness | Width | Length |
|---|---|---|
| 0.1875 to 3 inch | 72 to 120 inch | 240 to 1200 inch |
| Standard | Application | Grades |
| ASTM A709 | bridges, building, construction | 50, 50T, 50F |
Impact Properties of ASTM A709-50 structural steel plate
| GRADE | THICKNESS (in) |
MIN LONGITUDINAL INDIVIDUAL VALUE 1) (ft-lbs) |
MIN LONGITUDINAL AVERAGE ENERGY 1) (ft-lbs) |
ZONE 2 TEST TEMP | ZONE 1 TEST TEMP | ZONE 3 TEST TEMP |
|---|---|---|---|---|---|---|
| 50T | 2.01 – 3.00 | 15 | 20 | 40 oF | 70 oF | 10 oF |
| 50T | 0.1875 – 2.00 | 10 | 15 | 40 oF | 70 oF | 10 oF |
| 50F | 0.1875 – 2.00 | 20 | 25 | 40 oF | 70 oF | 10 oF |
| 50F | 2.01 – 3.00 | 24 | 30 |
Dimension chart of A709 gr50 plate
| GRADE | WIDTH (in) |
THICKNESS (in) |
LENGTH (in) |
|---|---|---|---|
| 50F | 72 – 120 | 2.51 – 3.00 1) | 240 – 1200 |
| 50T | 72 – 120 | 0.1875 – 3.00 | 240 – 1200 |
| 50 | 72 – 120 | 0.1875 – 3.00 | 240 – 1200 |
| 50F | 72 – 120 | 0.1875 – 2.50 | 240 – 1200 |
ASTM A709-50 plate mechanical properties
| GRADE | THICKNESS (in) |
ELONGATION IN 2″ 2) (MIN %) |
TENSILE STRENGTH (MIN ksi) |
YIELD STRENGTH 1) (MIN ksi) |
ELONGATION IN 8″ 2) (MIN %) |
|---|---|---|---|---|---|
| 50T | 0.1875 – 3.00 | 21 | 65 | 50 | 18 |
| 50 | 0.1875 – 3.00 | 21 | 65 | 50 | 18 |
| 50F | 0.1875 – 3.00 | 21 | 65 | 50 | 18 |
A709 grade 50 plate chemical properties
| TYPE | MN 1) (wt %) |
C 1) (MAX wt %) |
S (MAX wt %) |
P (MAX wt %) |
CU 3) (MIN wt %) |
SI 2) (wt %) |
CB (wt %) |
V (wt %) |
V+NB (wt %) |
|---|---|---|---|---|---|---|---|---|---|
| 2 | 1.35 | 0.23 | 0.030 | 0.030 | 0.20 | 0.40 | - | 0.01 – 0.15 | - |
| 1 | 1.35 | 0.23 | 0.030 | 0.030 | 0.20 | 0.40 | 0.005 – 0.05 | - | - |
| 3 | 1.35 | 0.23 | 0.030 | 0.030 | 0.20 | 0.40 | 0.005 – 0.05 | 0.01 – 0.15 | 0.02 – 0.15 |
What are the differences between A709 gr. 50 and 50w
A709 Grade 50 contains more C and slightly higher Mn content. A709 Grade 50W has additional alloying elements.
ASTM A790-50 steel plate has no added corrosion resistant elements. Grade 50W can exhibit enhanced atmospheric corrosion resistance due to its alloying elements. It forms a protective rust like layer when exposed to weathering so it does not require additional surface coating
Applications of ASTM A709 Grade HPS 50W Steel in Bridge Construction
ASTM A709 Grade HPS 50W steel is a high-performance weathering steel (HPS) specifically developed for modern bridge construction. The "50W" designation indicates a minimum yield strength of 345 MPa (50 ksi) and enhanced atmospheric corrosion resistance, while the "HPS" (High Performance Steel) label signifies improved toughness, weldability, and formability-key factors in achieving superior bridge design and durability.
In bridge engineering, A709 HPS 50W is widely used in the fabrication of main girders, cross beams, orthotropic decks, trusses, and box girders. Its combination of high strength and corrosion resistance makes it ideal for both highway and railway bridges, reducing maintenance needs and extending service life, especially in harsh outdoor environments exposed to rain, salt, or humidity.
The weathering properties of A709 Gr. HPS 50W allow it to form a stable oxide layer (patina) that protects the steel surface from further corrosion, eliminating the need for painting in many cases. This feature greatly reduces life-cycle costs for large-scale infrastructure projects. Additionally, its excellent fracture toughness ensures safety under dynamic and fatigue loading conditions, making it well-suited for long-span bridges, cable-stayed structures, and elevated expressway systems.
Engineers also favor A709 HPS 50W for bridge rehabilitation and replacement projects, where it can seamlessly integrate with existing structural systems while providing improved mechanical performance. When combined with advanced welding techniques and optimized plate thickness, it contributes to lighter, stronger, and more sustainable bridge designs that meet the demands of 21st-century transportation networks.
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