Structural Steel Plate
Commonly referred to as structural steel, mild and high strength low alloy (HSLA) steels are trusted materials for construction, infrastructure and heavy fabrication because they combine strength, durability and excellent weldability. ASTM A36 is the most used mild steel grade in the U.S.
Used in everything from buildings and bridges to energy, transportation and industrial projects, structural steel plate is available in a variety of grades including ASTM A36, A572 and A588 to meet different strength and performance requirements. Fabricators and engineers choose structural steel because it can be easily cut, formed and welded into critical components such as base plates, gussets, connection plates and support structures while maintaining long-term structural integrity.
HSLA steel plate builds upon the performance of traditional carbon steel by incorporating carefully controlled alloying elements that increase strength, toughness and atmospheric corrosion resistance while maintaining good weldability and formability. Common HSLA grades include ASTM A572, A588, A656, A709 and A871, which are frequently used in bridges, crane booms, truck frames, railcars, transmission poles, mining equipment and other applications where weight reduction and structural performance are critical.
At Leeco® Steel, we offer an extensive inventory of structural steel plate backed by ISO-certified quality management processes, rigorous quality assurance standards and mill test documentation to help customers buy with confidence. Our advanced processing capabilities, including laser cutting, plasma cutting, oxy fuel cutting, beveling and drilling, streamline production and reduce project lead times. Customers can also simplify procurement through Leeco® Pro, our eCommerce solution that provides real-time inventory visibility, pricing and online ordering 24/7.
Whether you need a common structural grade for general fabrication, a high-strength solution for demanding applications or weathering steel for improved corrosion resistance, Leeco Steel delivers the products, processing expertise and supply chain reliability needed to keep projects moving from quote to completion.
Grades
| Product | Grades |
|---|---|
| A283 | A283-C, A283-D |
| A36 | A36 |
| A572 | A572-42, A572-50, A572-55, A572-60, A572-65 |
| A573 | A573-58, A573-65, A573-70 |
| A588 | A588-A, A588-B, A588-K |
| A606 | A606-II, A606-IV, A606-V |
| A633 | A633-A, A633-C, A633-D, A633-E |
| A656 | A656-50, A656-80, A656-100, A656-60, A656-70 |
| A709 | A709-36, A709-50, A709-50W, A709-HPS 50W, A709-HPS 70W |
| A829 | 4140 Heat Treated, 4140 As Rolled |
| A871 | A871-60, A871-65 |
| AASHTO M270 | AASHTO M270-50, AASHTO M270-50W |
| CSA G40.21 38W & 44W | CSA G40.21 38W, CSA G40.21 44W |
| CSA G40.21 50A | CSA G40.21 50A |
| CSA G40.21 50W | CSA G40.21 50W |
