Mastering High-Strength Structural Fabrication
In heavy industries such as transportation, lifting, and offshore engineering, reducing weight while maintaining or increasing load-bearing capacity is critical. High-Strength Low-Alloy (HSLA) and advanced high-strength structural steels are the solution, but they require highly specialized fabrication techniques.
Unlike standard carbon steel, high-strength steels are highly susceptible to cracking, warping, and extreme springback during forming. At Openex Metal Fabrication, we have the massive press brake tonnage, advanced thermal controls, and metallurgical expertise required to successfully cut, bend, and weld these demanding alloys.
High-Strength Grades We Process
We source and process fully certified, globally recognized high-strength plates, including:
- ASTM A514 (T-1) Quenched and tempered alloy steel plate commonly used in crane booms and heavy earth-moving equipment.
- EN S690QL / Q690 European/Chinese standard high-yield structural steel used for extreme load-bearing offshore platforms and bridges.
- Strenx® / Weldox® Premium high-strength structural steels optimized for lifting equipment and lighter, stronger transport trailer chassis.
- HSLA Steels Grades like A572 (Grade 50/65) that provide better mechanical properties and greater resistance to atmospheric corrosion.
Overcoming High-Strength Fabrication Challenges
1. Heavy Press Braking & Springback Control
Bending high-strength steel requires significantly more machine tonnage than mild steel, and the material exhibits severe "springback" after bending. Openex operates enormous press brakes up to 3000T. Combined with our advanced CNC angle-measurement systems and large bending radii tooling, we achieve precise, crack-free bends on heavy high-strength plates up to 15 meters in length.
2. Precision Thermal Cutting
Excessive heat input during plasma or oxy-fuel cutting can destroy the tempered properties of high-strength steel edges. We utilize high-speed, underwater plasma cutting and high-wattage laser cutting to minimize the Heat Affected Zone (HAZ), ensuring the edges remain ductile for subsequent forming or welding.
3. Strict Welding Protocols
Welding HSLA steels carries a high risk of hydrogen-induced cold cracking. Our AWS and ASME certified welders follow strict Welding Procedure Specifications (WPS). We utilize meticulously controlled pre-heating, interpass temperature monitoring, low-hydrogen consumables, and post-weld heat treatment (PWHT) in our massive on-site furnaces to guarantee structural integrity.
Common Industry Applications
By leveraging high-strength steel, we help our clients build equipment that can lift more, haul more, and survive longer:
- Lifting & Cranes: Telescopic crane booms, lifting frames, and heavy winches.
- Transportation: Heavy-duty trailer chassis, flatbeds, and railway equipment frames.
- Mining & Construction: Excavator arms, structural beams for draglines, and heavy machine beds.
- Offshore & Energy: Jack-up rig components, wind tower internals, and bridge structural columns.