Structural Steel

The STI Group provides comprehensive structural steel and plate fabrication services.


Project Execution


Uncompromising safety


Structural Steel

The STI Group provides comprehensive structural steel and plate fabrication services. From our early beginnings as sheet metal fabricators, we grew the largest segment of our business model. We can handle any shape or size, making us the industry’s leading structural steel company. This is one of our core specialties and uniquely qualifies and equips us to handle any job, large or small. With indoor fabrication facilities exceeding 150,000 SF, we can tackle the large complex fabrication commonly associated with capital projects using our state-of-the-art fabricating facilities. With our in-house capacity and diverse industrial capabilities, we stand out among structural steel contractors, executing our fabrication process like few can. With years of industrial expertise, we offer you a comprehensive range of fabrication and manufacturing services, unrivaled in the industry.

As structural steel manufacturers, we are qualified with ASME U, S, and NBIC R stamps, performing your projects with nationally and globally accepted credibility and certifications. We are also licensed with the coveted API 4F Monogram, which certifies that we have passed rigorous auditing of processes and procedures that enable us to produce API Certified masts, derricks, and substructures. We manufacture, construct complete land-based drillings rigs, including drilling rig mast, derrick, sub structure, mud systems, water tanks, engine skids, jacking systems, wind walls and all interconnection piping spool systems.

We also specialize in heavy structural fabrication, including large ducting, panels, and stacks for SCR modules, heaters, reformers, and boilers. We fabricate platforms, ladders, and knocked-down steel for pipe racks, making us a reliable steel structure fabrication company for structures and buildings as well. Materials used include hot rolled steel, carbon steel, galvanized steel, stainless steel, Cor-ten®, aluminum, Inconel®, Monel® & Hastelloy® to name a few common alloys.

Shop Advantage and Capabilities

Knowledgeable shop operations teams, including in-house inspectors ensure unparalleled welding quality pertaining to many common and uncommon structural steel alloys. Products are inspected by full time quality control inspectors and procedures are assured by certified welding inspector (CWI). Our project managers work with each customer to streamline the fabrication of their products through our manufacturing facility.

The STI Group structural steel shops are equipped with the most modern state of the art welding equipment on the market, enabling us to provide very competitive pricing for our customers. Welding processes of GTAW commonly know as tig welding, GMAW-Short Arc and PULSE known as mig welding, SMAW referred to as shielded metal arc welding or stick rod, FCAW is known also as flux core welding, SAW is submerged arc welding, are all used in our facilities for broad application, diversity and fabrication efficiency.

And because we employ two shifts in our fabrication facilities, we can expedite and deliver your project efficiently helping to meet your deadlines. This includes tackling tough time sensitive shut-down work in which we excel in, when timing and deadlines are especially critical. While you have a project in our shop, it becomes your shop, with knowledgeable people, state-of-the-art equipment and facilities, and a friendly and cooperative attitude.

From project management through fabrication, welding, painting, assembly, testing and shipping, you get the services you need to produce your product. We want to become long-term partners. You can count on The STI Group for the best people working in the safest and most efficient way to deliver the highest level of quality and dependability – all of which translate to added customer value.

Utilizing the Latest Software, Technology and Equipment

STI Group-Fabrication utilizes the latest software, technology and equipment in the industry. We offer design, in-house detailing personnel and field sketching services as well. With the utilization of our Fabtrol Systems, we provide integrated MRP software for the steel fabrication, including estimating, drawing management, material nesting, purchasing, inventory control, production and CNC management, shipping, and more. And by using Lean Manufacturing processes, we are able to accurately and efficiently execute, track and deliver your project.

We also have an established File Transfer Protocol (FTP) site which allows us to send and receive electronic bills of materials and drawings. This capability eliminates the redundant regeneration of bid documents and project documents alike. This also provides our customers greater control over their time sensitive projects by being able to quickly and efficiently transfer information between The STI Group and themselves. If you require a large project executed or a single beam fabricated look no further, STI Group-Fabrication is your one stop solution to all your structural steel fabrication needs.

Diversified Core Products, Manufacturing Capabilities, Services List

  • Light, Medium, and Heavy Structural Fabrication
  • Plate Steel Fabrication
  • Miscellaneous Steel
  • Custom Fabrications
  • Land Rig Packages
  • Masts / Substructures
  • Complex Truss Systems
  • Transverse Box Truss
  • Heavy Columns
  • Offshore Structures
  • Equipment Skid Assemblies
  • Skidded Packages
  • Production Module Packages
  • Modular Fabrication
  • Process Equipment Skids
  • Oilfield Components (Onshore and Offshore)
  • High Pressure Piping
  • Offshore Cranes, Derricks, Platforms
  • Draw Works Frames
  • Offshore Riser Handling Systems
  • Industrial Structural Rolled Cones
  • Formed Cones Transitions: Square to Square, Square to Round, Round to Round
  • Derrick Legs, V-Door Ramp
  • Box-On-Box Substructure
  • Riser Cart, Crane Booms
  • Platform Base for Crane Pedestal
  • Watertight Doors
  • Round Duct, Flat Panel Duct, Hoppers,
  • Walkway Access, Handrail, Ladders, Stairs
  • Steel Joists, Decking
  • Joist, Joist Girders, Bridging
  • Roof Deck, Floor Deck
  • Heavy Duty Application
  • Painting/Coating System Application
  • Comprehensive General Contracting
  • Contract Manufacturing
  • Project Management
  • Design-Build Projects
  • Field Services
  • Rig-Up Services
  • Commissioning / Testing

STI Group-Fabrication serves the following industries:

  • Petrochemical
  • Chemical
  • Refining
  • Oil & Gas Production
  • Drilling
  • Energy
  • Power Generation