ASTM A283 Steel Structure | High-Strength, Durable & Cost-Effective Construction Solutions
Steel Truss Frame Structure for Modular Building The steel truss frame is a kind of structural system in which the steel members are connected together in the form of triangular units in a particular sequence to make a rigid frame that can be used to support the applied loads. Triangular shape maximizes strength and stability with less material and is suitable for long span and open room.
Outstanding Features
High Strength-to-Weight Ratio -- Triangular truss geometry enables strong load carrying capacity with less steel.
Wide Clear Span - Covers a wide area without internal columns.
Multi-purpose design - Good for warehouses, workshops, manufacturing plants and for auditoriums & sports halls.
Prefabrication & Rapid Assembly - Steel parts are pre-cut and formed off-site and quickly bolted together on-site.
Longevity – With adequate application of corrosion protection (galvanizing, painting, or coating), a steel structure will have a service life many decades long.
Parts
Top Chord: Upper horizontal or sloped member of the truss
Bottom Chord: Bottom horizontal member in tension
Web Members: Diagonal and vertical elements that compose the triangular unit
Connections: Bolted or welded seams that joins the members
Bracing (Optional): Extra lateral stability for large spans
Core steel structure products for factory construction
1. Main load-bearing structure (adaptable to tropical seismic requirements)
| Material | ASTM A283 (Main structural members) |
| Span Range | 10–50 m (33–164 ft), customizable |
| Eave Height | 4–12 m (13–39 ft), based on project requirements |
| Roof Pitch | 5°–25°, adjustable according to drainage needs |
| Main Components | Top Chord (W/H steel), Bottom Chord (W/H steel), Web Members (square/rectangular tube, angle steel), Connections (bolted/welded), Purlins & Girts (C/Z profile) |
| Core Functions | - Large clear span support |
| - High strength-to-weight ratio | |
| - Rapid prefabrication & assembly | |
| - Structural stability & durability | |
| - Flexible design for single/multi-span and multi-storey buildings | |
| Common Applications in Central America | - Industrial: factories, workshops, warehouses |
| - Agricultural: storage sheds, barns, farm facilities | |
| - Commercial: supermarkets, logistics centers, exhibition halls | |
| - Special: sports halls, aircraft hangars, public facilities |
| Processing Method | Processing Machines | Processing |
| Cutting | CNC plasma/flame cutting machines, shearing machines | Plasma flame cutting for steel plates/sections, shearing for thin steel plates, with dimensional accuracy is controlled. |
| Forming | Cold bending machine, press brake, rolling machine | Cold bending (for c/z purlins), bending (for gutters/edge trimming), rolling (for round support bars) |
| Welding | Submerged arc welding machine, manual arc welder, CO₂ gas-shielded welder | Submerged arc welding (Dutch columns / H beams), stick weld (gusset plates), CO² gas shielded welding (thin walled items) |
| Holemaking | CNC drilling machine, punching machine | CNC Boring (bolt holes in connecting plates/components), Punching (batch small holes), With controlled holes diameter/position tolerances |
| Treatment | Shot blasting/sand blasting machine, grinder, hot-dip galvanizing line | Rust removal (shot blasting / sand blasting), weld grinding (deburr), hot-dip galvanizing (bolt/support) |
| Assembly | Assembly platform, measuring fixtures | The components of pre-assembled (column + beam + base) were disassembled for shipping after dimension verification. |
| 1. Salt spray test (core corrosion test) | 2. Adhesion test | 3. Humidity and heat resistance test |
| Standards ASTM B117 (neutral salt spray) / ISO 11997-1 (cyclic salt spray), suitable for the high-salt environment of the Central American coast. | Cross-hatch test using ASTM D3359 (cross-hatch/grid-grid, to determine peeling level); pull-off test using ASTM D4541 (to measure peel strength between coating and steel substrate). | Standards ASTM D2247 (40℃/95% humidity, to prevent blistering and cracking of the coating during rainy seasons). |
| 4. UV aging test | 5. Film thickness test | 6. Impact strength test |
| Standards ASTM G154 (to simulate strong UV exposure in rainforests, to prevent fading and chalking of the coating). | Dry film using ASTM D7091 (magnetic thickness gauge); wet film using ASTM D1212 (to ensure corrosion resistance meets specified thickness). | Standards ASTM D2794 (drop hammer impact, to prevent damage during transportation/installation). |
1. Overseas Branch & Spanish Language Support
We have foreign offices with Spanish-speaker personnel and we can speak 2 languages with our clients from Latin America and Europe.
Our team streamlines customs clearance, documentation, and export requirements to facilitate on-time delivery and expedite import processing.
2. Ready Stock For Fast Delivery
We keep sufficient standard hot rolled steel structure raw material stocks like H beam, I beam and steel structure components.
This means quicker lead times so customers can get a product they can count on, fast, for those emergency jobs.
3.Professional Packaging
All products are packed with standard seaworthy packaging(steel frame bundling,waterproof wrapping,edges protection).
This will guarantee and ensure safe loading, no movement during long distance transport and no damage when arrived at destination port.
4.Efficient Shipping & Delivery
We work with reliable national shippers and can provide flexible delivery terms:FOB, CIF, DDP.
by sea,rail,road,we promise you timely shipment and effective logistic tracking service.
Treatment on surface Display: Epoxy zinc-rich coating, Galvanized(hot dip galvanized layer thickness≥85μm service life can reach 15-20 years), black oiled, etc.
Black Oiled
Galvanized
Epoxy Zinc-rich Coating
Package：
The products are well protected in packaging to keep their surface and structure intact during handling. The parts are normally packaged with waterproof materials such as plastic film or rust proof paper and the small accessories are packed with wooden box. In addition, all the straps/parts are clearly marked to guarantee safe unloading and professional installation on site.
Transport:
Steel structures can be shipped by container or bulk carrier according to the size and destination. Large or heavy items are also firmly fastened by steel straps with wooden strips on both sides for double protection during transportation. All the processes in logistics are done according to the international transportation standard, even the long distance and overseas, to make sure the products delivery on time and safety.
1. What is ASTM A283 steel?
ASTM A283 is a low/medium carbon steel grade that is mainly utilised in general structural applications that require good formability and weldability. It is available in Grade A, B, C, D and the tensile strength is increasing from Grade A to D.
Grade A – Least tensile strength most ductility
Grade B & C – Moderate Strength and Ductility
Grade D - Highest Tensile Strength of the A283 Grades
2. What are the typical applications of ASTM A283 steel structures?
Typical applications for A283 include light-medium frames: such as
industrial and warehouse buildings,bridges and platforms, and other light-commercial applications, can now be constructed in aluminum, thanks to the superior strength and corrosion-resistance properties.
Engineered steel components like girders, beams, and columns
Steel grades for moderate strength, good weldability structural plates and panels
3. In what shapes and sizes is ASTM A283 available?
Plates – always 6–200 mm thick
Sheets – Thin section for structural panels
Coils – occasionally for further processing
4. What is the weldability of ASTM A283?
Excellent weldability - MIG, TIG and stick welding are best.
Thin plates (<25 mm) do not generally require preheating.
To prevent cracking when welding thick sections, use of low-hydrogen welding processes is recommended.
6. Can A283 be galvanised or painted?
Yes. The surface of the steel can be:
Hot-dip galvanizing – popularly employed for rust protection
Painting or powder coating – popular for use in building facades and industrial buildings
