For a factory building project, the quality and schedule of the steel structure are determined right from the factory. The Hai Long Steel Structure Factory in Quyet Thang commune, Hai Phong, has a total investment of 400 billion VND, a capacity of 35,000 tons/year, and an automated equipment system among the most modern in the region.

Overview of Hai Long Steel Structure Factory

Category	Specifications
Location	Quyet Thang Commune, Hai Phong City
Total area	5 ha (3 ha factory area)
Total investment	400 billion VND
Capacity	35,000 tons of steel structure/year
Main production lines	Smart-Line 1,300 tons/month · Auto-Line 1,000 tons/month
Factory workforce	300 people
Products	Steel structure, purlins, steel sheets
Management system	ISO 9001, ISO 14001, ISO 45001

Hai Long started as a sheet metal and purlin rolling workshop in 1999. After several investment phases, all production activities have been moved to the new factory with capacity increased to 35,000 tons/year.

6-stage steel structure fabrication process

1. Drawing deployment and input material control

Design drawings are deployed into fabrication drawings for each component. Steel imported into the warehouse is checked for CO, CQ certificates, and steel grade before entering production.

2. Cutting with 30–80 kW laser system

Steel plates are cut on a 30–80 kW laser cutting system, providing precise cuts and clean edges, ensuring parts fit perfectly during assembly.

**30kW Laser cutting machine at Hai Long Steel Structure Factory**

3. Assembly and automatic welding with Smarobics robots

Components are assembled on the Smart-Line and Auto-Line production lines. The Smarobics automatic welding robot system ensures uniform welds, reduces dependence on individual welder skills, and increases productivity.

steel structure fabrication using automatic welding robots — ***Smarobics automatic welding robot at Hai Phong steel structure factory***

4. Surface cleaning with a 48m shot blasting system

Before painting, components pass through a 48m-long shot blasting system to remove rust, mill scale, and impurities. A clean surface is essential for the paint layer to adhere firmly and achieve its design lifespan.

5. Automatic painting and drying

The automatic painting and drying system ensures the steel structure anti-rust coating is applied evenly, dries quickly, and is less dependent on weather conditions – a crucial factor in the hot, humid, coastal climate of Hai Phong. The paint system is selected according to the technical requirements of each project.

6. Inspection, packaging, and transportation

Finished components are inspected according to the ISO 9001 quality management process, coded according to erection drawings, and transported to the construction site in the correct sequence.

Why is an in-house factory an advantage for a general contractor?

Proactive schedule: fabrication runs in parallel with foundation construction, independent of external fabrication schedules.
End-to-end quality control: a unified management system from design and production to erection.
Cost stability: proactive material sourcing and production capacity, minimizing costs from outsourcing.
Meeting large-scale projects: a capacity of nearly 3,000 tons/month is sufficient to supply multiple projects simultaneously.

Thanks to this, Hai Long has supplied steel structures for projects such as LG Innotek Vietnam (14,500 tons), LG Display Vietnam (9,300 tons), Vung Ang Thermal Power Plant (8,600 tons), VinFast, Amkor, and Foxconn. [LINK: Steel Structure Projects Page] [LINK: SEO-05 – Comparison between pre-engineered steel buildings and concrete buildings]

Frequently Asked Questions

Where is the Hai Long Steel Structure Factory located? The factory is located in Quyet Thang commune, Hai Phong city.

Google Maps: https://share.google/4D5ie0h5aCCa0nIl6

Does the factory accept steel structure fabrication based on custom drawings? Yes. In addition to general contractor projects, Hai Long accepts fabrication and erection of steel structures based on drawings from investors or other general contractors.

Can investors visit the factory? Yes. Please schedule an appointment in advance so that our engineers can guide you.