Hello everyone, I am Duo Yuegang, founder and president of OHC Construction Group.

Having spent more than thirty years in the steel‑structure industry, from frontline riveter to corporate manager, I’ve witnessed China’s steel‑structure sector evolve from relying on the craftsmanship of master artisans to today’s era of “32 smart production lines churning out over a thousand tons per day.” Many people ask: What makes steel structures so special? Why are they being adopted for an ever-growing number of large‑scale projects? Starting today, I plan to use this account to discuss the “architectural skeleton” we work with every day—no fluff, just straight‑to‑the‑point insights.

I. What exactly is a steel structure?

Simply put, it is the “steel skeleton” of modern architecture. Compared with traditional concrete, steel structures offer three key advantages:

1. Light yet strong It weighs only one-third as much as concrete, yet its load-bearing capacity is higher.
2. Fast construction : Prefabricated in the factory and assembled on site, reducing construction time by 30% to 50%;
3. Eco-friendly and recyclable Steel recycling rates exceed 90%, making it the optimal solution under the “dual carbon” goals.

However, many people misunderstand steel structures, assuming they are merely “a few pieces of iron welded together.” In reality, a single qualified steel component is the result of a systematic engineering process that involves precise calculations, intelligent manufacturing, and tolerance control down to the millimeter.

II. What exactly makes Dongfang Cheng’s “six blockbuster products” so exceptional?

As the head of our company, let me be clear: Dongfang Chengneng has successfully launched projects in more than ten provinces and municipalities nationwide—not through price wars, but by leveraging years of specialized process expertise across six core product lines.

• H-beam (industrial buildings/multi-story frames) : Precise control of flange width and comprehensive coverage of strength grades make it a fundamental structural support for industrial buildings.
• Box Girder Structure (Super-Tall Buildings/Large-Span Bridges) : Often referred to in the industry as the “Box‑Type King” (referring to heavy‑duty box‑section columns), it boasts exceptional torsional and flexural performance, specifically designed to address highly complex structural challenges.
• Circular tube structure & space frame structure : Used in sports venues, airports, railway stations, and similar facilities. It offers strong structural integrity and can provide large‑span spatial coverage.
• Metal Enclosure System : Roof and wall waterproofing and fireproofing, with a substantial annual production capacity, emphasizing wind-pressure resistance and leak-proof performance.
• Anti-corrosion coating : Comprehensive support across the entire product line, ensuring that steel structures maintain long-lasting durability even in harsh environments.

These six flagship products don’t aim to be “jack‑of‑all‑trades”; instead, they feature process optimizations tailored to specific application scenarios. For project owners, choosing steel construction and selecting the right product line is far more critical than simply driving down costs.

III. How many stages does the “smart manufacturing journey” of a single component go through?

From design drawings to factory shipment, a standard H‑section steel beam undergoes nine core manufacturing processes, which are divided into four stages:

• Phase One: Precision Design

Introduce “ BIM 3D modeling Technology is no longer limited to traditional hand-drawn drafting. Data‑driven automatic generation of fabrication drawings ensures that every hole and every weld is precisely positioned, minimizing errors at the source.

• Phase 2: Molding and Processing

1. CNC cutting ： Laser/intersecting‑line automatic nesting, saving over 15% material.
2. 3D drilling : One clamping, multi‑faceted drilling, with errors kept within the millimeter range.
3. Automatic assembly : Automated equipment for positioning spot welding, enhancing efficiency and reducing manual intervention, Efficiency increased threefold 。

• Phase 3: Core Welding and Processing

1. Robotic welding : Visual tracking of the weld seam, First-time pass rate ≥ 99% . In the past, we relied on seasoned masters to “read the fire”; today, we let the data do the talking.
2. Stress relief : Vibration stress relief or heat treatment is used to release the internal “residual stresses” in the steel. Deformation control is at the millimeter level. 。
3. Shot blasting for rust removal : The surface cleanliness shall meet Sa2.5 grade, which is the foundation for anti-corrosion coating and ensures coating adhesion.

• Phase Four: Protection and Delivery

1. Automated spraying : Online coating thickness monitoring ensures uniform coverage and extends the service life of the structure.
2. Smart warehousing Each component is equipped with an identification tag; it is scanned upon dispatch, ensuring full traceability throughout the process.

In the past, we relied on seasoned masters to “read the flame and trust their intuition”; today, we depend on data, algorithms, and production lines. This isn’t about replacing people—it’s about turning human expertise into standards and transforming those standards into systems.

IV. Why Should Ordinary People Also Pay Attention to Steel Structures?

Prefabricated construction is a national strategy, and steel structures are the “main battlefield” of building industrialization. Over the next decade, China’s annual steel‑structure output is expected to remain above 150 million tons. As a veteran in the industry, my original intention in launching this account is simple:

• Helping homeowners avoid pitfalls: How do you select materials? How do you review construction drawings? What should you look for during inspection and acceptance?
• Helping peers to communicate: How can new processes, new equipment, and new standards be effectively implemented?
• Helping young people enter the industry: Steel structure is not a “blacksmith’s shop”; it is a modern, digitalized, and intelligent manufacturing industry.

We publish one article every week, without resorting to traffic‑driving gimmicks—just straight‑to‑the‑point industry insights.