Explore our heavy-duty steel structure products, featuring state-of-the-art galvanizing and precise automatic pressure welding.
How Modern Pre-Engineered Steel Pan Staircases Are Replacing Traditional In-Situ Methods to Minimize Site Labor and Maximize Lifespan.
The construction industry is experiencing a profound paradigm shift towards pre-manufactured structural components. Globally, steel stair pans for concrete have transitioned from simple metal formwork to highly engineered, integrated architectural subsystems. As building heights increase and project schedules compress, the demand for off-site fabricated steel stair pans has scaled exponentially. Concrete contractors and precast suppliers rely on these structures as they offer an immediate, secure walkway during high-rise structural execution, eliminating the need for temporary wooden scaffolding.
Modern developments in metallurgy and robotic manufacturing processes allow suppliers to fabricate stair pans with tight tolerances, ensuring seamless alignment and concrete pour efficiency. Pre-galvanized and hot-dip galvanized steel components have become standard requirements to combat corrosion, especially in infrastructure projects, commercial centers, and coastal areas. By offering a dual benefit—providing a mechanical container for concrete fill and establishing structural integrity via steel reinforcements—stair pans optimize both structural weight and construction velocity.
Modern steel stair pans are engineered with textured internal walls, strategically placed metal ribbing, or welded shear studs. This design prevents concrete shear slippage inside the pan under cyclic loading, significantly improving acoustic dampening and high-traffic load distribution compared to traditional flat-metal pans.
A Modern Comprehensive Leader in Steel Grating, Stair Treads, Platforms, and Light Steel Structures Since 1993.
Ningbo Jiulong Machinery Manufacturing Co., Ltd (NJMM) was founded in 1993 and is primarily engaged in the design, engineering, and advanced manufacturing of steel grating, structural handrails, platform systems, and customizable steel stair treads. We integrate scientific research, architectural design, high-precision manufacturing, and global logistics support into a cohesive end-to-end operation.
Operating from two modern production bases in East and North China, our facilities encompass over 450,000 square meters of land with a 30,000 square meter dedicated workshop layout. NJMM is equipped with 12 self-developed automatic pressure welding equipment lines, 6 sets of automatic banding robots, and 2 sets of irregular grating fabrication platforms. This scale yields an annual output of over 50,000 metric tons of structural steel products, including trench covers, stair treads, stanchions, handrails, and fences.
We offer robust engineering services, from design configuration and stress-load calculations to detailed shop drawing provisions. Committed to continuous process enhancement, NJMM has attained prestigious global credentials, including the ISO9001:2015 Quality Management System Certification, ISO45001:2018 Occupational Health System Certification, ISO14001:2015 Environmental Management System Certification, CE, and GOST certificates.
Addressing the challenges of bulk supply chains, international engineering compliance, and localized installation requirements.
We ensure all manufactured products align with global ASTM, EN, BS, and YB/T4001 industrial grating standards. In 2019, NJMM actively participated in drafting and revising the Chinese Steel Grating Standard YB/T4001, highlighting our industry leadership.
Corrosion mitigation is vital. Our hot-dip galvanizing process conforms to ISO 1461, ensuring thick, uniform protective coatings that shield against atmospheric hazards in heavy chemical and marine environments.
Under equivalent load requirements, steel stair pans require less support steel than cast-in-place concrete structures, reducing the overall foundation load and optimizing budget layouts for high-rise commercial framing.
Rigorous global compliance checks verify our performance, durability, and craftsmanship.
At NJMM, quality is our guiding principle. We maintain ISO9001:2015 (Quality), ISO45001:2018 (Occupational Health), and ISO14001:2015 (Environmental Management) standards. Our structural materials are CE and GOST certified, proving compliance with European and Eurasian Economic Area standards.
In 2020, NJMM was recognized as a municipal engineering center and high-tech enterprise. In 2021, we were designated a Green Factory and selected for the specialized and special new enterprise cultivation pool. Every manufacturing step—from steel slitting and automatic forge-welding to zinc galvanizing—is documented and checked for quality.
Our galvanized structures and stair pans perform reliably in demanding and corrosive environments.
Widely used in the petrochemical, light chemical, mechanochemistry, and refinery sectors. The harsh conditions in these industries require structures that provide maximum ventilation, ambient lighting, heat dissipation, and slip resistance.
Recommended Products: JG255/30/100, JG325/30/100, JG405/30/100, and customized JT series steel stair treads.
Key Advantages: Rapid on-site assembly, zero dynamic processing requirements, robust safety features, and a maintenance-free finish that reduces operational downtime.
Essential for port terminals, mining, refining, shipbuilding, military engineering, airports, and offshore platforms. These structural panels must support heavy wheel loads and dynamic stresses.
Recommended Products: G505/30/100, JG705/30/100, JG806/30/100, JG1008/30/100, and heavy-duty structural stair pans.
Key Advantages: High load-bearing capacity, open grid architecture that prevents debris accumulation, and hot-dip galvanized protection against salt spray corrosion.
Used in agriculture, food processing, aquaculture, parking facilities, cement plants, waterworks, and paper mills. Cleanliness, corrosion resistance, and low wind resistance at high altitudes are critical in these sectors.
Key Advantages: Lightweight profile, aesthetic design suitable for architectural applications, low wind resistance, and excellent anti-slip properties.
Advancing structural steel fabrication through digital integration and sustainable practices.
As global construction moves toward net-zero targets and smart pre-fabrication, NJMM is positioning its product roadmap to support green building practices. We are investing in automated assembly lines and digital modeling to improve precision and sustainability.
Our research focuses on three core areas:
NJMM supplies components to major engineering enterprises worldwide, delivering reliable performance across diverse markets.
Detailed engineering answers regarding stair pans, concrete integration, load capacities, and quality standards.
For typical commercial and industrial stairs, 14-gauge to 12-gauge carbon steel is recommended to prevent deflection during the concrete pour. In heavy-duty or wide spans, 10-gauge structural sheet metal or reinforced structural channels are specified to withstand high traffic loads before and after concrete placement.
Fresh concrete can react with zinc, generating thin hydrogen gas bubbles that may affect initial adhesion. To prevent this, our galvanized structural stair pans are treated with a passivating agent, or specified with mechanical anchors, cross-bar welds, and textured patterns to ensure a strong mechanical bond.
Our JT product series covers different design variations. Standard models like JT1 use plain bearing bars with standard side plates, while JT2 features slip-resistant nosing, and JT3 through JT8 provide configurations such as welded or bolted nosing, serrated bars for greasy industrial sites, and custom side configurations for easy installation on structural steel stringers.
We provide comprehensive architectural shop drawings, calculations, and engineering consulting services. All structural parameters conform to international standards such as CE EN 1090, ASTM A123 (for hot-dip galvanizing), and local building codes, facilitating smooth approvals by local regulators and engineers.
Typical production schedules range between 2 to 4 weeks depending on the order volume and design complexity. Utilizing our 12 automated welding lines and robotic cutting machinery allows us to meet tight deadlines for large-scale infrastructure projects.
Premium architectural metal items, featuring industrial pipe railings, aluminum grating panels, and serrated safety components.
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