Explore our premium, CE-certified structural steel components manufactured to satisfy rigorous international industrial safety guidelines.
In modern industrial architectural design, safety, durability, and load-bearing performance are paramount. Grate stair treads are not merely pedestrian components; they are core safety structures designed to withstand extreme dynamic loading, highly corrosive environments, and harsh weather conditions. To ensure safety across high-risk sectors like offshore oil platforms, chemical plants, and multi-level mining structures, adherence to international certifications—particularly the CE Certification (EN 1090-1 / EN ISO 14122)—is non-negotiable.
As a leading pioneer in high-capacity forge-welding and structural light steel components, Ningbo Jiulong Machinery Manufacturing Co., Ltd (NJMM) has set the benchmark for global supply chains. Established in 1993, NJMM combines decades of metallurgical experience with automated robotic manufacturing. This technical whitepaper explores the design parameters, fabrication standards, localized applications, and supply efficiencies that drive modern industrial grating procurement.
Execution in absolute compliance with EN ISO 14122 (Safety of machinery - Permanent means of access to machinery), ANSI/NAAMM MBG 531, and YB/T 4001. NJMM led the drafting and revision of the domestic YB/T4001 steel grating standard in 2019, securing its place as an authority.
Our structural grating solutions hold full CE Marking, ISO9001:2015 Quality Management System Certification, ISO14001:2015 Environmental, and ISO45001:2018 Occupational Health Systems, guaranteeing zero-defect material sourcing and structural reliability.
A premier global manufacturer driving innovation in heavy-duty industrial grating and structural safety platforms.
Ningbo Jiulong Machinery Manufacturing Co., Ltd (NJMM) is a modern comprehensive enterprise integrating scientific research, product design, precise machinery manufacturing, and engineering construction. Operating from two state-of-the-art production bases in Eastern and Northern China, NJMM runs 12 automated steel grating pressure welding lines, supplemented by cutting-edge robotic welding stations, laser cutting machinery, and digital control panel tailoring platforms.
Our extensive portfolio spans high-performance steel grating, custom industrial handrails, safety stanchions, trench drainage covers, and structural stair treads. With over 20,000 metric tons of our annual output exported directly to markets across South America, Europe, North America, Oceania, the Middle East, and Southeast Asia, our "Longta" brand has earned massive prestige in worldwide infrastructure projects.
Utilizing proprietary automated systems and strategic logistics hubs near Ningbo Port, we minimize delivery lead times. Our extensive service network supports global project delivery across all major maritime hubs.
Our workshops feature 6 sets of automated banding robots and 2 sets of irregular grating fabrication platforms to handle highly complex geometries. Every square meter of grating undergoes precise dimensional checks and loading audits before dispatch.
In structural design, stair treads are classified by their mounting type (welded vs. bolted connection) and the style of their slip-resistant nosing. Selecting the correct configuration is critical to preventing worker fatigue, eliminating falls, and minimizing long-term structural maintenance.
NJMM's proprietary JT Series (JT1 to JT8) is designed to offer specialized configurations for all industrial structures:
| Model Series | Installation Type | Nosing Configuration | Ideal Application Scenario |
|---|---|---|---|
| JT1 | Welded Connection | No Nosing (Plain Edge) | Permanent structures with low pedestrian volume where direct structural integration is needed. |
| JT2 | Bolted Connection (End Plates) | No Nosing (Plain Edge) | Modular frames requiring easy installation, replacement, and access to underlying utility pipes. |
| JT3 | Welded Connection | Checkered Plate Nosing | High-traffic walkways requiring enhanced visibility on the leading edge and a rigid welded structure. |
| JT4 | Bolted Connection (End Plates) | Checkered Plate Nosing | Standard global industrial standard configuration; combines high safety with rapid modular assembly. |
| JT5 | Welded Connection | Vertical Strip Nosing | Harsh environments where snow, debris, or heavy mud could build up on standard checkered plates. |
| JT6 | Bolted Connection (End Plates) | Vertical Strip Nosing | Walkways in aggregate processing plants, mining sectors, and heavy outdoor platforms. |
| JT7 | Welded Connection | Anti-slip Slotted Plate Nosing | Ultra-slippery zones such as offshore drilling platforms, marine transit ports, and oil refineries. |
| JT8 | Bolted Connection (End Plates) | Anti-slip Slotted Plate Nosing | Extreme slip-resistance needs combined with modular bolt-on structure for simple crane hoisting. |
The structural layout of our stair treads is optimized to balance self-weight against load-carrying capacity. Here are the core technical advantages designed into our grating products:
From petrochemical refineries to deep-sea platforms, our certified grating stands up to the most demanding industrial challenges.
Industrial installations have varying demands based on location, environmental exposure, and safety standards. Below is an overview of how NJMM platforms are used globally:
Highly volatile chemical processing calls for explosion-proof, non-sparking, and well-ventilated walking surfaces. Recommended specifications: JG325/30/100 or JG405/30/100 hot-dip galvanized steel grating.
Marine environments require resistance to salt spray and heavy sea loads. High-density galvanization and serrated steel profiles prevent corrosion and slipping on wet, rolling decks.
Wastewater treatment plants require clean, self-draining covers that resist biological and chemical corrosion. Grating panels prevent debris buildup while offering high loading capacity for maintenance vehicles.
Sourcing structural steel grating on a global scale requires balancing high manufacturing capacity with strict quality control. China remains a global leader in steel fabrication, and NJMM is strategically positioned to deliver maximum value for international projects:
Our primary production facilities are located near Ningbo Port, one of the largest shipping hubs in the world. This allows for direct container loading, streamlined customs clearance, and reduced land freight costs, ensuring timely international deliveries.
Our 12 automated pressure welding lines use computer-controlled high-frequency resistance welding. By combining over 200 tons of hydraulic force with a 1,600 kVA electric current, the crossbars and bearing bars are fused into a single rigid structure, eliminating gaps and weld defects.
This automated approach minimizes material waste and ensures consistent dimensions across high-volume production runs. Whether executing standard specifications or custom orders with complex shapes, NJMM provides reliable lead times and consistent product quality.
Get answers to common technical, design, and compliance questions about industrial steel grating and stair treads.
Our factory processes and materials are audited and certified by leading international testing bodies.
Our steel grating and structural products are approved by major contractors and engineering firms worldwide.
Complete your platform specifications with our matching handrails, grating panels, and mounting accessories.
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