Ningbo Jiulong Machinery Manufacturing Co., Ltd (NJMM), established in 1993, represents the pinnacle of Chinese industrial steel fabrication. For over three decades, we have defined the standard for high-quality GI (Galvanized Iron) grating across the globe. As a modern comprehensive enterprise, we integrate scientific research, precision design, automated manufacturing, and large-scale engineering construction.
Operating from two massive production bases in East and North China, our infrastructure includes 12 automated steel grating pressure-welding lines, robotic welding stations, and state-of-the-art laser cutting systems. Our annual output exceeds 50,000 metric tons, serving critical infrastructure in over 30 countries.
In the global procurement landscape, understanding GI grating standard sizes is critical for structural integrity and cost-efficiency. "GI Grating" (Galvanized Iron Grating) typically refers to hot-dip galvanized carbon steel grating, designed to resist corrosion in harsh environments.
Standard panel sizes usually include 1000mm x 5800mm or 1000mm x 6000mm. However, bar spacing is the true differentiator:
We utilize Q235B carbon steel, which undergoes a rigorous Hot-Dip Galvanization process according to ISO 1461, ensuring a coating thickness of at least 65-85 microns for long-term durability.
Our engineering team provides detailed span tables. Whether you require pedestrian traffic (5kN/m²) or heavy vehicle access (H-20 loading), NJMM gratings are calculated to exceed safety factors by 1.5x.
China's dominance in the GI grating sector isn't just about price; it's about integrated supply chain excellence. NJMM leverages the local availability of raw steel and high-volume galvanizing pools to offer lead times that Western manufacturers cannot match. Furthermore, our adoption of AI-driven digital control panel tailoring reduces material waste by 15%, a saving passed directly to our global partners.
In corrosive maritime environments, our JG255/30/100 and JG405/30/100 series offer superior ventilation and explosion-proof properties. Our hot-dip process ensures minimal maintenance for offshore oil rigs.
Modern "Sponge Cities" use our trench covers for efficient drainage. The high open-area ratio prevents flooding while maintaining a high aesthetic standard for urban walkways.
The industry is shifting toward Green Manufacturing. NJMM is proud to be a "Green Factory," utilizing recycled water systems and energy-efficient welding robots to reduce carbon footprints.
Global enterprises, particularly in Europe and South America, are increasingly looking for CE and ISO 9001 certified suppliers to mitigate risk. A reliable manufacturer must provide:
1. Full Traceability: Raw material certificates for every batch.
2. Quality Assurance: Load testing reports and galvanization thickness verification.
3. Logistical Expertise: Efficient packing to prevent damage during sea freight.
Essential for refineries and chemical plants. NJMM grating provides anti-slip serrated surfaces for maximum worker safety.
Heavy-duty solutions for port terminals and airports, designed to withstand rolling loads and high-velocity water runoff.
Modern architectural applications include ventilation screens and equipment protection, balancing aesthetics with airflow.
NJMM is a certified high-tech enterprise with ISO9001:2015, ISO45001:2018, and CE credentials. Our products are the preferred choice for petrochemical, refinery, and mining leaders globally.
Jiulong
