Ningbo Jiulong Machinery Manufacturing Co., Ltd (NJMM) played a pivotal role in drafting the YB/T4001 Steel Grating Standard in 2019. Unlike standard market offerings, high-quality grating requires precise bar spacing, specialized forge welding techniques, and specific carbon steel grades to ensure optimal load-bearing capacity. For global enterprises, adhering to these standards isn't just about compliance—it's about ensuring life safety on high-altitude platforms.
With a legacy dating back to 1993, NJMM has evolved into a modern comprehensive enterprise integrating scientific research, design, and manufacturing. Our ISO9001, CE, and GHOST certificates are a testament to our technical depth. Operating 12 automated pressure welding lines, we produce over 50,000 metric tons annually, ensuring that every weld meets the rigorous demands of petrochemical and marine industries.
Located in the heart of China’s industrial manufacturing hub, we leverage localized raw material procurement and advanced robotic automation. This allows us to provide significant cost-efficiency without compromising on the metallurgical quality of our steel. Our proximity to major ports ensures that our global shipping logistics are as robust as our products.
Large-scale global enterprises require more than just a product; they require a partner who understands localized application scenarios and regulatory frameworks. NJMM provides comprehensive engineering support, from initial design drawings to onsite installation guidance. Whether it's the specific anti-slip requirements of North Sea offshore rigs or the ventilation standards of Middle Eastern refineries, our grating solutions are engineered for the environment.
| Region | Key Standard Compatibility | Preferred Application |
|---|---|---|
| Europe | CE / EN ISO 14122 | Industrial Walkways & Stair Treads |
| USA / Canada | ANSI / NAAMM (MBG 531) | Power Plant Platforms |
| China / Asia | YB/T 4001.1-2019 | Petrochemical & Mining |
| Russia / CIS | GHOST Certification | Heavy Industrial Infrastructure |
In an era of global uncertainty, NJMM offers stability through our dual-production base strategy in East and North China. Our 12 auto-welding product lines are supplemented by laser cutting and digital control tailoring, ensuring that custom shapes and irregular grating fabrications are delivered with the same speed as standard panels. We mitigate supply chain risks by maintaining massive inventories of raw steel, ensuring fast delivery even during peak demand cycles.
Where NJMM Grating Standards Define Safety and Durability
Recommended: JG255/30/100, JG325/30/100. These gratings offer superior ventilation, lighting, and heat dissipation while being explosion-proof. The hot-dip galvanization ensures a 30+ year lifespan in corrosive environments.
Recommended: JG705/30/100, JG1008/30/100. Designed for extreme loading conditions, these heavy-duty bars handle forklift traffic and massive static loads in port logistics hubs and mining refineries.
Applications: Ditch covers, ceiling panels, and ventilation screens. Our steel grating trench covers consume 30% less material than cast iron while providing superior drainage and modern aesthetic appeal.
The industry is moving toward Building Information Modeling (BIM). NJMM is at the forefront, providing detailed 3D CAD drawings that integrate directly into our clients' architectural models, reducing on-site errors and installation time by 40%.
In 2021, NJMM obtained the "Green Factory" certification. We are optimizing our galvanization processes to reduce waste and implementing energy-efficient robotic welding to minimize our carbon footprint, meeting the ESG requirements of our global partners.
With 6 sets of automatic banding robots and self-developed pressure welding lines, our manufacturing process reduces human error, ensuring every bar is perfectly aligned and every weld is deep and consistent.
Founded in 1993, NJMM is a leader in the design and manufacturing of steel grating, railings, and light steel structures. We operate two massive production bases in East and North China, featuring 12 automated welding lines. With an annual output exceeding 50,000 metric tons, we are a key supplier to global markets including South America, Europe, Oceania, and the Middle East. Our "Longta" brand is synonymous with quality in China's most renowned engineering projects.
Vision: To be the leader in the steel grating market, the preferred supplier, and a good corporate citizen.
Mission: To provide top-quality products & services with global expertise; to build a harmonious environment for employees; and to contribute to the advancement of both industry and society.
Jiulong
