Since 1993, NJMM has been engineering world-class steel gratings, railings, platforms, and light steel structures — trusted by global industries across 6 continents.
Ningbo Jiulong Machinery Manufacturing Co., Ltd (NJMM) was founded in 1993, and is mainly engaged in the design and manufacturing of steel grating, railings, platforms and other light steel structures. It is a modern comprehensive enterprise integrating scientific research and design, machinery manufacturing and engineering construction.
We currently have 2 production bases in the East and North of China, featuring 12 steel grating auto welding product lines, as well as complete auxiliary processing equipment and testing facilities — including robotic welding, laser cutting, and digital control panel tailoring. Our annual output of steel gratings and allied products, including trench covers, stair treads, stanchions, handrails, and fences, is over 50,000 metric tons.
NJMM offers engineering service and support, including the design and installation of grating solutions and the provision of detailed drawings if required. NJMM is committed to a continuous process to enhance customer service through product quality and delivery. NJMM has obtained the ISO9001 Quality System Certificate, CE certificate, GOST certificate and other international certificates.
Three core pillars that define NJMM's industry-leading position in steel grating manufacturing and global supply.
NJMM currently has two production bases, covering an area of 450,000 m² and workshop area of 30,000 m². With 12 self-developed automatic pressure welding equipment lines, 6 sets of automatic banding robots, and 2 sets of irregular grating fabrication platforms. The annual production capacity of steel grating, stair tread, trench cover, stanchion and steel structures is over 50,000 tons, of which more than 20,000 tons is for exporting.
NJMM has obtained ISO9001:2015 Quality Management System Certification, ISO45001:2018 Occupational Health System Certification, ISO14001:2015 Environmental Management System Certification, and CE certification. We participated in drafting and revising the steel grating standard YB/T4001 in 2019. In 2020, we successfully declared a high-tech enterprise and municipal engineering center. In 2021, we obtained the Green Factory designation.
NJMM markets its products mainly to South America, Europe, Oceania, Africa, West Asia, Southeast Asia, the Middle East and other countries worldwide. Domestically, its marketing and service scope has covered all provinces nationwide, and "Longta" steel grating has been widely applied to numerous renowned projects across China.
To be the leader in the steel grating market, the preferred supplier, and a good corporate citizen — setting the global standard for quality, reliability, and sustainable manufacturing.
To provide top quality products and services with global expertise. To build a harmonious environment for employees growing together with the company. To contribute to the advancement of both industry and society through innovation and responsibility.
Participated in drafting and revising the national steel grating standard YB/T4001 (2019). Declared a High-Tech Enterprise and Municipal Engineering Center (2020). Awarded Green Factory status and included in the cultivation pool of specialized and innovative enterprises (2021).
Two strategically located production bases equipped with the most advanced automated steel grating manufacturing technology in China.
12 self-developed automatic pressure welding equipment lines, 6 sets of automatic banding robots, and 2 sets of irregular grating fabrication platforms enable NJMM to deliver precision-engineered steel gratings at unmatched speed and consistency.
Integral quality control and inspection facilities with rich experience to provide high-quality products, backed by multiple international certifications.
NJMM holds a comprehensive portfolio of internationally recognized quality, safety, and environmental management certifications — assuring buyers worldwide of our unwavering compliance.
From forge-welded bar grating to galvanized stair treads and pipe railings — NJMM offers a comprehensive range of industrial steel grating solutions engineered for durability and performance.
NJMM steel gratings are widely used across petrochemical, light chemical, mechanochemical, textile chemical, refinery, and many other demanding industries globally.
Widely used in petrochemical industry, light chemical industry, mechanochemistry, textile chemical industry, and refineries. Recommended products: JG255/30/100, JG325/30/100, JG405/30/100.
Anti-Skid Explosion-Proof Ventilation
Widely used in port terminals, steel industry, mining and refining, shipbuilding, military engineering, airport engineering, and offshore engineering. Recommended: G505/30/100, JG705/30/100, JG806/30/100.
High Load Drainage Durable
Widely used in oil chemical, agriculture, gardens, food processing, aquaculture, pharmaceutical, parking lots, waterworks, sewage disposal, paper, construction, transportation, and boiler manufacturing.
Free Maintenance Easy Install Modern Style
NJMM markets its products mainly to South America, Europe, Oceania, Africa, West Asia, Southeast Asia, the Middle East and other countries in the world. Domestically, its marketing and service scope has covered all provinces nationwide, and "Longta" steel grating has been widely applied to numerous renowned projects across China.
NJMM steel gratings have been successfully deployed in hundreds of landmark industrial and infrastructure projects worldwide, delivering proven performance in the most demanding environments.
NJMM forge-welded steel gratings provide safe, durable, and corrosion-resistant platform walkway solutions for petrochemical and heavy industrial facilities, meeting the most stringent load and safety requirements.
Our heavy-duty trench covers and equipment protection gratings are engineered for ports, steel mills, and mining facilities, offering superior load capacity, drainage function, and minimal maintenance requirements.
NJMM's galvanized stair treads and pipe railing systems are widely used in industrial buildings, oil refineries, and public infrastructure, combining anti-slip safety with long-lasting hot-dip galvanized corrosion protection.
NJMM has established long-term partnerships with leading enterprises and project owners across the world, reflecting our unwavering commitment to quality and reliability.
Contact NJMM today for a customized quote, technical drawings, or to download our full product catalog. Our engineering team is ready to support your project from design to delivery.
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Jiulong
