Premium steel reinforcement, carbon structural bars, and heavy-duty structural components engineered for high-load applications.
The industrial region of Kawachi has emerged as a crucial node in the modern manufacturing and heavy industrial supply chain. Known for its sophisticated manufacturing facilities and robust logistical networks, Kawachi hosts a thriving metalworking sector where Prime Hot Dipped Galvanized Steel Coils play a foundational role. As global infrastructure demands escalate, local factories in Kawachi have integrated advanced AI-driven manufacturing systems, optimizing the hot-dip galvanization process to meet rigorous international standards such as ASTM, EN, and JIS.
Hot-dip galvanization involves coating structural carbon steel with a protective layer of zinc by submerging the metal in a molten bath of zinc at temperatures around 450°C. This metallurgical reaction creates a series of zinc-iron alloy layers that provide unparalleled barrier protection and sacrificial galvanic protection. In Kawachi's humid and coastal-adjacent environments, this corrosion resistance is vital for preventing rust and ensuring the longevity of public infrastructure, automotive frameworks, and agricultural systems.
Thick zinc coating (Z275 and above) offers decades of protection against atmospheric moisture, chemical exposure, and maritime humidity.
Optimized steel substrate chemistry allows for deep drawing, bending, and roll-forming without peeling or cracking the zinc layer.
Kawachi factories utilize computerized visual inspection systems to monitor spangle size, coating thickness, and surface roughness in real-time.
Today's galvanized steel market is heavily influenced by the transition toward green manufacturing and carbon neutrality. Factories in Kawachi are actively adopting eco-friendly passivation treatments, eliminating hexavalent chromium in favor of trivalent chromium and organic coatings. Additionally, the development of Zinc-Aluminum-Magnesium (ZM) alloy coatings represents a major leap forward, offering up to three times the corrosion resistance of traditional galvanized coatings with thinner layers, reducing overall raw material consumption.
Furthermore, local supply chain integration is shifting from simple raw material trade to deep customization. Manufacturers are no longer just delivering standard coils; they are providing tailored slitting, leveling, and pre-punching services. This ensures that the steel arrives at construction sites or automotive assembly lines ready for immediate integration, minimizing waste and maximizing processing efficiency.
Transforming from traditional steel merchants to leading supply chain service providers.
Since its establishment, based on the steel service industry, with a pragmatic attitude and steady pace, ZZ Group (short for Zhanzhi Group) has gradually completed the transformation from a traditional steel merchant to a steel supply chain service provider. I would like to express my heartfelt thanks to the new and old customers who have always supported ZZ Group and colleagues who have been silently dedicated to ZZ Group!
In the current environment of the steel industry, ZZ Group continues to adhere to its main business, adheres to the business philosophy of "integrity, pragmatism, innovation, and win-win", and adheres to the work policy of "grasp the atmosphere, have ideas, summarize, attach importance to people, and have no doubts". We pay close attention to internal management, establish a style of dedication, diligence, hard work, and dedication; advocate innovation consciousness, emancipate the mind, and make bold innovations; develop a good habit of summarizing and make continuous progress. Attaching importance to talents, we strive to find professionals with consistent values to join ZZ Group, pay attention to the learning and training of employees, and promote their growth. In this era of meager profits, we recognize the situation, seize opportunities, and accumulate solidly bit by bit. ZZ Group puts the customer's needs in the first place, meeting their greatest needs as the starting point of our service work.
ZZ Group adheres to the concept of creating value through service, vigorously promoting employee growth and business innovation. ZZ Group will further transform into deep processing, strive to become a parts manufacturer in various industries, and leap to a better tomorrow. We look forward to more people looking forward to the future of ZZ Group, and we are willing to build long-term ambitions with our partners globally.
A legacy of growth, adaptation, and technological transformation in the global steel market.
Segment customers, improve terminal quality.
Increase technical services, promote service specialization.
Promote industrial extension and business upgrading.
Deepen the transformation and optimize processes.
Training and enrolling high-caliber technical talents.
Promote professional customer service to a strategic height.
Stick to main-business and focus on services.
Delving deep into high-grade steel processing.
Seek structural transformation across regional lines.
Headquartered in Shanghai, expanding from regional to transregional.
Establish our own comprehensive Steel Trade-Process-Distribution system.
March into the North-west China market.
Acting as primary agents for leading domestic steel mills.
Break through among fierce industry competition.
Steel scraps, recyclable steel materials mainly applied in the Automobile industry.
Equipped with state-of-the-art automated leveling and shearing production lines to deliver precision steel products.
ZZ Group operates 6 advanced warehousing and processing centers strategically distributed across major industrial hubs (with 2 additional processing plants currently in preparation). These facilities are equipped with a total of 30 automatic cold and hot rolling and shearing production lines from first-line global brands, providing comprehensive processing solutions:
Comprehensive steel product lines manufactured to meet global industrial, architectural, and mechanical requirements.
How our custom steel processing services cater to key economic sectors in Kawachi and beyond.
Definition: Infrastructure development including real estate, energy infrastructure, housing construction, roads, bridges, tunnels, industrial plants, and heavy steel structure installation engineering.
Common Grades: Weathering Steel Series Q355NQ, Q420GNQ; Wear Resistant Steel Series NM450, HARPOX450; Hot Rolled Coil Series Q460C; Hot Rolled Structural Steel Series QSTE550TM, HR360LA; Flower Galvanized Series DX51D+Z(ZF); Bridge Steel Series Q420qD; Acid Resistant Steel Series 09CrCuSb.
Definition: Steel products specifically processed for commercial and residential buildings, including door and window manufacturing, bridge frames, ventilation ducts, civil defense systems, fire protection engineering, and curtain wall accessories.
Common Grades & Products: Hot-rolled coil series Q215A, Q235B, Q275C; low alloy series Q355C; section steel series (I-beam, angle steel, channel steel) Q215B, Q235B, Q275B, 10#~70# steel; hot-dip galvanized series DX51D+Z; Galvalume series DX51D+AZ; High-strength structural steel series S550GD+Z, S350GD+AZ.
Definition: Structural and aesthetic steel components for passenger vehicles and commercial trucks.
Common Grades: Beam Steel Series 700L, 610L; Pickling Automotive Structural Steel Series SAPH440, SPFH590, S500MC, ST52-2, QSTE550TM; Hot Formed Steel Series BR1500HS; Cold Rolled Mild Steel Series DC01, DC03, SPCC, BLC; Cold Rolled Automotive Structural Steel Series HC380LA, SPFC590, HC380/590DP, HC420/780HE; Advanced High Strength Steel (AHSS) DP, MS, TR, CP, HE, QP.
Definition: High-precision sheet metals used for major appliances, small appliances, kitchenware, bathroom fixtures, digital casings, and computer manufacturing.
Common Grades: Cold-rolled low carbon steel series DC01, SPCC, ST12; zinc-aluminum-magnesium series DC51D+ZM, SCS400; galvanized series DC53D+Z; galvalume series DC51D+AZ; zinc-iron alloy series DC52D+ZF; electro-galvanized series SECC, DC03+ZE.
Definition: Structural materials for fixed facilities in rivers, lakes, and oceans, including shipyards, offshore drilling platforms, and marine support structures.
Certifications & Grades: Certified by leading global classification societies: CCS, BV, ABS, LR, DNV, GL, RINA, NK, KR. Common grades include CCSA, CCS-A36, BVA, AH32, AB/A, AB/AH36, NVA, NVA32, GLB, GL-A36, AH36, KA/KB/KD, KA32/KB36, A/B/C, AH32/AH36.
Definition: Steel components designed for industrial machinery, reducing labor intensity and increasing manufacturing efficiency (construction machinery, petrochemical equipment, hoisting systems, and environmental protection hardware).
Common Grades: Hot rolled structural steel plate series Q235B, Q355D, ST37-3, SPHC; round steel series 40Cr, 50CrVA, QSTE420TM, 10#~70# steel, 65Mn, ML15AL.
Definition: Steel for custom metal manufacturing, hand tools, metal packaging containers, daily hardware, furniture frames, storage racks, and electrical control cabinets.
Common Grades: Cold Rolled Coil Series DC01, SPCE, BLD; Galvanized Series DC53D+Z; Galvalume Series DC51D+AZ; Zinc Aluminum Magnesium Series DC51D+ZM, SCS400; Stainless Steel Series 201, 304, 316L, 430.
Explore our core product portfolio, including rebar, weathering plates, carbon bars, and high-performance cold-rolled coils.