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Help CenterSteel Pipe & Tube & Galvanized Steel Pipe，Q195、Q235B、Q355B、ASTM A53 Gr.A、ASTM A53 Gr.B
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Galvanized Steel Pipe refers to hollow metal pipe made of carbon‑steel welded or seamless base pipe with inner‑outer galvanized anti‑corrosion treatment. Solving the pain points of easy rusting and short service life for ordinary black steel pipe, Galvanized Steel Pipe features outstanding rust‑proof & corrosion‑resistant performance, reliable sealing, stable pressure‑bearing capacity and convenient welding & fabrication, serving as widely‑used basic pipe material for municipal fluid transmission, fire‑fighting water supply & drainage, greenhouse steel structures, guardrail supports and engineering scaffolding projects. Galvanized Steel Pipe is mainly divided into Hot‑Dip Galvanized Steel Pipe and Electro‑Galvanized Steel Pipe. Different process & specifications of Galvanized Steel Pipe adapt to fire‑fighting pipe network, municipal water supply, agricultural greenhouse, steel‑structure supports, low‑pressure fluid conveyance and other working conditions. With complete sizes and original mill certificates available, Galvanized Steel Pipe supports fixed‑length cutting, pipe threading, grooving and passivation deep‑processing. With strong zinc‑layer adhesion and long anti‑corrosion service life, Hot‑Dip Galvanized Steel Pipe is the most versatile Galvanized Steel Pipe for outdoor and humid‑condition projects. Featuring bright surface,Electro‑Galvanized Steel Pipe is mostly applied for indoor structural components under low‑corrosion environment. Conventional nominal diameter of Galvanized Steel Pipe ranges DN15‑DN300, wall thickness 1.2‑12mm, standard length 6m. Main grades include Q195, Q235B, Q355B, A53 Gr.A/B. Every piece passes hydrostatic test, visual inspection and zinc‑coating thickness test before delivery. All Galvanized Steel Pipe comply with GB/T3091‑2015 national standard as well as ASTM A53, EN10255 international standards. Enterprises for municipal engineering, fire‑protection installation and steel‑structure construction can select Hot‑Dip Galvanized Steel Pipe and Electro‑Galvanized Steel Pipe according to conveyed medium, service environment and pressure grade, giving full play to advantages of anti‑corrosion durability, easy installation and high cost‑performance of Galvanized Steel Pipe to guarantee long‑term stable operation of fluid‑transmission and steel‑structure projects.
1. Material Grade & Model
Common Galvanized Steel Pipe Grades: Q195, Q235B, Q355B, ASTM A53 Gr.A, ASTM A53 Gr.B
Hot‑Dip Galvanized Steel Pipe Models: DN15‑DN300, available for threading, grooving, fixed‑length cutting and passivation, suitable for fire‑fighting piping, municipal water supply, greenhouses, scaffolding and outdoor steel structures;
Electro‑Galvanized Steel Pipe Models: DN15‑DN150 with bright surface finish, for indoor guardrails, equipment supports and low‑corrosion structural components; All grades comply with GBT3091‑2015 national standard for galvanized welded steel pipes for low‑pressure fluid conveyance, also satisfying ASTM A53 and EN10255 foreign‑trade standards. Custom zinc‑coating thickness is supported, and full‑set original‑mill quality documents can be provided.
2. Product Grades and Classification
- Hot‑Dip Galvanized Steel Pipe: Produced by hot‑dip zinc immersion, thick zinc coating with strong adhesion and excellent anti‑corrosion performance, suitable for outdoor, humid and buried harsh working conditions
‑ Electro‑Galvanized Steel Pipe: Electro‑plating process with thin zinc layer and bright appearance, only for dry indoor environment, not recommended for buried or long‑term outdoor exposure ‑ Base Material: ERW welded galvanized pipe, seamless galvanized pipe for different pressure‑bearing requirements
‑ Compliance Standards: GB national standard, ASTM American standard, EN European standard, suitable for domestic mechanical‑fire‑protection engineering and import‑export trade orders
3. Execution Standards
- GB/T 3091‑2015 Welded steel pipes for low‑pressure fluid conveyance
‑ GB/T 13912‑2020 Metallic coatings‑Hot‑dip galvanized coatings on fabricated iron and steel articles
‑ ASTM A53/A53M Standard specification for welded and seamless carbon‑steel pipes
‑ EN 10255 Non‑alloy steel tubes suitable for welding and threading
‑ Original mill certificates, hydrostatic‑test reports and zinc‑coating inspection reports are available, supporting SGS/BV third‑party authoritative inspection & acceptance.
4. Core Specifications and Parameters
Galvanized Steel Pipe ‑ Hot‑Dip Galvanized Steel Pipe: Nominal diameter DN15‑DN300; Wall thickness 1.2‑12mm; Standard length 6m; Welded / seamless base material; for fire‑fighting water supply‑drainage, municipal water supply, agricultural greenhouses, scaffolding and outdoor steel structures;Galvanized Steel Pipe ‑ Electro‑Galvanized Steel Pipe: Nominal diameter DN15‑DN150; Wall thickness 1.0‑6mm; Standard length 6m; ERW welded base material; for indoor guardrails, equipment supports and indoor component fabrication; Full‑series Galvanized Steel Pipe supports fixed‑length cutting, pipe threading, grooving processing and passivation anti‑rust treatment.Hot‑Dip Galvanized Steel Pipe features stable supply, firm anti‑corrosion zinc layer and sufficient stock resources, suitable for mass‑volume outdoor fluid‑transmission and steel‑structure engineering projects;Electro‑Galvanized Steel Pipe delivers bright smooth surface and economic cost, suitable for structural‑component fabrication under dry indoor environment.
5. Classification & Performance Characteristics
- Hot‑Dip Galvanized Steel Pipe: Pipe substrate is immersed in molten zinc liquid for hot‑dip galvanizing. Zinc‑iron alloy layer forms metallurgical bonding with steel base, coating hardly peels off, owning outstanding salt‑spray resistance and anti‑rust performance. It can be buried or exposed outdoors, available for welding, threading and grooved connection, widely adopted in fire‑fighting, water‑supply and agricultural‑greenhouse projects.
- Electro‑Galvanized Steel Pipe: Zinc coating is formed by electro‑plating process with bright smooth surface but thin coating and limited anti‑corrosion capacity. It is only fit for dry indoor environment, not for buried or long‑term outdoor service.
- Delivery State: finished galvanized pipe; pipe threading, grooving, plastic‑end‑cap protection and passivation anti‑rust treatment are optional;
‑ Both Hot‑Dip Galvanized Steel Pipe and Electro‑Galvanized Steel Pipe support customized production of fixed‑length dimension and zinc‑coating index according to project drawing requirements.
6. Main Applications
Galvanized Steel Pipe is widely‑adopted anti‑corrosion metal pipe for fluid‑transmission and steel‑structure sectors, extensively used for fire‑fighting water‑supply‑drainage pipe network, municipal low‑pressure water supply, agricultural greenhouses, building scaffolding, guardrail fences, equipment supports and mechanical‑electrical pipelines.Hot‑Dip Galvanized Steel Pipe is mainly applied for fire‑protection engineering, municipal water supply, buried pipelines and outdoor steel structures with durable anti‑corrosion performance, being the most‑consumed Galvanized Steel Pipe for infrastructure projects. Electro‑Galvanized Steel Pipe is mostly used for indoor guardrails, equipment supports and decorative components with good performance under dry indoor conditions. Enterprises for fire‑protection installation, municipal mechanical‑electrical and steel‑structure engineering can select products accurately according to service environment, conveyed medium and pressure‑bearing grade. Relying on complete sizes, full certificates and stable mass supply of Galvanized Steel Pipe, construction quality of pipeline and steel‑structure projects can be ensured and later‑stage maintenance cost reduced.
7. Packing, MOQ & Lead Time
- Packing: Galvanized Steel Pipe bundled piece by piece, pipe ends fitted with plastic caps, marked with grade & specification info, zinc‑coating well‑protected for long‑distance sea and land transportation;
- MOQ: 5 tons minimum order quantity, mixed ordering of Hot‑Dip Galvanized Steel Pipe and Electro‑Galvanized Steel Pipe supported, small sample orders and large‑scale engineering bulk procurement acceptable;
- Lead Time: 7‑12 days for regular in‑stock specifications; 15‑25 days for customized special wall‑thickness, special zinc‑coating and deep‑processing orders. Full‑set material & hydrostatic‑test certificates are supplied together with goods, supporting third‑party inspection and applicable to FOB, CIF, DAP and other foreign‑trade terms.
8. Product Advantages
Galvanized Steel Pipe realizes steel anti‑corrosion via galvanizing treatment, greatly delaying rusting compared with black steel pipe and extending overall pipe‑service‑life;
2. Hot‑Dip Galvanized Steel Pipe owns firmly‑bonded zinc coating, resistant to buried‑ground and humid outdoor environment, with good threading, grooving and welding performance, fitting mainstream infrastructure scenarios such as fire‑fighting and water‑supply;
3. Electro‑Galvanized Steel Pipe features bright smooth appearance and economic cost, meeting component‑fabrication requirements under indoor low‑corrosion working‑conditions;
4. Full‑series Galvanized Steel Pipe passes piece‑by‑piece hydrostatic‑pressure and visual inspection with traceable materials, delivering stable large‑volume supply capacity for domestic and overseas pipeline & steel‑structure projects.
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