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Help CenterSteel Pipe & Tube & Hot-dip Galvanized Steel Pipe，Q235B、Q345B、S275J0、A36、20#、45#
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1. Product Overview
Hot-dip Galvanized Steel Pipe, Anti-corrosion Steel Pipe and Fire-fighting Galvanized Steel Pipe are mainstream engineering pipe products on the market. Galvanized steel pipes are mainly divided into hot-dip galvanized steel pipes and electro-galvanized (cold-galvanized) steel pipes. Among them, Hot-dip Galvanized Steel Pipe and Anti-corrosion Steel Pipe are the first choices for engineering projects due to their excellent performance. Manufactured based on black steel pipes (welded / seamless steel pipes), the products form a zinc protective layer on the steel pipe surface through galvanizing technology, featuring outstanding rust and corrosion resistance. They are widely applied in water supply and drainage, fire protection, gas transportation, steel structure supports, greenhouse construction, municipal engineering and other fields, covering almost all fluid transportation and steel structure building scenarios. Hot-dip Galvanized Steel Pipe boasts a far longer anti-corrosion service life than cold-galvanized steel pipes, with a service life of up to several decades, making it a dominant choice for engineering projects. Cold-galvanized steel pipes have thin and weakly adhesive zinc layers with poor corrosion resistance, so they are rarely used in pressure fluid transportation projects at present.
2. Production Technology
1. Hot-dip Galvanizing Process: Finished Hot-dip Galvanized Steel Pipe, Anti-corrosion Steel Pipe and Fire-fighting Galvanized Steel Pipe undergo multiple pre-treatment procedures including degreasing, acid pickling, water washing and fluxing, then are immersed in high-temperature molten zinc liquid to form a dense and uniform zinc layer on both internal and external pipe walls. After cooling, passivation, trimming and precise inspection, the finished products are delivered. Pipes produced by this process have extremely strong zinc layer adhesion and all-round internal and external galvanized protection, fundamentally improving the rust and corrosion resistance of the pipes.
2. Electro-galvanizing Process: Adopting electrolytic electroplating technology, the zinc layer is mainly attached to the outer pipe wall with an extremely thin inner coating that is easy to peel off. With weak corrosion resistance, electro-galvanized steel pipes are only used for simple decoration and non-pressure-bearing supports.
Most pipes used in current municipal construction, fire protection projects and engineering procurement are high-quality Hot-dip Galvanized Steel Pipe. Engineering projects give priority to Hot-dip Galvanized Steel Pipe, Anti-corrosion Steel Pipe and Fire-fighting Galvanized Steel Pipe, eliminating low-performance cold-galvanized steel pipes to ensure project quality and long-term operational stability.
3. Material Grade
Common base materials for Hot-dip Galvanized Steel Pipe, Anti-corrosion Steel Pipe and Fire-fighting Galvanized Steel Pipe are Q235B and Q355B. Seamless pipes for high-pressure working conditions adopt high-quality steel grades such as 20# and 45#, ensuring structural strength and operational stability of the pipes from the base material level.
Executive Standards:
- GB/T 3091‑2015: Welded Steel Pipes for Low-pressure Fluid Service, applicable to conventional pipes for water supply, drainage, gas and fire protection engineering
- GB/T 8163: Seamless Steel Pipes for Fluid Service, applicable to hot-dip galvanized seamless pipes, anti-corrosion seamless pipes and fire-fighting galvanized seamless pipes for high-pressure working conditions
- Zinc Coating Standard: GB/T 13912 Metallic Coatings, which strictly regulates the zinc layer thickness and protective performance of pipes, ensuring that every Hot-dip Galvanized Steel Pipe, Anti-corrosion Steel Pipe and Fire-fighting Galvanized Steel Pipe meets anti-corrosion quality standards.
4. Specification Parameters
4.1 Nominal Diameter (DN) and Outer Diameter
DN15 (4 points): 21.3mm; DN20 (6 points): 26.9mm; DN25 (1 inch): 33.7mm; DN32 (1.2 inches): 42.4mm; DN40 (1.5 inches): 48.3mm; DN50 (2 inches): 60.3mm; DN65 (2.5 inches): 76.1mm; DN80 (3 inches): 88.9mm; DN100 (4 inches): 114.3mm; DN125 (5 inches): 139.7mm; DN150 (6 inches): 168.3mm; DN200 (8 inches): 219.1mm.
4.2 Wall Thickness
Pipes are available in standard and thickened wall thicknesses. Non-standard wall thicknesses can be customized according to engineering requirements, with a wall thickness range of 2.0‑8.0mm, fully adapting to procurement scenarios with different pressure-bearing and anti-corrosion requirements.
4.3 Standard Length
The standard fixed length of conventional pipes is 6 meters per piece, with customizable lengths ranging from 3 to 12 meters, meeting dimensional requirements of various construction scenarios and adapting to diverse engineering schemes.
4.4 Zinc Coating Weight
Conventional Hot-dip Galvanized Steel Pipe has a standard zinc coating weight of ≥600g/㎡ with an average zinc layer thickness of over 85μm, delivering excellent anti-corrosion performance. Custom high-thickness zinc coatings are available to further enhance the corrosion and weather resistance of pipes for outdoor, humid and highly corrosive working conditions.
4.5 Surface Condition
Finished pipes feature a natural silver-gray galvanized surface with optional passivation anti-oxidation treatment. A small number of uniform zinc tumors and zinc flowers are permissible on the surface, while peeling, uncoated areas and black spots are strictly prohibited to ensure the appearance and quality compliance of every Hot-dip Galvanized Steel Pipe, Anti-corrosion Steel Pipe and Fire-fighting Galvanized Steel Pipe.
5. Product Features
1. Excellent Rust and Corrosion Resistance: Hot-dip Galvanized Steel Pipe and Anti-corrosion Steel Pipe isolate air and moisture through the surface zinc layer. Meanwhile, the zinc layer features sacrificial anode protection, which can continuously protect the steel substrate from rusting even if the pipe surface is slightly scratched, greatly extending the service life in outdoor and humid environments.
2. Superior Mechanical Properties: The pipes fully retain the high strength of the original steel substrate, with excellent compression and impact resistance. They can stably bear pressure for water and gas transportation, serving as the preferred Hot-dip Galvanized Steel Pipe and Anti-corrosion Steel Pipe for pressure-bearing working conditions.
3. Good Machinability: Hot-dip Galvanized Steel Pipe supports secondary processing such as cutting, threading, bending and welding to adapt to various construction processes. Note that welding will damage the surface zinc layer, and anti-corrosion treatment must be supplemented after welding.
4. Convenient Installation: Pipe ends can be customized with threading and grooving processing, enabling rapid connection with matching pipe fittings. The construction process is simple and efficient, greatly shortening the on-site installation period.
5. Application Limitations: Hot-dip Galvanized Steel Pipe and Anti-corrosion Steel Pipe are not suitable for transporting strong acid and alkali media. Long-term high-temperature environments will accelerate zinc layer loss, so pipe selection shall be based on actual working conditions.
6. Main Application Fields
1.Fire Protection Engineering: Fire-fighting Galvanized Steel Pipe is specially used for fire sprinkler and fire hydrant pipe networks, serving as the core material for fire protection pipe systems. All pressure-bearing fire pipe networks adopt qualified products to ensure long-term stable operation of fire protection systems.
2. Water Supply and Drainage System: Food-grade Hot-dip Galvanized Steel Pipe and lined plastic pipes are preferred for tap water transportation. Cold-galvanized steel pipes are forbidden to avoid water pollution and ensure water supply safety.
3. Low-pressure Gas Pipeline: High-quality Hot-dip Galvanized Steel Pipe and Anti-corrosion Steel Pipe are widely used for civil and industrial low-pressure gas and coal gas transportation, preventing gas leakage with high sealing and anti-corrosion performance.
4. Steel Structure Engineering: Hot-dip Galvanized Steel Pipe and Anti-corrosion Steel Pipe are extensively used for greenhouse pipes, guardrails, supports and factory steel structural members, extending the service life of steel structures with outstanding rust resistance and high strength.
5. Municipal and Electromechanical Engineering: Standard Hot-dip Galvanized Steel Pipe and Anti-corrosion Steel Pipe are adopted for municipal road guardrails and electromechanical equipment casing pipes, adapting to complex outdoor environments with weather resistance and low maintenance requirements.
6. Agricultural Facilities: Thin-walledHot-dip Galvanized Steel Pipe is specially used for agricultural and breeding greenhouse frames, featuring high cost performance and excellent rust resistance for outdoor agricultural scenarios.
7. Connection Methods
1. Threaded Connection: The mainstream connection method for small-diameter pipes (DN15‑DN80). Threads are processed on pipe ends for assembly with matching galvanized pipe fittings, featuring convenient installation and good sealing performance for small pipe network construction.
2. Grooved Clamp Connection: A special connection process for medium and large-diameter fire pipe networks (above DN65) and the core connection method for Fire-fighting Galvanized Steel Pipe. Pipes are grooved and assembled with clamp fittings for extremely high construction efficiency.
3. Flange Connection: A special connection method for large-diameter pipes. Flanges are welded on pipe ends and fixed by bolt butt joint, featuring stable connection and strong pressure resistance for large-diameter high-pressure pipe networks.
4. Welded Connection: Applicable to assembly of all types of pipes. Welding will damage the surface zinc layer; after welding, the weld seam must be polished and coated with zinc-rich paint to repair the anti-corrosion layer and restore pipe protection performance.
8. Packaging and Delivery
1. Small-diameter pipes are bundled with steel strips for firm packaging to prevent deformation during transportation; large-diameter pipes are delivered in bulk to reduce transportation costs.
2. All pipe nozzles are equipped with plastic protective caps to block sundries and protect pipe end threads and bevels, ensuring intact product delivery.
3. Factory certificates and quality inspection reports can be provided for Hot-dip Galvanized Steel Pipe, Anti-corrosion Steel Pipe and Fire-fighting Galvanized Steel Pipe. Custom processing services including fixed-length cutting, threading, grooving, chamfering and passivation are available.
9. Delivery Cycle
1. Conventional Stock Orders: In-stock standard-specification Hot-dip Galvanized Steel Pipe, Anti-corrosion Steel Pipe and Fire-fighting Galvanized Steel Pipe with conventional wall thickness and 6m fixed length will be delivered within 3-5 working days after payment confirmation. Sufficient inventory supports large-volume rapid delivery.
2. Simple Processing Orders: Orders requiring threading, grooving, chamfering and simple cutting take 5-7 working days for production and processing, with guaranteed quality for all customized processing services.
3. Non-standard Custom Orders: Custom orders with special wall thicknesses, customized lengths, high zinc coatings, plastic lining and special materials, as well as large-batch orders of Hot-dip Galvanized Steel Pipe, Anti-corrosion Steel Pipe and Fire-fighting Galvanized Steel Pipe take 7-10 working days. The cycle can be adjusted appropriately according to order specifications and process requirements to ensure product quality compliance.
10. Storage and Usage Precautions
1. Pipes shall be stored in dry and ventilated warehouses, avoiding open-air stacking, rain exposure and water accumulation to reduce white rust (zinc oxide spots) and protect pipe appearance and anti-corrosion performance.
2. Slight white rust on pipe surfaces is a normal phenomenon and does not affect service performance. Pipes with severe rusting and uncoated areas are prohibited from being used in pressure pipelines and fire protection engineering.
3. Supplementary anti-corrosion treatment must be carried out in a timely manner after pipe welding to repair damaged zinc layers. Hot-dip Galvanized Steel Pipe and Anti-corrosion Steel Pipe are prohibited from being used for transporting strongly corrosive chemical media.
4. Cold-galvanized steel pipes cannot replace Hot-dip Galvanized Steel Pipe, Anti-corrosion Steel Pipe and Fire-fighting Galvanized Steel Pipe, and are forbidden for core projects such as drinking water transportation and pressure-bearing fire pipe networks to ensure project safety and service life.
11. Optional Derivative Products
- Hot-dip Galvanized Seamless Steel Pipe: High-end pipes dedicated for high-pressure working conditions, suitable for high-pressure fluid transportation engineering
- Plastic-lined Galvanized Steel Pipe: Upgraded lined pipes that prevent zinc ion precipitation, specially used for drinking water transportation engineering
- Greenhouse Galvanized Pipe: Lightweight thin-walled Hot-dip Galvanized Steel Pipe, professionally designed for agricultural and breeding greenhouse frames with high cost performance
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