China Gi Pipe Supplier with ISO Certification for Highway Signage Supports

Product Description

Product Description

Galvanized Pipe / Seamless & Welded Galvanized Pipe
 

Material:
Carbon Steel:Q195,Q215,Q235,SPHC,SPHD,SPHE etc..

Selection Recommendations:
Corrosion resistance requirements: zinc-aluminum alloy plating (e.g. Galfan) is recommended for coastal areas.

Welding Requirements: Mild steel (Q195-Q235) is easier to weld and requires pre-treatment of zinc coating.

Cost control: Ordinary carbon steel + hot-dip galvanizing is the most cost-effective, suitable for bulk purchase.

First, the process of galvanized pipe
The production of galvanized pipe mainly consists of base pipe manufacturing (welded/seamless) → galvanized treatment of two major stages, the specific process is as follows:
1. Base pipe manufacturing (pipe molding)
(1) welded steel pipe (Welded Pipe)
Raw materials: hot-rolled or cold-rolled steel coils (SPHC, Q195-Q235, etc.).
Process flow:Steel strip uncoiling → leveling → high-frequency welding (HFW) / submerged arc welding (SAW) → removal of internal and external welding scars → sizing → cutting → inspection  
Common types: straight seam welded pipe (ERW), spiral welded pipe (SSAW).
(2) Seamless Pipe
Raw material: round billet (carbon steel, alloy steel).
Process flow:Billet heating → punching → hot rolling/cold drawing → straightening → cutting → pickling → inspection  
2. Galvanizing
The main types of galvanizing are hot dip galvanizing (HDG) and electro galvanizing (EG), of which hot dip galvanizing is more common:
(1) Hot-Dip Galvanizing (HDG)
Process:Degreasing by alkali washing → washing → descaling by acid washing → washing → auxiliary plating agent → drying → zinc dipping (molten zinc at 450°C) → cooling → passivation (optional) → inspection  
Plating characteristics: thick zinc layer (50-200μm), strong corrosion resistance, suitable for outdoor use.
(2) Electro-Galvanizing (EG)
Process flow:
Electrolytic degreasing → acid washing → zinc plating (zinc salt solution electrified) → passivation → drying  
Plating characteristics: thin zinc layer (5-30μm), smooth surface, suitable for precision parts or subsequent coating.

Specification range

Typical Application Areas

Construction & Building
Fencing & Guardrails
Water & Gas Pipelines
Automotive & Electrical Appliances
Agriculture & Greenhouse
HVAC & Ductwork

 

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Main Products

Company Profile

Emerging in the 1980s,Lecong Steel World draws on over forty years o successful steel trading experience and officially established in 2009.Over the past decade,we are committed to develop a comprehensive supply chain system encompassing 'metal trading-warehousing-logistics-processing and distribution,'offering one-stop solutions for global manufacturing,infrastructure,machinery,construction,fire engineering,municipal projects,steel structure initiatives,and more than 20 steel-using industries.As of today,the park has evolved into the largest wholesale market for metal materials worldwide.Our Global is to empower our clients to gain competitive advantages through cost reduction and improved efficiency,thereby establishing our premium brand image in the global metal industry.

Workshop & Equipment

Exhibitions & Our Customers

Certifications

Packaging & Shipping

FAQ

1. How long has your company been established? Do you have import and export rights?

           We Steel World established in 2009,and owns the rights to export.

1. Is there a factory or production line? Can you provide photos/videos of the factory? Is it possible to visit the factory?

           We have our own machining centre and large diameter pipe factory, we can provide you with the factory photos and production line videos you want, and                you are always welcome to visit our factory.

1. Availability of international product certification and industry certification (e.g. ISO, CE, RoHS, etc.)

           We can meet customers' international product certification, such as: GB, EN, JIS, Australian Standard and so on.
            The factories under our company have met the ISO certification, ROHS and other certifications.

        4. What is the minimum order quantity (MOQ)? Is it in stock? How long is the lead time?
            MOQ and lead time will depend on specific products. We mainly deal in stock and can deliver in 2-3 days. However, for special requirements, customisation               is required and lead time is needed.
      5.What payment methods are accepted?
          We can accept TT, LC, PayPal,West Union and other payment methods.