Galvanised welded steel pipe Definition：
Galvanized Welded Steel Pipe is a kind of steel pipe made by welding process, and its surface is treated with hot dip galvanizing or electro-galvanizing to enhance the corrosion resistance.
Hot-dip galvanized steel pipe has a thicker zinc layer, strong corrosion resistance and long service life; while electro-galvanized steel pipe has a lower cost, but relatively weak corrosion resistance.
Core Advantage：
Strong corrosion resistance: the galvanized layer effectively protects the steel pipe from corrosion and extends its service life.
Long service life: suitable for many environments, reducing maintenance and replacement costs.
Aesthetic appearance: smooth surface, suitable for indoor and outdoor many application scenarios.
Common international standards：
Galvanized welded pipe is usually manufactured in accordance with the following international standards:
ASTM: American Society for Testing and Materials standard, widely used in the North American market.
ISO: International Organization for Standardization standard, applicable to the global market.
EN: European Standard, applicable to the European market.
JIS G3444: Japanese industrial standard, STK400 is the common material, applicable to construction, industry and other fields.
Application Scenario：
Galvanized welded steel pipe is widely used in construction, industry, agriculture and other fields, including:
Building structure, piping system.
Petroleum, chemical and machinery manufacturing.
Agricultural irrigation, greenhouse construction.
Marine engineering, bridge support.
Galvanized Welded Pipe Production Process ：
Raw Material Purchase:
Select the high quality steel that meets the standard, and make sure the chemical composition and mechanical properties of the raw materials meet the production requirements.
Pipe making:
Process the steel into steel pipe through welding process, strictly control the welding quality and dimensional accuracy.
Cutting:
Cut the steel pipe into standard length (e.g. 6m, 12m) or customized length according to customers’ requirements.
Pickling:
Use pickling process to remove oxidized skin and impurities on the surface of steel pipe to ensure the surface is clean and ready for galvanizing.
Galvanizing:
Hot-dip galvanizing: steel pipes are immersed in a molten zinc solution to form a uniform zinc layer, usually ≥70μm in thickness, which is highly corrosion-resistant and suitable for harsh environments.
Electro-galvanizing: the surface of the steel pipe is coated with a zinc layer by an electrolytic process, which is less costly, but the zinc layer is thinner and relatively less corrosion-resistant, suitable for general environments.
Inspection:
The finished steel pipes are fully inspected to ensure that the product quality meets the standard.
Galvanizing Process Differences:
Hot-dip galvanizing (dip galvanizing process):
Process characteristics: steel pipe immersed in molten zinc solution, uniform thickness of zinc layer, strong adhesion, excellent corrosion resistance.
Applicable scenarios: suitable for outdoor, humid environment or scenarios with high requirements for corrosion resistance.
Electro-galvanizing (electrolytic process):
Process characteristics: zinc coating by electrolysis, thin zinc layer, lower cost, bright appearance.
Application Scenario: Suitable for indoor or general environment, cost-sensitive application scenario.
Quality Inspection Points for Galvanized Welded Steel Pipe :
Appearance Inspection:
Check the uniformity of the galvanized layer to ensure that the surface is free from defects such as leakage of plating, peeling, scratches, etc.
Check whether the surface of steel pipe is smooth, free of cracks, scars, etc.
Chemical composition analysis:
Detect the chemical composition of raw materials to ensure compliance with standard requirements (e.g. Q235, Q345, etc.).
Testing the composition of galvanized layer to ensure the quality of zinc layer.
Mechanical Performance Test:
Pressure Resistance Test: To detect the pressure-bearing capacity of the steel pipe to ensure that it meets the design requirements.
Bending test: detect the flexibility of steel pipe to ensure that it is not easy to break during processing and installation.
Dimension test:
Detect the outer diameter, wall thickness, length and other dimensional parameters of the steel pipe to ensure compliance with standards and customer requirements.
Anti-corrosion performance test:
Detect the thickness and adhesion of the galvanized layer to ensure corrosion resistance.
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