?Hot - dip galvanized pipes: First, the steel pipes are pickled to remove iron oxide, then cleaned with an aqueous solution of ammonium chloride or zinc chloride, and finally sent to a hot - dip galvanizing bath. The steel pipe substrate undergoes physical and chemical reactions with the molten plating solution, forming a zinc - iron alloy layer that integrates with the pure zinc layer and the steel pipe substrate, resulting in strong corrosion resistance.

Technical Requirements

? Grade and chemical composition: It complies with the grades and chemical compositions of the steel for black pipes specified in GB 3092.

? Manufacturing method: The manufacturing method of the black pipes is selected by the manufacturer, and hot - dip galvanizing is used for galvanizing.

? Threads and pipe joints: For galvanized steel pipes delivered with threads, the threads are machined after galvanizing and comply with the provisions of YB 822. Steel pipe joints comply with the provisions of YB 238, and malleable cast iron pipe joints comply with the provisions of YB 230.

? Mechanical properties: The mechanical properties of the steel pipes before galvanizing comply with the provisions of GB 3092.

? Uniformity of the galvanized layer: The steel pipe specimens shall not turn red after being continuously immersed in a copper sulfate solution for 5 times.

Product Specifications

? Youfa galvanized pipes are available in a wide range of specifications, commonly including DN15 - DN200 and many others. For example, for DN15 pipes, the wall thickness options include 1.8mm and 2.0mm, while for DN200 pipes, the wall thickness can be 2.75mm, 5.5mm, etc.

Product Features

? Strong corrosion resistance: The hot - dip galvanizing process endows the steel pipes with a uniform and strongly adhered galvanized layer, which can effectively resist the corrosion of the external environment and extend the service life.

? Good mechanical properties: The mechanical properties of the steel pipes before galvanizing meet relevant standards. They have high strength and toughness and can withstand certain pressure and external forces.

? High dimensional accuracy: The wall thickness and diameter of Youfa galvanized pipes are strictly controlled, meeting the requirements of dimensional accuracy for various engineering projects.

Application Fields

? Construction field: It is used for stair handrails, railings, door and window frames, roof supports, etc. in building structures, and can also be used as water supply and drainage pipes in buildings.

? Municipal engineering: It can be used for road guardrails to protect the safety of pedestrians and vehicles, and also for hydraulic projects such as urban sewage treatment and drainage systems.

? Industrial field: In industries such as electricity, petroleum, and natural gas, it is used as the basic support for equipment. It is also used for conveying pipelines and frame structures in machinery manufacturing.