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What is the national standard thickness of galvanized steel pipe

Calculation formula of steel pipe weight: [(outer diameter - wall thickness)* wall thickness]*0.02466=kg/ m (weight per meter)

Galvanized steel pipe size specification table description: W=C×[0.02466×(D-S)×S]


W-- Galvanized pipe per meter weight: kg/m


C-- Increased weight coefficient of galvanized pipe over black iron pipe


D-- Outside diameter of black iron pipe


S-- Wall thickness of black iron pipe


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Galvanized steel pipe GB thickness DN15-GB thickness 2.75, DN20-GB thickness 2.75, DN25-GB thickness 3.25, DN32-GB thickness 3.5, DN40-GB thickness 3.5, DN50-GB thickness 3.5, DN65-GB thickness 3.5, DN80-GB thickness 4, Dn100-gb thickness 4, DN125-GB thickness 4.5, DN150-GB thickness 4.5, DN200-GB thickness 6.0.


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Technical requirements for galvanized steel pipe


1. Brand name and chemical composition


The grade and chemical composition of galvanized steel pipe shall conform to the grade and chemical composition of black pipe steel stipulated in GB/T3091.


2. Manufacturing method


The black tube manufacturing method (furnace welding or electric welding) is chosen by the manufacturer. Galvanizing adopts hot dip galvanizing method.


3, thread and pipe joint


(a) Galvanized steel pipe for delivery with thread, the thread shall be turned after galvanized. Threads shall conform to YB 822.


(b) Steel pipe fittings shall conform to YB 238; Malleable cast iron pipe fittings shall conform to YB 230.


4. Mechanical properties The mechanical properties of the steel pipe before galvanized should conform to the provisions of GB 3091.


Galvanized steel pipe Welded steel pipe with hot dip plating or electrogalvanized coating. Galvanized steel pipe can increase the corrosion resistance, prolong the service life. Galvanized pipe has a wide range of uses, in addition to the pipeline pipe for water, gas, oil and other general low pressure fluid, but also used in the petroleum industry, especially the oil well pipe, oil pipeline, chemical coking equipment of the oil heater, condensate cooler, coal distillation and washing oil exchanger with the pipe, and trestle pipe pile, mine tunnel support frame with pipe.


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Zhishang Steel Co., Ltd

ABOUT USOverviewThe company mainly deals in color-coated, galvanized, stainless steel pipes, stainless steel coils, stainless steel plates of various materials; hot-rolled series of rebar, medium and heavy plates, coils, I-beams, angle steels, channel steels, H-beams and other steel products and deep processing Service. (The company’s annual invent···

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