ASTM A252 Welded Galvanized Steel Pipe

Galvanized Welded Steel Pipe for low pressure fluid transfer

(hot-dip galvanized part)

1. Uniformity of galvanized layer: steel tube sample shall not turn red (copper plating color) after 5 consecutive impregnations in copper sulfate solution.

2, surface quality: the surface of Galvanized Steel Pipe should be complete galvanized layer, there should be no black spots and bubbles on the plating, allowing a small rough surface and local zinc tumor.

3, galvanized layer weight: according to the requirements of the customer, Galvanized Steel pipe can be measured zinc layer weight, its average should not be less than 500g/ square meter, including any sample should not be less than 480g/ square meter.

       Hot dip galvanized Steel Pipe is to make molten metal react with iron substrate to produce alloy layer, so that the substrate and coating are combined. Hot dip galvanizing is to pickle the steel pipe first. In order to remove the iron oxide on the surface of the steel pipe, after pickling, the steel pipe is cleaned by ammonium chloride or zinc chloride aqueous solution or ammonium chloride and zinc chloride mixed aqueous solution tank, and then sent to the hot dip galvanizing tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life. Steel grade: q215a; Q215B; Q235A; Q235B.Test pressure value / MPA: d10.2-168.3mm is 3Mpa; 5 MPa for d177.8-323.9 mm. It is mainly used for conveying gas, heating, domestic water supply and drainage, fire protection, etc

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