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(1) Hot-dip galvanized sheet is contacted or stored together with other corrosive media such as acid and alkali.
(2) The surface is not covered with oil or residual water on the strip surface.
(3) The strip surface contains moisture during coiling.
(4) Passivation is not completely dry.
(5) Bad passivation, insufficient passivation film thickness or unevenness.
(6) Wet or rainy water during transportation or storage.
(7) The product is stored for too long.
Note: Dark spots are formed by the further oxidation of white rust.
Steel Structures can be used in many industries such as foundation reinforce, electric power transmission structures and tubular scaffolding, etc.
A flange can also be a plate or ring to form a rim at the end of a pipe when fastened to the pipe. A blind flange is a plate for covering or closing the end of a pipe. A flange joint is a connection of pipes, where the connecting pieces have flanges by which the parts are bolted together.
Although the word flange generally refers to the actual raised rim or lip of a fitting, many flanged plumbing fittings are themselves known as 'flanges':
There are many different flange standards to be found worldwide. To allow easy functionality and interchangeability, these are designed to have standardised dimensions. Common world standards include ASA/ASME (USA), PN/DIN (European), BS10 (British/Australian), and JIS/KS (Japanese/Korean). In the USA, ANSI stopped publishing B16.5 in 1996, and the standard is ASME B16.5
Steel Structures Carport,Substation Steel Structure Fabrication,Peb Steel Structure,Light Steel Structure
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