What is a galvanized steel pipe?
As we can see galvanized steel pipe means the pipe with zinc coaing.
All the galvanized steel pipe surface is the same?
Usually there are two kinds main galvanized surface.
Pre galvanized steel pipe and hot dipped galvanized steel pipe.
Pre galvanized steeel pipe means we welded the galvanized steel pipe with a galvanized steel strip. While the hot dipped galvanized steel pipe is made from black steel pipe by hot dipped galvanizing.
Pre galvanized steel pipe zinc coating is: 40-60gram per square meter.
The hot dipped galvanized steel pipe zinc coating is normally more than 220gram per square meter.
So usually the hot dipped galvanized steel pipe can be used for much longer.
And hot distinguish the hot dipped galvanized pipe and pre galvanized steel pipe?
As i said the pre galvanized steel pipe is made from welding the galvanized strip. So inside surface of the pipe with a black welding seam.
But hot dipped galvanized steel pipe is made from galvanizing the black steel pipe. So the inside surface of the hdg pipe with a white welding seam.
Before you buy any galvanized steel pipe, pay more attention to this point incase that you are deceived.
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