ERW pipe is separated into many different
types. Following is their difference and various usage.
Welded metal pipe: also known as pipe, it
is made by flexing metal sheet or strip, and then welded. According to the weld
type it is separated into Longitudinal and spiral pipe.
By end-use it is separated into common
pipe, galvanized pipe, oxygen lance pipe, wire casing, metric pipe, roller
pipe, deep well pump tubes, automobile tubes, transformers pipes, welding
thin-walled tube, welding shape tube and spiral welded pipe.
General pipe: General pipe are used to transport low stress liquid, we
also call it black pipe. Content is almost of Q195A, Q215A, Q235A. Or some
other easily welded mild metal. Pipes must be performed the research of the
stress, flexing, trimming and surface quality. Usually the submission duration
is 4-10m, and often be needed to deliver special duration (or dual length).
Specifications of welded pipe with affordable size (millimeters or inches) are
different with the actual. As to the walls width of pipe, there are common
metal pipe and thicker steel pipe. By the way of pipe end, there are
sub-threaded and threaded. With the technology of welded metal pipe to enhance
and handling be more simply, some welded pipe can replace part of the seamless
pipe. And we can generate pipe of outer size up to 219mm (8 inch) right now.
Galvanized steel pipe: in order to enhance the deterioration level of
resistance of steel pipe, we always coat some zinc oxide on the outer area of
common steel pipe, that is galvanized pipe.
There are two division of galvanized pipes: hot-dipped and
electro-galvanized. The zinc oxide covering of hot-dipped galvanized is thicker
than electrical. But the latter is less cost.
Oxygen: The pipe is used for blowing Oxygen in steelmaking. generally are small
size pipe. And sizes are almost eight types from 3/8 inches to 2 inches.
Content are almost 08,10,15,20 or Q195 AT-of Q235. For deterioration level of
resistance, some pipe are aluminized.
conduit: Usually it is common welded as well as carbon steel pipe and used in
tangible and a variety of structure and submission projects. The affordable
size are from 13mm to 76mm. The walls width is slim and mostly coated or
galvanized. And cold bending test has been requested.
Roller tube: The
roller pipe is used for buckle machine, usually the material are Q215, Q235A,
B-grade metal and 20# metal. Diameter are from 63.5mm to 219.0mm. It has
certain requirements curvature, end perpendicular to the centerline and
ellipticity. Always it should be conducted the general pressure and flattening