Hot Rolled Welded SS Steel Pipes 347 316Ti 904L ASTM A269 A312
According to different production methods, it can be divided into
hot rolled tube, cold rolled tube, cold drawn tube, extrusion tube
and so on.
1.1. Hot rolled stainless steel seamless tubes are generally
produced on automatic tube rolling sets. The solid tube blank is
checked and cleared of surface defects, cut into the required
length, centering on the perforated end face of the tube blank, and
then sent to the heating furnace for heating, and perforated on the
punch machine. In the perforation at the same time continuous
rotation and forward, under the action of the roll and the top, the
tube blank gradually formed a cavity, called the wool tube. Then it
is sent to the automatic pipe mill to continue rolling. Finally,
the wall thickness of the whole machine is adjusted, and the sizing
machine is adjusted to meet the specification requirements. It is
an advanced method to produce hot rolled seamless steel tube with
continuous rolling tube set.
1.2 If you want to obtain seamless tubes with smaller size and
better quality, you must use cold rolling, cold drawing or a
combination of both methods. Cold rolling is usually carried out on
a two-high mill. The steel pipe is rolled in an annular pass
consisting of a circular groove with a variable section and a
stationary conical top. Cold drawing is usually carried out in 0.5
~ 100T single chain or double chain cold drawing machine.
1.3. Extrusion method: The heated tube blank is placed in a closed
extrusion cylinder, and the perforated rod moves together with the
extrusion rod to extrude the extruded parts from the smaller die
hole. This method can produce smaller diameter steel pipe.
This kind of steel pipe can be divided into stainless steel
seamless steel pipe and stainless steel welded steel pipe (seam
pipe) two categories, according to the different manufacturing
process can be
For: hot rolling, extrusion, cold drawing and cold rolling these
basic types, according to the shape of the section and can be
divided into round pipe and special-shaped pipe, widely used is
round steel pipe, but there are some square, rectangular,
semicircular, hexagonal, equilateral triangle, octagonal
special-shaped stainless steel pipe.
For the steel pipe under fluid pressure to carry out hydraulic test
to test its pressure capacity and quality, under the specified
pressure does not leak, wet or expansion for qualified, some steel
pipe according to the standard or the requirements of the side
test, flaring test, flattening test.
Seamless stainless steel tube, also known as seamless stainless
steel tube, is made of steel ingot or solid tube blank by
perforation of wool tube, and then made by hot rolling, cold
rolling or cold dialing. The specifications of seamless steel pipe
are expressed by the number of millimeters of outer diameter * wall
|Commodity Name||Stainless steel pipe|
|Standard||ASTM A269 A312|
|Material||347 316Ti 904L|
|Length||8-10m or customize|
|Tolerance||OD±1% WT±5% or as per customers' request|
400G,500G,600G or 800G Mirror finish
|Test||Squash test, extended test, water pressure test, crystal rot test,
heat treatment, NDT|
|Application||Construction, Industry, Petroleum, Chemical, Boiler and Exchanger|
Beveled end or pained
Marking as customers' request
Plastic caps at ends
Wooden box packing
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