Thick wall 446 1.4418 stainless steel tube pipe cold rolled hot
extrusion
Description:
ASTM A312 EN10216 stainless steel tube pipe.
Stainless steel seamless tube pipe manufacturing process
1. Hot rolling (extrusion seamless steel pipe): round billet →
heating → perforation → three-roll cross-rolling, continuous
rolling or extrusion → pipe removal → sizing (or reducing diameter)
→ cooling → straightening → hydraulic test (or flaw detection) →
mark → warehousing
Details:
The raw material for rolling the seamless pipe is a round tube
blank, and the round tube blank is cut into a blank having a length
of about 1 m by a cutting machine, and sent to a furnace for
heating via a conveyor belt. The billet is fed into a furnace and
heated to a temperature of approximately 1200 degrees Celsius. The
fuel is hydrogen or acetylene. Furnace temperature control is a key
issue. After the round billet is released, it is subjected to a
through-hole punching machine. The more common perforating machine
is a conical roller punching machine. This perforating machine has
high production efficiency, good product quality, large diameter of
perforation and can wear a variety of steel types. After
perforation, the round billet is successively rolled, rolled or
extruded by three rolls. After extrusion, the tube should be
sizing. The sizing machine is rotated at a high speed by a conical
drill bit into a steel core to form a steel pipe. The inner
diameter of the steel pipe is determined by the outer diameter of
the sizing machine drill bit. After the steel pipe has been sized,
it enters the cooling tower and is cooled by water spray. After the
steel pipe is cooled, it is straightened. After the steel pipe is
straightened, it is sent to a metal flaw detector (or water
pressure test) by a conveyor belt for internal flaw detection. If
there are cracks inside the steel pipe, bubbles and other problems
will be detected. After the quality inspection of the steel pipe,
it must be carefully selected by hand. After the quality inspection
of the steel pipe, the paint is sprayed with the number,
specification, production batch number, etc. It is hoisted into the
warehouse by a crane.
2. Cold drawn (rolled) seamless steel pipe: round tube billet →
heating → perforation → head → annealing → pickling → oiling
(copper plating) → multi-pass cold drawing (cold rolling) → blank
tube → heat treatment → straightening →Hydraulic pressure test
(inspection)→marking→into the warehouse.
The rolling method of cold drawn (rolled) seamless steel pipe is
more complicated than hot rolling (extrusion seamless steel pipe).
The first three steps of their production process are basically the
same. The difference begins with the fourth step. After the round
billet is hollowed out, it is required to start and anneal. After
annealing, it is acid washed with a special acidic liquid. After
pickling, apply oil. This is followed by a multi-pass cold drawing
(cold rolling) of the blank tube, followed by a special heat
treatment. After heat treatment, it is straightened.
