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ASTM A333 GR.3 Low Temperature Carbon Steel SMLS Pipe, SCH 40, 12 meters, Black Coating, Beveled Ends.
Carbon steel seamless steel pipe is a kind of long strip steel. The steel pipe has a hollow section and is widely used as a pipeline for conveying fluid, such as oil, natural gas, gas, water and some solid materials. Compared with solid steel such as round steel, steel pipe has the same flexural and torsional strength and light weight. It is an economic section steel, which is widely used in the manufacture of structural parts and mechanical parts, such as petroleum drill pipe, automobile drive shaft, bicycle frame and steel scaffolding used in construction.
Introduction
The fuel is hydrogen or acetylene. Furnace temperature control is a
key problem. After the round tube billet is out of the oven, it
must pass through the pressure perforation machine to carry on the
empty. The common perforator is conical roller perforator, which
has high production efficiency, good product quality, large
perforation diameter expansion and can wear many kinds of steel.
After perforation, the round tube billet has been three-roll
oblique rolling, continuous rolling or extrusion.
Steel pipe or all kinds of conventional weapons indispensable
materials, barrel, barrel and so on are made of steel pipe. The
steel pipe can be divided into round pipe and special-shaped pipe
according to the shape of cross-sectional area. Because the
circular area is the largest under the condition of equal
circumference, more fluid can be transported by circular pipe. In
addition, the ring section under internal or external radial
pressure, the force is more uniform, therefore, most of the steel
pipe is a circular pipe.
Making ring parts with steel pipe can improve the utilization ratio
of materials, simplify the manufacturing process, save materials
and processing hours, such as rolling bearing ring, Jack sleeve,
etc. At present, steel pipe has been widely used to manufacture.
It is divided into 10# seamless steel pipe ,20# seamless steel pipe
,4# seamless steel pipe and so on.Material factors
(1) The importance of structure The importance of heavy-duty
industrial building structures, long-span structures, high-rise or
super-high-rise civil building structures or structures, etc.,
should consider the selection of seamless steel pipes of good
quality, and for general industrial and civil building structures,
the selection of seamless steel pipes of ordinary quality can be
made according to the nature of work.
(2) Seamless steel pipes with good comprehensive performance should
be used for structures directly bearing dynamic loads and those in
strong seismic zones under load conditions, while seamless steel
pipes with lower prices can be used for structures generally
bearing static loads.
(3) The welding process of the connection method results in welding
deformation, welding stress and other welding defects, and there is
a risk of cracks or brittle fracture of the structure. Therefore,
the welding structure should be strict with the material
requirements.
(4) In the temperature and environment of the structure, seamless
steel pipe is easy to be cold and brittle at low temperature, so
the structure working at low temperature, especially the welding
structure, should choose the sedative steel with good resistance to
low temperature brittle fracture. In addition, Taiyuan seamless
steel pipe with open-air structure is easy to produce aging, and
seamless steel pipe with harmful medium is easy to corrode, fatigue
and fracture, so different materials should be selected
differently.
(5) Too seamless steel pipe thickness, thin seamless steel pipe
roll rolling times, rolling compression ratio is large, the
thickness of seamless steel pipe compression ratio is small, so the
thickness of precision steel pipe not only less strength, but also
poor plasticity, impact toughness and welding performance.
Therefore, the welding structure with large thickness should adopt
seamless steel pipe with good material.
Carbon steel seamless steel pipe has the following standards:
GB8163 | Seamless steel pipe for fluid transportation: |
GB6479 | High pressure seamless steel pipe for chemical fertilizer equipment |
GB9948 | Seamless steel pipe for petroleum cracking |
GB3087 | Seamless Steel Pipe for Low Medium Pressure Boiler |
GB5310 | Seamless Steel Pipe for High Pressure Boiler |