Steel pipe application in structure engineering

With the expansion of production scale and continuous progress of human civilization, many large spaces and large-span buildings such as stadiums, exhibition halls, airport terminals, subway stations, and other large industrial plants continue to emerge, apparently reinforced concrete structure, wood structure, masonry structure is difficult to achieve this in the form of large-span spatial structures.

Steel pipes applications

Due to the rapid growth of steel production, national policy guidance and steel design, research, construction teams increasingly powerful, and many other favorable factors, the steel structure with its own superior performance, its application has been rapid development in recent years, almost all range of applications domain structure, including housing construction, bridges, dams, offshore platforms and the tower mast structure.

Steel structure engineering technology main uses to steel production, steel beams, steel columns, steel trusses and other components made of steel and steel plate composition; using welds, bolts or rivets connections between each component or components structure, is one of the main building structure type. Mainly in the production of steel structures, is one of the main building structure type. Steel is characterized by high strength, light weight, good rigidity, strong deformation capacity, so for the construction of large-span and super, super-heavy buildings particularly suitable; homogeneous and isotropic material is good, is ideal elastomer best serves the general engineering mechanics basic assumptions; material ductility, toughness, and can have large deformation, can well withstand dynamic loads; construction period is short; their high degree of industrialization, mechanization can be a high degree of specialization. Steel should study high-strength steels, greatly improving its yield point strength; addition to new varieties rolled steel, such as H-beam (also known as wide-flange beam) and a T-shaped steel and steel sheeting, etc. to accommodate large-span structures and high-rise building needs. There is also no thermal bridge of light steel structure, the building itself is not energy efficient, the technology of special connection with ingenious solution to the problem of hot and cold bridge construction; small truss structure of the cable from the wall and down the water pipes crossing, construction decoration are convenient.

Currently steel structure engineering can be used cross-sectional shape, structure and production methods for classification. Sectional shape by the steel pipe member may be divided into three structural classes: the structure pipe, square (rectangular) tube structure, and other shapes. Because of the superiority of the appearance and performance of the force on the tube structure and square tube structure is most common.

Form of the structure can be divided into grid tube structure (network shell), trusses, steel frame and concrete structure H species. And the usual sense, tube structure refers to the use for structural tube and square tube between the components, pipes and tubes connected by intersecting welds. By production methods to points, can be divided into hot-rolled steel pipe structure structure structure of cold-rolled steel and welded steel structures. Hot-rolled steel pipe wall thickness can be larger, high production costs, cold-rolled steel pipe wall thickness is relatively thin.



Tech & Service of Seamless pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
How to calculate a steel pipe and tube theoretic weight
Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.
Condition on delivery:

It refers to the state of final plastic deformation or final heat treatment of the delivered product. The hot-rolled or cold drawn (rolled) state or manufacturing state generally delivered without heat treatment; the heat-treated state after heat treatment delivery, or the normalizing, tempering, solid solution, annealing according to the type of heat treatment status.

Delivery status Abbreviation Description

Cold-finished/hard
(cold-finished as-drawn)

BK No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft
(lightly cold-worked)
BKW After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed GBK After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized NBK The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.

Delivery according to actual weight or delivery according to theoretical weight

 


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