Hot-rolled square tube welding steel used in construction is a major in the domestic steel market in both occupy an important ratio.

In the welding deformation theory, we can know that the large size of the weld will led to the greater deformation, welding the same size, the welding heat input on large, can lead to large deformation, the long seam welding, welding deformation will be small, asymmetrical seam or asymmetrical arrangement of the welding seam deviation will cause more serious to severe deformation.

Steel pipe surface treatment is a key factors to determine pipeline life, it is the ability to securely and steel pipe coating combined premise verified by research institutions, in addition to the life of the coating depends on the type of coating, coating quality and construction environment and other factors, steel pipe coating surface treatment on the life of about 50%, therefore, it should be strictly in accordance with the specification for the steel surface coating requirements, and continuously explore and summarize the continuous improvement of steel surface treatment method.

General Pipe: Average welded steel pipe used to transport low pressure fluid. With Q195A, Q215A, Q235A steel. Easy welding may also be used in other soft steel. Pipe to carry water pressure, bending, flattening and other experiments, there are certain requirements for surface quality, delivery is usually a length of 4-10m, often required length (or double length) delivery.

Method of checking can wipe with soapy water in the annealing furnace gap at each joint to see if run gas; places where gas is most likely to run into the annealing furnace tube and the tube place where seals are particularly vulnerable to wear and tear this place, always check often change.

In the steel manufacturing process, like a important uses for steel products, such as oil well pipes, boiler tubes, etc., are needed most hardened in order to obtain the desired mechanical properties. Cooling as a key link hardened steel heat treated for production efficiency, product quality and economic efficiency ultimately have a significant impact.

In building water distribution system, galvanized steel pipe has been over a hundred years glorious history and a variety of new plastic pipes and composite pipes have developed rapidly, but there are some deficiencies due to varying degrees, far from being able to fully meet the water supply pipe needs of the department and the state of drinking water and water quality requirements.

Steel tube wall thickness is not same, may on the cross section and longitudinal tube body wall thickness range phenomenon exists objectively, which is called the uneven wall thickness. To control this heterogeneity, in some steel standard provides a uniform wall thickness to allow indicators, the general requirement does not exceed 80% of the wall thickness tolerances.

The stability of spiral welded pipe thermal fatigue generally refers to the work in the cold, heat alternating the role of the ability to resist cracks, which is called thermal fatigue crack due to cold, heat alternating crack said. Limit of weld conditions.

There are different types of stainless steels: when nickel is added, for instance, the austenite structure of iron is stabilized. This crystal structure makes such steels virtually non-magnetic and less brittle at low temperatures. For greater hardness and strength, more carbon is added. With proper heat treatment, these steels are used for such products as razor blades, cutlery, and tools.

Consumption, high efficiency, welded structural steel pipe consumption process is simple. Types of specifications, equipment investment, but the average strength of less than seamless.

The material with which a pipe is manufactured is often the basis for choosing a pipe. Materials used for manufacturing pipes include: