The first mode of production: the tube (plate, belt) molded directly welded into the pipe, the main steps of the strip forming, welding, sizing. Features: less production processes, engineering process is simple, short production cycle, product accuracy is slightly lower.

Large diameter LSAW steel pipe suit for conveying sea and land oil and gas, oil and natural gas, coal and ore oar medium pipeline , particularly appropriate Currently being built in our country "west to east gas pipeline project", can also be used for exports and replace imported.

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

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

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.

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 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.

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.

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

Double submerged arc welded straight seam steel pipe is a new welding method invented in 1940, it is the same place and the front of the manual welding it or slag protection, but this residue is not the electrode coating, but melting out welding flux. Flux system consists of a funnel filled with flux transported through a pipeline to the front to be welded.

Thick-walled welded steel pipe, its main production principle is: large diameter thick-walled welded pipe is above the recrystallization temperature rolling, cold rolling is the recrystallization temperature at rolling.

Most steel is processed by press working of steel, a steel to be processed (billet, ingot, etc.) is plastically deformed. According to the steel with steel processing temperature is not cold and hot working with two kinds of points.