Focusing on the process of the major industrial countries of the world's welded steel pipe consumption and development , they have experienced a variety of structural adjustment process. When the technology level of welded steel pipe production increase, the cost will decrease, and the industry will develop.

Ultrasonic inspection of seamless pipes principle

Spiral steel pipe weld gap as too large, then reductions constitute vicinity effect, eddy current lack of heat, poor weld crystal indirect co-occurrence of incomplete fusion or cracking; if the gap is too small, the effect is increased near constitute, excessive heat welding to form welding seam burning;

Tubing is important to oil drilling equipment, and its main equipment includes drill, core pipe and casing, drill collars and drilling small diameter steel pipe and so on. Mainly used for oil well drilling and completion during drilling after wall support, in order to ensure the conduct and completion of the drilling process of the wells after the regular oil casing normal operation.

After cold expansion for lsaw steel pipe, steel tube and pipe end diameter will increase by about one percent difference in diameter of the diameter, roundness, and the pipe ends are greatly improved, also have greatly improved the straightness of the steel pipe, steel pipea length of about 0.5% reduction in wall thickness decreases by about 0.8%.

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.