Seamless steel pipes are mainly used in oil pipeline and gas pipeline, but seldom used in oil pipelines with long-distance. Most long distance pipeline applied ERW pipes, SSAW pipes and LSAW pipes. Here are comparisons of technological features and performance of these pipes.    1. Electric Resistance Welding...

Generally, in terms of the surface treatment for stainless steel pipes, manufacturers have three methods, blenching treatment, polishing treatment and coloring treatment. However, it’s unavoidable to have some problems during the surface treatment, mainly are the following problems.   1. Defects of welding crevice....

Currently, the worldwide manufactures are attach great importance to study and research of anti-corrosion to pipes, and many new materials and technologies are emerging. 1. Double epoxy (double FBE). This material was invented by an American company named OBRIEN. The material combined the corrosion resistance and mechanical...

There are several methods of quenching the OCTG pipes, dipping, axial injection, laminar jet and laminar jet combined with axial injection. It will form the centrifugal force when quenching OCTG pipes and the centrifugal force will cause the deformation on pipes, which has serious influence on the quality and application...

There are some features about sulfate electro galvanizing technology.   1. Optimization of sulfate galvanizing The most important advantage of sulfate galvanizing is that the current efficiency can up to 100%, and has a fast deposition rate which is incomparable to other galvanizing technique. Since the crystalline...

With the constant development of industrial technology, the industrial equipment also has been developed rapidly. As a newly developed heat exchange tube with high efficiency, the nodes heat exchange tube has replaced the traditional ones. This new heat exchange tube has some unique advantages.   1. High coefficient...

According to the applications, seamless steel pipe can be classified into several major types.   1. GB/T8162-1999: structure seamless steel pipes. This type of pipe mainly used in general structure and mechanical structure. The representative materials are: carbon steel, steel of NO.20 and 45, alloy steel of Q345,...

This article introduces the extensive applications of ductile iron pipes in detail.    1. Fire protection Ductile iron pipes have three times of safety factor in design, not only can protect the whole fire protection system, the fire valves and fire hydrants are also completely made of ductile iron pipes which...

This article introduces several major types of welded pipes, including their applications and standards in detail.   1.Welded pipe for delivering low-voltage fluid (GB/T3092-1993). This kind of pipe also known as general welded pipe, or black pipe, which is mainly used for delivering low-voltage fluid, including water,...

Chemical cleaning: chemical cleaning of pipe refers to temporarily transformation of the pipeline using chemical agents, adopt chemical cyclic cleaning using temporary pipeline and circulating pump station from both ends of the pipeline. The technology has features such as strong flexibility, high speed, thorough cleaning...

Stainless steel pipe and other products will undergo forming, welding and heat treatment in the manufacturing process, which makes the surface contaminated. Therefore, the passivation treatment is an important and indispensable process. Basically there are following common methods in actual application. Oxide skin removing...

In general, hardness indicators of Brinell, Rockwell and Vickers hardness index are adopted to measure the hardness of steel. 1. Brinell Hardness In stainless steel tube standard, Brinell Hardness is the most commonly used, often impress diameter is applied to express the hardness of the material, which is intuitive and...