Classification of Seamless Steel Pipe Applications

The time of issue:2014-7-8 8:31:54       Author:

Due to some special stainless steel gradually built smelting refining equipment, such as AOD ( argon- oxygen refining furnace ), VOD ( vacuum oxygen refining furnace ) and has been put into operation , etc., of stainless steel smelting technology to a new level. It only makes a low-carbon, low carbon stainless steel production a breeze, but also improve the quality of the stainless steel inner, lower costs, seamless steel pipe application will become more widespread. Since the Ti-containing 18-8 Cr-Ni austenitic steels several serious disadvantages, the commonly used by many advanced industrial countries in the 1960s were stainless steel of Ti carbon and ultra-low carbon, while China is strong in 1985-1990 before low-carbon, low carbon stainless steel development, production and seamless steel pipe application, made some encouraging progress, such as the end of 1988 of a low-carbon, ultra-low carbon 18-8 stainless steel production in China's stainless steel production accounts for about 10%.

But with the stainless steel production, compared to the application of advanced countries (Eg 18-8 Cr-Ni steels Japan and the United States containing Ti only about 1.5% of the stainless steel production); there is still a big gap. Seamless steel pipe has an important position in China's steel industry. It is said that, the number of seamless pipe production enterprises in China is about 240, and the production of about 250 sets of steel pipe unit can reach an annual capacity of about 450 million tons. From the caliber look, <φ76, accounting for 35%, <φ159-650, accounting for 25%. From the species, general purpose pipe 1.9 million tons, accounting for 54%; seamless steel pipe manufacturing process because of the different, is divided into hot-rolled ( extrusion ) Seamless two seamless and cold drawn ( rolled ). There are two types of cold drawn (rolled) pipe, the circular pipe and shaped pipe.

Usually, cold drawn seamless steel pipe application is mainly for high dimensional precision mechanical structure, Hydraulic equipment and precision seamless tube cold good surface finish pull. Select precision seamless tube manufacturing mechanical and hydraulic structures or equipment can greatly reduce the processing time, and it can improve efficiency and product quality. Cruor get smaller size and better quality seamless must be cold-rolled, cold drawn or both combined. Cold rolled normally on two-roll mill, steel circular hole in the variable cross-section hole tapered slot and does not move head consisting of rolling. Drawing is usually carried out on 0.5 ~ 100T single chain or double chain drawing machine.

Seamless steel tubes with durable and require almost no maintenance surface these two features, encourage people all over the ever more emphasis on seamless steel pipe application. Most construction materials prices are raising rapidly in a certain proportion while the prices of many materials and far exceed the seamless steel pipe materials. For the maintenance and support of internal and external structure of the building is in good condition costs soared more staggering. It is precisely because this material is easy to shape, durable and beautiful, so many architects used seamless steel pipe not only simple it as a protective layer, but rather as an integral part of the overall design. This is why the seamless steel pipe application will be very extensive.

It has a variety of different strength - weight ratio to suit the requirements of all types of building structures. In addition, different levels of surface finish also provide the choice for a variety of different building facilities to meet the actual needs. Seamless steel pipe application in the construction industry will be accepted by more and more people due to the bold ideas architects. API steel pipe is a hollow cross section, no seams around the long bar of steel. The material utilization can be improved by steel hollow sections, which can be used to transport oil, natural gas and so on. In addition, the sections can also simplify the manufacturing process, save material and machining time. And some solid materials, pipes, etc.

Compared to other steel and solid steel bar, API steel pipe in flexural torsional strength, lighter weight, is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive transmission shafts, bicycle frames and construction using steel scaffolding.

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