In fact, the corrosion resistance of stainless steel pipe is good because of the formation of a layer of purified film on the surface, in nature, it is in the form of a more stable oxide. But although the stainless steel tube according to the use of different conditions, the degree of oxidation is not the same, but the end are oxidized, this phenomenon is usually called corrosion.

Excessive welding, simply put, is in the welding of stainless steel pipe, welding time is too long, welding heat input is too high or welding too many times, beyond the reasonable range of welding process.

304L stainless steel pipe: chromium (Cr) content is the same about 18% - 20%, nickel (Ni) content of about 8% - 10.5%, but the carbon (C) content is lower, not more than 0.03%. The lower carbon content is an important feature of 304L stainless steel pipe.

304 stainless steel pipe has a long service life, from the use of stainless steel pipe in foreign countries, the service life of 304 stainless steel pipe can be up to 100 years, or 70 years, and the building is almost the same life. Of course, the premise is that the quality of 304 stainless steel pipe can not be too bad. 304 stainless steel pipe advantage is corrosion resistance, if the purchase of stainless steel pipe quality can be, in the use of the process of proper maintenance and cleaning, can effectively extend the service life of 304 stainless steel tube.

Stainless steel 304 steel pipe: high-quality materials and a wide range of applications, from the following four aspects of the detailed description: model specifications, material properties, product advantages and application areas.

Stainless steel 304 steel pipe material Stainless steel 304 steel pipe is a common stainless steel material, mainly composed of chromium and nickel. Among them, the content of chromium is 18% to 20% and the content of nickel is 8% to 10%. The material has good corrosion and oxidation resistance, and is able to keep its properties stable in high temperatures and humid environments.

Cold Rolling - Annealing Cold Rolling: It is the process of pressure and stretching ductility. Smelting can change the chemical composition of steel materials. Cold rolling can not change the chemical composition of steel, the coil will be placed in the cold rolling equipment rolls applying different pressures, the coil will be cold rolled to different thicknesses, and then through the last finishing roll, control coil thickness accuracy, general accuracy within 3 silk.

Spiral steel pipe is a strip steel coil as raw materials, regular temperature extrusion, according to the spiral shape of the bending molding, automatic double-wire double-sided submerged arc welding process for the inner seam and the outer seam welded spiral seam steel pipe. The raw materials are strip coil, welding wire and flux.

Straightening of LSAW steel pipe is an important process in the production of LSAW steel pipe. Especially for the higher quality requirements of API standard oil casing and oil and gas pipes, special pipes for machinery and equipment, these steel pipes not only have strict requirements on steel grade and weld quality, but also have high requirements on the straightness of the steel pipe, because the deviation of the straightness is directly related to the processing of threads and hoops at the pipe ends of the oil casing and transportation pipes, connection, and twisting deformation in the process of pipeline use.

Galvanized square tube processing plating process mainly has pretreatment, plating and post-plating processes, the quality of the plating depends on the material plating process, and the plating process is affected by many factors, summarized in six factors are as follows:

Before the 1990s, most buildings in China used galvanized pipes, and now the kind of iron pipes used for gas and heating are also galvanized pipes. Galvanized steel pipe is divided into cold plated pipe, hot plated pipe, cold galvanized pipe outside the plating is not plated. As a water pipe, after a few years of use, the pipe produces a large amount of rust scale, outflow of yellow water not only contaminated sanitary ware, but also mixed with not smooth wall of bacteria, rust caused by the high content of heavy metals in the water, a serious danger to human health.

Spiral welded steel pipe refers to the steel strip or steel plate bent and deformed into round, square and other shapes and then welded into a steel pipe with seams on the surface. According to the different welding methods can be divided into electric arc welding pipe, high-frequency or low-frequency resistance welding pipe, gas welding pipe, furnace welding pipe, bonded pipe and so on. According to the shape of welded seam can be divided into straight seam welded pipe and spiral welded pipe. Electric welded steel pipe is used in oil drilling and machinery manufacturing, etc. Furnace welded pipe can be used as water gas pipe. Furnace welded pipe can be used as water and gas pipe, etc. Large diameter straight seam welded pipe is used for high-pressure oil and gas transportation, etc. Spiral welded pipe is used for oil and gas transportation, piles, piers and so on. Welded steel pipe is lower in cost and higher in production efficiency than seamless steel pipe.