Essential details
Shipping:Ocean freight
Product Introduction
Categories:
The steel pipe is divided into two categories: seamless steel pipe and welded steel pipe (welded pipe). According to the section shape can be divided into round pipe and shaped pipe, widely used is round steel pipe, but there are also some square, rectangular, semicircular, hexagonal, equilateral triangle, octagonal and other shaped steel pipe
For the steel pipe under fluid pressure to carry out hydraulic tests to test its pressure resistance and quality, under the specified pressure does not leak, wet or expansion qualified, some steel pipe also according to the standard or the requirements of the demander flange test, flaring test, flattening test.
Seamless stainless steel pipe, also known as stainless steel seamless pipe, is made of steel ingot or solid tube blank perforated into a tube, and then made of hot rolled, cold rolled or cold drawn. The specifications of the seamless steel pipe are expressed by the outer diameter * the wall thickness of millimeters.
304 stainless steel pipe full name SUS304 stainless steel pipe
SUS304 stainless steel pipe belongs to the American grade of stainless steel pipe, the domestic grade is equivalent to 0Cr19Ni9 stainless steel pipe, usually replaced by 0Cr18Ni9.
The mechanism of stainless steel rust prevention is that the alloying elements form a dense oxide film to isolate oxygen contact and prevent continued oxidation. So stainless steel is not "stainless".
304 material rust phenomenon, there may be the following reasons:
1. Chloride ions exist in the environment.
Chloride ions are widely present, such as salt, sweat, sea water, sea breeze, soil and so on. Stainless steel in the presence of chloride ions in the environment, corrosion quickly, even more than ordinary mild steel.
Therefore, there are requirements for the use of stainless steel environment, and it is necessary to wipe frequently, remove dust, and keep clean and dry.
316 and 317 stainless steel (317 stainless steel properties see below) are molybdenum containing stainless steel. The molybdenum content of 317 stainless steel is slightly higher than that of 316 stainless steel. Due to the molybdenum in the steel, the overall performance of the steel is better than 310 and 304 stainless steel, under high temperature conditions, when the concentration of sulfuric acid is lower than 15% and higher than 85%, 316 stainless steel has a wide range of uses. 316 stainless steel also has good chloride erosion properties, so it is usually used in Marine environments.
With the development of social economy, the application of stainless steel pipe has also been more and more widely popularized. Will bring new changes in every field.
Theoretical weight of stainless steel pipe :W= outer diameter - wall thickness x wall thickness x0.02491 Calculation method of stainless steel pipe Outer diameter - wall thickness x wall thickness x0.02491.
Production process: a. Round steel preparation; b. Heating; c. Hot rolling perforation; d. cut the head; e. Pickling; f. Grinding; g. Lubrication; h. Cold rolling processing; i. degreasing; j. Solution heat treatment; k. Straightening; l. Cut the tube; m. pickling; n. Finished product inspection.
Identification method:
Number and representation:
① Use the international chemical element symbol and the national symbol to indicate the chemical composition, and use the Arabic alphabet to indicate the component content:
For example: China, Russia 12CrNi3A
② Use fixed digit numbers to represent steel series or numbers; Such as: United States, Japan, 300 systems, 400 systems, 200 systems;
③ Use the Latin alphabet and order to form the serial number, only to indicate the purpose.
Rules of our country
① Use element symbols
② Use, Chinese Pinyin, open-hearth steel :P, boiling steel :F, killed steel :B, Class A steel :A, T8: special 8,
GCr15: Ball bearing
1. Binding steel, spring steel, such as :20CrMnTi 60SiMn, (with a few parts per 10,000 to indicate C content)
2. Stainless steel, alloy tool steel (with a few thousandths of C content), such as :1Cr18Ni9 thousandth (i.e
0.1%C), stainless C≤0.08% such as 0Cr18Ni9, ultra-low carbon C≤0.03% such as 0Cr17Ni13Mo
International approach
The American Iron and Steel Institute uses three digits to label various standard grades of malleable stainless steel. Among them:
① Austenitic stainless steel with 200 and 300 series of digital marks,
② Ferrite and martensitic stainless steel are represented by 400 series numbers. For example, some of the more common austenitic stainless steels
Marked 201, 304, 316, and 310,
③ Ferritic stainless steel is marked with 430 and 446, and martensitic stainless steel is marked with 410, 420 and 440C
Remember, biphase (austenite-ferrite),
Stainless steel, precipitation-hardened stainless steel and high alloys with an iron content of less than 50% are usually named by patent names or trademarks.
Application prospect:
Precision stainless steel pipe reliable, health, environmental protection, economic application, the thin wall of the pipeline and the successful development of a new reliable, simple and convenient connection method, so that it has more advantages that other pipes cannot be replaced, the application in the project will be more and more, the use will be more and more popular, and the prospect is promising.
With the implementation of China's reform and opening policy, the national economy has been growing rapidly, and a large number of urban housing, public buildings and tourist facilities have been built, which puts forward new requirements for hot water supply and domestic water supply. Especially the problem of water quality, people pay more and more attention to, and the requirements are constantly improving. Galvanized steel pipe this commonly used pipe because of its corrosivity, under the influence of relevant national policies, will gradually withdraw from the historical stage, plastic pipe, composite pipe and copper pipe has become the commonly used pipe of pipeline system. However, in many cases, stainless steel pipes are more advantageous, especially thin-walled stainless steel pipes with a wall thickness of only 0.6~1.2mm in the optimal drinking water system, hot water system and the water supply system that puts health in front of it, which has the characteristics of reliability, health, environmental protection and economic applicability. It has been proved by domestic and foreign engineering practice that it is one of the pipes with good comprehensive performance of water supply system, new type, energy saving and environmental protection, and it is also a very competitive water supply pipe, which will certainly play an incomparable role in improving water quality and improving people's living standards.
In the building water supply system, due to the galvanized steel pipe has ended a hundred years of brilliant history, a variety of new plastic pipes and composite pipes have been rapidly developed, but there are still some deficiencies in various degrees of pipe, far from fully adapt to the needs of the water supply system and the country's requirements for drinking water and related water quality. Therefore, relevant experts predict: building water supply pipes will return to the era of metal pipes. According to the application experience of foreign countries, the thin-walled stainless steel pipe is identified as one of the pipes with better comprehensive properties.
The above content is organized by Jiangsu stainless steel pipe manufacturer.