Now it is difficult to underestimate the demand for stainless steel in various spheres of human activity.The most popular types of stainless steel are stainless steel sheet and stainless pipe.Stainless steel tubes may be round and profiled.To the profile include stainless steel pipes with square and rectangular section.
main consumers of stainless steel are the food, chemical, petroleum and energy industries, as well as engineering and construction.Stainless steel is popular because of its inherent superior qualities, the main of which is its high resistance to aggressive media.Besides products of stainless steel have a worthy aesthetic properties, which leads to their use for the finishing of the various elements of the interior and exterior.
Furthermore geometrical differences (length, width, thickness or tube wall) and the difference in polishing a stainless steel chemical composition varies inherent in a particular grade of steel.In order that consumers can see the brand become a certain type of stainless steel, there is a marking of stainless steel, which is a combination of letters and numbers.
currently in use three basic labeling: Russian mark GOST, EN / DIN and AISI, which are used in the US and Europe.The principle of the Russian markings consider the following example: 12X18H10T.The first two digits (12) indicate the average carbon content in tenths percent (in this case - 0.12%).If there are no numbers in front, it means that this type of steel contains one or more of carbon.Next is the letter corresponding to a particular chemical elements (symbols that can be easily found on the Internet or literature).For example, nitrogen (N) is designated by the letter A, aluminum (Ai) is denoted by the letter S, beryllium (Be) is denoted by the letter A, boron (B), - the letter P, vanadium (V) is designated by the letter F, tungsten (W) designated by the lettersWee, gallium (Ga) is designated by the letter B, iridium (Ir) and denoted by the letter, cadmium (Cd) designated by the letters cd, cobalt (Co) is designated by the letter K, silicon (Si) is designated by the letter C, magnesium (Mg) is designated by the letter W, lead (Pb) is denoted by the letters SS, copper (Cu) is designated by the letter D.
figures, following this letter, indicate the average content of this element as a percentage.In this case, X18 means that the steel contains 18% chromium.The absence of the letter numbers mean content of the element in the steel in an amount of 1 - 1.5%.The following (in our case) H10 say about ten percent nickel content.Well, the last letter T without numbers showing the presence of stainless steel of the brand 1.5% titanium.
The labeling system EN / DIN, in contrast to Russia, first lists all the chemical elements that make up, and then specify the content of their mass.On the first digit can be judged on the average carbon content.If we have a stainless steel pipe (for example) on which type marking H5SrNi18-10 present, it indicates that the pipe is made of steel which contains 0.05% carbon, 18% chromium and 10% nickel.
The marking of the American Institute of Steel and Alloys AISI there are three numbers, and in some cases, one - three letters that follow them.The first digit refers to the class of steel (2 or 3 - austenitic, 4 - ferritic or martenistye), second and third digits indicate the serial number of the stainless steel band.Behind the statistics may indicate the following letter: L - low carbon content, S - normal carbon content, N - the presence of nitrogen, F - the high content of sulfur and phosphorus, B - silicon additive, Cu - the presence of copper.
