Russian standard seamless pipe grade

 　　GOST9941-81，GOST8374-75，GOST 8731-74, 8732-78 (st.10, 20, 09G2S)，GOST 550-75





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Japanese Standard (1)

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 　　In the grades of Japanese steel (JIS series), ordinary structural steel mainly consists of three parts to represent the material. 　　For example, S (Steel) represents steel, F (Ferrim) represents iron; The second part represents different shapes, types, and uses, such as P (Plate) for plates, T (Tube) for tubes, and K (Kogu) for tools; The third part represents the characteristic number, which is generally the tensile strength. For example, SS400 represents Steel, the second S represents Structure, 400 represents the lower limit tensile strength of 400MPa, and the overall represents ordinary structural steel with a tensile strength of 400MPa.
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Stainless steel magnetic standard

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 　　The stainless steel grade plays a role in influencing factors, but generally speaking, stainless steel alloys have magnetism, and they must meet the following requirements: 　　The alloy must contain iron (Fe). 　　The crystal structure of stainless steel alloy must be arranged in martensite or ferrite structure. 　　Firstly, as stainless steel is a type of steel, its chemical composition must contain iron. This makes stainless steel magnetic. 　　The second requirement is that the crystal structure of stainless steel must be arranged into ferrite or martensite structure. If stainless steel is mainly composed of austenitic structure, it will not have magnetism. 　　As we have already mentioned, corrosion resistance is not related to magnetism. In stainless steel, corrosion resistance depends on the concentration of chromium (sometimes molybdenum). The more each, the better the corrosion resistance.
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Differences between 304 and 316 stainless steel

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 　　Austenitic stainless steel is usually used when selecting stainless steel that must withstand corrosive environments. Austenitic stainless steel contains a large amount of nickel and chromium, which has excellent mechanical properties and corrosion resistance. In addition, many austenitic stainless steels are weldable and formable. The two more commonly used austenitic stainless steel grades are 304 and 316. To help you determine which brand is suitable for your project, this blog will study the differences between 304 and 316 stainless steel 　　304 stainless steel 　　Grade 304 stainless steel is usually considered the most common austenitic stainless steel. It contains high nickel content, usually between 8% and 10.5% by weight, while chromium content is high, about 18% to 20% by weight. Other major alloying elements include manganese, silicon, and carbon. The rest of the chemical composition is mainly iron. 　　The large amount of chromium and nickel gives 304 stain...
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