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How to decipher steel grade

How to decipher the steel grade

If you are faced with writing steels decipher which can not, do not rush to call experts in metals or rush to the library for reference tool.

Decipher brand become for you not be easy, we just need to know what letters to denote chemical elements belonging to a particular alloy.



So, the following notation elements found in the labeling are:

N - Ni, X - chrome, M - molybdenum, T - Ti K - cobalt, D - copper C - silicon, T - manganese.


steel and letter designations are used to specify the methods of deoxidation: SP - killed steel, SS - semi-killed, KP - boiling.
Their designations also have various types of steel depending on composition and destination.


Non-alloy structural steel, standard, indicated as PT. (For example, Article 4, where the number 4 after the letters indicates the carbon content in percent).


Non-alloy structural steels of high quality designated by a two-digit number, which indicates the average content of carbon steel (Article 10)


High-quality steel for the manufacture of pressure vessels and boilers represent as well as structural and non-alloyed steel, just add the letter K (for example, 20K).


Alloy structural steel represent an alphanumeric code. The numbers after the letters indicate the approximate content of the element (but when the content of dopant less than 1.5% figure is not intended).


Low content of impurities (sulfur, phosphate), designated by the letters A or W at the end of markings (eg, 17HG-III).


By marking casting structural steel at the end of the letter L. added


The designation of the building was the presenceletter C, and the numbers that correspond to the minimum yield strength steel. Additionally placed in the end of the designation T for heat strengthened rolled K for enhanced corrosion resistance, Y - to denote high copper content (e.g., 354 T C).


Instrumental unalloyed steels are divided intoquality (denoted by the letter Y, and figures showing the average carbon content, for example, U9) and high-quality, marked with the letter A is placed at the end of marking (eg U9A).
Tool steel, alloyed indicate on the labeling as well as constructional alloyed (eg, 3H2V5MF).


Marking speed steels begins withthe letter P, then there is a number indicating the tungsten content. If the vanadium content exceeds 2.5%, indicated the letter F and the corresponding number (eg, R5M6F3).


Knowing these rules, you will easily determine the composition of a steel, and for the experienced professional transcript grades of steel and does simple and straightforward matter.

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