The German standard grade of steel representation method

A. according to the material strength of the said method This representation is only applicable to the alloy steel. The main body of the grade of steel by... St (the abbreviation of Stahl) letters and then the tensile strength of lower limit values (N/best callus induction) composition. Such as: St52 - tensile strength not less than 510 n / 111 m2 (510 mpa) non alloy steel. B. according to the chemical composition of the said method This representation method and can be divided into the alloy steel, low alloy steel and high alloy steel three types. The alloy steel: For carbon steel, it only in use, when the steel other than performance tensile strength is more important, or steel need user heat treatment (such as carburizing steel, hardened and tempered steel), just made according to the chemical composition of the said method. Brand is the main body by carbon symbol "C" and later said the average carbon content of a few hundredths digital composition, Such as: C15, C15E - average carbon (mass fraction) 0.15% of carburizing steel, the latter "E" said after carburizing and quenching of. C35, C35N - average carbon (mass fraction) 0.35% of the quenched and tempered steel, the latter "N" is said by the fire. According to the carbon turbulent steel of different quality requirements (to phosphorus, sulphur content restrictions degree) and different purposes, but also in the grade of steel beginning with Ck, Cm, Cf, Cq letters, etc. Such as: CXX - in steel W (P), W (s) or less 0.045% (* * says the average carbon content of a few hundredths of digital, similarly hereinafter). Ck x - control sulfur and phosphorus content of high quality steel. Cm x - control sulfur content of high quality steel, steel w (s) by 0.020% ~ 0.035%. Cf x - surface hardening steel. Cq x - cold heading steel. Low alloy steel: Brand is the main body said carbon content for a few hundredths of digital, alloy element symbols and said alloy element content value of the digital composition. Alloy element using chemical symbol, and according to the content of lined up how much, When the content at the same time, phase in alphabetical order arrangement. Alloy element content value of the said method see table 2. Alloy elements Index (average content of the dispersion times) Cr Co Mn Ni Si W Al Cu Mo Nb Ta Ti V C N P S 4 ten 100 Due to the brand HuZhong symbol of element figures, and alloy element is that the average content and table 2 index of product, so desire the brand of the chemical composition, should be divided by the original index. Such as: 13 cr2 - says the average carbon (mass fraction) 0.13%, average chrome (mass fraction) (2 ÷ 4) % = 0.5% chromium steel; 25 crmo4 - says the average carbon (mass fraction) 0.25%, average chrome (mass fraction) (4 ÷ 4) % = 1%, still contain molybdenum chrome molybdenum steel. In some drawings or material, such as need to specify their heat treatment state, used the table 1 as stipulated in the representative letter. High alloy steel: Brand began with the letter "X", said for high alloy steel} the said steel average carbon content for a few hundredths of digital and according to how much content tactic alloy elements of the chemical symbol; The last is to indicate the main alloying element content of average percentile (in four pieces of five people into integer). Such as: X10CrNi188 - w (c) 0.10%, w (Cr) is 18%, w (Ni) for 8% of the stainless steel. If the carbon content not important and don't have marked by the letter "X" can be omitted. Carbon tool steel: The grade of steel body, and the non alloy steel representation method is consistent, is by the letter C and said the average carbon content of digital composition, behind plus "w ×" in order to distinguish the quality of steel and use. Such as: C * * w1 - in steel w (P), w (S) or less 0.020%. Shit x says the average carbon content of a few hundredths of digital, w said tool steel. C * * W2 - in steel w (P), w (s) or less 0.030%, w said tool steel. C * * ws - special purpose tool steel. High speed tool steel: Brand beginning with the letter "S", said high speed tool steel; On behalf of the alloy elements behind the average content of 3 ~ 4 set of digital components, each group with short line between separated, each group Numbers in W - Mo - V - Co sequence, Cr don't have to say, Numerical alloy element content directly to the percentage of average content to say, you don't have to multiply by index; Does not contain the Mo of high speed steel, the use of digital "0" said} and does not contain the Co of high speed steel, it is only the first three group of digital representation can, don't have to use "0" said. Such as: S121-4-5, said the average w (w) is 12%, w (Mo) is 1%, w (V) is 4%, w (Co) is 5%, [w (Cr) 4%] high speed. S18-0-1, said about an average of 18% (w), do not contain the w (Mo), w (v) 1%, excluding cobalt [w (Cr) 4%] high speed steel, which is equivalent to the w18Cr4V steel in common use in our country. C. Cast steel brand representation method The beginning of words "GS -" or "G". When in need, mold casting can be in before the short add "K", centrifugal casting can be added a "Z", such as GSK - × x or GSZ - * *. On the other hand, cast steel grades representation methods and the deformation steel is the same. In the alloy cast steel can press strength or chemical composition said, and alloy cast steel can only use chemical composition said, citing is as follows: The alloy cast steel (according to the strength said) : GS - 52 - tensile strength for 5096 n/best callus induction (52 KGF/best callus induction) of cast steel; GS - L45 - tensile strength for 44 ln/best callus induction (45 KGF/best callus induction) alkali fragile cast steel. The alloy cast steel (according to the chemical composition said) : GS - C10 - carbon (mass fraction) 010% of the cast steel; GS a C10Mnsi - carbon (mass fraction) 0.10%, including high manganese content and silicon killed steel. Low alloy cast steel (according to the chemical composition said) : G