Steel Tube Handbook - 2018

5 Element Weight proportion in% 1 2 Al Aluminum 0,30 B Boron 0,0008 Bi Bismuth 0,10 Co Cobalt 0,30 Cr Chrome 0,30 0,50 Cu Copper 0,40 0,50 La Lanthanide (each) 0,10 Mn Manganese 1,65 1,80 Mo Molybdenum 0,08 0,10 Nb Niobium 0,06 0,08 Ni Nickel 0,30 0,50 Pb Lead 0,40 Se Selenium 0,10 Si Silicon 0,60 Te Tellurium 0,10 Ti Titan 0,05 0,12 V Vanadium 0,10 0,12 W Tungsten 0,30 Zr Zircon 0,05 0,12 Other elements (except: carbon, phos- phorus, sulfur, nitrogen), (each) 0,10 The coefficients for the determination of the eigenvalues for the alloying elements content Note - Alloy Steel: 1 Is defined also in EN 2 Applies cast analysis 3 Minimum content of each element - see table 4 If there is the highest content of an element given, than for classification use 70% of this value (with the excep- tion for Mn) Element Coeficient Cr, Co, Mn, Ni, Si, W 4 Al, Be, Cu, Mo, Nb, Pb, Ta, Ti, V, Zr 10 Ce, N, P, S 100 B 1000 Steel for tubes Definition and classification of steel according to EN 10020 - steel is defined as: • material where weight portion of iron is higher than that of any other element • content of carbon (C) is less than 2%, which is the current limit between steel and cast iron (except some Cr-steel, which may also contain more than 2%) • steel contains other elements listed in the following table. Table shows limit values for the elements of unalloyed and alloyed steel - column. No. 1 Limit values of chemical composition quality and grade steel - column. No. 2 System for steel marking for tubes according to EN EN 10027-1 identification systems of steel. (ISO / TS 4949) Abbreviated designation system. The basic symbols EN ECISS IC10 The supplementary symbols EN 10027-2 System of number marking According to EN 10027-1 steel grades are divided into two main groups: • Group 1 - Steel designated according to the usage and mechanical or physical properties • Group 2 - Steel designated according to chemical com - position. These are divided into four sub-groups. Group 1 S - structural steel for general use P - steel for pressure purposes L - steel for pipelines E - steel for machine parts (subsequent number indicates the minimum yield strength in N/mm2) B - steel for the reinforcement of concrete Y - steel for prestressed concrete reinforcing R - steel for rails H - flat cold rolled products D - flat products made of mild steel for cold forming T - sheets and strips M - sheets and strips for electrical purposes For tubes are used the first four types of steel Group 2 - has 4 subgroups • non-alloy steel (with regulated content of C) - marking: letter C and the number corresponding to one hundred times the mean range of the prescribed range for the con- tent of carbon (C22) • non-alloy steel with the content of Mn> 1% and alloy steel with content of individual alloying elements below 5% - marking: a) the number corresponding to the hundredfold carbon content b) chemical symbols of alloying elements in order of decreasing content of elements c) numbers, which are defined by the alloying elements. Mean element content multiplied by the factor from the table and rounded to the higher whole number (25CrMo4). • alloy steel with alloying addition (at least one element above 5%) - marking: a) typical letter X (X11CrMo9-1) b) number - one hundred times the mean carbon content c) chemical symbols of alloying elements d) numbers, which are defined by the alloying elements. Mean element content rounded off to the higher who- le number. • speed steel - designation a) typical letters HS (HS 6-5-2) b) numbers, which are defined by the alloying elements