Steel Tube Handbook - 2018

119 Designation system for steels - EN 10027-2 1 . XX XX(XX) Sequential number (digits in brackets are for possible future use) Steel group number Material group number 1 = Steel Steel groups Steel group number Characteristic Non-alloy steels B Base steels 00 or 90 base steels Q Quality steels 01 through 06 or 91 through 96 quality steels are divided into groups according to the maximum strength Rm and the average carbon content 07 or 97 free-cutting steel S Special steels 10 steels with special physical properties 11, 12, 13 structural, pressure and engineering steels 15, 16,17,18 tool steels Alloy steels QS Quality steels 08, 09 or 98, 99 steels with special physical properties and steels for other applications SS Special steels 0 20 21, 22, 23 24 až 26 27 28 tool steels - alloyed Cr - alloyed Cr+Si, Mn, V, Mo - alloyedé W+Cr, V - alloyed Ni - other 32, 33 35 36, 37 38, 39 miscellaneous steels - high speed steels - bearing steels - materials with special megnetic properties - steels with special physical properties 40, 41, 43, 44 45 46 47, 48 49 stainless and heat resisting steels - stainless steel sorted according to the content of Ni - stainless steel with special additions - chemical resistant and high temp Ni alloys - heat resistant steels - material with elevated teperature properties 50 až 53 54 55 56 57, 58, 59, 60 62, 63 65, 66, 67, 68, 69 70 71 72, 73 75, 76, 77 79, 80, 81, 82, 84 85 87 88, 89 structural, pressure vessel and engineering steels - alloyed Mn+Si,Cu, Cr, V, Ti - alloyed Mo, Nb, Ti, V, W - alloyed B, Mn-B - alloyed Ni - alloyed Cr-Ni - alloyed Ni and other elements Si, Mn, Cu, Mo, Mn, V - alloyed Cr - Ni - Mo and other elements - alloyed Cr a Cr-B - alloyed Cr+Si, Mn, B - alloyed Cr-Mo - alloyed Cr+V, Mo - alloyed Cr+Si, Mn, Mo,V, Ti, W - nitriding steels - steels not for treatment by user - high strengt weldable steels not for heat treatment by user Table 57