EN 10027 Designation Systems for Steel Steel Names Numbers
EN 10027-1:1992 Designation systems for steel Steel names, principal symbols
This is a steel material designation system based on names. These names consist of alpha numerical characters and define two main groups of steel
Steel Designated On The Basis Of Their Use And Their Mechanical Properties.
Steels Designated On The Basis Of Their Chemical Composition ....
—Non alloy Steels ..The relevant coding consists of a C followed by two numbers = 100 x Carbon content.
—Non alloy Steel with Manganese content => 1%, non alloy free cutting steels and alloy steels except HSS where content of all alloys =< 5%... The relevant coding consists of 100 x Carbon % content then Chemical symbols indicating most important alloys then number indicating the associated % contents.
—Alloy Steels.. The relevant coding consists of an X then 100 x Carbon % content then chemical symbol indicating most important alloys. then numbers indicating the associated % contents. e.g. X2CrNi18-9 designates a stainless steel whose average contents in carbon, Chromium and Nickel are about 0,02%, 18% and 9% respectively.
EN 10027-2:1992 Designation systems for steels. Steel numbers
The other system is a numerical system. The steel numbers consist of 1 followed by a point and 4 figures. As an example the steel numbers of the above-mentioned steels are 1,8836 and 1,4307. The steel numbers are allocated by a European Registering Office. The registering authority has been given to VDEh in Dusseldorf.
Various number ranges identifying the general number trends are listed below
Note: XX numbers (01-99)are allocated sequentially
Carbon Steels
Number = 1.00XX (& 1.90XX )..Base Steels
Number = 1.01XX(& 1.91XX )..Quality Steel (General structural steels with Rm < 500MPa )
Number = 1.02XX(& 1.92XX )..Other Structural Steels (Not intended for heat treatment with Rm < 500MPa )
Number = 1.03XX(& 1.93XX )..Steels with average C< 0,12% or Rm < 400 MPa
Number = 1.93XX..Steels with average C< 0,12% or Rm < 400 MPa
Number = 1.04XX(& 1.94XX )..Steels with average C >= 0,12% < 0,25% or Rm ≥ 500 MPa
Number = 1.05XX (& 1.95XX )..Steels with average C >= 0,25% < 0,55% or Rm ≥ 500MPa < 700 MPa
Number = 1.06XX(& 1.96XX )..Steels with average C > 0,55% or Rm ≥ 700 MPa
Number = 1.07XX (& 1.97XX )..Steels with higher P or S content
Special Carbon Steels
Number = 1.10XX (& 1.90XX ) ..Special steels (Steels with special physical properties )
Number = 1.11XX ..Special steels (Structural Pressure vessel and engineering steels with C < 0,5% )
Number = 1.12XX(& 1.90XX ) ..Special steels (Structural Pressure vessel and engineering steels with C ≥ 0,5% )
Number = 1.13XX ..Special steels (Structural Pressure vessel and engineering steels with special requirements
Number = 1.14XX..Special steels
Number = 1.15XX to 1.18XX..Tool steels
Number = 1.19XX..Special steels
Alloy Steels
Number = 1.08XX(& 1.98XX )..Steels with special physical properties
Number = 1.09XX(& 1.99XX )..Steels for other applications
Number = 1.2000-1.2999-..Tool Steels
[ Number = 1.20XX.. Tool Steels-Cr
Number = 1.21XX..Tool Steels-(Cr-si , Cr-Mn ,Cr-Mn-Si,
Number = 1.22XX..Tool Steels-(Cr-V , Cr-V_Si ,Cr-V-Mn,Cr-V-Mn_Si
Number = 1,23XX..Tool Steels .. (Cr-Mo, Cr-Mo-V, Mo-V )
Number = 1,24XX..Tool Steels .. (W, Cr-W)
Number = 1,25XX..Tool Steels .. (W-V, Cr-W-V)
Number = 1,26XX..Tool Steels .. (other W)
Number = 1,27XX..Tool Steels .. (with Ni)
Number = 1,28XX..Other Tool Steels )
Number = 1,29XX..Other Tool Steels ]
Number = 1.3000-1.3999..Special Steels -Miscellaneous Steels
Number = 1,35XX..Miscellaneous Steels.. (Bearing Steels)
Number = 1,39XX..Steels with special physical properties with Ni
Number = 1.4000-1.4999..Special Steels -Stainless and Heat Resisting
Number = 1.43XX..Stainless Steels ( >= 2.5% Ni but without Ni, Mo & Ti)
Number = 1.44XX..tainless steel with <= 2,5% Ni and Mo, but without Nb and Ti)
Number = 1.5000-1.8999..Special Steels -Structural, pressure vessel and engineering steels
Number = 1.51XX..Structural,Pressure Vessel,Engineering Steels . (Mn-Si, Mn-Cr Steels)
Number = 1.61XX..Special steels, structural, Pressure Vessel and Engineering steels
Number = 1.70XX..Cr, Cr-B
A number of letters with their mechanical properties identifiers are listed below
| Letter |
Steel Use |
Mechanical Property... |
| S |
Structural Steel |
Minimum Yield Strength |
| P |
Pressure Purposes |
Minimum Yield Strength |
| L |
Line Pipe |
Minimum Yield Strength |
| E |
Engineering |
Minimum Yield Strength |
| B |
Reinforcing Steel |
Characteristic Yield Case |
| Y |
Pre-stressing Steel |
Minimum Yield Case |
| R |
Rails |
Minimum Yield Case |
| H |
High Strength Cold Rolled |
Minimum Yield Case |
| D |
Flat Products for Cold Forming |
C, D or X followed by two numbers characterising steel |
| T |
Tinmill Products |
Nominal Yield Case |
| M |
Electrical Steel |
Number = 100 x specific loss in W/kg, "—"
Number = 100 x nom thick in mm
Letter for type of steel (A,B,E,N,S or P) |
e.g. S420 designates a structural steel with a specified yield strength of 420MPa(420)
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