A Guide to EN10027 Steel Names.pdf
Transcript of A Guide to EN10027 Steel Names.pdf
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A GUIDE TO EN10027 STEEL NAMES
Steels produced to EN standards for example pressure vessel steels such as
P355 or structural steels S275 have names that tell you a lot about the steel
without having to look the details up in the relevant standard. The way that they
are named in set out in EN 10027 and by following a few simple rules you should
soon be a master of know steel properties from the grade alone
This page tells you about how to decipher these steel names for some common
grade of pressure vessel and structural steels that we have in stock. Once you
know how it works it is easy to use.
Structural and pressure vessel steels have a standardised naming convention
and this is laid out in EN 10027 Designation System for Steels.
Whilst both are similar they are each subtly different and it is important to know
what all the components of a steel name mean
EN STRUCTURAL STEEL NAMES TO EN 10027
The first letter S standards for Structural. P stands for Pressure and this is the
way you initially tell the grades apart.
The next set of 3 digits gives the steels minimum yield strength. So S355 has a
minimum yield strength of 355 MPa for the smallest thickness range covered by
the relevant standard i.e. EN10025.
These are the basics. You can then have up to 3 groups of characters providing
more information.
The first group concerns the impact testing of the steel what joule value (J, K or
L) and at what temperature. (R,0,2,3,4,5,6) J = 27J
K = 40J
L = 60J
and R = 20 C (Room Temperature)
0 = 0 C
2 = -20 C
3 = -30 C
4 = -40 C
5 = -50 C
6 = -60 C
An easy way of remembering the temperatures is that each increase in the digit
means another 10 degrees below zero.
So S355K2 Steel is a structural steel with 355 MPa yield strength with an impact
test of 40J at -20 C
Then you can get a number of additional symbols M Thermomechanically rolled or produced by TMCP S355 M N Normalised or normalised rolled S355 J2+N Q Quenched S690Q
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G other characteristics Usually used for offshore steels and followed by upto 2 digits i.e. S355G10
L Low Temperature S355 NL W Weather resistant S355J0W +Z35 - through thickness property; minimum reduction of area = 35 %
+AR as rolled
EN PRESSURE VESSEL STEEL NAMES TO EN 10027
The first letter P standards for Pressure. S stands for Structural and this is the
way you initially tell the grades apart.
The next set of 3 digits gives the steels minimum yield strength. So P355 has a
minimum yield strength of 355 MPa for the smallest thickness range covered by
the relevant standard i.e. EN10028
For pressure vessel steels you get fewer letters than for structural steels. These
include: M Thermomechanically rolled N Normalised or normalised rolled P355NL1 Q Quenched and tempered G Other characteristics - P355GH H High temperature - P355NH L Low Temperature P355NL2 R Room temperature
So P355 NL2 is a Pressure vessel steel with a 355MPa minimum yield which is
normalised and is for low temperature use. The 2 indicates that it is the second
category of low temperature use