Catalogo consumabili 2012

20
Steel grade designation
UNI EN 10027 highlights
Extract from UNI EN 10027-1:2006
This standard is a steel material designation system based on names consisting of alpha numerical characters that define two
main groups of steels:
Group 1- steels designated on the basis of their use and their mechanical properties.
Group 2- steels designated on the basis of their chemical composition
Group 1
Steels described starting from their use and their mechanical or physical characteristics.
Note :
• Pages "Steels designation system" show and complete the symbolic description rules of UNI EN 10027-1:2006.
• So as not to overload the chart, we did not present the symbol elements referring to steels particularly rarely used in
welding.
Group 2
Steels described starting from their chemical composition are divided into four categories:
1- Non alloyed steels (excluding free machining steels) with an average manganese content < 1 %. The letter C followed by
one hundred times the average content specified in percentage (e.g. C35 is a mild steel with 0,35% C)
2- Non alloyed steels with a manganese content < 1 %, non alloyed free machining steels and alloyed steels (excluding high
speed steels) of which the content of each alloy element is < 5 %. The relevant coding consists of 100 x Carbon % content
then chemical symbols indicating most important alloys then number indicating the associated % contents multiplied by a
specific factor. (e.g. 13CrMo4-5 is a 0,13% C, 1%Cr (4/4) e 0,5% Mo (5/10)steel).
3- Alloyed steels (excluding high speed steels) of which the content of at least one alloy element is < 5 %.Same principle by
using the letter X instead of Z and the chemical symbols of the alloy elements (X4CrNiMo17.12.2 stainless steel 0,04%C, 17
% Cr, 12Ni, 2% Mo).
4- High-speed steel: HS followed by %W-%Mo- %V-%Co (e.g. HS 18-0-1, W=17.5–18.5 %; Mo=max 0.6%, V=1–1.2 %)
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