Building materials, group 1 steels.

metallurgy

25/12/2021

The European standard EN 10027 groups the "steel designation systems", thus replacing the standard NF A 02 005

The European standard EN 10027 groups the "steel designation systems", thus replacing the standard NF A 02 005.
There are two European systems for designating a standardised steel (French designations are still allowed).
Symbolic designation: this is based on literal and numerical symbols and comprises two groups.
Group 1: The designation of steels in this group refers to the use and the mechanical or physical characteristics of the designated steel.
Group 2: The designation of steels in this group refers to the chemical composition.
Numerical designation: complementary to the symbolic designation, it assigns to each steel grade a characteristic number comprising 5 digits between 10 000 and 19 999.


2. Steels designated according to their use and their mechanical or physical characteristics or physical characteristics

The designation includes :
- The letter G if specified in the form of a casting, the letters PM if produced
the letters PM if produced by powder metallurgy.
- A letter :
S (Structure) for structural steel.
P for steels intended for the manufacture of pressure vessels.
L for steels intended for the manufacture of pipes.
E (Engine) for engineering steel.
B for concrete reinforcing steels.
Y for pre-stressed concrete steels.
R for steels for the manufacture of rails or in the form of rails.
D for cold-forming flat steels
H for high strength cold forming flat steels.
T for packaging steels (black iron*, tinplate, chrome iron)
M for electrical steels
- A number that expresses the minimum yield strength in N/mm2 (MPa - 3
digits in general).
- A specification expressed by a letter or a number and a letter if there is a specific quality.

ABCDEF
1
123
2
G E n n nan ...........................an...............
3
main symbolsadditional symbols
4
lettermechanical characteristicfor steel products
5
Group 1Group 2
6
7
G = cast steel
E = structural steel mechanical
nnn = specified minimum value of yield strength
(B) in MPa (C) for the lowest thickness range
other characteristics followed, if necessary, by 1 or 2 digits
or if impact resistance characteristics are specified, the rules of Group 1 of Table 1 shall apply.
C = for cold drawing
8
9
10
11
12
13
14
15
16
17
18
19
sub-group 1sub-group 2
20
breaking energytest temperature °cCspecial cold forming
21
Dgalvanising
22
27 40 50Eenamelling
23
JR KR LR20Fforging
24
JO KO LO0Hhollow profile
25
J2 K2 L2-20Llow temperature
26
J3 K3 L3-30Mthermomechanical forming
27
J4 K4 L4-40Nnormalized or normalizing rolling
28
J5 K5 L5-50Ooffshore
29
J6 K6 L6-60Qhardened and tempered
30
M = thermomechanical rolling
N = normalised or normalising rolling
Q = quenched and tempered
G = other characteristics followed, where necessary, by 1 or 2 digits
Sshipbuilding
31
Ttubes
32
Wresistant to atmospheric corrosion
33
anchemical symbol of the specified alloying element, e.g. Cu, possibly with a single digit representing 10 times the average (rounded to 0.1%) of the specified range of the content of this element.
34
35
36
37
Exemple :
38
Construction steel
39
S 235 JORE > 235 MPa
40
Kv0°C ⩾ 27J
41
symbols for special requirements (1)
42
Symbol Signification
43
,+ C (2)Coarse grain
44
,+ FFine grain
45
,+ HTempered
46
,+ Z15Guaranteed property in the direction of thickness: minimum stricture = 15%.
47
,+ Z25Guaranteed property in the direction of thickness: minimum stricture = 25%.
48
,+ Z35Guaranteed property in the direction of thickness: minimum stricture = 35%.
49
(1) These special requirements are normally characteristics of the steel. For practical reasons, they are used as symbols for steel products.
(2) The (+) sign separates from the previous symbol.
50
51
52
53
symbols for type of coating
54
,+ A (1)Hot-dip aluminizing,+ SHot dip tin coating
55
,+ ARAluminium cladding by plating,+ SEElectrolytic tin coating
56
,+ ASAluminium-silicon alloy coating,+ THot-dip lead-tin alloy coating
57
,+ AZZinc-aluminium alloy coating (>50% AL),+ TEElectrolytic lead-tin alloy coating
58
,+ CEElectrolytic chromium/chromium oxide coating,+ ZHot dip zinc coating
59
,+ CUCopper coating,+ ZAZinc-aluminium (>50% Zn) hot dip coating
60
,+ ICInorganic coating,+ ZEElectrolytic zinc coating
61
,+ OCOrganic coating,+ ZFHot dip zinc-iron coating
62
(1) the (+) sign separates from the previous symbol
63
64
symbols for type of treatment
65
,+ A (1)Softening annealing,+ NTNormalized and income
66
,+ ACCarbide globulating annealer,+ QTempered
67
,+ ATSolution annealing,+ QAAir quenched
68
,+ CCold worked,+ QOOil quenched
69
,+ CRCold rolled,+ QTQuenched and tempered
70
,+ HRHot rolled and cold worked,+ QWWater quenched
71
,+ LCSkin pass,+ SCold shearing treatment
72
,+ MThermomechanical forming,+ TTempering
73
,+ NNormalised or normalising forming,+ UUntreated
74
(1) the (+) sign separates from the previous symbol, To avoid confusion, the letter S can be used as a prefix to these symbols (+SA).
75
76
77
78
79
80
81
82