Steel in Construction: A Deep Dive into its Most Common Uses and Benefits

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Metallurgy

02/01/2022

Common uses of steel in construction

Designation of standardised structural steels. These are structural steels designated on the basis of their use and their mechanical or physical characteristics. R (MPa): breaking strength in MPa Re (MPa): apparent yield strength in MPa.

ABCDEF
1
Symbolic designationNumerical designationPrevious national designationR (MPa)Re(MPa)
2
3
S 18510035A 33370160
4
S 235 10037E 24420225
5
S 27510044E 28450260
6
S 35510045E 36520340
7
E 29510050A 50500275
8
E 33510060A 60600330
9
E 36010070A 70730360

Note: If the casting is made of commonly used steel, the above designation must be preceded by the letter G. Example: machined part: S185, casting GS 185

Structural steel for heat treatment (manganese content: Mn ≥ 1%)

ABCDEFGHI
1
Symbolic designationNumerical designationPrevious national designationR (MPa)Re(MPa)Main properties
2
3
C 221.1151XC18440.640330Malleable, weldable steels. Case hardening steels.
Forged and drop-forged parts.
4
C 251.1158XC25490.630365
5
C 301.1178XC32570.760430Steels that allow: resistance to wear, treatment in the mass, water quenching in general, oil quenching for small sections.
6
C 351.1181XC38630.830490
7
C 401.1186XC42670.880520
8
C 451.1201XC48710.935550Steels that allow :
Oil hardening for small and medium sections.
9
C 551.1203XC55750.980585
10
Structural steels for heat treatment [quenching - tempering] (content of alloying elements < 5 %)
11
Symbolic designationNumerical designationPrevious national designationSymbolic designationNumerical designationPrevious national designation
12
13
25CrMo41721825CD436NiCrMo16.101677335NCD16
14
34CrMo41722034CD451CrV41815950CV4
15
42CrMo41722542CD434Cr41703332C4
16
37Cr41703438C442Cr21700638C2