Carbon Steels

Building steels expressed in terms of tensile strength are steels used in bridge construction, vehicle making, steel construction and machine construction mostly in rolled condition and in part as normally annealed, in view of tensile strengths and yielding point values. Since those steels are defined as unalloyed steel, although their mechanical particularities depend mostly on carbon amount; manganese, silicon, copper and sulfur elements derived from production raw materials and methods and particularly nitrogen and phosphor are still important.


CHEMICAL COMPOSITION
Material No Symbol Form of casting * heat treatment ** C N max Al max P max S max
1.0035 St33 - U,N - - - - -
1.0037 St37-2 - U,N 0,17 (max) 0,007 - 0,05 0,05
1.0116 St37-3 RR U,N 0,17 (max) - 0,02 0,04 0,04
1.0044 St44-2 R U,N 0,21 (max) 0,007 - 0,05 0,05
1.0144 St44-3 RR U,N 0,20 (max) - 0,02 0,04 0,04
1.0570 St52-3 RR U,N 0,20 (max) - 0,02 0,04 0,04
1.0050 St50-2 R U,N 0,30 (max) 0,007 - 0,05 0,05
1.0060 St60-2 R U,N 0,40 (max) 0,007 - 0,05 0,05
1.0070 St70-2 R U,N 0,50 (max) 0,007 - 0,05 0,05

* )U: Boiling cast R: tranquil cast RR: special tranquil cast
**)U: hot rolled not processed otherwise N: normal annealed

MECHANICAL PARTICULARITIES OF GENERAL STRUCTURE STEELS

    Tensile strength (Rm) Yielding point (Re)   Rupture elongation (A) Folding ** (180ᵒ)          
    < 3
mm
≥3
≤100
mm
≤16
mm
≥16
≤40 mm
≥40
≤43
mm
≥63
≤80
mm
≥80
≤100 mm
  ≥3
≤40
mm
≥40
≤43
mm
≥63
≤80
mm
≤3
mm
≥3
≤63
mm
≥63
≤100
mm
ISO heat
treatment
  ≥10
≤16 mm
≥16
≤63
mm
≥63
≤100
mm
Material No Symbol Mpa ≥ Mpa method* ≥ %       *** ᵒC ≥J
1.0035 St33 310
540
290
510
185 175 - - -
18
16
- - 2,5a
3a
3a
3,5a
- U,N - - - -
1.0037 St37-2 360
510
340
470
235 225 215 205 195
26
24
25
23
24
22
0,5a
1,5a
1a
2a
1,5a
2,5a
U,N 20 27 - -
1.0116 St37-3 360
510
340
470
235 225 215 215 215
26
25
25
24
24
23
0,5a
1,5a
1a
2a
1,5a
2,5a
U
N
0
-20
27
27
27
27
23
23
1.0044 St44-2 430
580
410
540
275 265 255 245 235
22
20
21
19
20
18
2a
2,5a
2,5a
3a
3a
3,5a
U,N 20 27 27 -
1.0144 St44-3 430
580
410
540
275 265 255 245 235
22
20
21
19
20
18
2a
2,5a
2,5a
3a
3a
3,5a
U
N
0
-20
27
27
27
27
23
23
1.0570 St52-3 510
680
490
630
355 345 335 325 315
22
20
21
19
20
18
2a
2,5a
2,5a
3a
3a
3,5a
U
N
0
-20
27
27
27
27
23
23
1.0050 St50-2 490
660
470
610
295 285 275 265 255
20
18
19
17
18
16
- - - U,N - - - -
1.0060 St60-2 590
770
570
710
335 325 315 305 295
16
14
15
13
14
12
- - - U,N - - - -
1.0070 St70-2 690
900
670
830
365 355 345 335 325
11
10
10
9
9
8
- - - U,N - - - -


→ : in line with shaping ↑: Perpendicular to shaping
a: material thickness
U: hot rolled not processed otherwise N: normal annealed

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