Special Profiles - Hot-Rolled Boron Flats
Technical Characteristics
GENERAL FEATURES
TYPE
Hot-Rolled Bars of rectangular cross-section (Flats)
STEEL GRADE
RSt 37-2 according to DIN 17100 (S235JR according to EN10025)
RSt 44-2 according to DIN 17100 (S275JR according to EN10025)
15B35 Modified (see below)
35Mn5 Modified (see below)
FORM-DIMENSIONS
Straight bars with Width form 80 to 180 mm, and Thickness from 25 to 90 mm
LENGTH - TOLERANCESBar length: 6 to 12 m with +/- 75 mm tolerance
PACKING - WEIGHTBundles. Weight up to 5,200 Kg per bundle
DIMENSIONS, WEIGHT & TOLERANCESAccording DIN 1017

Steel Chemical Composition
Steel Grade
C (%)
Mn (%)
Si (%)
Cr
S (%) max
P (%) max
B (%)
RSt 37-2
0.20 max
1.40 max
-
0.045
-
RSt 44-2
0.21 max
1.40 max
-
0.045
-
15B35 Mod.
0.27 - 0.35
1.00 - 1.60
0.15 - 0.35
0.25 - 0.65
0.025
0.020
0.0005 - 0.0050
30Mn5 Mod.
0.30 - 0.34
1.25 - 1.50
0.15 - 0.35
0.30 - 0.50
0.020
0.025
0.0005 - 0.0040

Mechanical Properties
Steel Grade
Nominal Thickness (mm)
Sample
Yield Strength
(N/mm2) min
Tensile Strength
(N/mm2)
Elongation
5d0, (%)
Charpy -V- Notch Impact - j
(test at -20° C)
RSt 37-2
24-40
as rolled
225
340-470
26
-
41-63
25
> 63
215
24
RSt 44-2
25-40
as rolled
265
410-540
22
-
41-63
255
21
> 63
245
20
15B35 Mod.
25-90
quenched & tempered
827
950 min
12
27 j min
as rolled
-
700 min
-
-
30Mn5 Mod.
25-90
quenched & tempered
750
900-1,100
-
27 j min

Hardenability, HRC
Steel Grade
Thickness (mm)
1.5
5.0
9.0
13.0
15.0
20.0
25.0
30.0
35.0
15B35 Mod.
Up to 50
max
58
-
-
55
-
50
-
-
-
min
51
-
-
41
-
33
-
-
-
51-71
max
58
-
-
-
55
53
-
-
-
min
51
-
-
-
41
33
-
-
-
> 70
max
58
-
-
-
-
55
51
-
-
min
51
-
-
-
-
41
34
-
-
30Mn5 Mod.
25-90
max
55
55
54
53
52
48
44
39
36
min
47
46
42
36
33
27
23
20
-

Dimensions, Weight and Tolerances
Width (mm)
Allowed Width
Deviation (mm)
Thickness
25
30
35
40
45
50
60
65
70
75
80
90
Permissible Thickness Deviation (mm)
+/- 1.0
1.5 +/-
Nominal Weight (Kg/m)
80
1.5
-
-
-
25.12
-
-
-
-
-
-
-
-
100
-
23.55
27.47
31.40
35.72
39.25
47.10
-
-
-
-
-
110
2.0
-
-
-
34.54
-
-
-
-
-
-
-
-
120
-
-
-
37.68
42.39
47.10
-
-
-
-
-
-
125
2.5
-
-
-
-
-
49.06
58.87
-
-
-
-
-
130
25.25
30.61
-
-
-
51.02
61.23
-
-
-
-
-
140
-
-
-
43.96
49.45
54.95
65.94
-
-
-
-
-
150
-
-
-
-
52.98
64.76
70.65
76.54
82.42
88.31
-
-
180
-
-
-
-
63.58
-
-
-
98.91
105.97
-
127.17