Technical data for 18MnB4 cold-drawn steel wire, compliant with EN 10263-3. View the chemical composition, mechanical properties, and related technical requirements for this grade.
Only data directly related to this material is shown here. Inspection, equipment, process and packaging information is linked separately.
1. Combinations of delivery conditions
Table 1 – Combinations of delivery conditions, product forms, and conformity requirements
Table 2 – Surface quality under delivery conditions
Surface condition upon delivery
Symbol
Bar
Rolled wire
Wire
unless otherwise agreed
hot-rolled
none or +AR
X —
X —
—
Special surface condition delivered by agreement
cold-drawn
+C
— X
— -
X
after-drawn
+LC
— X
— X
X
peeledElements
+PE
X
X
X
2. Chemical composition
Table 3 – Steel grades and chemical composition. Cast analysis, mass fraction %
Steel grade
C
Si max.ǎ
Mn
P max
S
Cr
Mo
Ni
B
Cu max.
Abbreviated name
Material number
18MnB4 22MnB4
1.5521 1.5522
0.16 to 0.20 0.20 to 0.24
0,30 0,30
0.90 to 1.20 0.90 to 1.20
0,025 0,025
0.025 max 0.025 max
0.0008 to 0.005 0.0008 to 0.005
0,25 0,25
a A lower silicon content or a specified silicon range may be agreed upon at the time of order. NOTE 1 Elements not listed in this table should not be intentionally added to the steel, except for final refining of the melt, without the buyer’s consent. All reasonable precautions shall be taken to prevent the introduction of such elements from scrap and other materials used in production that could adversely affect hardenability, mechanical properties, and service performance. NOTE 2 For steels with hardenability requirements (see Tables 8 and 9), smaller deviations from the specified limits are permissible (with the exception of sulfur and phosphorus), provided that they do not exceed the values given in Table 4 for carbon 0,01 %and for the other elements. NOTE 3 To improve the results of cold heading, it is possible to add 0,020 %to 0.050 %aluminum.
Table 4 – Permissible limit deviations for the applicable limits of workpiece analysis and melt analysis in Table 3
Elements
Limit values according to melt analysis, mass fraction in %
Limits for product analysis, mass fraction in %a
C
≤0,24
±0.02
Si
≤0,30
±0,03
Mn
≤1,00
±0,04
>1,00 ≤1,40
±0,06
P
≤0,025
+0,005
S
≤0,040
+0,005
Cr
≤1,70
±0,05
Mo
≤0.30
±0.0.3
>0.30 ≤0,50
±0,04
Ni
≤1,00
±0,03
>1,00 ≤1,70
±0,05
B
≤0,005(
±0,0003
Cu
≤0.25
+0.03
a ± means that, for a given melt, either the upper or the lower limit of the range specified for melt analysis in Table 3 may be exceeded, but not both simultaneously. b For steels with a defined sulfur range (0,020 %to 0,040 %according to melt analysis), the tolerance is ±0.005 %.
3. Mechanical properties
Table 6 - Mechanical properties of boron alloy steels
Steel grade
Diameter
Delivery condition
+U
+AC or+AC+PE
+U+C
+U+C+AC
+U+C+AC+LC
+AC+C
Short name
Material Grade Number
Over mm
bis mm
Mechanical Properties
Rm max. MPa
Za min %
Rm max. MPa
Z min. %
Rm max. MPa
Z min %
Rm max. MPa
Z min %
Rm max. MPa
Z min %
Rm max. MPa
Z min. %
18MnB4
1.5521
2
5
500
64
540
62
5
10
580
55
500
64
680
53
480
64
520
62
600
59
10
40
580
55
500
64
670
53
480
64
520
62
590
59
a The values are provided for informational purposes only.
4. Hardenability requirements
Table 8 – Hardness limits for steel grades with normal hardenability requirements (H grade, see 6.4.1)
Steel grade
Symbol
Austenitizing temperature °C ±5℃
Range limit
Hardness HRC at a distance from the quenched end face, mm
Abbreviated name
Material number
1,5
3
5
7
9
11
13
15
20
25
30
35
40
18MnB4
1.5521
+H
890
max.
46
45
44
41
39
35
32
28
21
min
40
38
37
30
21
min
41
40
39
36
33
30
28
26
23
21
TECHNICAL NOTE
Application and ordering note
Chemical composition, mechanical properties, tolerances and delivery condition must be confirmed against the applicable standard edition, customer drawing and order specification.
