Technical data for 18MnB4 cold heading wire, in accordance with ISO 4954-Appendix B. View the chemical composition, mechanical properties, and related technical requirements for the current 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 B.1 - Combinations of heat treatment condition at delivery, product form, and applicable requirements
Heat-treatment condition at delivery
Symbol
Products form a
Applicable requirements in cases where the steel concerned has been ordered with reference to the steel names indicated in
Wire rod
Bar
Wire
T a b les B. 2,B.3,B.4 or B.5
Ta bles B. 2,B.3,B.4,B.5,B.6 or B,7
Optional
As hot-rolled or peeled
+AR or +PE
X
X
X
Chemical composition as specified in Table B.2
Mechanical properties as specified in Ta b les B.3, B.4 and B.5
Chemical compositior as specified in Table B.2
Mechanical properties as specified in Tables B.3, B.4 and B.5
Values for hardenability according to Ta b les B.6 and B.7
Supplementa- ry or special requirements as specified in Annex Eh
Cold drawn
+AR+C
-
X
X
Cold drawn + spheroidized
+AR+C+AC
-
X
X
Cold drawn + spheroidized+skin passed
+AR+C+AC +LC
-
X
X
Spheroidized or spheroidized+peeled
+AC or +AC +PE
X
X
X
Spheroidized+cold drawn
+AC+C
X
X
Treated to ferrite- pearlite structure and hardness range
+FP
-
X
-
Others
Other delivery conditions may be agreed at the time of ordering
a X=applicable,-=not applicable. b If agreed at the time of the enquiry and order.
2. Chemical composition
Table B.2 - Chemical composition of steels for surface hardening (applicable to cast analysis)
Steel name b
% mass fraction a
C
Si c
Mn
P
S
Cr
Ni
Mo
B
Cu
18MnB4
0,16 to 0,20
0,30
0,90 to 1,20
0,025
0,025
—
—
0,0008 to 0,005
0,25
Elements not quoted in this table should not be intentionally added to the steel without the agreement of the purchaser,except those intended for finishing the heat.All reasonable precautions shall be taken in order to prevent the addition of such elements from scrap or other materials used in the production process,which can affect the hardenability, mechanical properties and applicability To improve the performance of cold heading,it is possible to add Al:0,020 %to 0,050 % a Maximum values unless otherwise indicated. b In the case of steels with hardenability requirements (see Tables B.6 and B.Z),minor deviations from the specified limits are permitted (with the exception of sulfur and phosphorus),provided that they do not exceed 0,01 %for carbon and the values indicated in Table 2 for the other elements. c A lower silicon content or a specific silicon range may be agreed at the time of ordering
Table B.2 - Chemical composition of steels for surface hardening (applicable to cast analysis)
3. Mechanical properties
Table B.4 - Mechanical properties of boron-alloyed steel grades
Steel name
Diameter
Delivery condition
+AR
+AC or +AC+PE
+AR+C
+AR+C+AC
+AR+C+AC+LC
+AC+C
above mm
up to mm
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
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 reference only.
4. Hardenability requirements
Table B.6 - Hardness limits for standard hardenability steel grades (H class)
Steel name
Symbol
Austenitizing temperature ℃±5℃
Limits of range
Hardness HRC at a distance from quenched end of test piece(in mm)of
1,5
3
5
7
9
11
13
15
20
25
30
35
40
18MnB4
+H
890
max.
46
45
44
41
39
35
32
28
21
—
min.
40
38
37
30
21
—
—
—
Table B.6 - Hardness limits for standard hardenability steel grades (H class) (continued)
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.
