Technical data for 20MoCr4 cold heading wire, applicable standard ISO 4954-Annex B. View the chemical composition, mechanical properties, and related technical requirements of 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
20MoCr4
0,17 to 0,23
0,30
0,70 to 1,00
0,025
0,025
0,30 to 0,60
0,40 to 0,50
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.5 - Mechanical properties of alloy steel grades
Steel name
Diameter
Delivery condition
+AC
+FP
+AR+C+AC
+AR+C+AC+LC
+AC+C
above mm
up to mm
Rm max. MPa
Za min %
HB Min./max.
Rm max. MPa
Z min %
Rm max. MPa
Z min. %
Rm max. MPa
Z min. %
20MoCr4 20MoCrS4
2
5
—
—
560
62
600
60
—
5
10
560
60
140
187
540
62
580
60
670
57
10
40
560
60
140
187
540
62
580
60
660
57
Table B.5 - Mechanical properties of alloy steel grades (continued)
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
20MoCr4
+H
910
max.
49
47
44
41
38
35
33
31
28
26
25
24
24
Table B.6 - Hardness limits for standard hardenability steel grades (H class) (continued)
Table B.7 - Hardness limits for steel grades with restricted hardenability scatter bands (HH and HL classes)
Table B.7 – Hardness limits for the scatter band of steel grades with restricted hardenability (HH and HL grades) (continued)
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
20MoCr4 20MoCrS4
+HH
910
max.
49
47
44
41
38
35
33
31
28
26
25
24
24
min.
44
40
35
32
29
26
24
22
—
—
—
+HL
max.
46
44
40
36
33
31
29
27
24
22
21
20
20
min.
41
37
31
27
24
22
—
—
—
—
—
—
min.
44
43
42
40
38
36
34
32
29
27
26
25
24
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.
