Technical data for 25CrMoS4 cold heading wire, compliant with ISO 4954-Appendix C. 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 C.1 Combinations of delivery heat treatment conditions, product forms, and applicable requirements
2. Chemical composition
Table C.3 Chemical composition of boron-alloyed steel grades for quenching and tempering (applicable to cast analysis)
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 b
Maximum values unless otherwise indicated. In the case of steels with hardenability requirements (see Table C.8),minor deviations from the specified limits are permitted (with the exception of sulfur and phosphorus) c Lower silicon contents may be agreed at the time of ordering,in which case due consideration should be given to the effects that could result for what concerns the specified properties such as,for example,hardenability. d Where a maximum chromium content of 0,30 %is specified,a minimum level may also be agreed at the time of enquiry and order e In order to obtain a core hardening for the steel grade 30MoB1,the lower limit of Cr shall be 0,15 %and may be agreed at the time of enquiry and order.For certain applications, the higher limit for Cr may also be lowered by agreement at time of enquiry and order.
3. Mechanical properties
Table C.5 - Mechanical properties of boron-free alloy steel grades
Steel name
Diameter
Delivery condition
+AC or +AC+PE
+AC+C+AC
+AC+C+AC+LC
above mm
up to mm
Rm max. MPa
Z min %
Rm max. MPa
Z min. %
Rm max. MPa
Z min. %
25CrMo4 25CrMoS4
2
5
570
62
610
60
5
40
580
60
560
62
600
60
4. Hardenability requirements
Table C.7 - Hardness limits for boron-free steel grades with specified (normal) hardenability (H grade)
Steel name
symbol
Austenitizing temperature °℃±5℃
Limits of range
Hardness HRC at a distance from quenched end of test piece(in mm) of
1
2
3
4
5
6
7
8
9
10
11
13
15
20
25
30
25CrMoS4
min.
44
43
40
37
34
32
29
27
23
21
20
—
—
—
—
Table C.9 - Scatter bands of hardness limits for boron-free steel grades with restricted hardenability (HH and HL grades) a
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
45
50
25CrMo4 25CrMoS4
+HH
850
max.
52
52
51
50
48
46
43
41
37
35
33
32
31
31
31
min.
47
46
44
41
39
37
34
32
28
26
24
23
22
22
22
+HL
max.
49
49
47
46
43
41
38
36
32
30
29
28
27
27
27
min.
44
43
40
37
34
32
29
27
23
21
20
—
—
min.
53
53
53
53
52
51
51
51
51
50
50
50
50
49
48
min
50
50
50
50
49
48
48
48
48
47
47
47
46
45
44
This table is not applicable to steels ordered with a restricted range of carbon content,see footnote c)in Table C.2.
Table C.10 Maximum diameter for achieving at least 90% martensite in core hardness testing (+CH grade)
Steel name
Symbol
Austenitizing temperature in the core hardening testa C±5℃
Min.core hardness ( 90 %martensite structure) HRC
Maximum diameter to ensure 90 %of martensite in the coreb mm
25CrMoS4
+CH
850
41
13
a As a guideline,a hardening time at temperature of at least 30 min is recommended. The maximum diameters stated are those attainable with the lowest hardenability within each steel grade.Using +HH grades the maximum diameter can be increased.
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.
