Technical data for 31CrMoB2-1 cold-heading steel wire, with a specification standard of ISO 4954. View the current grade’s chemical composition, mechanical properties, and related technical requirements.
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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.
Steel name b
% mass fraction a
C
SI c
Mn
P
S
Cr d
Mo
B
Cu
31CrMoB2-1
0,28 to 0,33
0,30
0,90 to 1,20
0,025
0,025
0,40 to 0,55
0,10 to 0,15
0,0008 to 0,005
0,25
3. Mechanical properties
Table C.6 Mechanical properties of boron-alloyed steel grades
Steel name
Diameter
Delivery condition
+AR or +PE
+AC or +AC+PE
+AR+C
+AR+C+AC
+AR+C+AC+LC
+AC+C
above mm
up to mm
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. %
Rm max. MPa
Z min. %
31CrMoB2-1
2
5
—
——
570
63
610
61
——
—
5
40
—
—
570
61
—
550
63
590
61
690
56
It should be recognized in the +AR condition that the tensile strength values are not compatible with the entire range of composition given in T able C. 3 for a steel grade. Care should be taken that, depending on diameter and composition supplied, the tensile strength values are compatible with the hardenability requirements.
4. Hardenability requirements
Table C.8 Hardness limits for boron-alloyed steel grades with standard hardenability (H grade)
Table C.10 Maximum diameter for achieving at least 90% martensite in core hardness testing (+CH grade)
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.
