COLD FORMING MATERIALS

28B2 CHQ wire

MATERIALSENGINEERINGCREATION GROUP

Products / ISO Standards / ISO 4954-Annex C

28B2 CHQ wire

Diameter: 0.40-46mm

Tensile strength: Refer to technical information

Product Detail Technical Information Inspection Packaging

Shanghai Creation Group is a benchmark enterprise who focus on cold heading quality steel wire in China.The whole management team has 20 years of experience in the industry.We build good relationships with many tier 1 suppliers to the automotive industry, all wire rod is sourced from branded steel mills. All orders are 100% traceable.

Delivery condition

: +AC or +AC+PE

: +AR+C

: +AR+C+AC

: +AR+C+AC+LC

: +AC+C

Surface quality

- : Continuous and smooth

- : Free of seams, overlaps, pits, scratches and drawing scars

- : Free of rust

Application

- : Automobile industry

- : Construction industry

- : Machinery industry

- : Other Industries

Case Study

Products & Service

Wire rod

Pickling and phosphating

Cold drawing

Spheroidizing annealing

Inspection

Finished product

1.Combination of delivery terms

Table C.1 —Combinations of heat-treatment conditions at delivery,product forms and applicable requirements

Heat-treatment condition at delivery

Symbo

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

Tables C.2,C.3,C.4, C.5 or C.6

Tables C.2,C.3,C.4,C.5,C,6,C.Z C.8 or C.9

Tables C.2,C.3,C.4,C.5,C.6 or C.10

Optional

As hot-rolled or peeled

+AR or +PE

Chemical compo- sition as speci- fied in Tables C.2 and C.3

Me- chanical properties as spec- ified in Tables C.4. C.5 and C.6

Chemical compo- sition as speci- fied in Tables C.2 and C.3

Me- chanical properties as spec- ified in Tables C.4, C.5 and C.6

Values for harden- ability according to Tables C.Z C.8 and C.9

Chemical compo- sition as speci- fied in Tables C.2 and C.3

Me- chanical properties as spec- ified in Tables C.4. C.5 and C.6

Mini- mum core hardness and max- imum diameter accord- ing to TableC.10

Supplementa- ry or special requirements as specified in Annex Eb

Cold drawn

+AR +C

—

Cold drawn + spheroidized

+AR+C+ AC

—

Cold drawn + spheroidized + skin passed

+AR+C +AC +LC

—

Spheroidized or spheroidized + peeled

+AC or +AC+PE

Spheroidized + cold drawn

+AC+C

—

Spheroidized+ cold drawn +spheroidized

+AC+C+ AC

Spheroidized + cold drawn +sphe- roidized +skin passed

+AC+C+ AC+LC

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 C.3—Chemical composition (applicable to cast analysis)of boron-alloyed steel grades for quenching and tempering

Steel name b

% mass fraction

Si c

Cr d

17B2

0,15 to 0,20

0,30

0,60 to 0,90

0,025

0,30

0,0008 to 0,005

0,25

23B2

0,20 to 0,25

0,30

0,60 to 0,90

0,025

0,30

0,0008 to 0,005

0,25

28B2

0,25 to 0,30

0,30

0,60 to 0,90

0,025

0,30

——

0,0008 to 0,005

0,25

33B2

0,30 to 0,35

0,30

0,60 to 0,90

0,025

0,30

—

0,0008 to 0,005

0,25

38B2

0,35 to 0,40

0,30

0,60 to 0,90

0,025

0,30

—

0,0008 to 0,005

0,25

23MnB3

0,21 to 0,25

0,15

0,80 to 1,00

0,015

0,25 to 0,35

—

0,0008 to 0,005

0,25

17MnB4

0,15 to 0,20

0,30

0,90 to 1,20

0,025

0,30

—

0,0008 to 0,005

0,25

20MnB4

0,18 to 0,23

0,30

0,90 to 1,20

0,025

0,30

0,0008 to 0,005

0,25

23MnB4

0,20 to 0,25

0,30

0,90 to 1,20

0.025

0,025

0,30

—

0,0008 to 0,005

0,25

27MnB4

0,25 to 0,30

0,30

0,90 to 1,20

0,025

0,30

—

0,0008 to 0,005

0,25

30MnB4

0,27 to 0,32

0,30

0,80 to 1,10

0,025

0,30

—

0,0008 to 0,005

0,25

36MnB4

0,33 to 0,38

0,30

0,80 to 1,10

0,025

0,30

—

0,0008 to 0,005

0,25

20MnB5

0,17 to 0,23

0,30

1,10 to 1,40

0,025

0,30

—

0,0008 to 0,005

0,25

23MnB5

0,20 to 0,26

0,30

1,10 to 1,40

0,025

0,30

—

0,0008 to 0,005

0,25

26MnB5

0,23 to 0,29

0,30

1,20 to 1,50

0,025

0,30

—

0,0008 to 0,005

0,25

34MnB5

0,31 to 0,37

0,30

1,20 to 1,50

0,025

0,30

—

0,0008 to 0,005

0,25

37MnB5

0,35 to 0,40

0,30

1,15 to 1,45

0,025

0,30

—

0,0008 to 0,005

0,25

30MoB1

0,28 to 0,32

0,30

0,80 to 1,00

0,025

0,30e

0,08 to 0,12

0,0008 to 0,005

0,25

provided that they do not exceed 0,01 %for carbon and the values indicated in Table 2 for the other elements.

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
Steel name b	C	SI c	Mn	P	S	Cr d	Mo	B	Cu
32CrB4	0,30 to 0,34	0,30	0,60 to 0,90	0,025	0,025	0,90 to 1,20	—	0,0008 to 0,005	0,25
36CrB4	0,34 to 0,38	0,30	0,70 to 1,00	0,025	0.025	0,90 to 1,20		0,0008 to 0,005	0,25
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
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 Table C.8),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 Table2 for the other elements. 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.6 —Mechanical properties for 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
			Mechanical properties
	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. %
20MnB4	2	5				—			490	68	530	66		—
	5	10	580	60	500	66	680	55	480	68	520	66	600	61
	10	25	580	60	500	66	670	55	480	68	520	66	590	61
23MnB4	2	5							510	66	550	64	—
	5	10	600	60	520	64	700	55	500	66	540	64	620	59
	10	25	600	60	520	64	690	55	500	66	540	64	610	59
27MnB4	2	5					—	—	530	65	570	63
27MnB4	5	40	—		540	63		—	520	65	560	63	640	58
30MnB4	2	5	一	—			—		560	65	600	63	—	—
30MnB4	5	40	——	—	570	63		—	550	65	590	63	670	58
36MnB4	2	5	—	——	一		—	——	590	64	630	62		—
36MnB4	5	40	—	—	600	62	—	—	580	64	620	62	700	57
20MnB5	2	5						—			630	55	—
20MnB5	5	40		—		一	—	—	—		630	55	630	55
23MnB5	2	5	—	—	—	—	—	—	—	—	640	55		—
23MnB5	5	40	—		—	—		—	—	—	640	55	640	55
26MnB5	2	5	—		一	—		—		一	650	55	—	—
26MnB5	5	40	—			—	—	—			650	55	650	55
34MnB5	2	5	—	—	—	—	—		—	—	680	55	—	—
34MnB5	5	40	—	—	一		一	—		一	680	55	680	55
37MnB5	2	5						—	610	64	650	62		—
37MnB5	5	40	—		620	62	—	—	600	64	640	62	720	57
It should be recognized in the +AR condition that the tensile strength values are not compatible with the whole range of composition given in TableC.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.

Steel name	Diameter		Delivery condition
			+AR or +PE		+AC or +AC+PE		+AR+C		+AR+C+AC		+AR+C+AC+LC		+AC+C
			Mechanical properties
	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. %
30MoB1	2	5		—	——	—		—	530	64	570	62	—	—
30MoB1	5	40			530	62		一	510	64	550	62	630	57
32CrB4	2	5	—	—	—	一	—	—	550	64	590	62	—	—
32CrB4	5	40		—	550	62		—	530	64	570	62	670	57
36CrB4	2	5		—				—	570	63	610	61	—	—
36CrB4	5	40		—	570	61	—	—	550	63	590	61	690	56
31CrMoB2-1	2	5			—			——	570	63	610	61	——	—
31CrMoB2-1	5	40	一	—	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 whole range of composition given in TableC.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.