COLD FORMING MATERIALS

25CrMo4 CHQ wire

MATERIALSENGINEERINGCREATION GROUP

Products / ISO Standards / ISO 4954-Annex C

25CrMo4 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

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.2 —Chemical composition (applicable to cast analysis)of steel without boron for quenching and tempering

Steel name b	% mass fraction a
Steel name b	C c	Si d	Mn	P	S	Cr	Ni	Mo	Cu
C30EC	0,27 to 0,33	0,30	0,50 to 0,80	0,025	0,025		—	——	0,25
C30RC	0,27 to 0,33	0,30	0,50 to 0,80	0,025	0,020 to 0,035	—		—	0,25
C35EC	0,32 to 0,39	0,30	0,50 to 0,80	0,025	0,025		—	—	0,25
C35RC	0,32 to 0,39	0,30	0,50 to 0,80	0,025	0,020 to 0,035				0,25
C45EC	0,42 to 0,50	0,30	0,50 to 0,80	0,025	0.025	——	—	—	0,25
C45RC	0,42 to 0,50	0,30	0,50 to 0,80	0,025	0,020 to 0,035	——	一	—	0,25
37Mo2	0,35 to 0,40	0,30	0,60 to 0,90	0,025	0,025		—	0,20 to 0,30	0,25
38Cr2	0,35 to 0,42	0,30	0,50 to 0,80	0,025	0,025	0,40 to 0,60	—	—	0,25
46Cr2	0,42 to 0,50	0,30	0,50 to 0,80	0.025	0.025	0,40 to 0,60	—	—	0,25
34Cr4	0,30 to 0,37	0,30	0,60 to 0,90	0,025	0,025	0,90 to 1,20	—	—	0,25
37Cr4	0,34 to 0,41	0,30	0,60 to 0,90	0,025	0,025	0,90 to 1,20	—	—	0,25
41Cr4	0,38 to 0,45	0,30	0,60 to 0,90	0,025	0,025	0,90 to 1,20	一	—	0,25
41CrS4	0,38 to 0,45	0,30	0,60 to 0,90	0,025	0,020 to 0,040	0,90 to 1,20	—	—	0,25
25CrMo4	0,22 to 0,29	0,30	0,60 to 0,90	0,025	0,025	0,90 to 1,20	—	0,15 to 0,30	0,25
25CrMoS4	0,22 to 0,29	0,30	0,60 to 0,90	0,025	0,020 to 0,040	0,90 to 1,20	一	0,15 to 0,30	0,25
34CrMo4	0,30 to 0,37	0,30	0,60 to 0,90	0,025	0,025	0,90 to 1,20	—	0,15 to 0,30	0,25
37CrMo4	0,35 to 0,40	0,30	0,60 to 0,90	0,025	0,025	0,90 to 1,20	—	0,15 to 0,30	0,25
42CrMo4	0,38 to 0,45	0,30	0,60 to 0,90	0,025	0,025	0,90 to 1,20	—	0,15 to 0,30	0,25
42CrMoS4	0,38 to 0,45	0,30	0,60 to 0,90	0,025	0,020 to 0,040	0,90 to 1,20	—	0,15 to 0,30	0,25
41CrNiMo2	0,37 to 0,44	0,30	0,70 to 1,00	0,025	0,025	0,40 to 0,60	0,40 to 0,70	0,15 to 0,30	0,25
41CrNiMoS2	0,37 to 0,44	0,30	0,70 to 1,00	0,025	0,020 to 0,040	0,40 to 0,60	0,40 to 0,70	0,15 to 0,30	0,25
34CrNiMo6	0,30 to 0,38	0,30	0,50 to 0,80	0,025	0,025	1,30 to 1,70	1,30 to 1,70	0,15 to 0,30	0,25
41NiCrMo7-3-2	0,38 to 0,44	0,30	0,60 to 0,90	0,025	0,025	0,70 to 0,90	1,65 to 2,00	0,15 to 0,30	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 C.Z and C.9),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 carbon range of0,04%(e.g.0,33 %to 0,37 %)may be agreed at the time of enquiry and order D 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.

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.5 —Mechanical properties for alloy steel grades without boron

Steel name	Diameter		Delivery condition
	Diameter		+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. %
37Mo2	2	5			560	61	600	59
37Mo2	5	40	570	59	550	61	590	59
38Cr2	2	5			590	62	630	60
38Cr2	5	40	600	60	580	62	620	60
46Cr2	2	5			610	60	650	58
46Cr2	5	40	620	58	600	60	640	58
34Cr4	2	5	—	—	570	64	610	62
34Cr4	5	40	580	62	560	64	600	62
37Cr4	2	5			580	62	620	60
37Cr4	5	40	590	60	570	62	610	60
41Cr4 41CrS4	2	5	—	—	610	60	650	58
41Cr4 41CrS4	5	40	620	58	600	60	640	58
25CrMo4 25CrMoS4	2	5			570	62	610	60
25CrMo4 25CrMoS4	5	40	580	60	560	62	600	60
34CrMo4	2	5	—	—	590	62	630	60
34CrMo4	5	40	600	60	580	62	620	60
37CrMo4	2	5			610	62	650	60
37CrMo4	5	40	620	60	600	62	640	60
42CrMo4 42CrMoS4	2	5			620	60	660	58
42CrMo4 42CrMoS4	5	40	630	58	610	60	650	58
41CrNiMo2 41CrNiMoS2	2	5	—	—	640	60	680	55
41CrNiMo2 41CrNiMoS2	5	40	——	——	640	60	680	55
34CrNiMo6	2	5	——	——	710	60	750	58
34CrNiMo6	5	40	720	58	700	60	740	58
41NiCrMo7-3-2	2	5	—	—	710	60	750	58
41NiCrMo7-3-2	5	40	720	58	700	60	740	58

4.Hardenability Requirements

Table C.7—Hardness limits for steel grades without boron with specified (normal)hardenability (+H grades)

Table C.9 —Hardness limits for steel grades without boron with restricted hardenability scatter bands (+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
Steel name	Symbol	Austenitizing temperature °℃±5℃	Limits of range	1,5	3	5	7	9	11	13	15	20	25	30	35	40	45	50
37Mo2	+HH	850	max.	59	57	53	47	41	36	32	29	27	25	—	—	—	—	—
	+HH		min.	54	51	45	38	32	29	25	23	—	—	—	—	—	—	—
	+HL		max.	56	54	49	42	36	33	29	26	—	一	—	—		—
	+HL		min.	51	48	41	33	27	26	22	20	一		—	—	—	—
38Cr2	+HH	850	max.	59	57	54	49	43	39	37	35	32	30	27	25	24	23	22
	+HH		min.	54	50	43	36	31	28	26	24	21						—
	+HL		max.	56	53	48	42	37	33	31	29	26	24	21	—		—	—
	+HL		min.	51	46	37	29	25	22	20	—	—		—			—
46Cr2	+HH	850	max.	61	59	56	51	46	41	39		33	31	29	27	26	25	24
	+HH		min.	55	51	45	38	33	30	28	26	22	20		—			—
	+HL		max.	56	55	50	44	39	35	33	31	27	25	23	21	20
	+HL		min.	52	47	39	31	27	24	22		—			—			—
34Cr4	+HH	850	max	57	57	56	54	52	49	46	44	39	37	35	34	33	32	31
	+HH		min.	52	51	49	45	41	38	35	33	28	m	25	24	23	22	21
	+HL		max	54	54	52	50	46	43	40	38	34	32	30	29	28	27	26
	+HL		min.	49	48	45	41	35	32	29	27	23	21	20
37Cr4	+HH	850	max.	59	59	58	57	55	52	50	48	42	39	37	36	35	34	33
	+HH		min.	54	53	51	48	44	41	39	37	31	29	27	25	24	23	22
	+HL		max.	56	56	55	53	50	47	44	42	37	34	32	31	30	29	28
	+HL		min.	51	50	48	44	39	36	33	31	26	24	22	20	—	—
41Cr4 41CrS4	+HH	850	max.	61	61	60	59	58	56	54	52	46	42	40	38	37	36	35
	+HH		min.	56	55	53	51	47	43	41	39	35	31	29	27	26	25	24
	+HL		max	58	58	57	55	52	50	47	45	40	37	34	32	31	30	29
	+HL		min.	53	52	50	47	41	37	34	32	29	26	23	21		——	——
This table is not applicable to steels ordered with a restricted range of carbon content,see footnote c)in Table C.2.

Steel name	Symbol	Austenitizing temperature ℃±5℃	Limits of range	Hardness HRC at a distance from quenched end of test piece(in mm) of
Steel name	Symbol	Austenitizing temperature ℃±5℃	Limits of range	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
	+HH		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
	+HL		min.	44	43	40	37	34	32	29	27	23	21	20	—	—
34CrMo4	+HH	850	max.	57	57	57	56	55	54	53	52	48	45	43	41	40	40	39
	+HH		min.	52	52	51	49	46	44	42	40	36	34	32	31	30	29	29
	+HL		max.	54	54	54	52	51	49	47	46	42	39	38	36	35	35	34
	+HL		min.	49	49	48	45	42	39	36	34	30	28	27	26	25	24	24
37CrMo4	+HH	850	max.	60	60	60	59	58	56	55	54	51	48	46	45	一
	+HH		min.	55	53	53	51	49	47	45	45	40	39	36	36			—
	+HL		max.	57	57	56	55	54	52	50	46	44	41	41	39		一
	+HL		min.	52	50	50	47	45	43	40	37	34	32	31	30	—		——
42CrMo4 42CrMoS4	+HH	850	max	61	61	61	60	60	59	59	58	56	53	51	48	47	46	45
	+HH		min.	56	56	55	54	52	48	46	44	41	39	38	36	36	35	34
	+HL		max.	58	58	58	57	56	54	53	51	49	46	44	42	41	40	40
	+HL		min.	53	53	52	51	49	43	40	37	34	32	31	30	30	29	29
41CrNiMo2 41CrNiMoS2	+HH	850	max	60	60	60	59	58	57	55	54	48	42	40	38	37	37	36
	+HH		min.	55	55	55	53	51	47	44	41	36	33	31	29	28	28	27
	+HL		max.	58	58	57	56	54	52	49	48	42	37	35	34	33	33	32
	+HL		min.	53	53	52	50	47	42	38	35	30	28	26	25	24	24	23
34CrNiMo6	+HH	850	max.	58	58	58	58	57	57	57	57	57	57	57	57	57	57	57
	+HH		min.	53	53	53	53	52	51	51	51	51	50	50	50	50	49	48
	+HL		max.	55	55	55	55	54	54	54	54	54	54	54	54	53	53	53
	+HL		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 which at least 90 %martensite shall be attained in the core hardness test (+CH grades)

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
Steels without boron
37Mo2	+CH	850	48	8
38Cr2	+CH	850	48	8
46Cr2	+CH	850	51	9
34Cr4	+CH	850	46	14
37Cr4	+CH	850	48	15
41Cr4	+CH	850	50	16
41CrS4	+CH	850	50	16
25CrMo4	+CH	850	41	13
25CrMoS4	+CH	850	41	13
34CrMo4	+CH	850	45	18
37CrMo4	+CH	850	48	18
42CrMo4	+CH	850	50	21
42CrMoS4	+CH	850	50	21
34CrNiMo6	+CH	850	46	31
41NiCrMo 7-3-2	+CH	850	50	34
Boron-alloyed steel grades
17B2	+CH	900	37	9
23B2	+CH	890	40	9
28B2	+CH	880	43	10
33B2	+CH	870	45	11
38B2	+CH	860	48	11
23MnB3	+CH	880	42	14
17MnB4	+CH	890	37	12
20MnB4	+CH	880	39	14
23MnB4	+CH	880	42	14
27MnB4	+CH	870	43	14
30MnB4	+CH	860	44	14
36MnB4	+CH	850	47	14
37MnB5	+CH	850	48	16
30MoB1	+CH	870	45	18
32CrB4	+CH	860	46	30
36CrB4	+CH	850	48	30
31CrMoB2-1	+CH	860	45	30
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.