COLD FORMING MATERIALS

SMn438WCH Cold heading steel wire

MATERIALSENGINEERINGCREATION GROUP

Products / JIS Standard / JIS G3509

SMn438WCH Cold heading steel wire

Diameter of wire: 0.40-46mm

Tensile Strength: Please refer to the technical information page

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Shanghai Creation GroupIs China. It is a benchmark company that has 20 years of experience in an enterprise that focuses on cold heading quality steel wires in the entire management team. We have a good relationship with many tier one suppliers in the automotive industry and all the wire wire is supplied by brand steel mills. All orders are 100% traceable.

Technical delivery conditions

DA2 process: Extension line Dr-Burnt A-Extension line Dr:

DA3 process: Burned A-wire D-Burned A-wire Dr:

Surface Quality

- : Continuous, smooth

- : No stitches, no overlap, potholes, scratches, no extension marks

- : No rust

Applied Industry

- : Automotive Industry

- : Construction

- : Machinery & Equipment Industry

- : Other Industries

Case Study

Products & Service

Wire rod

Pickling and phosphating

Cold drawing

Spheroidizing annealing

Inspection

Finished products

1. Chemical composition

Table 1-Chemical ingredients, units %

Steel grade	C	Si	Mn	P	S	Ni	Cr	Mo
SMn420RCH	0.17 ~ 0.23	0.15 ~ 0.35	1.20 ~ 1.50	≤0.030	≤0.030	≤0.25	≤0.35	–
SMn420HRCH	0.16 ~ 0.23	0.15 ~ 0.35	1.15 ~ 1.55	≤0.030	≤0.030	≤0.25	≤0.35	–
SMn433RCH	0.30 ~ 0.36	0.15 ~ 0.35	1.20 ~ 1.50	≤0.030	≤0.030	≤0.25	≤0.35	–
SMn433HRCH	0.29 ~ 0.36	0.15 ~ 0.35	1.15 ~ 1.55	≤0.030	≤0.030	≤0.25	≤0.35	–
SMn438RCH	0.35 ~ 0.41	0.15 ~ 0.35	1.35 ~ 1.65	≤0.030	≤0.030	≤0.25	≤0.35	–
SMn438HRCH	0.34 ~ 0.41	0.15 ~ 0.35	1.30 ~ 1.70	≤0.030	≤0.030	≤0.25	≤0.35	–
SMn443RCH	0.40 ~ 0.46	0.15 ~ 0.35	1.35 ~ 1.65	≤0.030	≤0.030	≤0.25	≤0.35	–
SMn443HRCH	0.39 ~ 0.46	0.15 ~ 0.35	1.30 ~ 1.70	≤0.030	≤0.030	≤0.25	≤0.35	–
SMnC420RCH	0.17 ~ 0.23	0.15 ~ 0.35	1.20 ~ 1.50	≤0.030	≤0.030	≤0.25	0.35 ~ 0.70	–
SMnC433RCH	0.40 ~ 0.46	0.15 ~ 0.35	1.35 ~ 1.65	≤0.030	≤0.030	≤0.25	0.35 ~ 0.70	–
SCr415RCH	0.13 ~ 0.18	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	–
SCr415HRCH	0.12 ~ 0.18	0.15 ~ 0.35	0.55 ~ 0.95	≤0.030	≤0.030	≤0.25	0.85 ~ 1.25	–
SCr420RCH	0.18 ~ 0.23	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	–
SCr420HRCH	0.17 ~ 0.23	0.15 ~ 0.35	0.55 ~ 0.95	≤0.030	≤0.030	≤0.25	0.85 ~ 1.25	–
SCr430RCH	0.28 ~ 0.33	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	–
SCr430HRCH	0.27 ~ 0.34	0.15 ~ 0.35	0.55 ~ 0.95	≤0.030	≤0.030	≤0.25	0.85 ~ 1.25	–
SCr435RCH	0.33 ~ 0.38	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	–
SCr435HRCH	0.32 ~ 0.39	0.15 ~ 0.35	0.55 ~ 0.95	≤0.030	≤0.030	≤0.25	0.85 ~ 1.25	–
SCr440RCH	0.38 ~ 0.43	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	–
SCr440HRCH	0.37 ~ 0.44	0.15 ~ 0.35	0.55 ~ 0.95	≤0.030	≤0.030	≤0.25	0.85 ~ 1.25	–
SCM415RCH	0.13 ~ 0.18	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.25
SCM415HRCH	0.12 ~ 0.18	0.15 ~ 0.35	0.55 ~ 0.95	≤0.030	≤0.030	≤0.25	0.85 ~ 1.25	0.15 ~ 0.30
SCM418RCH	0.16 ~ 0.21	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.25
SCM418HRCH	0.15 ~ 0.21	0.15 ~ 0.35	0.55 ~ 0.95	≤0.030	≤0.030	≤0.25	0.85 ~ 1.25	0.15 ~ 0.30
SCM420RCH	0.18 ~ 0.23	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.25
SCM420HRCH	0.17 ~ 0.23	0.15 ~ 0.35	0.55 ~ 0.95	≤0.030	≤0.030	≤0.25	0.85 ~ 1.25	0.15 ~ 0.30
SCM425RCH	0.23 ~ 0.28	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.30
SCM425HRCH	0.23 ~ 0.28	0.15 ~ 0.35	0.55 ~ 0.95	≤0.030	≤0.030	≤0.25	0.85 ~ 1.25	0.15 ~ 0.30
SCM430RCH	0.28 ~ 0.33	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.30
SCM435RCH	0.33 ~ 0.38	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.30
SCM435HRCH	0.32 ~ 0.39	0.15 ~ 0.35	0.55 ~ 0.95	≤0.030	≤0.030	≤0.25	0.85 ~ 1.25	0.15 ~ 0.35
SCM440RCH	0.38 ~ 0.43	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.30
SCM440HRCH	0.37 ~ 0.44	0.15 ~ 0.35	0.55 ~ 0.95	≤0.030	≤0.030	≤0.25	0.85 ~ 1.25	0.15 ~ 0.35
SCM445RCH	0.43 ~ 0.48	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.15 ~ 0.30
SCM445HRCH	0.42 ~ 0.49	0.15 ~ 0.35	0.55 ~ 0.95	≤0.030	≤0.030	≤0.25	0.85 ~ 1.25	0.15 ~ 0.35
SCM822RCH	0.20 ~ 0.25	0.15 ~ 0.35	0.60 ~ 0.90	≤0.030	≤0.030	≤0.25	0.90 ~ 1.20	0.35 ~ 0.45
SCM822HRCH	0.19 ~ 0.25	0.15 ~ 0.35	0.55 ~ 0.95	≤0.030	≤0.030	≤0.25	0.85 ~ 1.25	0.35 ~ 0.45
SNC415RCH	0.12 ~ 0.18	0.15 ~ 0.35	0.35 ~ 0.65	≤0.030	≤0.030	2.00 ~ 2.50	0.20 ~ 0.50	–
SNC415HRCH	0.11 ~ 0.18	0.15 ~ 0.35	0.30 ~ 0.70	≤0.030	≤0.030	1.95 ~ 2.50	0.20 ~ 0.55	–
SNC631RCH	0.27 ~ 0.35	0.15 ~ 0.35	0.35 ~ 0.65	≤0.030	≤0.030	2.50 ~ 3.00	0.60 ~ 1.00	–
SNC631HRCH	0.26 ~ 0.35	0.15 ~ 0.35	0.30 ~ 0.70	≤0.030	≤0.030	2.45 ~ 3.00	0.55 ~ 1.05	–
SNC815CH	0.12 ~ 0.18	0.15 ~ 0.35	0.35 ~ 0.65	≤0.030	≤0.030	3.00 ~ 3.50	0.60 ~ 1.00	–
SNC815HRCH	0.11 ~ 0.18	0.15 ~ 0.35	0.30 ~ 0.70	≤0.030	≤0.030	2.95 ~ 3.50	0.55 ~ 1.05	–

All steel types in this table should not exceed 0.30% of Cu as an impurity.
By agreement between the receiving parties, Al may be added for grain granulation.
The undefined elements in this table must not be intentionally added except for the purpose of finishing the molten steel, unless there is an agreement between the receiving parties.
The allowable fluctuation value for the molten steel analysis regulation value of this table when the product analysis of steel is carried out according to the agreement between the receiving parties is in accordance with Table 4 of JIS G 0321.
Note a) The lower limit value of Si may be set to a value of less than 0.15% by agreement between the receiving parties.

2. Mechanical properties of the wire

Table 2 Mechanical Properties of Lines

Steel grade	Tensile strength （N／mm2）			Reduction of area （％）
	DA1	DA2	DA3	DA1	DA2	DA3
SMn420WCH	≤630	≤600	-	≥53	≥53	-
SMn433WCH	≤630	≤600	-	≥53	≥53	-
SMn438WCH	≤630	≤600	≤600	≥53	≥53	≥60
SMn443WCH	≤700	≤640	≤600	≥53	≥53	≥60
SMnC420WCH	-	-	-	-	-	-
SMnC443WCH	-	-	-	-	-	-
SCr415WCH	≤630	≤570	≤520	≥55	≥60	≥60
SCr420WCH	≤640	≤580	≤540	≥55	≥60	≥60
SCr430WCH	≤670	-	≤590	≥55	-	≥60
SCr435WCH	≤670	-	≤590	≥55	-	≥60
SCr440WCH	≤680	-	≤600	≥55	-	≥60

SCM415WCH	≤630	≤570	≤520	≥55	≥60	≥60
SCM418WCH	≤640	≤580	≤540	≥55	≥60	≥60
SCM420WCH	≤640	≤580	≤540	≥55	≥60	≥60
SCM425WCH	≤650	≤600	≤550	≥55	≥60	≥60
SCM430WCH	≤670	-	≤590	≥55	-	≥60
SCM435WCH	≤680	-	≤620	≥55	-	≥60
SCM440WCH	≤700	-	≤640	≥55	-	≥60
SCM445WCH	≤700	-	≤640	≥55	-	≥60
SCM882WCH	≤650	-	≤610	≥60	-	≥60

SNC415WCH	≤620	-	≤590	≥60	-	≥60
SNC631WCH	≤650	-	≤620	≥60	-	≥60
SNC815WCH	≤620	-	≤590	≥60	-	≥60
SNCM220WCH	≤650	-	≤600	≥55	-	≥60
SNCM240WCH	≤680	-	≤640	≥55	-	≥60
SNCM420WCH	≤700	-	≤680	≥55	-	≥60
SNCM439WCH	≤700	-	≤670	≥55	-	≥60
SNCM447WCH	≤700	-	≤670	≥55	-	≥60
SNCM616WCH	≤620	-	≤590	≥55	-	≥60

3. Depth of decalination

Table 3 Average decalination depth allowable limits

Unit mm
Diameter	Depth of ferrite decarburization	Total depth of decarburization
≤15	≤0.02	≤0.12
>15~25	≤0.02	≤0.15
>25~32	≤0.02	≤0.20
>32~40	≤0.03	≤0.25
>40~50	≤0.03	≤0.30

The wire having a diameter of more than 50 mm is subject to the agreement between the receiving parties.

4. Inchance

Table 5 Distance and hardness from the firing end

Steel grade	Distance from the quenched end mm																Heat-treatment temperature ℃
Steel grade	Hardness HRC	1.5	3	5	7	9	11	13	15	20	25	30	35	40	45	50	Normalizing	Quenching
SMn420HRCH	Upper limit / Lower limit	4840	4636	42 21	36 –	30–	27 –	25 –	24 –	21 –	– –	– –	– –	––	––	–	925	925
SMn433HRCH	Upper limit / Lower limit	5750	5646	53 34	49 26	4223	36 20	33 –	30 –	27 –	25 –	24 –	23 –	22–	21–	21 –	900	870
SMn438HRCH	Upper limit / Lower limit	5952	5949	5743	54 34	5128	46 24	41 22	39 21	35 –	33 –	31 –	30 –	29–	28–	27 –	870	845
SMn443HRCH	Upper limit / Lower limit	6255	6153	6049	59 39	5733	54 29	50 27	45 26	3723	34 22	3220	31 –	30–	29–	28 –	870	845
SCr415HRCH	Upper limit / Lower limit	4639	4534	41 26	35 21	31–	28 –	27 –	26 –	23 –	20 –	– –	– –	––	––	– –	925	925
SCr420HRCH	Upper limit / Lower limit	4840	4837	46 32	40 28	3625	34 22	32 21	31 –	29 –	27 –	26 –	24 –	23–	23–	22 –	925	925
SCr430HRCH	Upper limit / Lower limit	5649	5546	5342	51 37	4833	45 30	42 28	39 26	3521	33 –	31 –	30 –	28–	26–	25 –	900	870
SCr435HRCH	Upper limit / Lower limit	5851	5749	5646	55 42	5337	51 32	47 29	44 27	3923	37 21	35 –	34 –	33–	32–	31 –	870	845
SCr440HRCH	Upper limit / Lower limit	6053	6052	59 50	58 48	5745	55 41	54 37	52 34	4629	41 26	3924	37 22	37–	36–	35 –	870	845
SCM415HRCH	Upper limit / Lower limit	4639	4536	42 29	38 24	3421	31 20	29 –	28 –	26 –	25 –	24 –	24 –	23–	23–	22 –	925	925
SCM418HRCH	Upper limit / Lower limit	4739	4737	45 31	41 27	3824	35 22	33 21	32 20	30 –	28 –	27–	27 –	26–	26–	25 –	925	925
SCM420HRCH	Upper limit / Lower limit	4840	4839	47 35	44 31	4228	39 25	37 24	35 23	3320	31 20	30 –	30 –	29–	29–	28 –	925	925
SCM425HRCH	Upper limit / Lower limit	5244	5243	5140	50 37	4834	46 32	43 29	41 27	3723	35 21	3320	32 –	31–	31–	31 –	900	870
SCM435HRCH	Upper limit / Lower limit	5851	5850	5749	56 47	5545	54 42	53 39	51 37	4832	45 30	4328	41 27	3927	3826	37 26	870	845
SCM440HRCH	Upper limit / Lower limit	6053	6053	60 52	59 51	5850	58 48	57 46	56 43	5538	53 35	5133	49 33	4732	4631	44 30	870	845
SCM445HRCH	Upper limit / Lower limit	6356	6355	62 55	62 54	6153	61 52	61 52	60 51	5947	58 43	5739	56 37	5535	5535	54 34	870	845
SCM822HRCH	Upper limitLower limit	5043	5042	5041	49 39	4836	46 32	43 29	41 27	3924	38 24	3723	36 22	3622	3621	36 21	925	925
SNC415HRCH	Upper limit / Lower limit	4537	4432	39 24	35 –	31–	28 –	26 –	24 –	21 –	– –	– –	– –	––	––	– –	925	925
SNC631HRCH	Upper limit / Lower limit	5749	5748	5647	56 46	5545	55 43	55 41	54 39	5335	51 31	4929	47 28	4527	4426	43 26	900	870
SNC815HRCH	Upper limit / Lower limit	4638	4637	46 36	46 34	4531	44 29	43 27	41 26	3824	35 22	3422	34 22	3321	3321	32 21	925	845
SNCM220HRCH	Upper limit / Lower limit	4841	4737	44 30	40 25	3522	32 20	30 –	29 –	26 –	24 –	23 –	23 –	23–	22–	22 –	925	925
SNCM420HRCH	Upper limit / Lower limit	4841	4738	46 34	42 30	3927	36 25	34 23	32 22	29 –	26 –	25 –	24 –	24–	24–	24 –	925	925

5. Allowance of wire diameter and differential deviation

Table 8 Allowance of Wire Diameter and Difference Difference

Diameter	Tolerance	Out-of-roundness
≤15	±0.30	≤0.40
>15~25	±0.40	≤0.50
>25~32	±0.50	≤0.60
>32~50	±0.60	≤0.70

Note 1) The deviation difference refers to the difference between the maximum value and the minimum value of the diameter of the wire in the same cross section. For a wire having a diameter of more than 50mm, it is in accordance with the agreement between the receiving parties.

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