COLD FORMING MATERIALS

SWCHB320 Cold heading steel wire

MATERIALSENGINEERINGCREATION GROUP

Products / JIS Standard / JIS G3508

SWCHB320 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

DA process:

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 %

		Table 1 – Chemical composition
						Unit %
Steel grade	C	Si a）	Mn	P	S	B b）
SWRCHB223	0.20-0.26	0.10-0.35	0.60-0.90	≤0.030	≤0.030	≥0.0008
SWRCHB237	0.34-0.40	0.10-0.35	0.60-0.90	≤0.030	≤0.030	≥0.0008
SWRCHB320	0.17-0.23	0.10-0.35	0.70-1.00	≤0.030	≤0.030	≥0.0008
SWRCHB323	0.20-0.26	0.10-0.35	0.70-1.00	≤0.030	≤0.030	≥0.0008
SWRCHB331	0.28-0.34	0.10-0.35	0.70-1.00	≤0.030	≤0.030	≥0.0008
SWRCHB334	0.31-0.37	0.10-0.35	0.70-1.00	≤0.030	≤0.030	≥0.0008
SWRCHB420	0.17-0.23	0.10-0.35	0.80-1.10	≤0.030	≤0.030	≥0.0008
SWRCHB526	0.23-0.29	0.10-0.35	0.90-1.20	≤0.030	≤0.030	≥0.0008
SWRCHB620	0.17-0.23	0.10-0.35	1.10-1.40	≤0.030	≤0.030	≥0.0008
SWRCHB623	0.20-0.26	0.10-0.35	1.10-1.40	≤0.030	≤0.030	≥0.0008
SWRCHB726	0.23-0.29	0.10-0.35	1.20-1.50	≤0.030	≤0.030	≥0.0008
SWRCHB734	0.31-0.37	0.10-0.35	1.20-1.50	≤0.030	≤0.030	≥0.0008

All steel types in this table should not exceed 0.30% Cu, 0.20% Ni and 0.20% Cr. Note a) The lower limit value of Si may be set to a value of less than 0.10% by agreement between the receiving parties. b) The content of B may be 0.000 5% or more depending on the agreement between the receiving parties.

2. Inchance

Table 3 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
SWRCHB223	Upper limit / Lower limit	50 42	49 40	48 22	46 20	41 –	32 –	24 –	21 –	– –	– –	– –	– –	– –	– –	– –	900	875
SWRCHB237	Upper limit / Lower limit	58 50	58 47	57 37	55 26	52 21	46 –	38 –	32 –	26 –	24 –	23 –	21 –	– –	– –	– –	870	845
SWRCHB320	Upper limit / Lower limit	48 40	47 39	46 33	44 21	39 –	31 –	26 –	23 –	– –	– –	– –	– –	– –	– –	– –	925	925
SWRCHB323	Upper limit / Lower limit	50 42	49 41	48 34	46 20	42 –	33 –	27 –	23 –	– –	– –	– –	– –	– –	– –	– –	900	870
SWRCHB331	Upper limit / Lower limit	54 46	53 45	52 39	51 23	48 –	36 –	29 –	25 –	20 –	– –	– –	– –	– –	– –	– –	900	870
SWRCHB334	Upper limit / Lower limit	57 49	56 48	55 45	54 30	51 21	47 –	39 –	31 –	24 –	22 –	– –	– –	– –	– –	– –	870	845
SWRCHB420	Upper limit / Lower limit	48 40	48 38	47 32	45 22	41 –	35 –	30 –	27 –	22 –	– –	– –	– –	– –	– –	– –	925	925
SWRCHB526	Upper limit / Lower limit	52 44	52 43	51 40	50 28	48 21	45 –	41 –	33 –	23 –	– –	– –	– –	– –	– –	– –	900	870
SWRCHB620	Upper limit / Lower limit	48 40	48 39	48 37	47 30	46 22	44 –	40 –	36 –	29 –	25 –	21 –	– –	– –	– –	– –	925	925
SWRCHB623	Upper limit / Lower limit	50 42	50 41	49 39	48 35	48 27	46 20	44 –	41 –	30 –	22 –	– –	– –	– –	– –	– –	900	870
SWRCHB726	Upper limit / Lower limit	52 44	52 43	52 42	51 40	50 34	49 27	48 23	45 20	36 –	27 –	23 –	20 –	– –	– –	– –	900	870
SWRCHB734	Upper limit / Lower limit	57 49	56 48	56 47	55 45	55 43	54 37	53 31	51 26	43 20	33 –	28 –	25 –	22 –	20 –	– –	870	845

3. Mechanical properties of the wire

Table 4 Mechanical Properties of Lines by D Process

Mechanical properties of D-process wire rod
Steel grade	Tensile strength N/mm2	Reduction of area %	Hardness HRB
SWCHB 223	≤750	≥45	≤100
SWCHB 320
SWCHB 323
SWCHB 420
SWCHB 526
SWCHB 620

Remarks In the case of 1 wire diameter of 20 mm or more, the diaphragm is a value reduced by 5 from the value of Table 2. In addition, for 3 mm or less, the diaphragm is not specified. 2 N/mm2 = 1MPa

Table 5 Mechanical Properties of Lines by DA Process

Mechanical properties of DA-process wire rod
Steel grade	Tensile strength N/mm2	Reduction of area %	Hardness (Reference) HRB
SWCHB 223	≤610	≥55	≤93
SWCHB 237	≤670		≤96
SWCHB 320	≤600		≤92
SWCHB 323	≤610		≤93
SWCHB 331	≤630		≤94
SWCHB 334	≤650		≤95
SWCHB 420	≤600		≤92
SWCHB 526	≤650		≤95
SWCHB 620	≤630		≤94
SWCHB 623	≤640		≤95
SWCHB 726	≤650		≤95
SWCHB 734	≤680		≤97

Remarks In the case of 1 wire diameter of 20 mm or more, the diaphragm is a value reduced by 5 from the value of Table 2. In addition, for 3 mm or less, the diaphragm is not specified. 2 N/mm2 = 1MPa

4. De-coal formation deep

Table 6 Average decalination depth allowable limits

Average depth of decarburization
Wire diameter （mm）	Depth of ferrite decarburization	Total depth of decarburization
≤15	＜0.02	＜0.15
15＜d≤25	＜0.03	＜0.20
25＜d≤32	＜0.04	＜0.25

In the case of the line between the decarburying depth SWCH30K and SWCH50K and the designation of the orderer, the test of 10.3.1 is performed, and the allowable limit of the average decarburying depth is in accordance with Table 4. However, for a line having a diameter of more than 32mm, it is according to the agreement between the receiving parties.

5. Allowance of wire diameter and differential deviation

Table 7 Allowance of Wire Diameter and Difference Difference

Table 7 – Wire diameter tolerance and deviation
		Unit mm
Wire diameter	Tolerance	Out-of-roundness
≤3	0-0.025	0.013
3<d≤6	0-0.030	0.013
6<d≤10	0-0.036	0.013
10<d≤18	0-0.043	0.013
18<d≤30	0-0.070	0.013
30<d≤40	0-0.100	0.013
40<d≤50	0-0.150	0.013

Note (3) The deviation difference refers to the difference between the maximum value and the minimum value of the diameter in the same cross section of the line.

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