COLD FORMING MATERIALS

ML20 cold heading wire rod

MATERIALSENGINEERINGCREATION GROUP

Products / GB National Standard / GB/T 5953.2

ML20 cold heading wire rod

Wire diameter: 0.40-46mm

Tensile Strength: Please refer to the technical parameters page

Product Detail Technical Information Inspection Packaging

Shanghai Creation GroupCo., Ltd. is a benchmark enterprise of domestic cold heading wire rod, with an average of more than 15 years of industry experience in production management. Most of its cooperative customers are first-class suppliers of global automobile enterprises, and all raw materials come from well-known domestic steel mills. All production orders are 100 per cent traceable.

Technical delivery conditions

: Cold drawing spheroidizing annealing light drawing (spheroidizing annealing light drawing)- SALD

: Annealing cold drawing spheroidizing annealing light drawing state (annealing spheroidizing annealing light drawing)- ASALD;

Surface quality

- : Continuous smooth wire surface

- : No seams, overlaps, pits, scratches and pull marks

- : No rust

Application Industry

- : Automotive industry

- : building materials industry

- : Machinery and equipment industry

- : Other Industries

Case Study

Products & Service

Wire rod

Pickling and phosphating

Cold drawing

Spheroidizing annealing

Check

Finished products

1. Chemical composition

Table 1-Chemical composition, mass fraction%

No.	统一数字代号	Steel grade	Chemical composition (mass fraction) /%
No.	统一数字代号	Steel grade	C	Si	Mn	P	S	Alta
1	U40048	ML04Al	≤0.06	≤0.10	0.20〜0.40	≤0.035	≤0.035	≥0.020
2	U40068	ML06Al	≤0.08	≤0.10	0.30〜0.60	≤0.035	≤0.035	≥0.020
3	U40088	ML08Al	0.05〜0.10	≤0.10	0.30〜0.60	≤0.035	≤0.035	≥0.020
4	U40108	ML10Al	0.08〜0.13	≤0.10	0.30〜0.60	≤0.035	≤0.035	≥0.020
5	U40102	ML10	0.08〜0.13	0.10〜0.30	0.30〜0.60	≤0.035	≤0.035	-
6	U40128	ML12Al	0.10〜0.15	≤0.10	0.30〜0.60	≤0.035	≤0.035	≥0.020
7	U40122	ML12	0.10〜0.15	0.10〜0.30	0.30〜0.60	≤0.035	≤0.035	-
8	U40158	ML15Al	0.13〜0.18	≤0.10	0.30〜0.60	≤0.035	≤0.035	≥0.020
9	U40152	ML15	0.13-0.18	0.10〜0.30	0.30〜0.60	≤0.035	≤0.035	-
10	U40208	ML20Al	0.18〜0.23	≤0.10	0.30〜0.60	≤0.035	≤0.035	≥0.020
11	U40202	ML20	0.18〜0.23	0.10〜0.30	0.30〜0.60	≤0.035	≤0.035	-
当测定酸溶铝AL时，Al≥0.015%。

When determining the acid soluble aluminum AL, Al ≥ 0.015%.

2. Mechanical properties

Table 2 Tensile strength, reduction of area and hardness of HD process steel wire

2.1 The tensile strength and area shrinkage of cold pier steel wire produced by HD process shall meet the requirements of Table 2.

Steel grade ^a	Nominal wire diameter d/ mm	Tensile strength Rm/ (N/mm²)	Reduction of area Z/ %	Rockwell hardness ^b/ HRB
ML04Al ML08Al ML10Al	≤3.00	≥460	≥50	一
	>3.00~4.00	≥360	≥50	一
	>4.00~5.00	≥330	≥50	一
	>5.00〜25. 00	≥280	≥50	<85
ML15Al ML15	≤3.00	≥590	≥50	一
	>3.00~4.00	≥490	≥50	一
	>4.00~5.00	≥420	≥50	一
	>5.00~25.00	≥400	≥50	<89
ML18MnAl ML20Al ML20 ML22MnAl	≤3.00	≥850	≥35	一
	>3.00〜4.00	≥690	≥40	—
	>4.00〜5.00	≥570	≥45	一
	>5.00〜25.00	≥480	≥45	<97
注：钢丝公称直径大于20 mm时，断面收缩率可以降低5%。
a For reference on the grade's chemical composition, see GB/T 6478。 b Hardness values are for reference only 。

Table 3 Tensile strength, reduction of area and hardness of SALD process steel wire

2.2 The tensile strength and area shrinkage of cold pier steel wire produced by SALD process shall meet the requirements of Table 3.

Steel grade ^a	Tensile strength Rm/ (N/mm²)	Reduction of area Z/ %	Rockwell hardness ^b HRB
ML04Al ML08Al ML10Al	300〜450	>70	<76
ML15Al ML15	340〜500	>65	<81
ML18Mn ML20Al ML20 ML22Mn	450〜570	>65	<90
注：钢丝公称直径大于20 mm时，断面收缩率可以降低5%。
a For reference on the grade's chemical composition, see GB/T 6478。 b Hardness values are for reference only 。

Note: When the nominal diameter of steel wire is greater than 20mm, the reduction of area can be reduced by 5%.
The chemical composition of a brand number can refer to GB/T 6478.
B Hardness values are for reference only.
The mechanical properties of 2.3 steel wire with nominal diameter greater than 25.00mm shall be determined by both parties through negotiation.
The mechanical properties of steel wires of grades not listed in the 2.4 table shall be determined by both parties through negotiation.
2.5 upsetting
for cold pier steel wire produced by HD process, no crack or crack shall occur 1/2 the steel wire sample is cooled to the original height of the sample. For cold pier steel wire produced by SALD process, no crack or crack shall occur 1/3 the steel wire sample is cooled to the original height of the sample. Steel wire with diameter ≤ 5.0mm shall not be subjected to upsetting test.

3. Microstructure

Table 4 Allowable range of depth of decarburization layer

	Table 4 – Permissible range of decarburized layer depth	Unit mm
Nominal wire diameter /d	Depth of complete decarburization	Total depth of decarburization
<10. 00	≤0. 02	≤0. 01 d
≥10.00—15.00	≤0. 02	≤0. 15
≥15.00〜25. 00	≤0. 03	≤0. 20
Note: For nominal wire diameters over 25.00 mm, the allowable decarburization depth range shall be agreed between supplier and purchaser.

6.1 microstructure
for steel wire produced by SALD process, the microstructure shall be spheroidized; the spheroidized level shall be negotiated by both parties, and the spheroidized level shall be evaluated according to JB/T 5074; the decarburized layer inspection method shall be determined by both parties through negotiation.
6.2 decarburized layer depth
For steel wires produced by SALD process, decarburized layer inspection shall be carried out. The allowable range of full decarburized layer depth and total decarburized layer depth (ferrite transition layer) on one side of the steel wire shall meet the provisions of Table 4. The decarburized layer inspection method shall be determined by both parties through negotiation. 6.3 carburization of steel wire produced by SALD process, no carburization is allowed on the surface of steel wire; if the supplier can guarantee, it is not necessary to inspect.

4. The comparison table of non-heat-treated cold heading steel grades and domestic and foreign grades is shown in Table B .1

Table B .1 Comparison Table of Non-heat Treatment Cold Ao Steel Brand and Domestic and Foreign Brand Comparison Table

统一数字代号	This standard	GB/T 6478-2001	ISO 4954:1993	EN 10263-2:2001	JIS G3507-1:2010	ASTM A29/A29M-12
U40048	ML04Al	ML04Al	CC4A	C4C	-	1005
U40068	ML06Al	-	-	-	SWRCH6A	1006
U40088	ML08Al	ML08Al	CC8A	C8C	SWRCH8A	1008
U40108	ML10Al	ML10Al	CC11A	C10C	SWRCH10A	1010
U40102	ML10	-	CCUA	C10C	SWRCH10K	1010
U40128	ML12Al	-	-	-	SWRCH12A	1012
U40122	ML12	-	-	-	SWRCH12K	1012
U40158	ML15Al	ML15Al	CC15A	C15C	SWRCH15A	1015
U40152	ML15	ML15	CC15K	C15C	SWRCH15K	1015
U40208	ML20Al	ML20Al	CC21A	C20C	SWRCH20A	1020
U40202	ML20	ML20	CC21K	C20C	SWRCH20K	1020