COLD FORMING MATERIALS

ML42Mn cold heading wire

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ML42Mn cold heading wire

wire diameter: 0.40-46mm

tensile strength: Please refer to the technical data page

Shanghai Creation Group Co.,Ltd. is a benchmark enterprise for cold heading wire rod in China. The production management team has an average of more than 15 years of industry experience. Most of the cooperative customers are first-level suppliers to global automobile companies, and all raw materials come from well-known domestic steel mills. All production orders are 100% traceable.

Specification

:Cold drawing- HD

:Cold drawing + spheroidizing annealing + light drawing- SALD

:Annealing + cold drawing + spheroidizing annealing + light drawing- ASALD;

:Cold drawn + spheroidizing annealing- SA

Specification

-:Wire surface is continuous and smooth

-:No joints, overlaps, pits, scratches and pull-out marks

-:no rusting

Specification

-:automotive industry

-:the building materials industry

-:machinery and equipment industry

-:other industries

Case Study

Products & Service

Wire rod

Pickling and phosphating

Cold drawing

Spheroidizing annealing

check

finished product

1. chemical composition

Chemical composition, mass fraction % refer to GB 28906-2012

2. mechanical properties

Table 3 Mechanical properties of quenched and tempered carbon steel wire

Steel grade a	Diameter / mm	SALD			SA
Steel grade a	Diameter / mm	Tensile strength Rm/ MPa	Reduction of area Z/ %	Rockwell hardness / HRB	Tensile strength Rm MPa	Reduction of area Z/ %	Rockwell hardness / HRB
ML25 ML25Mn ML30Mn ML30 ML35	≤6.00	490-690	≥55	-	380-560	≥60	≤86
	>6.00-12.00	470-650	≥55	-
	>12.00-25.00	450-600	≥50	≤89
ML40 ML35Mn	≤6.00	550-730	≥55	-	430-580	≥60	≤87
	>6.00-12.00	500-670	≥55	-
	>12.00-25.00	450-600	≥50	≤89
ML45 ML42Mn	≤6.00	590-760	≥55	-	450-600	≥60	≤89
	>6.00-12.00	570-720	≥55	-
	>12.00-25.00	470-620	≥50	≤96
a For reference on the grade's chemical composition, see GB/T 6478.

2.1 The mechanical properties of steel wires delivered in HD state shall be determined through negotiation between the supply and demand parties.
2.2 The mechanical properties of the quenched and tempered steel wire in the delivery state shall comply with the provisions in Tables 3 and 4.
2.3 When steel wires are delivered in straight or polished state, a 10% fluctuation in mechanical properties is allowed.
2.4 The mechanical properties of steel wires with nominal diameters greater than 25.00mm shall be determined through negotiation between the supply and demand parties.
2.5 The mechanical properties of brands not listed in the table shall be determined through negotiation between the supply and demand parties.
2.6 upsetting
The steel wire specimen is cold-upset forged to one half of the original specimen height, and there shall be no cracks or cracks on the surface. It can also be forged to one-third or one-quarter of the height of the original specimen upon agreement between both parties.

3. microstructure

Table 6 Allowable range of decarburized layer depth

The spheroidized structure of the steel wire treated by spheroidized annealing can be inspected according to the requirements of the buyer and stated in the contract. The qualification level and test method shall be negotiated between the supply and demand parties.

Nominal wire diameter	Depth of complete decarburization	Total depth of decarburization
≤8.00	≤0.02	≤0.10
>8.00-15.0	≤0.02	≤0.15
>15.0-25.0	≤0.03	≤0.20
>25.0-45.0	By agreement	By agreement

3.1 decarburized layer
According to the requirements of the buyer and stated in the contract, the decarburization layer on the surface of the steel wire can be inspected. The allowable depth range of the full decarburization layer and the total decarburization layer (ferrite + transition layer) of the steel wire should comply with the provisions of Table 6. When the decarburization layer needs special requirements, it will be determined through consultation between the supply and demand parties. The carbon content is no more than 0. For 30% steel wire, the inspection method shall be negotiated by both the supply and demand parties.
3.2 Carbon increase
The surface of the steel wire shall not be carburized. If the supplier can guarantee it, no inspection can be carried out.

4. surface quality

4.1 The surface of the steel wire should be smooth and free of cracks, scarring, folds, delamination, pull marks and rust. However, individual pits, convexities, indentations and scratches with a depth not exceeding half of the diameter tolerance are allowed. Oxide color is allowed on the surface of steel wire delivered in annealed state.
4.2 The surface coating requirements of steel wire shall be determined through consultation between the supply and demand parties.