COLD FORMING MATERIALS

ML20MnB cold heading wire rod

MATERIALSENGINEERINGCREATION GROUP

Products / GB National Standard / GB/T 5953.1

ML20MnB cold heading wire rod

Wire diameter: 0.40-46mm

Tensile Strength: Please refer to the technical parameters page

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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

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

2. Mechanical properties

Table 5 Mechanical properties of boron-containing steel wires

Steel grade a	SALD			SA
Steel grade a	Tensile strength Rm/ MPa	Reduction of area Z/ %	Rockwell hardness / HRB	Tensile strength Rm/ MPa	Reduction of area z %	Rockwell hardness / HRB
ML20B	≤600	≥55	≤89	≤550	≥65	≤85
ML28B	≤620	≥55	≤90	≤570	≥65	≤87
ML35B	≤630	≥55	≤91	≤580	≥65	≤88
ML20MnB	≤630	≥55	≤91	≤580	≥65	≤88
ML30MnB	≤660	≥55	≤93	≤610	≥65	≤90
ML35MnB	≤680	≥55	≤94	≤630	≥65	≤91
ML40MnB	≤680	≥55	≤94	≤630	≥65	≤91
ML15MnVB	≤660	≥55	≤93	≤610	≥65	≤90
ML20MnVB	≤630	≥55	≤91	≤580	≥65	≤88
ML20MnTiB	≤630	≥55	≤91	≤580	≥65	≤88
Note: For steel wire with a diameter below 3.00 mm, the reduction of area is for reference only.
a For reference on the grade's chemical composition, see GB/T 6478。

2.1 The mechanical properties of steel wire delivered in HD state shall be determined by both parties through negotiation.
2.2 The mechanical properties of boron-containing steel wires with a nominal diameter of not more than 25. 0mm in the delivery state shall meet the requirements of Table 5.
When the 2.3 steel wire is delivered in straight or polished state, the mechanical properties are allowed to fluctuate by 10%.
2.4 The mechanical properties of steel wire with nominal diameter greater than 25.00mm shall be determined by both parties through negotiation.
The mechanical properties of the grades not listed in the 2.5 table shall be determined by both parties through negotiation.
2.6 upsetting
The steel wire sample shall be cold-forged to the 1/2 of the original sample height, and the surface shall be free of cracks and cracks. It can also be forged to the 1/3 or 1/4 of the original specimen height by mutual agreement.

3. Microstructure

Table 6 Allowable range of decarburized layer depth

The spheroidizing structure of steel wire treated by spheroidizing annealing can be inspected according to the requirements of the buyer and indicated in the contract. The qualified level and test method shall be negotiated by both 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 indicated in the contract, the decarburized layer on the surface of the steel wire can be inspected. the allowable depth range of the steel wire-edge full decarburized layer and the total decarburized layer (ferrite + transition layer) shall conform to the provisions of table 6. when the decarburized layer is subject to special requirements, it shall be determined by both parties through negotiation. For steel wires with carbon content not more than 0.30%, the inspection method shall be negotiated by both parties.
Carbon increase in 3.2
There shall be no carbon increase on the surface of steel wire. The supplier may not do inspection if it can guarantee.

4. Surface quality

The surface of the 4.1 steel wire shall be smooth and free from cracks, scarring, folding, delamination, drawing marks and rust. However, individual pits, convexities, dents and scratches with a depth not exceeding half of the diameter tolerance are allowed. The surface of steel wire delivered in annealed state is allowed to have oxidation color.
The surface coating requirements of 4.2 steel wire shall be determined by both parties through negotiation.

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