Cold Heading Quality Steel Wire Rod (CHQ Wire Rod) involves particular raw materials and chemistry 

to withstand swedging and heading and forming with great quality.  

It is suitable for fastener and cold heading applications such as bolts, nuts, screws, rivets, nails, etc.

SMC keeps strict control of the surface and chemical composition of the wire to offer the best product.

Specifications of Cold Heading Quality Steel Wire Rod (CHQ Wire Rod):

1) Wire diameter: 5.5mm - 30mm

2) Coil weight: 2,000kg

3) Grade: SUJ2, SWCH6A-10A, SWCH12A-45K, SCM415-420, SCM435-440, 

SCr415-440, SWCH6A-22A, SWCH6A, SNCM240, SCr415-420, SCr435-440, 

SCM415-420, SCM435-440, SCr415-420, SCM415-420, etc. 

4) Technic Process: Pickling & coating, intermediate drawing, spheroidized annealing, skin pass

5) Alloy or not: Alloy

6) Diameter tolerance: +/-0.04mm for below 10mm, and above 10mm +/-0.55mm

7) Other available material:

           a) Low and medium carbon steel

           b) Alloy steel

           c) Stainless steel

           d) Non ferrous materials like copper and brass, etc.

8) Executive standard: ASTM A545

9) Customized shapes and sizes are accepted

Process of Cold Heading Quality Steel Wire Rod (CHQ Wire Rod):

Pickling & coating 

The hot-rolled coil or wire rod passes through the pickling line,

where hydrochloric acid solution is used to remove surface scale for clean surface finish

before further processing and to form a lubrication film on the surface

to reduce the coefficient of friction in the drawing and cold working process.

The Gantry Crane moves between the tank during the process.

Intermediate drawing 

This process which produces half-finished products for the following stage

improves the spherodized ratio during spheroidized annealing.

The wire drawing machine composed of Supply Stand, Drawing Drum,

Take up stages produces half-finished coil products. 

Spheroidized annealing 

This annealing process with the purpose of obtaining spheroidized carbides facilitates the cold works.

Once inserted in the heat treatment furnace, the process takes place in the order of controlled heating

up to a given time, temperature and furnace atmosphere, along with maintenance at such temperature

during a certain period and cooling controlled in accordance with the purpose intended.

This process is controlled by automatic heat cycle. 

Pickling & coating 

The hot-rolled wire rod passes through the pickling line,

where hydrochloric acid solution is used to remove surface scale for clean surface finish

before further processing and to form a lubrication film on the surface

to reduce the coefficient of friction in the drawing and cold working process. 

Skin pass 

The wire drawing machine produces half-finished coils

where products meet the customers' needs in terms of the size and mechanical properties of products. 

Chemical composition of Cold Heading Quality Steel Wire Rod (CHQ Wire Rod):

Parameters of Cold Heading Quality Steel Wire Rod（CHQ Wire Rod）:

Packaging of Cold Heading Quality Steel Wire Rod (CHQ Wire Rod)

Shanghai Metal Products are packed and labeled according to the regulations and customer's requests. Great care is taken to avoid any damage which might be caused during storage or transportation. In addition, clear labels are tagged on the outside of the packages for easy identification of the product I. D. and quality information.

1) Shanghai Metal Standard

2) Customization

Features of Cold Heading Quality Steel Wire Rod (CHQ Wire Rod):

1) High strength and hardness

2) High production efficiency 

3) Low cost and strong fatigue resistance

4) Grain flow which improves the finished part grain structure 

Applications of Cold Heading Quality Steel Wire Rod (CHQ Wire Rod):

1) Airplanes: high-tension bolts for wings

2) Bearing : roller bearing, ball bearing, etc.

3) Construction: fastener bolt, etc.

4) Electronic parts: material for switch relay

5) Industrial machines & electronic parts : fastener bolt, nut, screw, etc.