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.

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

1) Brand: SMC

2) Wire diameter: 5.5mm - 30mm

3) Coil weight: 2,000kg

4) 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. 

5) Technic Process: Pickling & coating, Intermediate drawing, Spheroidized annealing, Skin pass

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

Process of Cold Heading Quality Steel 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.

Chemical composition of Cold Heading Quality Steel Wire Rod:

Packaging of Cold Heading Quality Steel 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:

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:                                    

1) Automative:                                                                                                   

a) Engine: spark plug shell, cylinder head bolt, piston rod, etc.

b) Steering system (ball joint stud, tie rod pin, pinion, etc.)

c) Wheel: hub bolt, nut, etc.

2) Airplanes: High-tension bolts for wings

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

4) Construction: fastener bolt, etc.

5) Electronic parts: Material for Switch Relay

6) Industrial machines & Electronic parts : fastener bolt, nut, screw, etc.