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The purpose of annealing are:                                            

1. To soften the steel and improve ductility

2. To relieve internal stresses induced by some previous treatment

   (drawing, cold rolling, or uneven cooling after hot rolling the wire rod)

3. To remove coarseness of grain.

4. To cleans the wire by burning off any lubricant left from the wire drawing process.

 

Black annealed low carbon steel wire

Batch Annealing

In batch annealing, the wire is heated for several hours and then slowly cooled. Wire is placed in large furnaces. A shield is placed over the wire and the air is replaced with hydrogen to form atmosphere preventing the wire from burning or changing colors. An electric heat jacket is placed over the shield and a precise amount of required heating is administered for the proper length of time to clean and soften the metal. The wire annealed by the batch annealing process has much greater elongation than wire annealed by the strand annealing process.

Strand Annealing

In strand annealing, the wire is heated for a matter of minutes and then rapidly cooled. To anneal small diameter wire, the wire is pulled through tubes filled with hydrogen. These tubes are surrounded by heat. From the heated tubes, the wire travels through a second set of tubes immersed in water to cool the wire. The temper of the wire is determined in this operation by the heat inside the furnace and the speed at which the wire is pulled exits the strand annealing furnace. Each spool is monitored to ensure that the customers receive the highest quality drawn wire possible.

Products:

• Material:  Mild Carbon Steel Wire Rod Chinese GB Q195, Q235, etc
• Diameter available: 0.5mm-6.0mm
• Tensile strength:  30kg-70kg/mm2
• Elongation Rate:  3%-25%
• Weight/Coil:  0.1kg-800kg/coil
• Packing:  Coil, Box, Spool as per customer's request.  

 

The wire drawing process is a plastic deformation process. For a material to be possible to draw, it must be ductile and to be ductile, a steel wire must have a suitable large grain crystal structure. During drawing, the steel work hardens and it is therefore necessary to anneal or stress relief the wire. Through heat treatment, it is also possible to alter the steel characteristics to fit the demand of a specific application. There are mainly two ways of annealing such as the batch annealing and the strand annealing  

 

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