Description

The annealing process involves heating the metal to a certain temperature for a certain period of time, followed by slow cooling to achieve a stable structure in equilibrium. Black annealed wire is available in a variety of specifications and standards on the market. Wire diameters include 0.5mm, 0.8mm, 1.0mm, 1.2mm, 1.6mm, 2.0mm, 2.5mm, 3.0mm, and 4.0mm, depending on the application. Each roll weighs approximately 5-25 kg and is wrapped in moisture-proof paper or plastic film. Custom packaging is also available upon request. Protect from moisture and rain, and avoid mechanical damage.

Main production process of black annealed steel wire

Black annealed wire must be produced according to strict production procedures. The main production processes are as follows:

Pickling

The primary purpose of pickling is to remove surface scale and oil contamination. Care must be taken to control the concentration, time, and temperature throughout the process to avoid corrosion on the steel surface.

Cold drawing

The primary purpose of cold drawing is to achieve a smoother surface finish, but this can compromise ductility.

Annealing

The annealing temperature is typically 600-750°C, and the holding time needs to be adjusted based on the wire diameter. Different wire diameters require different holding times.

Surface treatment

After annealing, corrosion resistance must also be considered. For high-precision products, environmentally friendly water-based pickling agents may be used. For high-precision black annealed wire, cold drawing can be performed again after annealing. Strictly controlling the deformation and adjusting the tension can prevent flaking of the surface oxide layer.

Characteristics of black annealed steel wire raw materials

Many users wonder why similar products can have such significant performance differences. For black annealed wire, the production process significantly impacts performance characteristics. Furthermore, the raw material's inherent properties play a crucial role:

Low Hardness

Annealing reduces the hardness of the steel wire, but this also increases its flexibility, making it easier to bend and twist during use, adapting to various complex scenarios.

Tensile Strength

Generally, the tensile strength of black annealed wire ranges from 300-500 MPa. The specific tensile strength depends on the model and specifications, so when purchasing, be sure to ensure it can withstand the appropriate tensile forces.

Rust Resistance

The black oxide film on the surface provides some rust resistance. The surface is smooth, allowing for slight oxidization and a uniform appearance.

What are the significant differences between black annealed wire and ordinary steel wire?

Black annealed wire is a technological advancement that can meet the core needs of different users. For example, in gardening, when fixing vines and supporting seedlings, it needs to be exposed to the outdoors for a long time. Compared with ordinary steel wire, it can provide rust prevention for a longer time. Its flexibility is suitable for wrapping plants, especially in secondary use scenarios. It can withstand greater loads and improve the cost-effectiveness of the product by reducing costs.