1. Different production processes: Black annealed wire is made by placing the cold-drawn wire drawn from Q195 wire rod in an annealing container, calcining it at a high temperature of about 800°, keeping it for a short time, and then cooling it.
White annealed wire is made by placing cold-drawn wire drawn from Q195 wire rod in a vacuum annealing container, removing the air in the container, calcining at a high temperature of about 1000°, holding it for a long time, and then cooling slowly.
2. Comparison of surface cleanliness: The white annealed wire is white in color and has lost its oxide scale and impurities. Therefore, the surface of the white annealed wire is cleaner, free of impurities and has better adhesion than the black annealed wire, so it is more suitable for the processing of metal wire surface coatings. Such as plastic-coated wire, nylon rubber-coated wire, painted wire, etc.
3. Softness comparison: White annealed wire is softer than black annealed wire. Due to the long calcination time, white annealed wire is softer, so it is more suitable for bundling, such as building steel bar bundling and daily use.
4. Different tensile strength: Due to the difference in heat preservation time, the tensile strength of white annealed wire is lower and more uniform than that of black annealed wire, so it is more suitable for high-demand bundling, such as wire for automatic steel bar bundling machines, and multiple twisted bundle.
Post time: Nov-29-2023