Stainless Steel Wire Mesh Cleaning

1. Wire rod source surface treatment and cleaning technology

Since the wire rod is rolled in non vacuum, there must be oxide scale on the surface. When removing the oxide scale on the surface, the principle of 100% recovery shall be considered. Several mechanical rust removal methods are listed below.

(1) Mechanical bending derusting method, which has little effect on removing stainless steel scale, but can loosen the scale.

(2) Mechanical sand blasting derusting method, due to the requirements of dust sealing, has complex operation, rough surface, poor quality and high noise. Steel slag and sand form a mixture and cannot be recycled.

(3) Mechanical steel brushing method has the advantages of simple operation, good surface quality and high steel slag recovery rate, but it covers a large area.

(4) Mechanical peeling and derusting method has the advantages of simple operation, good surface quality, high recovery rate of steel slag, but high tool consumption.

(5) The rust removal method of mechanical grinder has the advantages of simple operation and less investment, but the surface quality is poor, the oxide scale is not cleaned, and the recovery rate of steel slag is low. It is suitable for the surface polishing of finished products.

2. Drawing cleaning technology

For continuous drawing, water phosphate coating is adopted, and the coating is attached to the steel wire surface in the form of crystal; The lubricant adopts pure sodium low melting point lubricant. Its advantage is that it is soluble in water and easy to remove. The generated wastewater can be reused after filtration and precipitation with less pollution.

For single drawing machine, uncoated technology, on-line heating device and bright drawing agent are adopted to form a protective film on the surface of steel wire without coating treatment.

3. Heat treatment cleaning technology

If there is no oxidation on the steel wire surface, there is no need to remove the oxide skin, which avoids the environmental pollution of this process.

(1) Ammonia decomposition gas break protection bell type furnace. Place the steel wire on the platform in the middle of the furnace body, put down the inner cover and seal the inner cover space, put down the heating cover outside, and the inner wall of the heating cover is equipped with heating elements. The heating elements heat the inner cover in the form of radiation, and the inner cover also heats the built-in steel wire in the form of radiation heat. The vent pipe of the inner cover platform base is filled with mixed gas (hydrogen + ammonia), and the air flow is controlled by the vent pipe to keep the atmosphere in the inner cover space at positive pressure. Because the gas is inert gas, the steel wire surface does not oxidize at high temperature, which plays a role in protecting the surface. This technology is applicable to the heat treatment of steel wires below 800 ℃, such as martensitic and ferritic stainless steel.

(2) Vacuum well furnace. Vacuum well furnace is evacuated by vacuum

The air pump (vacuum pump) draws out the air in the furnace to a certain vacuum degree to ensure that the steel wire is heat treated in non oxidizing medium. The treatment temperature of this method is above 1200 ℃, and it can treat large-size steel wires such as heat-resistant stainless steel 0Cr25Ni20 SI2.

(3) Ammonia decomposition gas protection continuous annealing furnace. It is composed of setting out device, branching frame, uncoating tank, clean water flushing tank, drying furnace, heating furnace, cooling tank, take-up device and ammonia decomposition furnace. The heating furnace adopts multi tube high-temperature furnace tube, with a single steel wire passing through and protective gas passing through the tube, so as to achieve the purpose of continuous treatment. Applicable to must Φ The production of stainless steel wire below 8.0mm can obtain good surface quality and strip performance.