What should I do to check the quality of the stainless steel filter mesh?
No matter which industry, whether the product is qualified,there are specific inspection methods and acceptance criteria. The same is true for the filter industry. Today, we briefly describe the inspection methods for stainless steel filters mesh and the quality standards to be achieved.
Let us first talk about the requirements that the qualified stainless steel filter screen needs to meet. The inspection must be carried out in accordance with the technical requirements of the national standard GB/T5330-2003, and the relevant measuring tools and test instruments should be used correctly. The quality inspection of the stainless steel square hole net does not use the sampling method. To meet the following requirements is qualified:
Stainless steel filter diameter and deviation, material material inspection. The surface of the stainless steel wire shall be smooth and bright, and shall not have longitudinal flaws, burrs, rust and other defects; the wire diameter tolerance shall comply with the regulations, and the material shall meet the requirements.
Inspection of the weaving accuracy of stainless steel filters. Divided into 3 levels: first-class accuracy, mesh limit deviation can not exceed 6%; second-level accuracy does not exceed 9%; third-level accuracy does not exceed 12%; mainly the test of the arithmetic mean of the mesh and the size of the large mesh test.
Inspection of the quality of stainless steel filter weaving. In the production process, it is impossible for the wire mesh to have no manufacturing defects. Under normal circumstances, the metal mesh delivered in rolls is not allowed to have major defects, allowing a small number of important defects to exist, allowing a certain number of general defects to exist.
What are the surface treatment methods for stainless steel mesh?
The surface treatment technology of stainless steel mesh has the following treatment methods: 1 surface whitening treatment; 2 surface mirror bright treatment; 3 surface coloring treatment.
The surface of the stainless steel mesh is whitened and treated: the stainless steel is processed in the process of rolling, burring, welding or artificial surface baking and heating to produce black scale. This hard gray-black oxide scale is mainly composed of two kinds of EO4 components, NiCr2O4 and NiF, which were previously removed by strong etching using hydrofluoric acid and nitric acid. However, this method is costly, pollutes the environment, is harmful to the human body, is highly corrosive, and is gradually being eliminated.
There are two main methods for the treatment of scale in stainless steel mesh: stainless steel mesh sandblasting (pill) method: mainly by spraying micro-glass beads to remove the black scale on the surface.
Stainless steel mesh chemistry: Dipping with a non-polluting pickling passivation paste and a non-toxic, non-toxic cleaning solution with inorganic additives. Thereby achieving the purpose of whitening treatment of stainless steel color. After processing, it basically looks like a dull color. This method is suitable for large and complex products.
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