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What is the differences between the characteristics of sintered mesh and sintered felt?

Feb. 13, 2023

What is the differences between the characteristics of sintered mesh and sintered felt?

Both sintered mesh and sintered felt are new filter materials made of stainless steel, with the characteristics of corrosion resistance, high temperature resistance, and stable filtration accuracy. And both are widely used in nuclear industry, petrochemical industry, aerospace, food and medicine, metallurgical machinery, power electronics and other fields. So whether to choose sintered mesh or sintered felt has become a tangled problem for customers.

1. Materials:

The sintered wire mesh is made of overlapping multiple stainless steel wire meshes of the same type or different ones, which are made by repeated pressure, rolling, and repeated vacuum sintering at 1260°C, followed by diffusion and solid solution. It has strong mechanical strength and overall rigidity; Stainless steel sintered felt is made of extremely fine metal fibers of different diameters through non-woven laying, overlapping configuration and high-temperature vacuum sintering at 1180°C.

2. Sintering process:

The sintering process of the sintered mesh is to overlap and sinter several layers of stainless steel metal braided meshes with different structures, and sinter the cross-section of the mesh.

The structure of sintered felt is orderly. And sintering is non-woven paving, which is to sinter metal fibers together in a disorderly manner.

To sum up, it can be seen that sintered mesh is a surface filter material with a large filtration range, while sintered felt is a deep filter material with a relatively high dirt holding capacity. Therefore, as a customer, you can according to According to your own actual situation and needs to choose the sintered aluminum material that suits you.

In stainless steel sintered wire mesh, stainless steel can be divided into two types based on chromium and chromium-nickel based on composition, and can be divided into austenite type, ferrite type, martensite type and austenite type according to metallographic structure. A ferrite type and many other types. Stainless steel is prone to metallurgical changes when it is heated by welding, resulting in deterioration of the welded joint area, and is extremely prone to thermal cracks during welding.

There are two problems in the welding of martensitic stainless steel, one is the hardening of the heat affected zone of the weld, and the other is the hysteresis crack caused by the action of diffusible hydrogen. The hardening of the heat-affected zone of the weld is because the martensitic stainless steel has the characteristics of hardening, and the hardening of the heat-affected zone becomes the cause of cracks. Lagging cracks are generally a crack that appears a few days after welding, and its location is generally at right angles to the weld metal.

Since ferritic stainless steel has no hardenability, hardening hardly occurs in the heat-affected zone of the weld. However, when the ferritic stainless steel is heated to the vicinity of the melting point, grain coarsening in the heat-affected zone will occur, which will reduce the plasticity and toughness of the steel at room temperature.

The main problems in the welding of austenitic stainless steel are hot cracks in the weld metal, precipitation of chromium carbides on the grain boundaries in the heat-affected zone of welding, and welding residual stress. The reason for the formation of welding cracks is mainly the chromium carbide precipitated by the influence of low melting point impurities on the austenite grain boundary, and its influence may cause intergranular corrosion. The residual welding stress refers to the large welding stress remaining when the welding deformation is restrained, and the result is very likely to cause stress corrosion accidents.

In stainless steel sintered wire mesh, because the welding properties of different types of stainless steel have different characteristics, it is necessary to choose an appropriate welding method to obtain a better post-welding effect.

Please visit our other introduction of sintered mesh screen: https://www.zhehanfilter.com/news/how-to-choose-a-high-quality-sintered-mesh-plate?.html  https://www.zhehanfilter.com/news/how-many-layers-of-stainless-steel-sintered-mesh.html 

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