Under what circumstances will the combination screws rust?

2023-09-22

The screws are exposed to the sun, wind, and rain every day in very humid conditions. Over time, there will definitely be some rust. For example, in contact with some acid-base chemicals, a chemical reaction occurs. Causing corrosion and rusting, there is also a stainless steel screw used in seawater, and SUS201 stainless steel screw used in seawater with strong salinity. If soaked for a long time, it can cause corrosion and rusting of the workpiece.

The customer applied excessive force when using stainless steel combination screws. Generally, you can perform a torque test to see what the smaller breaking force is, and then adjust the torque. If high screw torque is required, heat treatment should be performed on the screw. Currently, stainless steel 410 material can be heat treated. After heat treatment, the surface hardness of stainless steel 410 screws is HV580-680, and the core hardness is HV350-450.

The local corrosion forms of screws are particularly prominent, including combustion and ignition, hydrogen absorption and hydrogen embrittlement, pitting corrosion, crevice corrosion, and welding corrosion. Among them, combustion and ignition, hydrogen absorption and hydrogen embrittlement are particularly serious forms of corrosion damage. If encountering these issues during the production of titanium screws, it is important to pay attention and promptly check the corrosion of the titanium wire in order to better grasp it.

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