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Reasons for locking stainless steel fasteners

Update:06-09-2019
Summary:

There are often users who report that stainless steel f […]

There are often users who report that stainless steel fasteners sometimes have problems with locking, and similar phenomena do not occur when using carbon steel fasteners. Is stainless steel fasteners softer, carbon steel tight? What is the reason why the firmware is relatively hard?
That's right! Stainless steel and carbon steel are essentially different. Stainless steel has good ductility but its hardness is somewhat different from that of carbon steel. The hardness of the austenitic stainless steel grade 316 head A4-80 can only reach 8.8 grades equivalent to the hardness grade of carbon steel. However, this statement can only be said to be half right.
Locking often occurs on stainless steel, aluminum alloy and titanium alloy fasteners. These metal alloys have anti-corrosion properties and produce a thin layer of oxidation on the metal surface when the surface is damaged. Layer to prevent further deeper rust. When the stainless steel fasteners are locked, the pressure and heat generated between the teeth will destroy and erase the oxide layer between them, causing the metal tooth to directly block and then adhere. .
When the adhesion continues, the stainless steel fasteners are locked and can no longer be removed or installed. Usually this series of chain reactions takes place in just a few seconds, so understanding the characteristics of stainless steel products and following the correct procedures can effectively prevent the fasteners from locking.

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