The Reason why Railway Bolts is Black

It is common to see some of the Railway Bolts cross recesses black, or the thread is black and the wash is not clean. So what is the reason that the Railway Bolts can't be washed clean? How can I better solve the blackening phenomenon of Railway Bolts? Rail Spike Manufacturer tells you about the causes and solutions of Railway Bolts.
Bridge Bolt is usually black because of the high heat generated during cold or tooth decay. Usually occurs in the cross section. In the production process, the heat can be dispersed in time through the supply of lubricating oil, and the speed of the machine can be appropriately adjusted to avoid problems. Of course, in addition to the technical reasons for the Bridge Bolt black, it is also possible that the material problem of the Bridge Bolt itself will also cause the surface of the stainless steel screw to blacken.
Bridge Bolt
Bridge Bolt blackened solution:
Degreasing - water - cross tank cleaning agent - water - neutral - water - drying.
Warm the stainless steel screw cross-slot cleaning agent to 70 degrees, then put the stainless steel screw product after degreasing into the cross-slot cleaning agent, soak for 5-15 minutes, pass through the water, neutralize, and blow dry.

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