What are the middle-of-the-road type of door hinge made of? stainless steel?

stainless steel?
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Yes or regular steel
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no, stainless steel is an ungrade, most r made from common steel afterwards electroplated, brass, silver colors.

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Answers:    Its either brass,steel or stainless steel

Dont be fooled if it LOOKS stainless,doesnt propose it is,it can just be nickel-plated steel

To check attain a refrigerator magnet and put it to the hinge(away from the screws) and if it sticks,..its steel

If it doesnt its either brass or stainless

It could be another type of cheap alloy,possibly aluminum alloy but thats not adjectives