Materials for flat washer:
Flat washers without mechanical properties requirements are generally made of corner materials, such as Q235A. When hardness requirements are not high, thicker sheet materials can be calended to reach the required hardness. Gaskets such as spring pads are generally made of 65Mn 70# or S 50CM -- S 70CM, which should be heat treated (quenching + tempering).
Rivets, pin shaft class:
Rivet, pin shaft class general material and bolts are the same, but some rivet hardness can not be too high, and even some requirements of HRB60 below, the general normalization of material hardness in HRB70-80, so some to go through annealing to achieve the performance requirements.
Self-tapping nails generally use C1018 C1020 C1022 and other materials, but some domestic manufacturers in order to save costs, cut corners, using 18# 15# 20# more manufacturers with Q235A, and then surface carburization, so made of the heart toughness of the self-tapping nails can not meet the requirements, easy to break.
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