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span style="font-size: 14px;">2)bluing3)phosphating
4)nickel-plated
5)zincing
6)heat treatment
7)greasing
8)quenching
9)tempering
10)oiling

3)phosphating
4)nickel-plated
5)zincing
6)heat treatment
7)greasing
8)quenching
9)tempering
10)oiling

