... spring steel, Refractory steel, stainless steel, high temperature Resisting alloy, corrosion-resistant alloy and bronze.Wire ... Stamping, bending, welding, casting, punching, machingSurface treatment Powder coating, zinc plated, nickel-chrome plated, painting, heat treatment ... heavy machines, printing machines, textile machines, high-low pressure switch springs, valve springs, safety valve mould ...