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    The steel blackening agent of Delishin Brand employs the principle of high polymer organic polymerization and uses the afterheat of tempering process within the heat treatment to form a film and blacken. The formulated working solution can be recycled and is easy to operate, being a kind of new environment-friendly, energy-saving and water conservative steel surface treatment material and the best solution to reduce the production costs. It is widely used in the surface blackening of all kinds of iron and steel parts such as standard parts, fasteners, screws, nuts, chains, gears, springs, elastic pads, bicycle parts and accessories, auto parts, machine parts, hydraulic parts, engineering machinery parts and railway equipment which are made of iron and steel materials as carbon constructional steel, alloy constructional steel, cast iron and powder metallurgy etc.
 
 
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