Iron Iron is one of the most commonly used metals. It's hard and malleable and has strong ferromagnetic property, good flexibility and thermal conductivity. Iron usually contains carbon; thus when it is exposed to oxygen and water, it is easily corroded. However, high purity iron is not easily to have corrosion problem.
Carbon Steel Carbon steel is widely defined as the steel containing five elements, mainly iron, steel and small amounts of manganese. Steel with higher than 0.76wt% of carbon content is defined as high carbon steel. On the other hand, steel with less than 0.76wt% of carbon content is defined as low carbon steel.
Alloy steels are steels alloyed with a variety of elements, which have different characteristics. They can mostly be used in the manufacture of shafts, gears, power screws, nuts, automobile motorcycle parts, machinery parts, and hardened surface of important machine parts.
Boron does not affect the strength of ferrite, so it can be used to increase the harden ability without sacrificing extension, molding, and machinability. Boron-treated steels can, often 0.0005 ~ 0.003% added, significantly increase the hardening of steel, particularly effective in low-carbon steel.
Stainless Steel The main component of stainless steel is iron and chromium is the major alloying elements. In general, stainless steel should contain the chromium content of at least 11%, because if the chromium content is insufficient, the surface of stainless steel cannot form a dense protective layer of chromium oxide, and lose the function of anti-rust. If chromium is adequate, at room temperature, it will not rust.
Copper Pure copper is a tough, soft, malleable, and purple-red and shiny metal. Its electrical and thermal conductivity is very high, second only to silver. The copper's color looks like gold, but reddish. It is stable in dry air, which can maintain the metallic luster. However, in humid air, the surface of the inner layer will generate patina, no longer protected from oxidation.
Aluminum Aluminum has special chemical and physical characteristics. It is one of common used metals in industry today, not only for its light weight and firm texture, but also its good ductility, electrical conductivity, thermal conductivity, heat resistance and resistance to nuclear radiation.


  Heat Treatment

Quenching and Tempering (Refining) Quenching and Tempering (Refining): Changing the inner compositions of material particles to achieve the required level of demand.
Carburizing Heat Treatment Using carbon to penetrate the surface of screws to harden the surface layer.
Nitridation In general, if the steel contains one or more compounds of nitrides, it shows good effect after nitridation. Since the products treated with this method have excellent wear resistance, fatigue resistance, corrosion resistance and high temperature, it gradually expands its range of applications.



Suface Treatment

Electroplating Treatment Trivalent Chromium -
Yellow Zinc、White Zinc、Black Zinc
Hexavalent Chromium -
Yellow Zinc、White Zinc、Black Zinc、Green、Nickel、Nickel -Pure Copper
Electrocoating Treatment Dacrotizing -
Using chemical changes to do electroplating and then coat the material to the screw surface to increase resistance to rust and anti-oxidation, up to 300 hours salt water test.
Nylok -
Applying coating to threaded fasteners to keep the unit stable and the nuts from loosening. If the thread works properly, it is very difficult to fall, little chance to naturally loose.
Acid-Rinsing Treatment Blackfast and Rustproof Treatment -
Blackfast uses acidic concentrated liquid diluted with water, by immersion to produce black surface oxide film. The formation of color depends on the reaction rate and the concentration of the solution.
Phosphates -
Applying the use of immersion to form 5 to 15 microns thick undissolved manganese phosphate coating in the steel surface. It is widely used in antirust and abrasion resistance in steel.

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