By surface treatment of stainless steel rods can be divided into: stainless steel black bars, stainless steel acid white bar, stainless steel bright bars, stainless steel ground rods. Material Stainless steel can be divided into: 304,316,320,301,310,303,302 ,. 201, 201, 408,409,410,420,430, such as:. 304L stainless steel bar: 304 as a low-carbon steel, in general, corrosion resistance and 304 similar, but after welding or eliminate stress, its excellent corrosion resistance to the grain boundaries, in the absence heat treating the case, but also to maintain good corrosion resistance. Extensive use of stainless steel rods, there are a lot of myself in life can be seen, such as; aircraft engine blades, casing, fasteners, combustion chamber, disc, shaft, the outer wall of the combustion chamber, liquid oxygen kerosene engine, airframe, gas bottles, propulsion devices. Widely used in aerospace, aviation, nuclear energy, nuclear energy, petroleum, chemical, and food, environmental protection, marine development, the boiler heat exchanger.