The distinction between flat steel and steel strip
Cyanide is a chemical heat treatment, before the process is highly toxic, serious environmental pollution, the latest process can meet the requirements of environmental regulations, and if not necessary, the use of nitrogen treatment or carbonitriding better.
The first is to use cyanide cyanide salt, it is commonly referred to as the "cyanide", it is the metal surface while being carbon atoms and nitrogen in a chemical heat treatment process of saturated (cyanide containing carbon, nitrogen, assuming the metal is a, valence +n, cyanide formula a (CN) n).
Blue is to heat the steel or directly immersed in concentrated oxidizing solution in the air, material protection technology of oxide film on the surface of thin produce, also known as black. The blue steel parts can be carried out in the molten salt of sodium nitrite and sodium nitrate, can also be carried out at high temperature above 500 DEG C hot air and superheated steam, the more common is heating sodium nitrite in concentrated caustic soda. Solution composition, reaction time and the temperature of Bluing depends on steel matrix composition. Bluing film composition is magnetic iron oxide, the thickness of 0.5 to 1.5 microns, the color and the material composition and process conditions, a dark gray, dark blue, etc.. Bluing film separate corrosion resistance is poor, but the oil wax or paint varnish, corrosion resistance and friction resistance are improved. Blue, the workpiece has little effect on the quality of size and finish. It is commonly used in precision instruments, optical instruments, tools, hardness blocks and so on.
Flat bar is strip, mostly 30*3, 40*4, 50*5 and so on. Strip: Blue (sometimes called black) is a chemical treatment, the surface to form a dense oxide film, corrosion and decoration;
