Brief description of roasted blue in roasted blue packing steel belt

Although the baked blue strapping steel strip is called baked blue, it actually uses chemicals such as sodium nitrate to oxidize the metal surface to oxides at high temperatures to form a protective layer that is more resistant to rust. According to different metal materials (carbon steel, stainless steel, aluminum alloy), different chemicals, different construction procedures (temperature control, pre-sandblasting, etc.) will produce different colors, the most common is very close to black dark blue black .
Baked blue can prevent steel from rusting. The guns are mostly baked blue. Water and protective gas (such as nitrogen) may be put in
Baked blue is just to moisten the parts with water and then burn it with fire. Note that the water is best to be pure. If it is not pure, markings will appear. For example, if the two ends of the steel strip are polished by yourself, it is better to buy a few thin Water sandpaper, dipped in water and sanded in one direction. Do not grind back and forth. Be patient. Use moderate and even force. When baking on the fire, the temperature should not be too high until the color changes, otherwise the magazine will anneal. Baking on the oven is also possible, but the gas is not pure and the color will change again. The color is the color of burning iron, soak it in boiling thick soap solution for ten minutes, (saponify) and soak in hot oil at the end.