The reason for the fracture on the surface of Din 1.4303 hot rolled stainless steel Coil
Fractures on the surface of Din 1.4303 hot rolled stainless steel Coil will affect its sales price. What causes the surface to crack? Let's analyze it:
Generally speaking, the temperature of the furnace supply air is about 200 °C, while the heat-resistant temperature of this steel strip is less than 100 °C (air supply temperature). The manufacturer's furnace supply air temperature is lower than 100°C, that is, once the supply air temperature exceeds 100°C, the bypass flue needs to be opened to cut off the flue gas. The purpose of this is for the air preheater. The supply air temperature decreases.
If the furnace body does not have a bypass flue, but a waste heat steam generator is added, then the Din 1.4303 hot rolled stainless steel Coil is prone to breakage. Generally speaking, the waste heat steam generator needs to be installed in front of the air preheater. , which can reduce the flue gas temperature in the air preheater.
Keep the temperature of the supply air between 80 and 90 °C, so that the temperature is almost lower than 100 °C, the surface of Din 1.4303 hot rolled stainless steel Coil is not easy to break, and it will not produce obvious oxides.
If the waste heat steam generator is not installed, the temperature of the supply air in the furnace is as high as 200 ℃.
Din 1.4303 hot rolled stainless steel Coil often has cracks on the surface. If the waste heat steam generator is installed, the supply air temperature will be reduced, not only is it not easy to break the Din 1.4303 hot rolled stainless steel Coil, but it can improve the oxidation performance and prolong the service life.
In addition, because Din 1.4303 hot rolled stainless steel Coil has been in over-temperature operation for a long time, it is worth that oxides appear on its surface, so that the mechanical strength of the surface of the steel strip decreases, the texture becomes brittle, and cracks gradually appear.