Defects in the pores (pinholes) of the heating coil are generally very small, often due to the formation of small holes in the surface of the heating coil due to the rupture of subcutaneous bubbles in the molten steel during the casting process. Steel slabs and continuous casting slabs have more air holes than rolled slabs. The presence of pores in the heating ring indicates that the gas content in the steel may be relatively high. After rolling, the heating ring with air holes (pinholes) will form small flying skins on the surface of the steel pipe. This kind of defect is easy to be confused with the small flying skin defect that causes "scratch" on the surface of the heating ring due to the aging of the perforated roll.
Generally speaking, the aging of the perforated rolls will damage the surface of the heating ring during perforation, causing small flying skins on the capillary tube surface. The amount of such flying skins is large and regular.
Shanghai Xionglei Environmental Protection Technology Co., Ltd. is located in Qingpu District, Shanghai, the center of the Yangtze River Delta economic circle. It is a comprehensive enterprise integrating R & D, manufacturing, marketing and online sales. The company is mainly engaged in the production and sales of electric heating components and equipment; and technical consulting, system design and project construction of electric heating engineering projects.
The company's products mainly include: various electric heating coils , stainless steel mica electric heating coils, ceramic electric heating coils , cast aluminum electric heating coils , cast copper electric heating coils, cast iron electric heating coils, electric heating coils for injection molding machines, and extruder Electric heating coil, explosion-proof electric heating coil, etc. Products are widely used in chemical fiber, textile, metallurgy, petroleum, chemical, communications, electronics, food, medical, plastic, machinery and other industries.