Cutting Welded Pipes

Thick-walled straight seam welded pipes refer to steel pipes with a wall thickness of 8mm or more, which are commonly known as thick-walled straight seam welded pipes. These pipes have better pressure resistance than thin-walled ones and are generally suitable for high-temperature, high-pressure applications, as well as bridge structural steelwork.

Thick-walled straight seam welded pipe control measures include: enhancing pre-production inspections of straight seam welded pipes and post-production casting quality; improving the cleanliness of molten steel in thick-walled straight seam welded pipes through measures such as proper protective pouring.

① The thick-walled straight seam welded pipe manufacturer reduces the contact surface temperature between molten iron and carbon bricks to below 1150℃ through cooling, causing a thin iron skin layer to form on the carbon brick surface to isolate the molten iron from the carbon bricks. This not only forms an iron skin layer but also creates a slag layer for protection. This approach utilizes full carbon micro-porous, even ultra-micro-porous carbon bricks, and strives to enhance their thermal conductivity to lower the surface temperature to below 1150℃.

② Utilizing ceramic bricks as lining to isolate contact between molten iron and carbon bricks, as carbon bricks are difficult to resist molten iron erosion, it is only feasible to lay a layer of ceramic bricks on the surface of carbon bricks, which is known as the ceramic cup wall. The ceramic cup wall is useful only when the carbon bricks' resistance to molten iron erosion reaches the level of ceramic refractory materials. The welding process of thick-walled straight seam pipes begins at the exit of the heating furnace. After the pipe billet is descaled with high-pressure water at the exit of the heating furnace, its front end is flash-welded to the tail end of the previous steel billet, which has already entered the rough rolling mill.