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 thick-walled pipes have better pressure resistance compared to thin-walled ones and are generally suitable for high-temperature and high-pressure applications, as well as bridge structural steelwork.

Thick-walled straight seam pipe control measures include: strengthening pre-production inspections of straight seam pipes and cast billets; and improving the cleanliness of molten steel for thick-walled straight seam pipes through measures such as proper protective ladle slagging.

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, forming a thin iron skin layer on the carbon brick surface to isolate the contact between the molten iron and the carbon brick. This not only forms an iron skin layer but also forms a slag layer for protection. This view adopts full carbon microporous, even ultra-microporous carbon bricks, and strives to increase their thermal conductivity to lower the surface temperature to below 1150℃.

② Utilize ceramic brick linings to isolate contact between molten iron and carbon bricks. As carbon bricks are difficult to resist molten iron erosion, only by artificially laying a layer of ceramic bricks on the surface of the carbon bricks can the ceramic cup wall be formed. The ceramic cup is useful when the carbon brick's resistance to molten iron erosion matches the ceramic refractory material. The welding process of thick-walled straight seam pipes begins at the exit of the heating furnace. After the pipe billet is scaled off with high-pressure water at the furnace exit, its front end is flash-welded to the tail end of the previous steel billet that has entered the roughing mill.