Common defects of thick-walled seamless steel pipes-Boiler Tubes,Heat-Exchanger Tubes,Superheater Tubes,Supplier,Beite

Common defects of thick-walled seamless steel pipes

Common defects of thick-walled seamless steel pipes

Seamless steel pipes are used in all walks of life. Among them, how much do you know about thick-walled seamless steel pipes? What problems will occur during its use? Let me lead you to learn about thick-walled seamless steel pipes. Hope to help you understand the thick-walled seamless steel pipe.

The unevenness of thick-walled seamless steel pipes is mainly manifested as uneven spiral wall, uneven linear wall thickness, and thick and thin wall thickness at the head and tail.

Uneven spiral wall of thick-walled seamless steel pipe

The uneven thickness of the spiral thick-walled steel pipe is caused by the uneven rolling center line of the piercing machine, the unequal inclination angle of the two rolls, or the too small front pressure of the plug. The uneven wall thickness is generally along the full length of the steel pipe. Spread spirally. The main measure is to adjust the rolling center line of the piercing machine to make the inclination angles of the two rolls equal, and to adjust the tube rolling mill according to the parameters given in the rolling table.

Linear wall thickness of thick-walled seamless steel pipe

The reason for the uneven linear wall thickness is the improper adjustment of the height of the core rod pre-piercing saddle. When the core rod pre-pierces the capillary tube on a certain surface, the temperature of the capillary tube on the contact surface will drop too fast, resulting in uneven wall thickness and even pulling Concave defects. The tandem roll gap is too small or too large. The centerline of the tube mill is deviated. The uneven reduction of single and double frames will result in a linear symmetrical deviation of ultra-thin (extra-thick) steel pipe in the direction of single frame and ultra-thick (ultra-thin) in the direction of double frames.

Uneven head wall thickness of thick-walled seamless steel pipe

The reason for the uneven wall thickness of the tail is that the front end of the tube blank is cut obliquely, the bend is too large, and the centering hole of the tube blank is not correct, which is easy to form the uneven wall thickness of the tube head.

The main measure is to adjust the height of the core rod pre-piercing saddle to ensure that the core rod and the capillary are aligned. The roll gap should be measured when changing the pass type and rolling specification, so that the actual roll gap and the rolling table are different. Adjust the rolling center line with optical centering installation, and it is necessary to correct the center line of the tube mill during annual overhaul.

Uneven wall thickness at the tail of thick-walled seamless steel pipe

The uneven wall thickness at the end of the capillary tube is caused by too large elongation coefficient during piercing, too high roll speed, and unstable rolling. The instability of steel throwing by the piercer is likely to cause uneven wall thickness at the tail of the capillary. The measure is to check the quality of the tube blank, to avoid the cutting slope and large reduction at the front end of the tube blank, and to correct the centering hole when changing the hole pattern or overhauling. Use a lower piercing speed to ensure the stability of rolling and the average degree of capillary wall thickness. When the roll speed is adjusted, the matched guide plate is also adjusted accordingly.

The above is the introduction that I have brought to you about the prone problems of thick-walled seamless steel pipes. I hope it will be helpful to you. If you want to know more information about steel pipes, please continue to pay attention to our website.