Control Measures of ASTM A53 Seamless Steel Tube Side

In all steel pipe, ASTM A53 seamless steel tube occupies a large proportion, but the actual production of seamless steel pipe is often used in controlled rolling and cooling technology, easy to control the process of cooling due to uneven cooling plate defects, seriously affecting product quality and contract cash . Plate side wave is one of the more serious one.

Seamless steel tube side of the wave-shaped defects are due to uneven cooling caused by lateral. On-site tracking found that there are obvious on both sides of the side wave plate "band-shaped supercooled" area. The transverse cooling caused by uneven factors are:

1) There are transverse temperature differences between the center and the sides of the seamless tube.

2) seamless steel pipe in the controlled rolling process, the middle and edge there is a large temperature difference.

3) The finish rolling mill adopts "CVC" rolling process, which is caused by the difference of the two sides of the steel plate and the middle extension, which causes the internal stress of the steel plate, which does not reach the degree of bilateral wave shape. , But is further increased during the subsequent cooling.

4) In the process of controlling the cooling process of seamless steel pipe, not only the transformation of the structure occurs with the change of temperature, but also the complex stress change occurs.