ASTM A519 Grade 4130 is a carbon and aluminum alloy steel seamless tube for mechanical engineering manufactured in accordance with American Society for Testing and Materials

The production process of galvanized straight seam welded pipe is relatively simple. The main production processes are electric resistance welded straight seam steel pipe (ERW pipe) and submerged arc welded straight seam steel pipe (LSAW pipe). Straight seam pipe has high production efficiency, low cost and rapid development.

The main equipment of ERW pipe mill line includes1. Uncoiler The hot-rolled steel coil is disassembled and sent to the leveling machine. It is divided into two unwinding methods: upper unwinding and lower unwinding.

The offset defect of ERW steel pipe, also called lap welding, refers to the misalignment of the two edges of the tube blank during welding. Even after the internal and external burrs are removed, traces of offset can still be seen on the inner and outer surfaces of the steel pipe.

After the precision bright seamless tube is heat-treated to obtain austenite, it is quenched at a temperature range of 450-600 °C. Or go through 350-600°C at a slow cooling rate after quenching at 650°C. Or after quenching at 650°C, 16Mn seamless steel pipes and 16Mn seamless steel pipes are heated for a long time in the temperature range of 350-650°C, which will cause aging of precision bright tubes.

The cross-rolling process of seamless pipes is a rolling process in which the rolled piece rotates along its own axis, deforms, and advances between two or three rolls with the same rotation direction and intersecting (or inclined) longitudinal axes.