Process of casing pipe inplant:

Steel ingot heating → hydraulic punching → reheating → extension → periodicrolling → reheating → sizing → cooling → straightening → pipe cutting →inspection

Steel ingot heating: ∮216mm periodic tube rolling mill with a ring furnace, ∮ 318mm periodic tube rolling mill original design with tworingfurnace.
Hydraulic punching: ∮ 216mm is 10kN hydraulic presspunching, ∮ 318mm punching with 18kN hydraulic press.
Extension: Oil casing plants are using tworoller guide extension machine.
Reheating: with a tray furnace, rolling millcycle were used, and then do notuse the heat into the furnace.
Sizing: use the two-roll 5-rack sizingmachine.

Oil casing plant cooling bed is a one-waychain-type cooling bed, ∮ 216mm cyclerolling unit product specifications ∮ 114.3 ~319mm, wall thickness 6 ~ 40mm; ∮318mm cyclerolling unit rolling product specifications ∮ 168~ 377mm, wall thickness 6 ~ 40mm. As oil well pipe, you canproduce a variety ofcasing pipe and some drill pipe.

In order to improve the quality of thecasing pipe body, the casing pipefactory built a set of ∮180mm precisionpiperolling unit jointly designed by China and the United States in 1994 bymeansof introducing technology, joint design and joint manufacturingequipment.Using continuous casting round tube, ring heating furnace heating,perforationof the cone roller piercing, precision rolling mill rolling, 12-rackthree-rollmicro-tension sizing sizing, cooling bed cooling. Formed a world'sonly 1 setsof seamless steelpipe short-flow production lines, and itsproduction process:EAF → furnace refining → vacuum degassing → continuouscasting → heat transfer→ tube heating → perforation → rolling pipe → sizing →cooling tempering(reserved) → online quenching (reserved) → tempering (reserved)→ sizing(reserved) → cooling → straightening → flaw detecting → sawing →cutting head →inspection → rail straight pipe machining.