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Equipment
Seamless Hot Production Line

Hot Rolling Production Line

Seamless hot production line is used in producing big diameter tubes. Its main process is as following: Billets are inspected and cut to certain length, after centering, heating, piercing, elongating, tubes are sized to finished sizes. Then these tubes go for straightening, testing, cutting, inspection, packing, weighing and finally goes to stock.. Currently, PQF, MPM, ACCU-ROLL is most applied in hot tube production.

 

Rotary Furnace

It’s used to heat billets before piercing. Round furnace bottom is separated from furnace body by sand sealing, oil sealing or water sealing. It is rotated by driving system, with billets rotate together. Thus realize continuous working. There are charging and discharging door on one side of the furnace. With compact structure, small space occupancy, and wide range of temperature appliance, variable material and technics could be applied on this furnace.
 

Two Roller Piercing Machine

Two roller skew / taper type piercing machine, which is used to pierce heated round bars to hollow shells, is the most important deformation process in seamless tube production. Billets are rolled in a circular die which is formed by two rollers, two guide shoes and plug in the middle. Pierced shell goes to next rolling process.

 

 

Elongator

Elongation is main deformation process in seamless tube production. It’s for the purpose of reducing wall thickness of shell into required size of finished pipe, and also eliminate longitudinal unevenness of wall thickness caused during piercing. Besides, it improves inner surface and controls OD and roundness of shell. Currently, there are MPM, plug mill, ACCU-ROLL, among which ACCU-ROLL is the most mature and applied type of technology..

 

Stretch Reducing Mill

Sizing of tube is the last process in seamless tube production, its main purpose is to remove OD deviation caused in previous process, thus finished tube is with higher precision and roundness. Currently, two roller and three roller is the most popular way of sizing.

 

 

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