News

17 Mar 2008

EZTM JSC and TISCO, China have entered into a contract to supply 350-8 cold rolling tube mill. The 350-8 cold rolling pilger mill is designed to produce cold rolled tubes made of different steel grades with an ultimate strength of material in initial state up to 1000 MPa.

The mill has butt end load of billet fed into the deformation zone with its external surface. The mill is available in both left-hand and fight-hand version.

Tubes are rolled with the use of passes with grooves of a variable section on a tapered or shaped mandrel axially fixed. The passes perform reciprocating movements.

As rolls move to extremes positions the tube and the billet do not contact with passes grooves. The billet is fed and turned in the extreme back and front positions of a stand.

The 3-high working stand is designed to produce high quality tubes of cylindrical section. Variation of wall thickness is reduced. The stand consists of a forced movable housing which takes rolling forces and positions passes and a movable cassette with working rolls.

Specification

Billet
Max outer diameter, up to, mm	360
Wall thickness, mm	5-40
Length, m	2,5-8
Finished tube
Wall thickness, mm	3-32
Outer diameter, mm	140-325
Max length, mm	25
General parameters
Rolling speed, 1-6 sizes, up to, stroke/min	30
Main drive motor power, up to, kW	1500
Output (depends on rolling schedule and finished tube requirements), m/h	25 – 190

It takes 18 months to design and supply the mill under the contract. The mill is scheduled to be commissioned at the end of 2009.

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