A method to adjust the drawing action on a bar in a rolling and/or finishing train is provided, as well as an adjustment device associated with the train to implement the method. A metal product is made using the method.

A process of producing a duplex stainless steel tube comprises the steps of: a) producing an ingot or a continuous casted billet of said duplex stainless steel; b) hot extruding the ingot or the billet obtained from step a) into a tube; and c) cold rolling the tube obtained from step b) to a final dimension thereof.
The outer diameter D and the wall thickness t of the cold rolled tube is 50-250 mm respectively is 5-25 mm, and, for the cold rolling step, R and Q are set such that the following formula is satisfied:
Rp0.2target=416.53+113.26.Math.log Q+4.0479.Math.R+2694.9.Math.C %82.750.Math.(log Q).sup.20.04279.Math.R.sup.22.2601.Math.log Q.Math.R+16.9.Math.Cr %+26.1.Math.Mo %+83.6.Math.N %+Z(1)
wherein Rp0.2target is targeted yield strength and is 800-1100 MPa and 0<Q<3.6.

A method for producing hot-rolled, seamless pipes having at least one wall thickening which can be arranged at any positions over the length of the pipe, wherein by means of a multiple-stand mandrel bar rolling mill, the rolls roll a hollow shell on a mandrel bar as an inner tool to a required nominal wall thickness and produce at specified positions over the length of the pipe a required wall thickening on the outer side of the pipe by opening the rolls in the rolling stands. The thickened wall is produced and finish-rolled by two rolling stands that are consecutive as seen in the rolling direction, in which the deviations of the finished contour of the thickening from an ideal circular cross-section are minimised, wherein the rolling stands located upstream are likewise opened as to avoid any contact of the rolls of these rolling stands with the previously produced thickening.

Method for rolling metal products comprising a plurality of sequential rolling passes during which a metal product (P) is rolled. The method comprises a first rolling pass of the metal product (P) to obtain a first intermediate product (P1), a second rolling pass of the first intermediate product (P1) to obtain a second intermediate product (P2), a third rolling pass of the second intermediate product (P2) to obtain a third intermediate product (P3), a fourth rolling pass of the third intermediate product (P3) to obtain a final rolled product (L).

Provided is a rolling roll including: a rolling roll body (112) installed to a rolling mill and used for rolling a material; and a surface treatment part formed on a surface of the rolling roll body (112) and coming into contact with the material, wherein the surface treatment part is formed to have fine concave and convex patterns forming ridges and valleys on a surface thereof, wherein the fine concave and convex patterns are formed such that the roughness skewness, indicating the difference between the height of the ridges and the depth of the valleys, has a negative () value.

A conveyor for transporting a product, the product being preferably in the form of respective articles, in particular articles of the tissue industry, including a means for supporting and guiding an endless conveyor belt, especially one of the type with articulated links, the belt including at least one respective positive stretch, in particular for transporting the product, and preferably a return stretch, if necessary positioned under the respective longitudinal transporting stretch; and means for driving the conveyor belt and including a means for engaging the respective link of the conveyor belt and, more specifically, means which are adapted to engage a rear-facing surface of the respective conveyor belt link, the means for engaging and driving the conveyor belt being adapted to engage a respective longitudinal stretch, preferably rectilinear, of the conveyor belt itself.

A method for determining the stamping quality of profiled bar includes steps of: a) upstream of the rolling stand performing shaping, the initial speed V.sub.A of the starting product is determined and the initial diameter D.sub.A or initial cross-sectional area F.sub.A are determined contactlessly. b) After the rolling stand, the final speed V.sub.E of the end product is measured and the diameter D.sub.E or area F.sub.E of a virtual enveloping shell for the end product is determined contactlessly. c) The diameter D.sub.N of a virtual, round end product is determined contactlessly as D.sub.N=square root of (D.sub.A.sup.2*V.sub.A/V.sub.E) and/or the average cross-sectional area F.sub.NE of the end product (2) is determined contactlessly as F.sub.NE=F.sub.A*V.sub.A/V.sub.E. d1) The characteristic stamping variable PKG is calculated, and the characteristic stamping variable PKG is compared with a pre-set setpoint value PKG.sub.set. A device for carrying out the method is also provided.

A process of producing a duplex stainless steel tube comprises the steps of: a) producing an ingot or a continuous casted billet of said duplex stainless steel; b) hot extruding the ingot or the billet obtained from step a) into a tube; and c) cold rolling the tube obtained from step b) to a final dimension thereof.

The outer diameter D and the wall thickness t of the cold rolled tube is 50-250 mm respectively is 5-25 mm, and, for the cold rolling step, R and Q are set such that the following formula is satisfied:

Rp0.2target=416.53+113.26.Math.log Q+4.0479.Math.R+2694.9.Math.C %82.750.Math.(log Q).sup.20.04279.Math.R.sup.22.2601.Math.log Q.Math.R+16.9.Math.Cr %+26.1.Math.Mo %+83.6.Math.N %+Z(1)

wherein Rp0.2target is targeted yield strength and is 800-1100 MPa and 0<Q<3.6.

A conveyor for transporting a product, the product being preferably in the form of respective articles, in particular articles of the tissue industry, including a means for supporting and guiding an endless conveyor belt, especially one of the type with articulated links, the belt including at least one respective positive stretch, in particular for transporting the product, and preferably a return stretch, if necessary positioned under the respective longitudinal transporting stretch; and means for driving the conveyor belt and including a means for engaging the respective link of the conveyor belt and, more specifically, means which are adapted to engage a rear-facing surface of the respective conveyor belt link, the means for engaging and driving the conveyor belt being adapted to engage a respective longitudinal stretch, preferably rectilinear, of the conveyor belt itself.

Provided is a round billet capable of reducing damage on a piercing plug in a method of producing a seamless metal tube with a Mannesmann process. The round billet (5), for use in a seamless metal tube, to be produced into a seamless metal tube with a Mannesmann process includes a body having a hole (6) formed in an axial direction of the body. The hole (6) includes an aperture (6a) opening at least at one end face of the round billet (5), and a tapered portion (61) continued to the aperture (6a) and having a diameter gradually increasing toward the aperture (6a).