Described herein are thin metal strips having hot rolled exterior side surfaces characterized as being primarily or substantially free of all prior austenite grain boundaries, or at least primarily or substantially free of all prior austenite grain boundaries, and including elongated surface structure. As a result, because the prior austenite grain boundaries are not primarily or substantially present, all such prior austenite grain boundaries are not susceptible to grain boundary etching due to acid etching or pickling. In particular examples, the thin metal strips undergo hot rolling performed with a coefficient of friction equal to or greater than 0.20 with or without use of lubrication.

A continuous casting and rolling apparatus includes: a continuous casting device; a cutting device that is disposed at the output side of the continuous casting device and cuts an inner slab produced from the continuous casting device; a rolling device pressing down on the slab and disposed downstream of the continuous casting device in the moving direction of the inner slab; a tunnel furnace which is disposed between the cutting device and the rolling device and heats the slab disposed on the main path of the inner slab that is transferred from the continuous casting device to the rolling device; and a loading adjustment unit which is disposed adjacent to the tunnel furnace and unloads the slab from the main path from the outlet side of the tunnel furnace and loads the slab onto the main path from the inlet side of the tunnel furnace.

A method for manufacturing a ring-rolled product forms the ring-rolled product from a ring material by using a mandrel roll and a main roll. The mandrel roll and the main roll are configured so as to contact inner and outer circumferential surfaces of the ring material, respectively, and are configured so as to press the ring material in a radial direction thereof in a state in which the ring material is rotated in a circumferential direction thereof. The method includes a step of rolling the ring material that includes an operation of induction-heating the main roll by at least one induction heating element and rolling the ring material between the mandrel roll and the main roll, which is induction-heated.

A process for producing metallurgical products, in particular at least of the merchant type, in which there are provided the steps of: a) producing a long casting product by means of a continuous casting machine; b) rolling said long casting product by means of a rolling mill comprising a plurality of rolling stand groups; wherein during step b), said long casting product is heated by first heating means exclusively arranged between one pair of consecutive rolling stand groups; wherein said first heating means are the only heating means between the rolling stand groups of the rolling mill; and an apparatus adapted to perform the aforesaid process.

A rolling mill facility includes: a support part extending along a plate width direction of a steel plate to be rolled; a thickness measurement part supported by the support part and configured to measure a thickness of the steel plate; and a heating part supported by the support part at positions at both sides across the thickness measurement part in the plate width direction and configured to heat both edge portions of the steel plate.

In a tandem type cold rolling mill of a circulating oil-feeding system for continuously rolling a steel sheet by feeding a coolant serving as a rolling oil and a cooling water to each stand, an edge heater for heating both edge portions of the steel sheet to not lower than 60 C. as a steel sheet temperature at an entry side of a roll bite is arranged at an upstream side of the first stand in the cold rolling mill and a device for jetting a coolant having a concentration higher than that of the coolant fed to the firsts stand onto surfaces of both edge portions of the steel sheet is arranged between the edge heater and the first stand. The cold rolling mill can be used to roll a hard-to-roll material such as silicon or stainless steel sheet without causing an edge crack or sheet breakage in low-speed rolling.

An apparatus (1) for increasing the temperature of elongate metallic rolled stock (2), having a heating unit (3) which comprises induction heating elements (4, 5, 6, 7; 104, 105, 106, 107) for heating the rolled stock (2) along a heating zone (8), and having a conveying device (15) which comprises driving and/or roller table roller elements (27, 28) as active or passive conveying elements (18) for moving the rolled stock (2) along the longitudinal extension (9) of the heating zone (8), wherein the induction heating elements (4, 5, 6, 7; 104, 105, 106, 107) are arranged spaced apart from one another in the longitudinal extension (9) of the heating zone (8) in each case by a free space (10, 11, 12), and wherein a sliding deflector element (34, 35, 36, 37, 38, 39, 40, 41, 73) and/or opposing lateral guide elements (60, 61) are arranged in each of the free spaces (10, 11, 12) in order to prevent the conveyed rolled stock (2) from coming into contact with the induction heating elements (4, 5, 6, 7; 104, 105, 106, 107).

In a decision control device of a control system, a predetermined pass schedule is decided by adjusting the rolling force per unit width at a last stand of a hot finishing tandem rolling mill to cause the edge profile on the outlet side of the last stand to fall within an allowable range based on the relationship between a strip crown and the edge profile on the outlet side of the last stand with respect to the rolling force per unit width and a strip shape control parameter, obtained regarding the last stand, and adjusting the strip shape control parameter of the last stand to cause the strip shape on the outlet side of the last stand to fall within an allowable range and cause the strip crown to become a predetermined value or smaller.

An apparatus line for manufacturing seamless steel pipes and tubes includes: a heating apparatus for heating a steel raw material; a piercing apparatus for piercing the heated steel raw material thus forming a hollow material; and a rolling apparatus for applying working to the hollow material to form a seamless steel pipe having a predetermined shape. A cooling apparatus is arranged on an exit side of the rolling apparatus. A heated steel raw material is worked by the rolling apparatus after being pierced by the piercing apparatus, and thereafter, using a surface temperature of a hollow piece before being cooled by the cooling apparatus as a cooling start temperature, the hollow piece is cooled to a cooling stop temperature differing by 50 C. or more from the cooling start temperature and being equal to or above 600 C. at an average cooling speed of 1.0 C./s or more in terms of an outer surface temperature.

A combined continuous casting and endless rolling plant for a metal strip, comprisinga continuous casting line (1) for casting a slab;a first rolling mill (6) for roughing the slab and for obtaining a transfer bar;a second rolling mill (11) for finishing the transfer bar and for obtaining a strip;a third rolling mill (18), comprising at least two rolling stands (17), for further reducing the N thickness of the strip;accumulation means (20) of the strip comprising at least one first reel (37, 37) dimensioned to wind and unwind a coil weighing from 80 to 250 metric tons and/or up to 6 meters in diameter, named mega coil;first cutting means (13), arranged between said third rolling mill (18) and said accumulation means (20), configured to cut the strip after the mega coil has been wound on the at least one first reel (37, 37);at least one second reel (48) for winding portions of strip, unwound from said accumulation means (20), up to a predetermined weight limit or coil diameter limit;second cutting means (47), arranged between said accumulation means (20) and said at least one second reel (48), adapted to cut the strip whenever a portion of strip wound on the at least one second reel (48) reaches said predetermined weight limit or coil diameter limit.