The invention provides an Fe-based amorphous alloy ribbon having a thickness of from 10 m to 30 m, in which a roughness curve of a central part in a ribbon width direction of the free solidified surface satisfies Rp3.0, Rv3.0, 7Pn30, 7Vn30, 0.9(V.sub.A/P.sub.A)<1.4, and the like, the roughness curve being measured according to JIS B 0601: 2013 by applying 20 mm in a ribbon length direction as a reference length and taking 0.8 mm as a cut-off value. Rp represents a maximum profile peak height (m), Rv represents a maximum profile valley depth (m), Pn represents a number of profile peaks having a height of from 0.5 m to 3.0 m, Vn represents a number of profile valleys having a depth of from 0.5 m to 3.0 m, P.sub.A represents an average of heights of five profile peaks from a highest profile peak to a fifth highest profile peak, and V.sub.A represents an average of depths of five profile valleys from a deepest profile valley to a fifth deepest profile valley.

A method for producing an Fe-based nanocrystalline alloy ribbon, the method including a step of supplying a molten Fe-based alloy onto a rotating chill roll, and rapidly solidifying the molten Fe-based alloy that has been supplied onto the chill roll, thereby obtaining an Fe-based amorphous alloy ribbon having a free solidified surface and a roll contact surface, and a step of heat-treating the Fe-based amorphous alloy ribbon, thereby obtaining an Fe-based nanocrystalline alloy ribbon; wherein an outer peripheral part of the chill roll is composed of a Cu alloy, and a thermal conductivity of the outer peripheral part is from 70 W/(m.Math.K) to 225 W/(m.Math.K).

An Fe-based amorphous alloy ribbon reduced in iron loss, less deformed, and highly productive in a condition of a magnetic flux density of 1.45 T is provided. One aspect of the present disclosure provides an Fe-based amorphous alloy ribbon having first and second surfaces, and is provided with continuous linear laser irradiation marks on at least the first surface. Each linear laser irradiation mark is formed along a direction orthogonal to a casting direction of the Fe-based amorphous alloy ribbon, and has unevenness on its surface. When the unevenness is evaluated in the casting direction, a height difference HL?width WA calculated from the height difference HL between a highest point and a lowest point in a thickness direction of the Fe-based amorphous alloy ribbon and the width WA which is a length of the linear irradiation mark on the first surface is 6.0 to 180 ?m.sup.2.

A method of making an apparatus for continuously casting a lead alloy strip includes providing a drum having an aluminum outer circumferential casting surface. The outer circumferential casting surface of the drum is abraded with an angular abrading medium to wear away material from the aluminum outer circumferential casting surface of the drum and to create a coarse, irregular, and non-smooth abraded casting surface configured to reduce the rate of heat transfer and slow cooling of the lead alloy strip cast on the abraded casting surface.

The present invention achieves an object of continuously supplying a melt from a melt nozzle over a long period of time by adjusting the contents of Mn and S in an FeBSiC-type amorphous alloy ribbon. An amorphous alloy ribbon of the present invention includes a composition containing Fe, Si, B, C, Mn, S, and inevitable impurities, the composition containing, with respect to 100.0 atm % of the total amount of Fe, Si, B, and C, 3.0 atm % or more and 10.0 atm % or less of Si, 10.0 atm % or more and 15.0 atm % or less of B, and 0.2 atm % or more and 0.4 atm % or less of C, the amorphous alloy ribbon having a content ratio of Mn of more than 0.12 mass % and less than 0.15 mass %, and a content ratio of S of 0.0036 mass % or more and less than 0.0045 mass %, the amorphous alloy ribbon having a thickness of 10 m or more and 40 m or less, and a width of 100 mm or more and 300 mm or less.

An ultrafine-crystalline alloy ribbon having a composition represented by the general formula of Fe.sub.100-x-y-zA.sub.xB.sub.yX.sub.z, wherein A is Cu and/or Au, X is at least one element selected from the group consisting of Si, S, C, P, Al, Ge, Ga and Be, and x, y and z are numbers meeting the conditions of 0<x5, 8y22, 0z10, and x+y+z25 by atomic %, and a structure in which ultrafine crystal grains having an average particle size of 30 nm or less being dispersed in a proportion of more than 0% and less than 30% by volume in an amorphous matrix; an ultrafine crystal grains-depleted region comprising ultrafine crystal grains at a number density of less than 500/m.sup.2 being formed in a region of 0.2 mm in width from each side of the ribbon.

A single roll type apparatus manufactures a metal thin strip by injecting a molten metal onto a cooling roll outer peripheral face solidifying it to manufacture the strip. An airflow blocking device for blocking the airflow along the cooling roll surface is at a molten metal injection nozzle upstream side for injecting the molten metal in the cooling roll rotation direction, and a carbon dioxide gas injection nozzle for forming a carbon dioxide flow on the cooling roll outer peripheral surface between the airflow blocking device and molten metal injection nozzle or forming a carbon dioxide atmosphere on the cooling roll surface between the airflow blocking device and the molten metal injection nozzle is disposed, and a foreign material removal device for removing foreign material attached to the cooling roll surface is disposed at an upstream side of the airflow blocking device in the rotation direction of the cooling roll.

Provided is a method that includes ejecting an FeSiB-based molten alloy containing iron (Fe), boron (B), and silicon (Si) as essential components from a tapping nozzle to a surface of a cooling roll and rotating the cooling roll at a surface speed of 15 m/sec or more and 50 m/sec or less to rapidly cool the FeSiB-based molten alloy on the surface of the cooling roll to manufacture an alloy ribbon, the tapping nozzle includes a single slit formed to have a width of 0.6 mm or more and less than 2.0 mm, the cooling roll has a curvature of 810.sup.4 or more and less than 210.sup.3, and the method includes passing cooling water in an amount of 0.3 m.sup.3/min or more and less than 20 m.sup.3/min at 5 C. or more and less than 60 C. through the cooling roll to manufacture a rapidly solidified alloy ribbon having an average thickness of 30 m or more and less than 55 m.

A molten metal processing device including an assembly mounted on the casting wheel, including at least one vibrational energy source which supplies vibrational energy to molten metal cast in the casting wheel while the molten metal in the casting wheel is cooled, and a support device holding the vibrational energy source. An associated method for forming a metal product which provides molten metal into a containment structure included as a part of a casting mill, cools the molten metal in the containment structure, and couples vibrational energy into the molten metal in the containment structure.

The invention relates to a method for producing a strand from a monotectic alloy which is made of multiple constituents and in which drops of a primary phase are distributed in a uniform manner in a crystalline matrix in the solidified state. The uniform distribution can be achieved during the production process using the following method steps: a) melting the alloy constituents which consist of at least one matrix component and components that form the primary phase and heating the constituents to a temperature at which a single homogeneous phase exists; b) transporting the melt (2) in the form of strands in a transport direction which is inclined towards the horizontal at a transport speed; c) cooling the melt (2) while transporting the strand lower face perpendicularly to the transport direction in order to form a crystallization front when transporting in a cooling zone; d) setting the cooling intensity, the inclination of the transport direction, and the transport speed such that a horizontal crystallization front is formed and the Marangoni force produced by cooling and forming the primary phase in the form of drops is oriented anti-parallel to the gravitational force such that the drops of the primary phase in the matrix component move in the direction of the gravitational force; and e) drawing the alloy which has been solidified into the strand (9) out of the cooling zone.