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 roll for continuous casting comprises a cylindrical roll rotatably mounted on a fixed axle and said axle comprising a coolant inlet system and a coolant outlet system. A cooling chamber receives a flow of coolant. The coolant chamber is defined by the space between the interior of the cylindrical roll and the axle. At least one spiral is formed onto the axle that creates a helical flow path from the coolant inlet system to the coolant outlet system.

Apparatus and methods for casting a metal strip with a cross sectional form which varies along the length of the strip. One embodiment of the apparatus includes opposing cooling systems, a positionable molten metal feed system between the opposing cooling systems, and a form adjustment system. The form adjustment system may include at least one dam to determine, at least in part, the cross sectional form of a molten metal feed to the opposing cooling systems. In this way, it is possible to determine the cross sectional form of the solidified metal strip. The dam is moveable during operation of the apparatus to vary the cross sectional form of the molten metal feed to the opposing cooling systems.

Provided are a method of manufacturing an aluminum-zinc-based alloy sheet using twin-roll casting and an aluminum-zinc-based alloy sheet manufactured thereby. Specifically, a method of manufacturing an aluminum-zinc-based alloy sheet, including preparing a melt by melting elements corresponding to an aluminum alloy including 0.5 wt % to 10 wt % of zinc, inevitable impurities and aluminum as a balance (step 1); and twin-roll casting by introducing the melt prepared in step 1 between a pair of rotating cooling rolls (step 2), and an aluminum-zinc-based alloy sheet manufactured thereby are provided. The present invention may manufacture an aluminum-zinc-based alloy sheet, in which twin-roll casting is known to be difficult due to a wide solid-liquid coexistence region, by twin-roll casting by using cooling rolls having high thermal conductivity and controlling a reduction force by the rotational speed of the rolls.

A method for producing a cast strip of molten metal, in which the molten metal passes through a casting gap defined by two oppositely rotating casting rollers and is shaped into the cast strip, as well as the cast strip that is produced. By providing the cast strip in the casting gap with a different thickness in a first length section extending in the longitudinal direction of the cast strip than in a second length section bordering thereon, a metal strip is produced that has length sections with different thicknesses.

An austenitic stainless steel having excellent orange peel resistance and a method for producing the same are disclosed. In the austenitic stainless steel having excellent orange peel resistance, according to an embodiment of the present disclosure, a ratio Gs/Gi of an average crystal grain size Gs of surface crystal grains included in a first area corresponding to a depth of 10% or less of a total thickness of the austenitic stainless steel from the surface of the austenitic stainless steel with respect to an average crystal grain size Gi of internal crystal grains included in a second area corresponding to a depth that is deeper than 10% of the total thickness of the austenitic stainless steel from the surface of the austenitic stainless steel may be 0.5 or smaller. Therefore, it is possible to prevent deterioration of surface roughness due to orange peel of the steel surface even after post-processing of the austenitic stainless steel while increasing the sizes of crystal grains in order to reduce strength of the austenitic stainless steel, and also to reduce cost by replacing copper pipes

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).

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.

In one embodiment, a lead strip caster for battery grids includes a nozzle, a pair of rollers, and a molten lead supply to the nozzle. The lead strip caster produces a continuous lead strip for making battery grids. The nozzle has at least one passage that communicates with generally opposed faces of the nozzle at least partially received between the rollers to supply molten lead to exterior surfaces of the corotating rollers to form a continuous solid strip of lead from which battery grids may be made.

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.