The present invention provides a composite roll for rolling including an outer layer having excellent wear resistance, surface roughening resistance, crack resistance, and accident resistance due to segregation of MC carbides being suppressed to adjust the amount of graphite to be crystallized. The composite roll for rolling of the present invention is a composite roll for rolling that has an outer layer and is produced through centrifugal casting, and the outer layer contains C in an amount of 2.2 mass % to 3.2 mass %, Si in an amount of 1.0 mass % to 3.0 mass %, Mn in an amount of 0.3 mass % to 2.0 mass %, Ni in an amount of 3.0 mass % to 7.0 mass %, Cr in an amount of 0.5 mass % to 2.5 mass %, Mo in an amount of 1.0 mass % to 3.0 mass %, V in an amount of 2.5 mass % to 5.0 mass %, Nb in an amount of more than 0 mass % and 0.5 mass % or less, and a remaining portion including Fe and inevitable impurities, and a condition (a): Nb mass %/V mass %<0.1, and a condition (b): 2.1C mass %+1.2Si mass %Cr mass %+0.5Mo mass %+(V mass %+Nb mass %/2)13.0 mass % are satisfied.

This application relates to a heat transfer tube, its method of manufacture and its use for thermal cracking hydrocarbon feeds, such as thermal cracking in furnaces. The heat transfer tube comprises a chromium and aluminum carburization-resistant alloy capable of generating a typically continuous aluminum oxide scale under thermal cracking conditions that reduces coking and thereby enhances heat transfer. The carburization-resistant alloy comprises 25.1 to 55.0 wt. % nickel; 18.1 to 23.9 wt. % chromium; 4.1 to 7.0 wt. % aluminum; and iron. Additionally, the carburization-resistant alloy has at least one strengthening mechanism to provide desirable mechanical properties. The carburization-resistant alloy composition is also resistant to the formation of cracks during centrifugal casting.

A method to manufacture a tubular element for transferring abrasive materials such as concrete, inert materials or suchlike, wherein the tubular element comprises an internal tubular component made of chromium carbide or other wear-resistant material, and an internal tubular component in contact with and coaxial to the internal tubular component and made of composite material.

A method to manufacture a tubular element for transferring abrasive materials such as concrete, inert materials or suchlike, wherein the tubular element comprises an internal tubular component made of chromium carbide or other wear-resistant material, and an internal tubular component in contact with and coaxial to the internal tubular component and made of composite material.

A water-cooled centrifugal pipe casting machine includes a sector ladle tilting system, a pouring runner, a pipe mold and a pipe removing device. The pipe mold is provided to a travel system, and rotation of the pipe mold is controlled by a pipe mold rotating system. By using a servo motor driving the sector ladle tilting system, by using a parallel four-bar linkage structure tilting a sector ladle, and by using a variable frequency motor controlling the movements of a rack and a gear of a travel driving system, a constant amount of hot metal flowing out of the sector ladle per unit time can be ensured and a constant traveling speed of the centrifugal pipe casting machine are achieved. As such, uniformity of the wall thickness of the casting pipes can be ensured, the quality thereof can be improved, and materials required can be saved.

A method to make a tubular element to transfer abrasive materials such as concrete, inert materials or suchlike, where the tubular element includes an external tubular component made of steel and an internal tubular component, coaxial to the external tubular component, where the internal tubular component is made of chromium carbide, or other similar material resistant to wear.

An apparatus and a process for producing forged components composed of TiAl alloys, wherein a melt of a TiAl alloy is provided and is cast by horizontal centrifugal casting so as to produce at least one semifinished TiAl cast part and the semifinished TiAl cast part is converted by forging into a forged TiAl part.

A process for making a braking band for a disc of a disc brake for motorcycles provides performing a casting by centrifugal casting of a predefined quantity of cast iron, obtaining a tubular semi-finished product, transversely cutting the tubular semi-finished product, obtaining a plurality of semi-finished bands having a thickness substantially equal to a thickness of the braking band, and cooling the semi-finished bands, obtaining semi-finished bands in spheroidal cast iron or mainly in spheroidal cast iron. The semi-finished bands are subjected to a chip removal process to obtain finished braking bands.

A process for making a braking band for a disc of a disc brake for motorcycles provides performing a casting by centrifugal casting of a predefined quantity of cast iron, obtaining a tubular semi-finished product, transversely cutting the tubular semi-finished product, obtaining a plurality of semi-finished bands having a thickness substantially equal to a thickness of the braking band, and cooling the semi-finished bands, obtaining semi-finished bands in spheroidal cast iron or mainly in spheroidal cast iron. The semi-finished bands are subjected to a chip removal process to obtain finished braking bands.

A molding machine cylinder comprising a lining layer having a structure comprising 20-50% by area of tungsten carbide particles and 1-10% by area of tungsten-based metal carboboride particles in a nickel-based alloy matrix, and containing 1-7.5% by mass of Fe, can be produced by a centrifugal casting method comprising a first step of heating at higher than 1140 C. and lower than 1200 C., and a second step of heating at 1080-1140 C. after melting the raw material powder.