British Steel Plc.

Trevor Bagshaw

John McCann

Kenneth G Hardwick

Electroslag casting methods and apparatus continuously deposit metal on to the surface of an elongate metal article such as a steel mill roll, supported with its axis substantially vertical with respect to an open ended mould positioned around the surface of the article. A vertically movable platform is adapted to encompass the articles, and carries one or more feed devices for feeding, in the form of a consumable electrode, the metal which is to be deposited onto the surface of the article into the space defined between the sides of the mould and the article. The platform can be driven vertically and means are provided for coupling the mould to the platform after a predetermined vertical movement of the platform.

Methods and apparatus relating to electroslag deposition

A method of applying a hard facing of an iron or steel former (e.g. a roll of a rolling mill) in which a consumable electrode is melted on to the surface of the former by a submerged arc or gas shielding welding process and in which the former and the welding head are moved relative to one another to deposit a bead of weld metal on to the former. The consumable electrode is chosen to give a weld metal deposit comprising by weight, from 0.03% to 0.12% carbon, from 0.20% to 0.75% silicon, from 0.50% to 1.50% manganese, from 4.50% to 6.50% nickel, from 12.0% to 17.0% chromium, from 1.5% to 2.0% molybdenum, from 1.2% to 2.0% copper, from 0.2% to 0.9% niobium, up to 0.04% sulphur, up to 0.04% phosphorus and up to 0.06% nitrogen, the balance being iron and incidental impurities, the ratio of nickel and copper to the carbide forming elements being chosen to achieve a microstructure of between 3% and 10% delta-ferrite in the interdentritic regions thereof.

Welding microstructure control

Methods of hard facing iron or steel articles by a submerged arc welding process are described. Specifically, an iron or steel rolling mill roll arbor is hard faced by rotating the arbor about its longitudinal axis and traversing a welding head parallel to said axis to deposit a spiral bead of weld metal on the arbor for subsequent heat treatment and machining. Different consumable electrodes and fluxes are chosen to deposit a desired hard facing on the arbor.

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Sheffield, United Kingdom

Trevor Bagshaw