Welding microstructure control

US4143258A · kind A · utility

Assignee

• British Steel Corporation

Inventors

• John McCann · Belmont, US
• Trevor Bagshaw · Sheffield, GB

Key dates

• Filing date: Feb 17, 1977
• Grant date: Mar 6, 1979
• Expiry date: Feb 17, 1997

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K35/3086
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

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.