Hardfacing alloy, methods, and products

A method of prolonging the life of an industrial product having one or more components with surfaces subjected to abrasive wear of the order of silicious particles comprising,

• preheating the one or more components,
• welding to the surface of the one or more components a layer of a hardfacing alloy consisting of about 0.65 to about 1.1 percent carbon, about 4.5 to about 10.5 percent chromium, about 0.05 to about 1.0 percent molybdenum, and the balance iron, including impurities as trace elements,
• the alloy having a hardness of from about 48 Rc (455 BHN) to about 52 Rc (512 BHN),
• cooling down the one or more components to which the layer of hardfacing alloy has been welded,
• the preheating and cooling down effective to structurally transform Austenite to Martensite thereby providing a hardfaced surface to the one or more components free of cracks.

A method of prolonging the life of a tool joint connecting together drill pipe, the tool joint having a connectable threaded box having an outer cylindrical portion and an inner connecting pin and an outer cylindrical portion adjacent thereto, comprising,

• preheating at least one of the outer cylindrical portion of the box or of the pin or both to a temperature of about 100° C. to about 400° C.,
• welding a layer of abrasive resistant hardfacing alloy to the outer cylindrical portion of one or both of the box and pin while at the preheating temperature of about 100° C. to about 400°,
• the hardfacing alloy consisting of about 0.65 to about 1.1 percent carbon, about 4.5 to about 10.5 percent chromium, about 0.05 to about 1.0 percent molybdenum, and the balance iron, including impurities as trace elements,
• the alloy having a hardness of from about 48 Rc (455 BHN) to about 52 Rc (512 BHN), and
• cooling down the outer cylindrical portion to which the layer of hardfacing alloy has been welded to one or both of the box or pin effective to structurally transform Austenite to Martensite in the layer of hardfacing alloy thereby providing a hardfaced surface resistant to abrasive wear of silicious materials.