| 摘要 |
The invention concerns an oxygen injection lance orifice for steel-producing electric furnace, comprising a central oxygen-supplying conduit (1) and a cooling fluid circuit (17) enclosing the central conduit (1), the central conduit having a single piece bent end with a proximal portion (2) defining an oxygen supply chamber (3) and a distal end (5) including a housing for a copper injection nozzle (6) directly mounted by being screwed on. The nozzle (6) has a cylindrical body (9) and a threaded tail (10) of smaller diameter, with a tapering shoulder (11) between the body (9) and the tail (10), and the injection nozzle (6) housing is a stage bore comprising successively, from upstream towards downstream relative to the oxygen direction flow, a first tapped portion (14) receiving the injection nozzle (6) threaded tail (10), a tapering shoulder (15) against which the nozzle (6) tapering shoulder (11) rests, and a second portion (16) of larger diameter than the first portion and receiving the nozzle (6) cylindrical body (9).
|
