Patent ES-8501802-A1 (ES)
Title: Quenching appts. esp. for thick steel pipes
IPC: C21D9/08
Filed: 1983-08-30
Abstract: EP--86988 A Appts. for quenching a piece of steel includes an exterior quenching system for directing coolant in a circumferential flow pattern at variable flow rates for separate segments along the steel surface. For quenching hollow steel pieces, the appts. includes an interior quenching system for passing coolant through the steel piece and for injecting a gas into the coolant to cause turbulence and facilitate heat transfer from the interior surface of the steel piece to the coolant. - The appts. is esp. useful for quenching steel pipes of large and varying thicknesses, such as upset pipe, casing and tapered steel pieces as well as tool joints after they are welded to a drill pipe. Steel pipe with walls of greater thickness or lower alloy content can be successfully treated. Tool joints and pipes may have a similar compsn. and the tool joint need not have a higher alloy content to withstand temp. changes caused by welding.  (5,8) EPAB- EP--86988 B Appts. for quenching a piece of steel includes an exterior quenching system for directing coolant in a circumferential flow pattern at variable flow rates for separate segments along the steel surface. For quenching hollow steel pieces, the appts. includes an interior quenching system for passing coolant through the steel piece and for injecting a gas into the coolant to cause turbulence and facilitate heat transfer from the interior surface of the steel piece to the coolant. - The appts. is esp. useful for quenching steel pipes of large and varying thicknesses, such as upset pipe, casing and tapered steel pieces as well as tool joints after they are welded to a drill pipe. Steel pipe with walls of greater thickness or lower alloy content can be successfully treated. Tool joints and pipes may have a similar compsn. and the tool joint need not have a higher alloy content to withstand temp. changes caused by welding.  (44pp Dwg.No.5,8) - EP--86988 B An apparatus for quenching a piece of steel in a receptacle adapted to receive the piece of steel of the type comprising a cooling medium source for supplying a cooling medium to the receptacle, said cooling medium source comprising an exterior quenching means, characterised in that said exterior quenching means is in communication with the interior of the receptacle through a plurality of openings in the receptacle and adapted for separately directing a cooling medium in a substantially circumferential flow pattern at variable flow rates around separate exterior segments of the piece of steel as the piece of steel is held in the receptacle, said receptacle being configured to permit sufficient turnover of cooling medium to replenish at least a portion of the cooling medium directed in the circumferential flow pattern once such portion of the cooling medium has removed heat from the piece of steel.  (17pp) USAB- US4575054 A Steel pipes of substantial and varying thicknesses are quenched by an arrangement in which a circumferential flow pattern of coolant is obtained around the exterior of the pipe, the coolant directed not to impinge on the pipe. A number of deflector plates are used to channel the flow in a receptacle for the pipe. The internal quenching arrangement includes means for injecting gas into a coolant fed through a conduit into the pipe and subjected to deflection by vanes to impact a long spiral movement to the coolant. Additional vanes aid in producing turbulence in the coolant.