摘要:
Nach diesem Verfahren wird eine Verbundwalze (1) mit einem Ballen (2) und Zapfen (3) jeweils unterschiedlicher Werkstoffzusammensetzung durch Umschmelzen einer Elektrode (5) nach dem Elektroschlacke-Umschmelzverfahren in einer Kokille (8) hergestellt. Dabei weist die Elektrode (5) verschiedene Bereiche (6, 7, 9) auf, die den Zapfen (3), dem Ballen (2) und den dazwischen befindlichen Übergangsbereichen (4) der Masse und der gewünschten Werkstoffzusammensetzung nach entsprechen. Der Hohlraum (18) der Kokille (8) weist eine der Verbundwalze (1) entsprechende Kontur mit einem mittleren Bereich (18), verengten Endbereichen (21, 22) und konischen Übergängen (19, 20) zwischen den einzelnen Bereichen auf.
摘要:
In manufacture of composite steel ingot, a consumed electrode 11 is inserted into an empty space concentric with the ingot 10, and electroslag remelting is effected under a slag bath 16 and the molten metal solidifies. Current is taken out through a plurality of collecting electrodes 12 electrically connected to the ingot. To obtain improvement in the uniformity of depth of fusion of the ingot, the flow path of the electric current passing from the consumed electrode to the collecting electrodes is moved in the circumferential direction of the ingot during the electroslag remelting, e.g. by rotating either or both of the ingot and the collecting electrodes. Further improvement may be achieved by varying the speed of movement of this flow path as the slag bath ascends the ingot.
摘要:
In manufacture of composite steel ingot, a consumed electrode 11 is inserted into an empty space concentric with the ingot 10, and electroslag remelting is effected under a slag bath 16 and the molten metal solidifies. Current is taken out through a plurality of collecting electrodes 12 electrically connected to the ingot. To obtain improvement in the uniformity of depth of fusion of the ingot, the flow path of the electric current passing from the consumed electrode to the collecting electrodes is moved in the circumferential direction of the ingot during the electroslag remelting, e.g. by rotating either or both of the ingot and the collecting electrodes. Further improvement may be achieved by varying the speed of movement of this flow path as the slag bath ascends the ingot.
摘要:
Provided is a method of producing maraging steel and a method of making Ti-based inclusions finer and making the sizes of Ti-based inclusions that may differ at different locations in the steel ingot more uniform. A method of producing a maraging steel by using vacuum arc remelting that uses a vacuum arc remelting apparatus at least includes a steel ingot production step of producing a steel ingot by melting a consumable electrode made of maraging steel in a crucible of the apparatus, and in this method, the steel ingot production step includes cooling the steel ingot with rare gas introduced between the steel ingot and the crucible.
摘要:
A method of repairing defect in cast iron workpiece, including: machining the workpiece in the area of the defect to remove the defective material and form a chamber opening at a surface of the workpiece; anchoring a receptacle to the workpiece above the chamber (2), the receptacle is provided with an orifice in communication with the chamber; adding molten iron (4) into the receptacle so that it at least part of it flows into the chamber; adding slagging agent (5) into the receptacle; heating the slagging agent and the molten iron with an electrode (6); adding nodulizing agent into the molten iron so as to segregate graphite; and allowing the molten iron and the workpiece to cool down slowly. The above-described technique also has applicability for connecting two cast iron workpieces (11,12) together.
摘要:
Für die Herstellung von Hohlblöcken (18) werden mindestens zwei Abschmelzelektroden (12) mit einem Durchmesser (D) des mindestens 1,0-fachen der Wandstärke der Hohlblöcke (18) in einer kurzen wassergekühlten, im Bereich der Abschmelzelektroden (12) insbesondere T-förmig erweiterten Kokille (10) abgeschmolzen, wobei durch einen von oben in die Kokille (10) eingebauten Dorn (17) mit einer Konizität von mindestens 1,5 % die Innenwand des Hohlblocks (18) gebildet wird und das Niveau des Schmelzsumpfes (14) unterhalb der T-förmigen Erweiterung (11) der Kokille (10) gehalten wird.