The invention relates to a gas purging element at a metallurgical vessel as well as a corresponding gas supply pipe.

The invention relates to a gas purging element at a metallurgical vessel as well as a corresponding gas supply pipe.

In a continuous casting method for casting an aluminum-deoxidized molten stainless steel 1 by using a continuous casting apparatus 100 in which a long nozzle 3 extending into a tundish 101 is provided at a ladle 2, the molten stainless steel 1 is poured through the long nozzle 3 into the tundish 101, while immersing a spout 3a into the poured molten stainless steel 1, and the molten stainless steel 1 in the tundish 101 is poured into a casting mold 105. A TD powder 5 is sprayed so that the powder covers the surface of the molten stainless steel 1 in the tundish 101, a nitrogen gas is supplied around the molten stainless steel 1, and a calcium-containing material is added to the molten stainless steel 1 in the tundish 101. The surface of the molten stainless steel 1 after casting is ground.

A purifying device for removing impurities from liquid metal present in a vessel includes a baffle including a first surface and a second surface disposed opposite the first surface. A vent channel is formed between the first surface and the second surface, the vent channel having a proximal end and a distal end opposite the proximal end, the vent channel configured to receive a stream of gas at the proximal end and vent at least some of the stream of gas at the distal end. At least one first vent hole is arranged on the first surface and extending into the vent channel, and at least one second vent hole arranged on the second surface and extending into the vent channel. A passage for liquid metal flow is disposed within the baffle, the passage having a proximal surface and a distal surface, where the distal surface is disposed adjacent to the proximal end of the vent channel.

In a continuous casting device 100 for casting a stainless steel billet 3c, a long nozzle 2 extending into a tundish 101 is provided at a ladle 1. A molten stainless steel 3 is poured through the long nozzle 2 into the tundish 101, and a spout 2a of the long nozzle 2 is immersed into the poured molten stainless steel 3. During pouring, an argon gas 4a is supplied around the molten stainless steel 3 in the tundish 101. Further, continuous casting is performed, in which, while immersing the spout 2a of the long nozzle 2 into the molten stainless steel 3 in the tundish 101, the molten stainless steel 3 is poured from the ladle 1 into the tundish 101 and poured from the tundish 101 into a casting mold 105. During casting, a nitrogen gas 4b is supplied instead of the argon gas 4a around the molten stainless steel 3 inside the tundish 101.

A production method of a maraging steel includes: the step of producing, by vacuum melting, a remelt electrode which comprises from 0.2 to 3.0% by mass of Ti and from 0.0025 to 0.0050% by mass of N; and the step of remelting the remelt electrode to produce a steel ingot having an average diameter of 650 mm or more; wherein the resulting maraging steel includes from 0.2 to 3.0% by mass of Ti.

A process for preparing molten metals for casting at a low to zero superheat temperature involves the steps of placing a heat extracting probe into the melt and at the same time vigorous convection is applied to assure nearly uniform cooling of the melt. Then, the heat extraction probe is rapidly removed when a low or zero superheat temperature is reached. Finally, the rapidly cooled melt is quickly transferred to a mold for casting into parts or a shot sleeve for injection into a die cavity. The process may be carried out so as that small amounts of solid form in part of the melt. In this case, a key aspect of the invention is to carry out the process rapidly in order to maintain the particles in a fine, dispersed state that will not impede flow and will improve the quality of the metal parts produced. Cost of the metal parts produced is lowered due to longer die life and shorter cycle time.

Ultrasonic probes containing a plurality of gas delivery channels are disclosed, as well as ultrasonic probes containing recessed areas near the tip of the probe. Ultrasonic devices containing these probes, and methods for molten metal degassing using these ultrasonic devices, also are disclosed.

In an electric arc furnace system for making steel, a method and structure (1) for eliminating teeming hang-ups and ensuring temperature homogeneity in a ladle which teems into an ingot mold by gas purging at all possible steps under both atmospheric and vacuum conditions, and (2) for preventing non-metallic inclusions from appearing in the final product by deflecting the granular material in the teeming ladle well block away from the ingot mold by a heat resistant but combustible deflector just prior to entry of the teeming stream into the ingot mold.

A method for treating molten aluminum as it passes between a melting furnace and a casting apparatus. The method includes monitoring hydrogen concentration in the molten aluminum; correlating an inert gas concentration usage with the hydrogen concentration; and automatically adjusting the inert gas output from a degasser and the rotor rpm of the degasser to yield a consistent and desired hydrogen concentration for the molten aluminum entering the casting apparatus.