![]() Heat time is also a function of ingot prep and availability so most of the time factors beyond the melt shop control the production rate. Shortest heat time I can recall is about four hours but that is really pushing it with everything falling into place. That is probably why mixers went out of favor since they learned to compensate during the refining of the iron to steel. The melt process can take as long as 16 hours dependent on firing rates and initial chemistry so there is time to adjust to any changes needed in the heat. Hopefully he hits the hole with most of the molten metal. the second hook engages the lift pin and lifts the back of the ladle so it pivots on the two hooks it is hanging from. The pouring spout is located as close to the charge window as possible. On the back bottom of the ladle is a pair of triangular plates with a horizontal pin that another hook on the crane can engage to tilt the ladle. They engage two round extension pins with a flange 180 degrees apart on the sides of the ladle. The ladle is taken by overhead crane with a spreader that has two big hooks with basically an I beam between them and a sheave over each hook with about twenty to thirty wraps of a cable up to a pair of drums to wrap it up that are driven together on the crane bridge. I know that by the time I started my career in the late 60's they weren't used. to use blasts of air or oxygen :in an open-hearth furnace for essentially the full time :from hot metal addition to tap, to materially. I'm pretty sure that the plant at which I worked didn't use a mixer.Īnybody who worked open hearths in the 40's is going to be well up in years at this point and I suspect that if mixers were still in use then that the demands of WW2 pretty much dictated that anything pourable was consumed asap for the war effort. The information that I did have was supplemented by referring to my copy of The Making, Shaping and Treating of Steel, which does mention the transfer of hot metal from the mixer to the furnace by ladle. In summary: blast furnace to torpedo cars via floor runners, torpedo car to ladle, ladle to mixer, mixer to ladle, ladle to open hearth, then open hearth to ladle, ladle to moulds. The second example seems to be the most efficient, as the ladle pit, if properly placed, could also be used to receive hot metal from the mixer, for transfer to the furnace. In the first case, the mixer would need to be positioned lower than the track for the torpedo cars, whereas in the second scenario, the mixer could be placed at any reasonable height, with a pit provided for ladle placement for filling from the torpedo car. However, common sense would suggest that the torpedo cars would either be emptied directly into the mixer, or they would empty into a ladle, which would then transfer the iron to the mixer. I had never heard of the mixer, and I'm uncertain if the plant where I worked used one. The percentage of carbon maintained by adding the required amount of spiegeleisen, which is an alloy of iron and used in the manufacture of steel.Your question shows how little I know of the open hearth process, although, in my defence, I never worked in that area. The heat required for the process is obtained by burning heated producer gas by regeneration of heat economy depending upon the impurities the lining of hearth is acidic or basic lining. The percentage of carbon is decreased by adding scrap iron. The impurities present in cast iron are removed by hematite. The metallurgy process of iron by using the principle of open hearth process as follows, Open hearth process is also known as Siemens-Martin process. ![]() The process developed from the old processes which are using the waste heat given off the furnace, directing the fumes from the furnace through a brick work. ![]() Siemens-Martin process is a steel making technique that for the major part of all steel made in the world. The Metallurgy and isolation should be such that it is commercially feasible and chemically feasible. Hint: This is a process of metallurgy during manufacturing of steel.
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