Any documentaries on how do steel mills accurately control the chemical composition of the metal? It seems to me that some alloy steels require quite an accurate amount of componentsThis process is never shown in detail, you just see scrap metal put into he furnace and steel comes out. How do they eliminate impurities and unwanted elements of the scrap?
bump for interest in this.sounds like a overlap of chemical and mechanical engineering a solution....hope some anon could shed light on this.ik for semiconductor and other wafer products they either dope via adding pure elements to the initial stuff in the crucible, or the add it in via a gas.
If the videos I watch on youtube are any indication the most important factors are speaking poo, wearing flip flops around 3000 degree steel and using the dirtiest brake drums you can find
>>2883453They melt, take samples, there's a machine that tells how much of X thing to put in and they repeat this process until it's up to spec.
First result of searching steel mill composition testinghttps://www.youtube.com/watch?v=ou9vNsVhk8MImpurities usually float on the top as slag, to change composition/properties other metals can be added to the molten metal
>>2883462Also https://www.youtube.com/watch?v=ACSfkNFHlmM
>>2883453>accurately
>>2883453I've never seen details, either. Just the engineers pouring sample coupons and subjecting them to chemical and mechanical analysis, then doping the rest of the melt. Best bet is hit a local college library and grab an engineering book. I had to figure something out on steel composition, years ago and that's what i did.
>>2883453>Any documentaries on how do steel mills accurately control the chemical composition of the metal?Those disgusting Pakistani poos in your image don't accurately control any part of the chemical composition of the metal. That's why most of the stuff they make is dogshit quality.
>>2883462I understand that oxygen is injected into the molten mass with a lance and it oxidizes impurities such as sulphur, silica and carbon which float on the top. But how do you remove metals? What if there are copper or aluminium dissolved in the iron in the crucible?
>>2883588Aluminum separates by oxidizing and floating on top. Copper is a hard impurity to get rid of and it does diminish the quality of the steel. Most of it is probably removed with mechanical separation before the melt. Probably the most used tool to measure composition is an x-ray fluorescence machine.
>>2883453They use a neutron source to get a spectra of the composition of the melt and add what they need.
>>2883453depends on the method they use to make steel. In the most common method the LD method the raw iron is put into a converter. pure oxygen is blown into the iron and manganese and other helpers are added, oxidising all impurities and turning them into slag which can be skimmed off. after that alloying elements are added to bring the mix to spec. methods differ depending on the method for steel production, siemens-martin hearth, electric arc furnace, powder metalurgic etc. but the basic principle is the same, make raw iron, burn everything out that isn't iron from the raw iron, add allying elements and set the carbon content to make steel.
They don't.
>>2883453My experience is only with smaller foundries running induction furnaces with the biggest being 1 ton, but we would take samples and analyze them using an OES. If its calibrated right with the correct standards it will give you compositional data down to 100ppm or more for fancier machines. A big component of making clean steel is good control on the incoming scrap composition.>>2883588Depends on the metal. Readily oxidized stuff like aluminum and chrome will bind with dissolved oxygen and go to slag. Stuff like copper is a tramp element since it oxidizes less readily than iron, so the only real solution is making sure you aren't adding too much in the scrap, or diluting with iron if you've got to much in the melt.
>>2883531are their setups based though?
>>2886711>are their setups based though?no because they dont seek to optimize or improve despite the information to do so being accessible out there. theyre content to do shit grade work without regard. notice how they all have smartphones but dont have shoes. they lack even the most basic level critical thinking to prioritize their wellbeing
>>2886711>are their setups based though?Some of the shit they do and the setups they have are pretty impressive... NGL. >>2886927>no because they dont seek to optimize or improve despite the information to do so being accessible out there. theyre content to do shit grade work without regard. notice how they all have smartphones but dont have shoes. they lack even the most basic level critical thinking to prioritize their wellbeingBut also this. They could streamline shit a lot more and make their lives easier and safer if they really wanted to. It's weird, How do they know how to make some of the things they do and get all tooled up for it and actually have pretty decent skills, and then just completely fuck up basic stuff like having a conveyor move stuff around rather than throwing it on the ground for the next poo to have to pick up and re-load into a wheelbarrow to transport it to the next guy where he promptly dumps it back onto the ground. It's fucking ridiculous.
>>2886928>How do they know how to make some of the things they do and get all tooled up for ita lot of that is carry over from the time of the british occupation. you can see the remains of 1st world technology abandoned and left behind. the new machines they have are poor copies of old british stuff. the factories they have make ripoff parts for western equipment. the only new shit they have is chinkshit and they can bare keep it going
>>2886927smartphone is the new opiumthey don't believe in shoesthey're just workers the boss would fuck their shit up if they messed with anything and it made things worse
>>2883453do they actually have this huge furnace type shit in the middle of this building what is it called
>>2886936>they don't believe in shoesI have seen a few guys in some of the videos with honest to god work boots on. Some even have what appear to be safety glasses. Maybe they're evolving.
>>2886943just trendy zillenials eroding the centuries old tradition
>>2883599When my godfather still was alive I visited the steel plant he worked at. It was very interesting, unfortunately I have forgotten quite a lot of the details of the process. I happened to ask how they can manage the composition of the steel if there is too much of something, and he said that they dilute it. Add more scrap steel and measure again.They happened to melt a batch when I was there. 50 MW electrodes put a shitton of current trough the crucible of scrap. Definitely worth visiting.
