Chemistry key to optimizing use of turnings, borings in electric furnace charge
Feb 01, 2010 | 05:53 AM
| Michael Marley
The use of turnings and borings varies from mill to mill, depending on the melter's experience and preference. But for all mills, chemistry is key.
Some mills might use only a small fraction in their melt, or they'll specify alloy-free turnings in the scrap purchased from outside suppliers. Still others have different ways of buying, storing and charging turnings and borings into their electric-arc furnaces.
There are two different types of briquetting. One is specifically for borings, while the other can be used for combinations of borings and turnings. Hot briquettes are made at Ferrous Processing & Trading Co.'s Zalev yard in Windsor, Ontario. Louis Padnos Iron & Steel Co. also makes both hot and cold briquettes at its facility in Holland, Mich. Many more scrapyards and industrial plants make the cold-pressed briquettes.
Some melters prefer the hot briquette over the colder puck because it has better physical properties, holds together much better and is a more robust product, travels better and doesn't disintegrate and fall apart as easily as the cold briquette. But many of the cold briquettes are made at steel mills and, thus, don't have far to go to the melt shop.
What they give up with the hot briquetting process is some part of the carbon, one scrap buyer said. It is oxidized in the process, so while loose borings typically have a 2- or 2.5-percent carbon content, hot briquettes of borings range from 1.9- to 2-percent carbon. "That's one of the key reasons we melt borings," he said. "We are after the carbon."....
To access AMM's full content, please log in below. If you do not have an AMM account, we invite you to take a free trial or subscribe below.
Already a registered amm.com user?
Access to amm.com editorial content is granted only to paid subscribers and trialists. If you do not have an active account in your own name, please either subscribe or take a trial and you will have instant access to amm.com content. Sharing your login credentials with individuals who are not subscribers represents a violation of AMM copyright.
Every morning, every minute no matter how often you follow the markets, there's an AMM subscription to fit your needs.
Not sure if you are ready to invest in a subscription right now? Take a free, no-obligation trial. Start your free trial today.