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This table provides a detailed overview of companies in the United States that process iron and steel slag, categorizing the types of slag handled and the locations of processing plants. It identifies the specific steel companies serviced by each processor and distinguishes between various slag and furnace types, such as air-cooled, granulated blast furnace slag, pelletized slag, and slags from basic oxygen, open hearth, and electric arc furnaces. This data is economically and industrially significant because slag processing supports the steel industry's sustainability by recycling byproducts into valuable materials used in cement, construction, and other sectors, thereby reducing waste and promoting resource efficiency.
Analysis of the 2021 data reveals a broad geographic distribution of slag processors, with a concentration in states like Ohio, Indiana, Pennsylvania, and Illinois, reflecting the historical steel production hubs. Notably, companies such as ArcelorMittal USA, Nucor Corp., and United States Steel Corp. are frequently serviced, indicating their substantial role in supplying slag for processing. The electric arc furnace (EAF) slag type is the most commonly processed, with numerous facilities across multiple states handling this slag, highlighting the growing importance of electric arc furnace steelmaking in the U.S. Conversely, air-cooled and granulated blast furnace slags are also widely processed, with several companies like LafargeHolcim Ltd. and Lehigh Hanson, Inc. specializing in grinding granulated slag for cement applications. The presence of processors servicing old slag pile sites, such as BDM Warren Recycling LLC and LoMc LLC, underscores ongoing efforts to reclaim and repurpose legacy slag deposits. Overall, the data reflects a dynamic and diversified slag processing industry integral to the U.S. steel and construction sectors.
| TABLE 4 | ||||||||||||||||
| PROCESSORS OF IRON AND STEEL SLAG IN THE UNITED STATES IN 20211 | ||||||||||||||||
| Slag and furnace types2 | ||||||||||||||||
| Blast furnace slag | Steel furnace slag | |||||||||||||||
| Slag-processing company | Plant location | Steel company serviced3, 4 | AC | GBFS | PEL | BOF | OHF | EAF | ||||||||
| Argos USA Corp. | Tampa, FL | Foreign | X | |||||||||||||
| Ash Grove Cement Co. | Portland, OR | do. | X | |||||||||||||
| Barfield Enterprises, Inc. | LaPlace, LA | Bayou Steel Group | X | |||||||||||||
| BDM Warren Recycling LLC | Warren, OH | Slag pile (former RG Steel LLC) | X | X | ||||||||||||
| Beaver Valley Slag, Inc. | Aliquippa, PA | Old slag pile site | X | X | X | |||||||||||
| Beelman Truck Co. | Granite City, IL5 | United States Steel Corp. | X | |||||||||||||
| Beemsterboer Slag Corp. | Gary, IN | do. | X | X | ||||||||||||
| Blackheart Slag, LLC | Muscatine (Montpelier), IA | SSAB Americas | X | |||||||||||||
| CEMEX, Inc. | Miami, FL | Foreign | X | |||||||||||||
| Commercial Metals Co. | Jacksonville, FL | CMC Steel Florida | X | |||||||||||||
| Diproinduca (USA) Ltd. | Sparrows Point, MD | Slag pile (former RG Steel LLC) | X | |||||||||||||
| Dragon Products Co., Inc. | Thomaston, ME | Domestic and foreign | X | |||||||||||||
| Edw. C. Levy Co. | Butler, IN | Steel Dynamics, Inc. | X | |||||||||||||
| Do. | Burns Harbor, IN | ArcelorMittal USA | X | |||||||||||||
| Do. | Columbia City, IN | Steel Dynamics, Inc. | X | |||||||||||||
| Do. | Crawfordsville, IN | Nucor Corp. | X | |||||||||||||
| Do. | Brandenburg, KY | NA | ||||||||||||||
| Do. | Detroit (Dearborn), MI | AK Steel Corp. | X | X | ||||||||||||
| Do. | Detroit (Ecorse), MI | United States Steel Corp. | X | X | ||||||||||||
| Do. | Columbus, MS | Steel Dynamics, Inc. | X | |||||||||||||
| Do. | Canton, OH | The Timken Co. | X | |||||||||||||
| Do. | Delta, OH | North Star BlueScope Steel Ltd. | X | |||||||||||||
| Do. | Huger, SC | Nucor Corp. | X | |||||||||||||
| Do. | Memphis, TN | do. | X | |||||||||||||
| Do. | Sinton, TX | NA | ||||||||||||||
| Do. | Seattle, WA | do. | X | |||||||||||||
| Fritz Enterprises, Inc. | Fairfield, AL | United States Steel Corp. | X | X | ||||||||||||
| Harsco Metals & Minerals | Newport, AR | Arkansas Steel Associates, LLC | X | |||||||||||||
| Do. | Pueblo, CO | NA | X | |||||||||||||
| Do. | Wilton (Muscatine), IA | SSAB Americas | X | |||||||||||||
| Do. | Pittsboro, IN | Steel Dynamics, Inc. | X | |||||||||||||
| Do. | Ahoskie (Cofield), NC | Nucor Corp. | X | |||||||||||||
| Do. | Koppel, PA | TMK IPSCO | X | |||||||||||||
| Do. | Latrobe (Natrona Heights), PA | Allegheny Technologies Inc. (ATI) | X | |||||||||||||
| Do. | Steelton, PA | ArcelorMittal USA | X | |||||||||||||
| Do. | Midlothian, TX | Gerdau Long Steel North America | X | |||||||||||||
| Do. | Geneva (Provo), UT | Old slag pile site | X | |||||||||||||
| LafargeHolcim Ltd. | South Chicago, IL | ArcelorMittal USA | X | |||||||||||||
| Do. | East Chicago (Indiana Harbor), IN6 | do. | X | X | ||||||||||||
| Do. | Sparrows Point, MD | Domestic and foreign | X | |||||||||||||
| Do. | Detroit, MI | do. | X | |||||||||||||
| Do. | Cleveland (Cuyahoga Co.), OH5 | ArcelorMittal USA | X | |||||||||||||
| Do. | Lordstown, OH | Old slag pile site | X | |||||||||||||
| Do. | West Mifflin (Duquesne), PA | United States Steel Corp. (ET Works) | X | |||||||||||||
| Do. | Seattle, WA | Foreign | X | |||||||||||||
| Lehigh Hanson, Inc. | San Francisco, CA | do. | X | |||||||||||||
| Do. | Cape Canaveral, FL | do. | X | |||||||||||||
| Do. | Camden, NJ | do. | X | |||||||||||||
| Do. | Cementon, NY | do. | X | |||||||||||||
| Do. | Middlebranch, OH | Domestic and foreign | X | |||||||||||||
| Do. | Evansville, PA | Foreign | X | |||||||||||||
| LoMc LLC | Mingo Junction, OH | Slag pile (former RG Steel LLC) | X | X | X | |||||||||||
| Mountain Materials, Inc. | Ashland, KY | Old slag pile site | X | |||||||||||||
| Ozinga Cement, Inc. | Chicago, IL | Foreign | X | |||||||||||||
| Phoenix Services, LLC | Rancho Cucamonga, CA | CMC Steel California | X | |||||||||||||
| Do. | Riverdale, IL | ArcelorMittal USA | X | |||||||||||||
| Do. | Indiana Harbor, East Chicago, IN | ArcelorMittal USA (“E” and “W” sides) | X | X | ||||||||||||
| Do. | Burns Harbor, IN | ArcelorMittal USA | X | X | ||||||||||||
| Do. | Wilton, IA | Gerdau Long Steel North America | X | |||||||||||||
| Do. | Ghent, KY | Nucor Corp., North American Stainless | X | |||||||||||||
| Do. | Steubenville, OH | Old slag pile site | X | |||||||||||||
| Do. | Marion, OH | Nucor Corp. | X | |||||||||||||
| Do. | Latrobe, PA | Latrobe Specialty Steel Co. | X | |||||||||||||
| Do. | Roanoke, VA | Steel Dynamics, Inc. | X | |||||||||||||
| Do. | Weirton, WV | Old slag pile site | X | |||||||||||||
| Skyway Cement Co. | Chicago, IL | United States Steel Corp. | X | |||||||||||||
| Do. | Gary, IN | do. | X | |||||||||||||
| St. Marys Cement Inc. | Detroit, MI | Domestic and foreign | X | |||||||||||||
| Do. | Milwaukee, WI | do. | X | |||||||||||||
| TMS International Corp. | Axis, AL | SSAB North America | X | |||||||||||||
| Do. | Birmingham, AL | Nucor Corp. | X | |||||||||||||
| Do. | Calvert, AL | Outokumpu Stainless USA, LLC | X | |||||||||||||
| Do. | Decatur (Trinity), AL | Nucor Corp. | X | |||||||||||||
| Do. | Tuscaloosa, AL | do. | X | |||||||||||||
| Do. | Fort Smith, AR | Gerdau Special Steel North America | X | |||||||||||||
| Do. | Osceola, AR | Big River Steel LLC | X | |||||||||||||
| Do. | Mesa, AZ | CMC Steel Arizona | X | |||||||||||||
| Do. | Cartersville, GA | Gerdau Long Steel North America | X | |||||||||||||
| Do. | Alton, IL | Alton Steel Inc. | X | |||||||||||||
| Do. | Granite City, IL5 | United States Steel Corp. | X | X | ||||||||||||
| Do. | Kankakee, IL | Nucor Corp. | X | |||||||||||||
| Do. | Peoria, IL | Keystone Steel & Wire Co. | X | |||||||||||||
| Do. | Sterling, IL | Sterling Steel Co., LLC | X | |||||||||||||
| Do. | Gary, IN | United States Steel Corp. | X | |||||||||||||
| Do. | Portage, IN | NLMK Indiana | X | |||||||||||||
| Do. | Ashland, KY5 | Old slag pile site | X | X | ||||||||||||
| Do. | Jackson, MI | Gerdau Special Steel North America | X | |||||||||||||
| Do. | Monroe, MI | do. | X | |||||||||||||
| Do. | St. Paul, MN | do. | X | |||||||||||||
| Do. | Jackson, MS | Nucor Corp. | X | |||||||||||||
| Do. | Charlotte, NC | Gerdau Long Steel North America | X | |||||||||||||
| Do. | Norfolk, NE | Nucor Corp. | X | |||||||||||||
| Do. | Sayreville, NJ | CMC Steel New Jersey | X | |||||||||||||
| Do. | Auburn, NY | Nucor Corp. | X | |||||||||||||
| Do. | Canton, OH | Republic Engineered Products, Inc. | X | |||||||||||||
| Do. | Cleveland, OH5 | ArcelorMittal USA | X | X | ||||||||||||
| Do. | Cleveland, OH | Charter Steel | X | |||||||||||||
| Do. | Lorain, OH | Republic Engineered Products, Inc. | X | X | X | |||||||||||
| Do. | Mansfield, OH | AK Steel Corp. | X | |||||||||||||
| Do. | Middletown, OH | do. | X | X | ||||||||||||
| Do. | Youngstown, OH | Vallourec Star, LP. | X | |||||||||||||
| Do. | Durant, OK | CMC Steel Oklahoma | X | |||||||||||||
| Do. | McMinnville, OR | Cascade Steel Rolling Mills, Inc. | X | |||||||||||||
| Do. | Braddock, PA | United States Steel Corp. | X | |||||||||||||
| Do. | Bridgeville, PA | Universal Stainless & Alloy Products, Inc. | X | |||||||||||||
| Do. | Burnham, PA | Standard Steel, LLC | X | |||||||||||||
| Do. | Coatsville, PA | ArcelorMittal USA | X | |||||||||||||
| Do. | Park Hill (Johnstown), PA | Old slag pile site | X | X | ||||||||||||
| Do. | Reading, PA | Carpenter Technology Corp. | X | |||||||||||||
| Do. | Cayce, SC | CMC Steel South Carolina | X | |||||||||||||
| Do. | Darlington, SC | Nucor Corp. | X | |||||||||||||
| Do. | Gallatin, TN | Hoeganaes Corp. | X | |||||||||||||
| Do. | Jackson, TN | Gerdau Long Steel North America | X | |||||||||||||
| Do. | Knoxville, TN | CMC Steel Tennessee | X | |||||||||||||
| Do. | Beaumont, TX | Optimus Steel, LLC. | X | |||||||||||||
| Do. | Jewett, TX | Nucor Corp. | X | |||||||||||||
| Do. | Lone Star, TX | United States Steel Corp. | X | |||||||||||||
| Do. | Longview, TX | Nucor Corp. | X | |||||||||||||
| Do. | Seguin, TX | CMC Steel Texas | X | |||||||||||||
| Do. | Plymouth, UT | Nucor Corp. | X | |||||||||||||
| Do. | Petersburg, VA | Gerdau Long Steel North America | X | |||||||||||||
| Do. | Saukville, WI | Charter Steel | X | |||||||||||||
| Vinton Steel, LLC | Vinton (El Paso), TX | Vinton Steel, LLC | X | |||||||||||||
Do., do. Ditto.
1Table consists of data from the previous annual cycle.
2Blast furnace slag type abbreviations: AC = air-cooled; GBFS = ground and unground granulated blast furnace slag; PEL = pelletized. Steel furnace slag types: BOF = basic oxygen furnace; OHF = open hearth furnace; EAF = electric arc furnace.
3Currently operating iron and (or) steel company. Company is not shown for old slag pile sites.
4“Foreign” refers to the fact that the facility imports unground granulated blast furnace slag and grinds it on site to make ground granulated blast furnace slag, commonly referred to as “slag cement.” “Domestic” implies grinding of slag sourced from the domestic market, not a service contract.
5For air-cooled slag, Stein, Inc. was responsible for the cooling but the processing and marketing were handled by Beelman Truck Co. (Granite City, IL) and Lafarge North America Inc. (Cleveland, OH).
6LafargeHolcim Ltd. ground some of the granulated slag from East Chicago, IN, at some of its cement plants located elsewhere.
Source: United States Geological Survey Mineral Resources Program
See also: Iron and Steel Slag statistics | Mineral commodity prices