Electric Arc Furnaces (EAFs) and Argon-Oxygen Decarburization Vessels (AOD): New Source Performance Standards - 40 CFR 60 Subparts AA, AAa, and AAb
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Rule Summary
The New Source Performance Standards (NSPS) for Steel Plants: Electric Arc Furnaces and Argon Oxygen Decarburization Vessels were proposed on October 21, 1974, promulgated on September 23, 1975, and most-recently amended on February 22, 2005. These regulations regulate emissions of particulate matter and apply to existing and new facilities that produce carbon, alloy, or specialty steels: electric arc furnaces (EAFs), argon oxygen decarburization (AOD) vessels, and dust handling systems. New facilities include those that commenced construction, modification or reconstruction after the date of proposal. This information is being collected to assure compliance with 40 CFR Part 60, Subparts AA and AAa.
Rule History
02/14/2024 - Interim Final Rule: Request for Comment (89 FR 11198)
08/25/2023 - Final rule (88 FR 58442) (subparts AA & AAa & AAb)
08/12/2022 - Comment Period Extension, Correction (87 FR 49796)
07/13/2022 - Comment Period Extension (87 FR 41639)
05/16/2022 - Proposed Rule; Electric Arc Furnaces (87 FR 29710) (subparts AA & AAa & AAb)
02/22/2005 - Final rule; amendments (70 FR 8523) (subparts AA & AAa)
10/16/2002 - Proposed rule; amendments (67 FR 64014) (subparts AA & AAa)
03/02/1999 - Direct final rule; amendments to rule (64 FR 10105) (subparts AA & AAa)
10/31/1984 - Final rule 49 FR 43838 (subparts AA & AAa)
08/17/1983 - Proposed rule (subparts AA & AAa)
09/23/1975 - Final rule (40 FR 43850) (subpart AA)
10/21/1974 - Proposed rule (subpart AA)
Additional Resources
Background Information Document
EAF NSPS Redline Versions of Final Rule Changes for 40 CFR part 60, subparts AA and AAa (pdf)
EAF NSPS Redline Versions of Final Rule Changes for 40 CFR part 60, subpart AAb (pdf)
View the supporting documents in the docket folder to find additional related documents to the rules.