Pro Tube INC | Zullinger | — | ● ACTIVE |
| STSalem Tube, Inc.. | Greenville | 100–499 | ● ACTIVE |
Sophisticated Alloys INC | Butler | — | ● ACTIVE |
Ssab, INC. | Moon Township | — | ● ACTIVE |
Techspec, INC. | Derry | — | ● ACTIVE |
| USUnited States Steel Corporation | Pittsburgh | — | ● ACTIVE |
Veritas Alloys & Metals, LLC | Rochester | — | ● ACTIVE |
Wer Corporation | Sinking Spring | — | ● ACTIVE |
| ASAlpha Sintered Metals | Ridgway | 100–499 | ◐ LIKELY ACTIVE |
| APAti Powder Metals, LLC | Oakdale | 20–99 | ◐ LIKELY ACTIVE |
| BFBeaver Falls Tubular Products LLC | Beaver Falls | 20–99 | ◐ LIKELY ACTIVE |
| BVBeaver Valley Alloy Foundry CO | Monaca | 20–99 | ◐ LIKELY ACTIVE |
| BABoose at Cornwall INC | Lebanon | 20–99 | ◐ LIKELY ACTIVE |
| CMConcast Metal Products CO | Mars | 20–99 | ◐ LIKELY ACTIVE |
| DMDormont Mfg CO | Export | 100–499 | ◐ LIKELY ACTIVE |
| DBDura Bond Pipe Llc/steelton | Steelton | 100–499 | ◐ LIKELY ACTIVE |
| GMGreenville Metals INC | Transfer | 20–99 | ◐ LIKELY ACTIVE |
| MIMetco Ind | Saint Marys | 100–499 | ◐ LIKELY ACTIVE |
| PTPhoenix Tube CO | Bethlehem | 100–499 | ◐ LIKELY ACTIVE |
| SPSt Prod LLC Dba Wieland Small Tube Prod/altoona | Duncansville | 100–499 | ◐ LIKELY ACTIVE |
| UEUnion Elec Steel Corp/greengarden Ave | Erie | 1–19 | ◐ LIKELY ACTIVE |
| VCVictaulic CO Forks Facility | Easton | 500+ | ◐ LIKELY ACTIVE |
| ARAbington Reldan Metals Fairless Hills Fac | Fairless Hills | — | ◐ LIKELY ACTIVE |
| AIAccellent Inc/collegeville Microcoax | Collegeville | — | ◐ LIKELY ACTIVE |
| AEAccuride Erie Lp/erie Forge Plt | Erie | — | ◐ LIKELY ACTIVE |
| ACAlcoa Commercial Windows LLC (dba Traco) | Cranberry Township | — | ◐ LIKELY ACTIVE |
| ALAllegheny Ludlum Latrobe Plant | Latrobe | — | ◐ LIKELY ACTIVE |
| ALAllegheny Ludlum LLC | Brackenridge | — | ◐ LIKELY ACTIVE |
| ASAmerican Sintered Technologies INC | Emporium | — | ◐ LIKELY ACTIVE |
| APArcelormittal Plate LLC - Coatesville Facility | Coatesville | — | ◐ LIKELY ACTIVE |
| APArcelormittal Plate LLC Conshohocken Facility | Conshohocken | — | ◐ LIKELY ACTIVE |
| BMBear Metallurgical Mfg | Butler | — | ◐ LIKELY ACTIVE |
| BSBlair Strip Steel Company | New Castle | 20–99 | ▲ REPORTED CLOSED |
| BPBluescope Prefab Bldg Mfg Annville | Annville | — | ◐ LIKELY ACTIVE |
| BFBoyertown Foundry Company | New Berlinville | — | ◐ LIKELY ACTIVE |
Bridesburg Foundry Co/whitehall | Whitehall | — | ◐ LIKELY ACTIVE |
| BLBrightsmith Llc/falls Twp | Morrisville | — | ◐ LIKELY ACTIVE |
| CLCambridge Lee Plants 2, 3, 4 | Reading | — | ◐ LIKELY ACTIVE |
Carpenter Technology CORP | Reading | — | ◐ LIKELY ACTIVE |
| CCChemalloy CO Conshohocken Fac | Conshohocken | — | ◐ LIKELY ACTIVE |
| CCCleveland Cliffs Steel Corp/ Butler Works | Butler | — | ◐ LIKELY ACTIVE |
| CPCoilplus Pennsylvania | Philadelphia | 20–99 | ◐ LIKELY ACTIVE |
| CSCronimet Specialty Metals USA INC | Greenville | — | ◐ LIKELY ACTIVE |
Dayton Superior CORP | Tremont | — | ◐ LIKELY ACTIVE |
| DIDonsco Inc/mt Joy | Mount Joy | — | ◐ LIKELY ACTIVE |
| EPEast Penn Kutztown Battery Plt | Kutztown | — | ◐ LIKELY ACTIVE |
| EGElectralloy Go Carlson - Oil City Facility | Oil City | — | ◐ LIKELY ACTIVE |
| FIFleetwood Industries INC. | Leesport | — | ◐ LIKELY ACTIVE |
| FDFlowline Div Ezeflow Usa/new Castle | New Castle | — | ◐ LIKELY ACTIVE |
| FSFrog Switch & Manufacturing CO | Carlisle | — | ◐ LIKELY ACTIVE |