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Harsco was founded in 1853 as The Harrisburg Car Manufacturing Company and became the Harrisburg Steel Corporation in 1935. Following a series of acquisitions, the company became Harsco Corporation in 1956, forming three divisions: Metals & Minerals (Now Harsco Environmental), Rail, and Industrial.
By the early 1990s, Harsco products and services covered defense, industrial, commercial, and construction applications, with over 250 manufacturing, reclamation, distribution, and service facilities across 14 countries.
In 2018, Harsco acquired Altek, a UK producer of aluminum processing equipment.
In 2019, Harsco Metals & Minerals rebranded to Harsco Environmental, and acquired Clean Earth, a U.S. provider of services for specialty waste streams.
In April 2020, Harsco Corporation acquired the Environmental Solutions business (ESOL) from Stericycle, Inc. The company finally rebranded as Enviri in 2023.
Enviri operates as the mother company with its three main divisions Clean Earth, Harsco Environmental and Harsco Rail. Additional subsidiary companies include Altek, SteelPhalt, and Black Beauty Abrasives.