1st October 1900 Heinrich Dieckerhoff arranges the construction of the first factory building for the foundry.
1946 The product spectrum embraces the bicycle industry, agricultural machinery, mining and the construction of fittings.
1960 Entry into the automotive supply industry.
1974 Award "Supplier of the Year" from Opel.
1976 First deliveries of engine components in spheroidal graphite cast iron.
1978 Renaming of the company from Heinrich Dieckerhoff KG to Gevelsberger Stahlwerk Heinr. Dieckerhoff GmbH & Co. KG.
1979 First deliveries of parts made of Ni-Resist.
1982 Extension of the portfolio of materials to include SiMo, GGG Si and GJV.
1989 Takeover by Harzer Graugusswerke GmbH based in Zorge – renaming of the company to Heinr. Dieckerhoff Guss GmbH. Subsequent merger with the parent company in Zorge to form AEK InterForm GmbH.
2000 Takeover by Georgsmarienhütte Holding GmbH.
Since 2005 Expansion of Ni-Resist production (D5 S).
