Margarete and Heinrich Diehl established a small art foundry, which expanded to a leading industrial company for semi-finished products within a few years. Their son Karl Diehl created a worldwide leading technology enterprise.
Recognizing the signs of the time the company's strategy switched to diversification just a few years after the establishment. Diehl Metall focuses on variety and uses the strategic synergies of the five Corporate Division of the Diehl Group. We are optimally positioned with 14,000 employees and thus, we will support our customers and partners as experienced problem solver - with curiosity and inquiring spirit.

| 2013 | Merger of the companies OTB Oberflächentechnik in Berlin and Schempp & Decker Präzisionsteile und Oberflächentechnik with and into Diehl Metal Applications GmbH |
|---|---|
| 2012 | Innovations at DMA location Hemer: the 30-year-old, self-developed ERP system is replaced by a standard software/ Implementation of a inline drawing line with integrated induction annealer installation for wire. |
| 2012 | Establishment of Diehl Metal India Pvt. Ltd. in India. |
| 2012 | Diehl takes over the Schempp & Decker Präzisionsteile und Oberflächentechnik GmbH in Berlin with about 500 employees. |
| 2012 | Diehl Metall sells Griset S.A.S. and Diehl Metall Malaysia to BAVARIA France Metal S.A.S. |
| 2011 | Establishment of a DMA product development at its location Zehdenick. |
| 2011 | Investment in a strip processing line at the DMA location Hemer. |
| 2010 | Diehl Metall takes over Zehdenick Innovative Metall- und Kunststofftechnik GmbH (ZIMK) with about 300 employees. |
| 2009 | Diehl Metall invests in a new vertical casting machine at Roethenbach a d Pegnitz. Establishment of Diehl Metal Applications GmbH (DMA) with locations in Germany, France and China. |
| 2008 | Installation of an ultra sonic testing system for rods and tubes at Roethenbach a d Pegnitz. |
| 2007 | Takeover of Augé Découpage in France (now Diehl Augé Découpage S.A.S.). Diehl Metall starts new steel synchronizer ring production at Roethenbach a d Pegnitz. |
| 2006 | Formation of Diehl Power Electronic S.A.S. in France. Diehl Metall takes over OTB Oberflaechentechnik in Berlin. |
| 2004 | A new 35/40 MN extrusion press was put into operation at the location Roethenbach a d Pegnitz. |
| 2003 | Second 20 roll stand at Sundwiger Messingwerk put into operation. Establishment of Diehl Synchro Tec Manufacturing (Wuxi) Co. Ltd. in China. |
| 2002 | Large investment in rod production at Diehl Metall Messing in Roethenbach a d Pegnitz completed. |
| 2001 | At the location Roethenbach a d Pegnitz, activities are divided into the business units Diehl Metall Messing, Diehl Metall Schmiedetechnik and Diehl Metall Fuehrungsgesellschaft. Start of construction of the new logistic center including a high bay shelving warehouse for rods. |
| 2000 | Takeover of The Miller Company (USA) by Diehl Metall. |
| 1999 | In the course of restructuring of the Diehl Group, Roethenbach a d Pegnitz becomes the headquarters of the Corporate Division Diehl Metall. |
| 1998 | New indirect extrusion press at the location Roethenbach a d Pegnitz put into operation. Relocation of the entire forge to new facilities. 40,000 sqm of production area now available. In Shenzhen, north of Hong Kong, a slitting and service center is established. 300 year anniversary of Sundwiger Messingwerk. |
| 1997 | Diehl Metall takes over the French company Griset S.A.S., Villers St.-Paul, thus expanding its rolling activities. |
| 1995 | Production started of newly developed cadmium-free and thus environmentally friendly overhead wire for the Deutsche Bahn AG. |
| 1990 | A new dust filtration system was set up to reduce air pollution well below legal limits (pilot project by the “Berlin Department of Environment"). |
| 1988 | Extension of the foundry building for two horizontal continuous casting lines. |
| 1987 | Expansion of the tube plant. |
| 1985 | Extension of the laboratory building at Diehl Metall Messing. Installation of heat recovery systems in the foundry to reduce energy consumption. |
| 1984 | Construction of a new administration building to bundle administrative and distributive activities in one place. |
| 1981 | Erection of a new strip rolling mill at Sundwiger Messingwerk. |
| 1977 | Set-up of the “Schumag hall”. |
| 1976 | Increased capacity by installing the “Demag Continuous Casting System”. Construction of a dust filtration system for the foundry. |
| 1975 | Installation of another tube press with a press force of 2,350 tons. |
| 1974 | Expansion of the drop forge by 5,500 sqm. |
| 1973 | Formation of Diehl do Brasil Metalúrgica. |
| 1962 | Construction of the first continuous dual-string casting plant for brass with an annual capacity of 47,000 tons. |
| 1961 | Planning and Construction of a new tube plant including a 1,600 ton press. |
| 1958 | Entry into rolled-product manufacture with the acquisition of the long-established company Sundwiger Messingwerk KG, Hemer. |
| 1956 | Start of synchronizer-ring production for first time synchronization of manual transmissions automotive vehicles. |
| 1951 | Setup of a 3,500 ton press (the largest in Germany at the time). |
| 1949 | Reconstruction on the basis of remaining presses, furnaces and machine tools. Acquisition of a new 1,800 ton press for brass products. With this development the foundry was converted from light to heavy metal. |
| 1947 | Dismantling of almost the entire company’s equipment. |
| 1944 | Destruction of major parts of the plant facilities by air raids. |
| 1941 | Installation of a new 1,200 ton press for rods. |
| 1938 | Construction of a new plant for semi-finished products at Roethenbach a d Pegnitz. |
| 1920 | Investment in a modern extrusion press for the production of rods and tubes. |
| 1917 | Construction of a metal producing plant in Nuremberg at the Northeast Railroad Station. Start of industrial production. |
| 1914 | Production of rods and drop-forged parts launched at the Geuderstrasse site in Nuremberg. |
| 1902 | Margarete and Heinrich open an art foundry. |