Ilsenburger Grobblech GmbH produces quarto plate for the most varied applications and uses. The company employs a workforce of 800 at its Ilsenburg and Salzgitter locations. Strategically situated in the center of Germany and Europe, the locations have a joint annual output of some 800,000 tons of plate in about 350 steel grades for customers around the globe. With about 200,000 tons of plate p.a. supplied to major renewable energy projects, the company already holds a strong position in this market segment. Deliveries to onshore and offshore wind energy projects include plate blanks for the production of monopiles, jacket structures, transition pieces and shell blanks for wind towers.

Manufacturing program

Conventional and heavy structural steels, shipbuilding and offshore grades, tube and pipe starting material, toughened steels, case-hardening and heat-treatable steels, acid- and wear-resistant steels


  • Thickness: 6 mm – 175 mm (greater thicknesses on request)
  • Width: 800 mm – 3,500 mm
  • Length: up to 24
  • Unit weight: up to 28 t

Steel grades

  • 350 different steel grades
  • Other specifications on request

Special features / advantages for our customers

  • High unit weights
  • Blanks (e.g. cones) and welding edge preparation by milling or flame cutting
  • Approvals from all major classification societies, such as Germanischer Lloyd, Lloyd’s Register, Det Norske Veritas, Bureau Veritas


  • API Q1
  • BS OHSAS 18001
  • DIN EN ISO 50001
  • DIN EN ISO 9001
  • DIN EN ISO 14001