Open-die forgings

Open-die forgings

Open-die forgings supplied by GMH Gruppe meet the most exacting customer requirements in terms of material properties, precision and dimensional accuracy. These parts are used, in particular, in machines and equipment for the energy sector, in high-output engines, as components of storage and transport casks, and in numerous other sectors, including general mechanical and plant engineering, mobility and power generation.

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GMH Gruppe produces its open-die forgings from high-grade stainless steels. The primary material – cast steel ingots – is shaped under highly skilled manual control precisely to customer specification on forging presses equipped with the necessary swaging and flat dies. On our high-performance 27 MN and 60 MN open-die forging presses, we produce forgings for every application, no matter how exacting.

Production process

From cast ingots with outstanding material properties – excellent cleanness, highly homogeneous microstructure, high resistance to wear and corrosion – we produce a raw, but very near-net, part in a number of forming operations, including upsetting and reducing the length and the cross-section of the ingot. For more complex geometries, it may be necessary to reheat the material between the individual process stages. Our production capabilities cover the entire value chain, from steel production in the electric arc furnace, the forging process, the heat treatment up to pre-machined or finished-machined products.


We use our full range of technical potentials to produce open-die forgings that perfectly meet our customers’ expectations and their requests for the most diverse geometries, specific heat treatments and a broad range of semi-machining and finish-machining options. We work with optimised material allowances, significantly reducing the need for downstream machining.

  • Open-die forgings up to 50 t
  • Great variety of material grades
  • Wide range of products

Our products and services

Shaft-type components

Round forgings with diameters up to 2,000 mm and lengths up to 9,500 mm

Product designationApplicationComponent weightGrades 
Steam-turbine shaftsMachine components for the energy sectormax. 30 t1.6946, 1.6945, 1.6957, 1.4902, 1.4906, 1.4996, 1.4923Request quotation
ModulesMachine components for the energy sectormax. 30 t1.6946, 1.6945, 1.6957, 1.4902, 1.4906Request quotation
Generator shaftsMachine components for the energy sectormax. 40 t 1.6957, 1.6948Request quotation
Intermediate shaftsMachine components for the energy sectormax. 10 t1.6957, 1.6948Request quotation
RollsMechanical and plant engineeringmax. 40 t1.2360, 1.2344, 1.2334, 1.6580, 1.6782, 1.7228Request quotation
Compressor shaftsCompressorsmax. 40 t1.6948, 16580Request quotation
Wheel/Gearwheel shaftsMechanical and plant engineeringon request1.6587, 1.6580, 1.7225Request quotation
Customised shaft-type components   Request quotation

Disc-type components

Round forgings with diameters up to 4,000 mm and thicknesses up to 1,500 mm.

Product designationApplicationComponent weightGrades 
ModulesMachine components for the energy sectormax. 30 t1.6946, 1.6957, 1.4906Request quotation
Turbine discsMachine components for the energy sectoron request1.6957, 1.4906, 1.4996Request quotation
Compressor discsMachine components for the energy sectoron request1.6948, 1.6957, 1.4906Request quotation
Impeller wheelsCompressorson request1.4313, 1.4418Request quotation
Blade wheelsMachine components for the energy sector/hydropowermax. 45t1.4313, 1.4418Request quotation
Impeller wheels/Runners Mechanical and plant engineeringon request1.6587, 1.6580, 1.7225Request quotation
Primary/Secondary closure headsPressure vessels/Nuclear waste disposalon request1.4313Request quotation
Vessel heads/bottomsPressure vesselson request1.4462, 1.4541, 1.4301Request quotation
Customised disc-type components   Request quotation

Machined open-die forgings

Forgings for pumps/valves

TypeApplicationComponent weightGrades 
Square sectionsOil & Gas/frackingon request1.4542, 1.4313, 1.6932Request quotation
Square sections/shoulderedMachine components for the energy sectoron request1.4903, 1.4901, 1.6368, 1.7380Request quotation
Square sectionsMining/Chemicals and petrochemicals industryon request

1.4404, 1.4313, 1.4021, 1.4571,
1.4301, 1.4057, 1.4541, 1.4462

Request quotation
DiscsMachine components for the energy sectoron request1.4313Request quotation
Customised machined open-die forgings   Request quotation

Heat-treatment options and non-destructive testing

  • Soft-annealing
  • Hot true-running test
  • Quenching and tempering (horizontal)
  • Automated ultrasonic testing
  • Quenching and tempering (vertical)
  • Spray quenching

Machining options

  • Milling
  • Grinding
  • Compression, tensile, Charpy V-notch tests
  • Turning
  • Ultasonic testing
  • Microstructure
  • Turning/Milling
  • Magnetic crack detection
  • Hardness tests (HV, HB, HRc)
  • Drilling
  • Determination of chemical analysis
  • Dimensional inspection

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Andreas Bruntsch

Sales Director Open Die Forging & Machining


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