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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Definition

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.

Benefits

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 designation Application Component weight Grades  
Steam-turbine shafts Machine components for the energy sector max. 30 t 1.6946, 1.6945, 1.6957, 1.4902, 1.4906, 1.4996, 1.4923 Request quotation
Modules Machine components for the energy sector max. 30 t 1.6946, 1.6945, 1.6957, 1.4902, 1.4906 Request quotation
Generator shafts Machine components for the energy sector max. 40 t  1.6957, 1.6948 Request quotation
Intermediate shafts Machine components for the energy sector max. 10 t 1.6957, 1.6948 Request quotation
Rolls Mechanical and plant engineering max. 40 t 1.2360, 1.2344, 1.2334, 1.6580, 1.6782, 1.7228 Request quotation
Compressor shafts Compressors max. 40 t 1.6948, 16580 Request quotation
Wheel/Gearwheel shafts Mechanical and plant engineering on request 1.6587, 1.6580, 1.7225 Request 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 designation Application Component weight Grades  
Modules Machine components for the energy sector max. 30 t 1.6946, 1.6957, 1.4906 Request quotation
Turbine discs Machine components for the energy sector on request 1.6957, 1.4906, 1.4996 Request quotation
Compressor discs Machine components for the energy sector on request 1.6948, 1.6957, 1.4906 Request quotation
Impeller wheels Compressors on request 1.4313, 1.4418 Request quotation
Blade wheels Machine components for the energy sector/hydropower max. 45t 1.4313, 1.4418 Request quotation
Impeller wheels/Runners  Mechanical and plant engineering on request 1.6587, 1.6580, 1.7225 Request quotation
Primary/Secondary closure heads Pressure vessels/Nuclear waste disposal on request 1.4313 Request quotation
Vessel heads/bottoms Pressure vessels on request 1.4462, 1.4541, 1.4301 Request quotation
Customised disc-type components       Request quotation

Machined open-die forgings

Forgings for pumps/valves

Type Application Component weight Grades  
Square sections Oil & Gas/fracking on request 1.4542, 1.4313, 1.6932 Request quotation
Square sections/shouldered Machine components for the energy sector on request 1.4903, 1.4901, 1.6368, 1.7380 Request quotation
Square sections Mining/Chemicals and petrochemicals industry on request

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

Request quotation
Discs Machine components for the energy sector on request 1.4313 Request 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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Contact

Andreas Bruntsch

Sales Director Open Die Forgings & Machining