Martin utilizes closed impression die forging. Here, two dies containing the impression
of the shape are brought together deforming the metal. Martin provides two
types of closed impression die forgings: Hammer Forgings and Press Forgings.
Hammer Forging - Forging on a hammer is carried out in a succession of die
impressions using repeated blows. Hammer forging can work to nearer net shape with smaller forging allowance,
therefore on high cost or difficult to machine alloys there can be significant
advantages in the Hammer Forging process. Hammer forgings can usually produce larger and heavier parts than press
Press Forgings - The stock is usually hit only once in each die impression.
Increased deformation and control achieved though press forging will give the
material better consistency of properties.
Up to 20” length
Carbon steel .25 to 45 pounds
Alloy steel .25 to 45 pounds
Stainless Steel .15 to 25 pounds
Up to 12” diameter or 14” length
Carbon steel 1.5 to 40 pounds
Alloy steel 1.5 to 40 pounds
Stainless steel 1.5 to 20 pounds
Other metalworking and inspection processes complement the forging of carbon,
alloy and stainless steel components and parts.
• Heat Treatment
• CNC Machining, Broaching
• Magnetic Particle Inspection
• Liquid Penetrant Inspection
• Grinding, Polishing
• Plating or Coating