METHOD OF PRODUCTION OF DIFFICULT TO FORM FORGING OF HIGH-ALLOY STEELS AND ALLOYS Russian patent published in 2005 - IPC

FIELD: metallurgy.

SUBSTANCE: invention relates to production of forgings of high alloy nickel-based steels and alloys which are difficult to form. According to proposed method, ingot is placed without preliminary roughing into furnace heater up to 400. Ingot is heated in heating furnace first to 600±10°C at rate not exceeding 50°C/h and is held at this temperature for 1.5-2.5 h. Then ingot is heated to 700±10°C at rate of 50°C/h maximum and is held at this temperature for 0.8-1.2 h. Heating of ingot to forging temperature of (1150-1180)±10°C is carried out at any rate, and ingot is held at this temperature for 3-5 h.

EFFECT: increased yield of ready metal and getting of fine-grained structure, provision of high level of mechanical properties and adaptability to further processing of forgings.

4 cl, 1 ex