Patent ID: 11919065
Assignee: PROTERIAL, LTD.
Field: Basic materials chemistry (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A method for producing a hot forged material by hot forging in which a die surface temperature is 1000° C. or more, comprising:
applying a second glass-based lubricant of a glass powder or a mixture of a powder and a dispersant onto each surface of a lower die and an upper die in contact with a material for hot forging to coat the surfaces with a lubricating film formed by the second glass-based lubricant, the lubricating film having a thickness of 100 μm or more and the glass powder comprising SiO2 as a main component and further comprising Al2O3 and CaO, wherein a total content of alkali metal oxides in the glass powder is 0 to 10.0% in mass %;
heating the material for hot forging at a hot forging temperature of 1000° C. or more to provide a heated material;
placing on the lower die the heated material for hot forging, wherein part or all of a surface of the material for hot forging is coated with a first glass-based lubricant; and
pressing the material for hot forging with the lower die and the upper die, to form a hot forged material,
wherein one or both of the lower die and the upper die are made of a Ni-based superalloy, and
wherein the Ni-based superalloy comprises, in mass %, Cr in an amount of 1.0 to 7.5%.