公开(公告)号：EP4098756A1

公开(公告)日：2022-12-07

申请号：EP21748377.5

申请日：2021-01-28

申请人： NIPPON STEEL CORPORATION

发明人： HAYASHI, Kosuke ,  HIDAKA, Yasuyoshi ,  KONDO, Yasumitsu ,  FUJITA, Aya ,  MIYAMOTO, Seiji ,  KAGARI, Takayoshi ,  NOHARA, Wataru

IPC分类号： C21D1/70 ,  C03C8/16 ,  C09K15/02 ,  C22C19/05 ,  C22C38/00 ,  C22C38/38

摘要： An antioxidant agent for heating an alloy material excellent in blocking resistance, and further excellent in oxidation resistance even when heated at a high temperature for a long time is provided. The antioxidant agent for heating an alloy material according to the present embodiment consists of, in mass%, SiO 2 : 40.0 to 80.0%, Al 2 O 3 : 0 to 30.0%, MgO: 0 to 5.0%, 10.00 to 50.00% in total of one kind or more selected from a group consisting of Na 2 O: 10.0% or less, K 2 O: 20.00% or less, and CaO: 25.0% or less, and B 2 O 3 : 0 to less than 0.5%, the balance being impurities, and satisfying Formula (1):

        (2SiO 2 + Al 2 O 3 ) / (0.1MgO + 0.2B 2 O 3 + 6Na 2 O + 1.4K 2 O + 2CaO) ≤ 2.50     (1)

where a content in mass% of a corresponding component is substituted for each chemical formula in Formula (1).