Carburization resistant metal material

Abstract

There is provided a metal material having excellent workability and metal dusting resistance, which is suitable as a raw material for cracking furnaces, reforming furnaces, heating furnaces, heat exchangers, etc. in petroleum refining, petrochemical plants, and the like. The metal material is characterized by consisting of, by mass %, C: 0.08 to 0.4%, Si: 0.6 to 2.0%, Mn: 0.05 to 2.5%, P: 0.04% or less, S: 0.015% or less, Cr: 18 to 30%, Ni: 20% or higher and less than 30%, Cu: 0.5 to 10.0%, Al: 0.01 to 1%, Ti: 0.01 to 1%, N: 0.15% or less, and O (oxygen): 0.02% or less, the balance being Fe and impurities, and satisfying Expression (1). C≧0.062×Si+0.033×Cu−0.004×Cr+0.043  (1) in which the symbol of element in Expression (1) represents the content of that element in mass %.

1 . A carburization resistant metal material characterized by consisting of, by mass %, C: 0.08 to 0.4%, Si: 0.6 to 2.0%, Mn: 0.05 to 2.5%, P: 0.04% or less, S: 0.015% or less, Cr: 22 to 30%, Ni: 20% or higher and less than 30%, Cu: 0.5 to 10.0%, Al: 0.01 to 1%, Ti: 0.01 to 1%, N: 0.15% or less, and O (oxygen): 0.02% or less the balance being Fe and impurities, and satisfying Expression (1).
   C≧0.062×Si+0.033×Cu−0.004×Cr+0.043  (1)   
     in which the symbol of element in Expression (1) represents the content of that element in mass %. 
   
   
       2 . A carburization resistant metal material characterized by consisting of, by mass %, C: 0.08 to 0.4%, Si: 0.6 to 2.0%, Mn: 0.05 to 2.5%, P: 0.04% or less, S: 0.015% or less, Cr: 18 to 30%, Ni: 20% or higher and less than 30%, Cu: 0.5 to 10.0%, Al: 0.01 to 1%, Ti: 0.01 to 1%, N: 0.15% or less, and O (oxygen): 0.02% or less, the balance being Fe and impurities, and satisfying Expression (1).
   C≧0.062×Si+0.033×Cu−0.004×Cr+0.043  (1)   
     in which the symbol of element in Expression (1) represents the content of that element in mass %. 
   
   
       3 . The carburization resistant metal material according to  claim 1 , characterized by further containing, by mass %, at least one kind of a component selected from at least one group of the first group to the fifth group described below:
 first group: Co: 10% or less,   second group: Mo: 2.5% or less and W: 5% or less,   third group: B: 0.1% or less, V: 0.5% or less, Zr: 0.1% or less, Nb: 2% or less, and   Hf: 0.5% or less,   fourth group: Mg: 0.1% or less and Ca: 0.1% or less,   fifth group: Y: 0.15% or less, La: 0.15% or less, Ce: 0.15% or less, and Nd: 0.15% or less.   
   
   
       4 . The carburization resistant metal material according to  claim 2 , characterized by further containing, by mass %, at least one kind of a component selected from at least one group of the first group to the fifth group described below:
 first group: Co: 10% or less,   second group: Mo: 2.5% or less and W: 5% or less,   third group: B: 0.1% or less, V: 0.5% or less, Zr: 0.1% or less, Nb: 2% or less, and Hf: 0.5% or less,   fourth group: Mg: 0.1% or less and Ca: 0.1% or less,   fifth group: Y: 0.15% or less, La: 0.15% or less, Ce: 0.15% or less, and Nd: 0.15% or less.