US2021332466A1PendingUtilityA1

Steel product for use in contact with steel material

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Assignee: KUBOTA KKPriority: Nov 6, 2017Filed: Aug 23, 2018Published: Oct 28, 2021
Est. expiryNov 6, 2037(~11.3 yrs left)· nominal 20-yr term from priority
Inventors:Kunihide HashimotoYohei Enjo
C22C 38/02C22C 38/04C22C 38/58B22D 15/005C22C 38/48C22C 38/06C22C 30/00C22C 38/44C21D 9/563C23C 8/10C22C 38/005C23C 4/10B22D 19/16C22C 38/50B22D 13/02C22C 19/05C22C 38/00C21D 9/68
45
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Claims

Abstract

The present invention provides a steel product that has excellent oxidation resistance on a surface thereof that is to come into contact with a steel material and that also has excellent weldability. The steel product for use in contact with a steel material according to the present invention is a steel product for use in contact with a steel material, the steel product including a centrifugally-cast portion formed on a surface of the steel product that is to come into contact with the steel material, the centrifugally-cast portion being made through centrifugal casting, and a statically-cast portion to which the centrifugally-cast portion is welded, the statically-cast portion being formed through static casting, the centrifugally-cast portion containing, in terms of mass %, C: 0.2% to 0.7%; Si: more than 0% and 2.0% or less; Mn: more than 0% and 3.0% or less; Cr: 15.0% to 40.0%; Ni: 18.0% to 55.0%; Al: 1.0% to 5.5%; and at least one type selected from the group consisting of Ti: 0.01% to 0.6% and/or Nb: 0.1% to 1.8%, the balance being composed of Fe and inevitable impurities.

Claims

exact text as granted — not AI-modified
1 - 7 . (canceled) 
     
     
         8 . A steel product for use in contact with a steel material, the steel product comprising:
 a centrifugally-cast portion formed on a surface of the steel product that is to come into contact with the steel material, the centrifugally-cast portion being made through centrifugal casting; and   a statically-cast portion to which the centrifugally-cast portion is welded, the statically-cast portion being formed through static casting,   the centrifugally-cast portion containing, in terms of mass %:
 C: 0.2% to 0.7%; 
 Si: more than 0% and 2.0% or less; 
 Mn: more than 0% and 3.0% or less; 
 Cr: 15.0% to 40.0%; 
 Ni: 18.0% to 55.0%; 
 Al: 1.0% to 5.5%; and 
 at least one type selected from the group consisting of Ti: 0.01% to 0.6% and/or Nb: 0.1% to 1.8%, 
 the balance being composed of Fe and inevitable impurities. 
   
     
     
         9 . The steel product according to  claim 8 ,
 wherein the centrifugally-cast portion further contains, in terms of mass %,   rare earth elements (REMs): more than 0% and 0.4% or less.   
     
     
         10 . The steel product according to  claim 8 ,
 wherein the centrifugally-cast portion further contains, in terms of mass %:   W: more than 0% and 5.0% or less; and/or   Mo: more than 0% and 2.0% or less.   
     
     
         11 . The steel product according to  claim 9 ,
 wherein the centrifugally-cast portion further contains, in terms of mass %:   W: more than 0% and 5.0% or less; and/or   Mo: more than 0% and 2.0% or less.   
     
     
         12 . The steel product according to  claim 8 ,
 wherein the centrifugally-cast portion satisfies Pa<Ya, where
   Pa=−11.1+28.1×C+29.2×Si—0.25×Ni−45.6×Ti+18.0×REMs−16.6×Nb, and
 
   Ya=−13.75×Al+63.75.
 
   
     
     
         13 . The steel product according to  claim 9 ,
 wherein the centrifugally-cast portion satisfies Pa<Ya, where
   Pa=−11.1+28.1×C+29.2×Si—0.25×Ni−45.6×Ti+18.0×REMs−16.6×Nb, and
 
   Ya=−13.75×Al+63.75.
 
   
     
     
         14 . The steel product according to  claim 10 ,
 wherein the centrifugally-cast portion satisfies Pa<Ya, where
   Pa=−11.1+28.1×C+29.2×Si—0.25×Ni−45.6×Ti+18.0×REMs−16.6×Nb, and
 
   Ya=−13.75×Al+63.75.
 
   
     
     
         15 . The steel product according to  claim 11 ,
 wherein the centrifugally-cast portion satisfies Pa<Ya, where
   Pa=−11.1+28.1×C+29.2×Si—0.25×Ni−45.6×Ti+18.0×REMs−16.6×Nb, and
 
   Ya=−13.75×Al+63.75.
 
   
     
     
         16 . The steel product according to  claim 8 ,
 wherein the statically-cast portion does not contain Al.   
     
     
         17 . The steel product according to  claim 9 ,
 wherein the statically-cast portion does not contain Al.   
     
     
         18 . The steel product according to  claim 10 ,
 wherein the statically-cast portion does not contain Al.   
     
     
         19 . The steel product according to  claim 11 ,
 wherein the statically-cast portion does not contain Al.   
     
     
         20 . The steel product according to  claim 12 ,
 wherein the statically-cast portion does not contain Al.   
     
     
         21 . The steel product according to  claim 13 ,
 wherein the statically-cast portion does not contain Al.   
     
     
         22 . The steel product according to  claim 14 ,
 wherein the statically-cast portion does not contain Al.   
     
     
         23 . The steel product according to  claim 15 ,
 wherein the statically-cast portion does not contain Al.   
     
     
         24 . The steel product according to  claim 8 , further comprising:
 a ceramic thermal sprayed layer on the surface of the centrifugally-cast portion.   
     
     
         25 . The steel product according to  claim 8 , which is a hearth roll or a coiler drum.

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