Steel rod

Abstract

A bar-shaped steel product extends unidirectionally and has a chemical composition including, by mass %, 0.001 to 0.20% of C, 0.01 to 3.0% of Si, 0.01 to 2.0% of Mn, 0.01 to 5.0% of Ni, 7.0 to 35.0% of Cr, 0.01 to 5.0% of Mo, 0.01 to 3.0% of Cu, 0.001 to 0.10% of N, 0.2 to 2.0% of Nb, optional element(s), and a balance consisting of Fe and inevitable impurities, and has 0.5 or less of a rolling-direction-crystal-orientation RD//<100> fraction (an area ratio of crystal having 20 degrees or less of an orientation difference between a <100> orientation and a rolling direction).

1 . A bar-shaped steel product extending unidirectionally and comprising a chemical composition comprising: by mass %,
 0.001 to 0.09% of C;   0.01 to 3.0% of Si;   0.01 to 2.0% of Mn;   0.01 to 5.0% of Ni;   7.0 to 35.0% of Cr;   0.01 to 5.0% of Mo;   0.01 to 3.0% of Cu;   0.001 to 0.10% of N;   0.2 to 2.0% of Nb;   0 to 2.0% of Ti;   0 to 2.0% of V;   0 to 0.1% of B;   0 to 5.0% of Al;   0 to 2.5% of W;   0 to 0.05% of Ga;   0 to 2.5% of Co;   0 to 2.5% of Sn;   0 to 2.5% of Ta;   0 to 0.05% of Ca;   0 to 0.012% of Mg;   0 to 0.012% of Zr;   0 to 0.05% of REM; and   a balance consisting of Fe and inevitable impurities,   the bar-shaped steel product comprising 0.5 or less of a rolling-direction-crystal-orientation RD//<100> fraction, the rolling-direction-crystal-orientation RD//<100> fraction meaning an area ratio of crystal having 20 degrees or less of an orientation difference between a <100> orientation and a rolling direction.   
     
     
         2 . The bar-shaped steel product according to  claim 1 , wherein
 the chemical composition further comprises, by mass %, at least one selected from 0.001 to 2.0% of Ti, 0.001 to 2.0% of V, 0.0001 to 0.1% of B, 0.001 to 5.0% of Al, 0.05 to 2.5% of W, 0.0004 to 0.05% of Ga, 0.05 to 2.5% of Co, 0.01 to 2.5% of Sn, 0.01 to 2.5% of Ta, 0.0002 to 0.05% of Ca, 0.0002 to 0.012% of Mg, 0.0002 to 0.012% of Zr, and 0.0002 to 0.05% of REM.   
     
     
         3 . (canceled) 
     
     
         4 . A bar-shaped steel product extending unidirectionally,
 and comprising the chemical composition according to  claim 1 , and a transition temperature of 200 degrees C. or less.   
     
     
         5 . The bar-shaped steel product according to  claim 1 , comprising a transition temperature of 200 degrees C. or less. 
     
     
         6 . The bar-shaped steel product according to  claim 1 , comprising a cross section whose shape is a circle, wherein
 a diameter of the circle is in a range from 15.0 to 200 mm.   
     
     
         7 . A bar-shaped steel product extending unidirectionally,
 and comprising the chemical composition according to  claim 2 , and a transition temperature of 200 degrees C. or less.   
     
     
         8 . The bar-shaped steel product according to  claim 2 , comprising a transition temperature of 200 degrees C. or less. 
     
     
         9 . The bar-shaped steel product according to  claim 2 , comprising a cross section whose shape is a circle, wherein
 a diameter of the circle is in a range from 15.0 to 200 mm.   
     
     
         10 . The bar-shaped steel product according to  claim 4 , comprising a cross section whose shape is a circle, wherein
 a diameter of the circle is in a range from 15.0 to 200 mm.   
     
     
         11 . The bar-shaped steel product according to  claim 5 , comprising a cross section whose shape is a circle, wherein
 a diameter of the circle is in a range from 15.0 to 200 mm.   
     
     
         12 . The bar-shaped steel product according to  claim 7 , comprising a cross section whose shape is a circle, wherein
 a diameter of the circle is in a range from 15.0 to 200 mm.   
     
     
         13 . The bar-shaped steel product according to  claim 8 , comprising a cross section whose shape is a circle, wherein
 a diameter of the circle is in a range from 15.0 to 200 mm.