Steel Composition for Expandable Tubular Articles, Expandable Tubular Article Having This Steel Composition, Manufacturing Method Thereof and Use Thereof

Abstract

A steel composition for expandable tubular articles comprises, in mass %, C: 0.03-0.12; Mn: 0.7-1.2; Si: 0.1-0.5; Cr: 0.1-1.0; Mo: 0.1-1.0; Ni: ≥0 and ≤1.0; V: 0-0.20; Nb: 0-0.10; iron (Fe) and inevitable impurities with the proviso that V+Nb≥0.01. A method for manufacturing such an expandable tubular article is also disclosed, as well as an expandable tubular article.

1 . A steel composition for expandable tubular articles comprising, in mass %,
 C: 0.03-0.12;   Mn: 0.7-1.2;   Si: 0.1-0.5;   Cr: 0.1-1.0;   Mo: 0.1-1.0;   Ni: >0 and ≤1.0;   V: 0-0.20;   Nb: 0-0.10;   iron (Fe) and inevitable impurities   with the proviso that   
       
         
           
             
               
                 V 
                 + 
                 Nb 
               
               ≥ 
               
                 0.01 
                 . 
               
             
           
         
       
     
     
         2 . The steel composition of  claim 1 , further comprising
 Ti: 0-0.10;   Al: 0-0.10.   
     
     
         3 . The steel composition of  claim 1 , wherein
 P T ≥90, wherein P T =485 V+130 Mo+4 ln(Mo)+18 ln(Cr)+12 ln(Si)+67, wherein the amounts of the elements are expressed in mass %; or   Al/1.9+Ti/3.4+Nb/6.6+V/3.6≥N, wherein the amounts of the elements are expressed in mass %.   
     
     
         4 . The steel composition of  claim 1 , wherein the inevitable impurities comprise
 Cu: 0-1.0;   B: 0-0.010;   N: 0-0.030;   P: 0-0.030;   S: 0-0.030.   
     
     
         5 . The steel composition of  claim 1 , wherein
 C: 0.05-0.10;   Mn: 0.7-1.2;   Si: 0.1-0.5;   Ni: 0.1-0.7;   Cr: 0.2-0.9;   Mo: 0.2-0.7;   V: 0.02-0.12;   Nb: 0.01-0.06;   Ti: 0-0.05;   Al: 0-0.05;   N: 0-0.015.   
     
     
         6 . The steel composition of  claim 1 , wherein:
 C: 0.06-0.09;   Mn: 0.8-1.1;   Si: 0.1-0.3;   Ni: 0.2-0.7   Cr: 0.4-0.8;   Mo: 0.25-0.60;   V: 0.03-0.08;   Nb: 0.02-0.04;   Ti: 0-0.04;   Al: 0-0.04;   N: 0-0.008.   
     
     
         7 . The steel composition of  claim 1 , wherein
 V+Nb≥0.02.   
     
     
         8 . The steel composition of  claim 1 , wherein
 B: 0-0.0050.   
     
     
         9 . The steel composition of  claim 1 , wherein
 P: 0-0.020;   S: 0-0.020.   
     
     
         10 . The steel composition of  claim 3 , wherein: P T ≥100, wherein
 P T =485 V+130 Mo+4 ln(Mo)+18 ln(Cr)+12 ln(Si)+67, wherein the amounts of the elements are expressed in mass %. 
 
     
     
         11 . The steel composition of  claim 3 , wherein: 
       
         
           
             
               
                 
                   P 
                   H 
                 
                 ≥ 
                 20 
               
               , 
             
           
         
         wherein P H =f*[C+Ni/41+Cu/35+Si/21+Mn/16+Cr/12+Mo/10+V/8]*100, wherein the amounts of the elements are expressed in mass %, wherein if B<0.0010; f=1, else f=3.5. 
       
     
     
         12 . A method of manufacturing an expandable tubular article, the method comprising:
 a) providing a tubular component;   b) austenitizing the tubular component at a temperature in the range of Ac3-1000° C.;   c) quenching the austenitized tubular component from step b) to a temperature below Mf at a quenching rate of 20° C./s or more in the range of 800-500° C.;   d) tempering the quenched tubular component from step c) at a tempering temperature in the range of 300°-Ac1;   wherein the tubular component has a composition according to  claim 1 .   
     
     
         13 . An expandable tubular article having a composition according to  claim 1 . 
     
     
         14 . The expandable tubular article of  claim 13  having after expansion of the inner diameter of the expandable tubular article of 15% the properties
 Yield strength (YS): ≥620 MPa (90 ksi); and 
 Charpy impact test: absorbed energy at −20° C.: ≥80 J. 
 
     
     
         15 . The expandable tubular article according to  claim 13  having before expansion the properties
 Yield strength (YS): ≥620 MPa (90 ksi); and 
 Charpy impact test: absorbed energy at −60° C.: ≥120 J. 
 
     
     
         16 . The expandable tubular article manufactured according to the method as defined in  claim 12 . 
     
     
         17 . The expandable tubular article according to  claim 13  having a microstructure comprising
 sum of martensite and bainite: ≥90 vol. %; 
 ferrite and/or pearlite: ≤10%. 
 
     
     
         18 . The expandable tubular article according to  claim 13  having before expansion, at least one of the properties selected from the group consisting of:
 Total elongation: ≥18%; 
 Lateral expansion: ≥1.8 mm; 
 Shear area: ≥85%. 
 
     
     
         19 . A use of an expandable article according to  claim 13  in expandable tubular applications downhole in a well.