Method of making a corrosion resistant tube

Abstract

One method for producing a bimetallic tubular component comprises hot isostatic pressing an assembly comprising two concentrically-positioned tubes including an inner tube comprising a corrosion-resistant nickel alloy, and an outer tube comprising a steel alloy, thereby forming a bimetallic tubular preform. The bimetallic tubular preform is flowformed, thereby forming a bimetallic tubular component comprising an inner corrosion-resistant nickel alloy layer and an outer steel alloy layer.

What is claimed is: 
     
         1 . A method for producing a bimetallic tubular component, the method comprising:
 hot isostatic pressing an assembly comprising two concentrically-positioned tubes, the two concentrically-positioned tubes comprising
 an inner tube comprising a corrosion-resistant nickel alloy, and 
 an outer tube comprising a steel alloy, 
   
       thereby forming a bimetallic tubular preform; and
 flowforming the bimetallic tubular preform, thereby forming a bimetallic tubular component comprising an inner corrosion-resistant nickel alloy layer and an outer steel alloy layer. 
 
     
     
         2 . The method of  claim 1 , wherein the inner tube comprising the corrosion-resistant nickel alloy and the outer tube comprising the steel alloy have different hardness values, and wherein the hardness value of the inner tube before the flowforming is greater than two times the hardness value of the outer tube before the flowforming. 
     
     
         3 . The method of  claim 1 , wherein the steel alloy comprises a low-carbon steel, a high-carbon steel, or a stainless steel; and wherein the nickel alloy comprises Alloy 625 or Alloy C-276. 
     
     
         4 . The method of  claim 1 , wherein the steel alloy comprises a duplex stainless steel; and wherein the nickel alloy comprises Alloy 625 or Alloy C-276. 
     
     
         5 . The method of  claim 1 , wherein the steel alloy comprises a low carbon steel; and wherein the nickel alloy comprises Alloy 625 or Alloy C-276. 
     
     
         6 . The method of  claim 1 , wherein the steel alloy comprises an AISI 1018 type steel, an AISI 1020 type steel, or an AISI 4130 type steel; and wherein the nickel alloy comprises Alloy 625 or Alloy C-276. 
     
     
         7 . The method of  claim 1 , wherein the steel alloy comprises an AISI 1018 type steel or an AISI 1020 type steel; and wherein the nickel alloy comprises Alloy 625. 
     
     
         8 . A method for producing a bimetallic tubular component, the method comprising:
 forming a bimetallic tubular preform comprising an inner layer metallurgically bonded to an outer layer, wherein
 the inner layer comprises a corrosion-resistant alloy, and 
 the outer layer comprises a duplex stainless steel or an aluminum alloy; and 
   flowforming the bimetallic tubular preform, thereby forming a bimetallic tubular component comprising an outer duplex stainless steel layer and an inner corrosion-resistant alloy layer.   
     
     
         9 . The method of  claim 8 , wherein the inner layer and the outer layer of the bimetallic tubular preform have different hardness values, and wherein the hardness value of the inner layer before the flowforming is greater than two times the hardness value of the outer layer before the flowforming. 
     
     
         10 . The method of  claim 8 , wherein forming the bimetallic tubular preform comprises hot isostatic pressing or hot extruding an assembly comprising an inner tube comprising the corrosion-resistant alloy and an outer tube comprising the duplex stainless steel or the aluminum alloy. 
     
     
         11 . The method of  claim 8 , wherein the inner layer comprises titanium, zirconium, or a nickel alloy; and the outer layer comprises a duplex stainless steel. 
     
     
         12 . The method of  claim 8 , wherein the inner layer comprises a nickel alloy; and the outer layer comprises a duplex stainless steel. 
     
     
         13 . The method of  claim 8 , wherein the inner layer comprises Alloy 625 or Alloy C-276; and the outer layer comprises a duplex stainless steel. 
     
     
         14 . A method for producing a bimetallic tubular component, the method comprising:
 forming an bimetallic tubular preform comprising an inner layer metallurgically bonded to an outer layer, wherein
 the inner layer comprises a corrosion-resistant nickel alloy; and 
 the outer layer comprises a steel alloy; and 
   flowforming the bimetallic tubular preform, thereby forming a bimetallic tubular component comprising an inner corrosion-resistant nickel alloy layer and an outer steel alloy layer.   
     
     
         15 . The method of  claim 14 , wherein the inner layer and the outer layer of the bimetallic tubular preform have different hardness values, and wherein the hardness value of the inner layer before the flowforming is greater than two times the hardness value of the outer layer before the flowforming. 
     
     
         16 . The method of  claim 14 , wherein forming the bimetallic tubular preform comprises hot isostatic pressing or hot extruding an assembly comprising an inner tube comprising the corrosion-resistant nickel alloy and an outer tube comprising the steel alloy. 
     
     
         17 . The method of  claim 14 , wherein the steel alloy comprises a low-carbon steel, a high-carbon steel, or a stainless steel; and wherein the nickel alloy comprises Alloy 625 or Alloy C-276. 
     
     
         18 . The method of  claim 14 , wherein the steel alloy comprises a low carbon steel; and wherein the nickel alloy comprises Alloy 625 or Alloy C-276. 
     
     
         19 . The method of  claim 15 , wherein the steel alloy comprises an AISI 1018 type steel, an AISI 1020 type steel, or an AISI 4130 type steel; and wherein the nickel alloy comprises Alloy 625 or Alloy C-276. 
     
     
         20 . The method of  claim 15 , wherein the steel alloy comprises an AISI 1018 type steel or an AISI 1020 type steel; and wherein the nickel alloy comprises Alloy 625.