Nickel-chromium-iron-molybdenum alloy

Abstract

Nickel-chromium-iron-molybdenum alloy, comprising 40 to 48 wt % nickel, 30 to 38 wt % chromium, 4 to 12 wt % molybdenum and iron, wherein the alloy optionally further comprises up to 5 wt % manganese, up to 2 wt % copper, up to 0.6 wt % nitrogen, up to 0.5 wt % aluminium and up to 0.5 wt % vanadium.

1 . Nickel-chromium-iron-molybdenum alloy, comprising
 40 to 48 wt % nickel,   30 to 38wt % chromium,   4 to 12 wt % molybdenum,   and iron.   
     
     
         2 . Nickel-chromium-iron-molybdenum alloy, comprising:
 40 to 48 wt % nickel,   30 to 38 wt % chromium,   4 to 12 wt % molybdenum, and one or more of:   vanadium, and   balance of iron plus impurities.   
     
     
         3 . Alloy according to  claim 2 , wherein the alloy contains
 up to 5 wt % manganese,   up to 2 wt % copper,   up to 0.6 wt % nitrogen,   up to 5 wt % tungsten,   up to 3 wt % niobium,   up to 2 wt % cobalt, up to 0.2 wt % carbon,   up to 1 wt % tantalum,   up to 1 wt % titanium,   up to 1 wt % silicon,   up to 0.5 wt % aluminium,   up to 0.5 wt % vanadium, and   balance iron plus impurities.   
     
     
         4 . Alloy according to  claim 2 , wherein the sum of impurities is no greater than 0.1 wt %. 
     
     
         5 . Alloy according to  claim 1 , wherein the alloy contains at least 2 wt % iron. 
     
     
         6 . Alloy according to  claim 1 , wherein the alloy contains:
 (i) 42 to 48 wt % nickel,   (ii) 32 to 38 wt % chromium,   (iii) 4 to 11.5 wt % molybdenum,   (iv) 0.01 to 5 wt % manganese,   (v) 0.1 to 2 wt % copper,   (vi) 0.01 to 0.6 wt % nitrogen,   (vii) up to 2 wt % tungsten,   (viii) up to 1 wt % niobium,   (ix) up to 1.8 wt % cobalt,   (x) 0.002 to 0.2 wt % carbon,   (xi) up to 0.5 wt % tantalum,   (xii) up to 0.5 wt % titanium,   (xiii) 0.01 to 1 wt % silicon,   (xiv) 0.01 to 0.5 wt % aluminium,   (xv) 0.01 to 0.5 wt % vanadium.   
     
     
         7 . Alloy according to  claim 1 , wherein the alloy contains:
 (i) 43 to 47 wt % nickel,   (ii) 33 to 37 wt % chromium,   (iii) 4 to 11 wt % molybdenum,   (iv) 0.02 to 2 wt % manganese,   (v) 1 to 2 wt % copper,   (vi) 0.05 to 0.4 wt % nitrogen,   (vii) up to 1 wt % tungsten,   (viii) up to 0.2 wt % niobium,   (ix) up to 1.5 wt % cobalt,   (x) 0.005 to 0.1 wt % carbon,   (xi) up to 0.2 wt % tantalum,   (xii) up to 0.2 wt % titanium,   (xiii) 0.02 to 0.7 wt % silicon,   (xiv) 0.01 to 0.5 wt % aluminium,   (xv) 0.01 to 0.5 wt % vanadium.   
     
     
         8 . Alloy according to  claim 1 , wherein the alloy contains:
 (i) 43 to 46.5 wt % nickel,   (ii) 33.5 to 37 wt % chromium,   (iii) 4.5 to 10.5 wt % molybdenum,   (iv) 0.05 to 0.5 wt % manganese,   (v) 1.5 to 1.8 wt % copper,   (vi) 0.1 to 0.3 wt % nitrogen,   (vii) up to 0.5 wt % tungsten,   (viii) up to 0.05 wt % niobium,   (ix) up to 1 wt % cobalt,   (x) 0.01 to 0.02 wt % carbon,   (xi) up to 0.05 wt % tantalum,   (xii) up to 0.05 wt % titanium,   (xiii) 0.05 to 0.4 wt % silicon,   (xiv) 0.01 to 0.5 wt % aluminium,   (xv) 0,01 to 0.5 wt % vanadium.   
     
     
         9 . Alloy according to  claim 1 , wherein the alloy has a PREN value, calculated as wt % Cr+3.3*wt % Mo+16*wt % N, of at least 40. 
     
     
         10 . Alloy according to  claim 1 , wherein the alloy is austenitic. 
     
     
         11 . Alloy according to  claim 1 , wherein the alloy is characterized by one or more of:
 (a) an R p0.2  proof strength measured according to DIN EN 10 002-1:2001-12 of at least 300 MPa at 25° C.,   (b) an R p0.2  proof strength measured according to DIN EN 10 002-1:2001-12 of at least 250 MPa at 150° C.,   (c) an R m  ultimate tensile strength measured according to DIN EN 10 002-1:2001-12 of at least 450 MPa at 25° C., and   (d) an R m  ultimate tensile strength measured according to DIN EN 10 002-1:2001-12 of at least 400 MPa at 150° C., combined with one or more of   (e) a material loss measured according to ASTM G 28 A of at most 0.5 mm/year, and   (f) a material loss measured according to ASTM G 28 B of at most 2.5 mm/year.   
     
     
         12 . Article comprising an alloy according to  claim 1  selected from the group consisting of powders, granules, sheets, plates, bars, wires, pipes, cast products, wrought products, rolled products, forgings and welding materials. 
     
     
         13 . Article according to  claim 12  configured for applications in water with high salinity. 
     
     
         14 . Article according to  claim 1  selected from the group consisting of down-hole-headers, pipelines, tubes, valves, pumps and housings. 
     
     
         15 . (canceled) 
     
     
         16 . Alloy according to  claim 1 , further comprising up to 5 wt % manganese. 
     
     
         17 . Alloy according to  claim 1 , further comprising up to 2 wt % copper. 
     
     
         18 . Alloy according to  claim 1 , further comprising up to 0.6 wt % nitrogen. 
     
     
         19 . Alloy according to  claim 1 , further comprising up to 0.5 wt % aluminium. 
     
     
         20 . Alloy according to  claim 1 , further comprising up to 0.5 wt % vanadium. 
     
     
         21 . Alloy according to  claim 5 , wherein the alloy contains at least 4 wt % iron