US2004258554A1PendingUtilityA1
High-chromium nitrogen containing castable alloy
Priority: Jan 9, 2002Filed: Jan 30, 2004Published: Dec 23, 2004
Est. expiryJan 9, 2022(expired)· nominal 20-yr term from priority
Inventors:Roman Radon
C22C 38/58C22C 38/42C22C 38/02C22C 38/44C22C 38/52C22C 38/001C22C 38/54C22C 30/00
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Claims
Abstract
A corrosion and erosion resistant alloy comprising as mandatory elements besides iron, in % by weight, about 31 to about 48 chromium, about 0.01 to about 0.7 nitrogen, about 0.5 to about 30 manganese and about 0.3 to about 2.5 carbon. This abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A corrosion and erosion resistant alloy comprising, in % by weight:
from about 31 to about 48 chromium from about 0.01 to about 0.7 nitrogen from about 0.5 to about 30 manganese from about 0.3 to about 2.5 carbon from 0 to about 5 boron from 0 to about 6 molybdenum from 0 to about 5 silicon from 0 to about 8 copper from 0 to about 4 cobalt from 0 to about 25 nickel plus cobalt, said alloy further comprising from 0 to about 2% of each of zirconium, vanadium, cerium, titanium, tantalum, tungsten, niobium, aluminum, calcium and rare earth elements, the balance comprising iron and inevitable impurities, said alloy having a microstructure comprising chromium carbides, nitrides and optionally borides in an austenitic matrix, said matrix having a face centered cubic crystal structure and being supersaturated with nitrogen in solid solution form, the composition of the alloy satisfying the relationship: % Ni + % Co + 0.5 ( % Mn + % Cu ) + 30 ( % N + % C ) + 5 x % B % Cr + % Mo + % Si + 1.5 ( % Ti + % Ta + % V + % Nb + % Ce + % Al ) ≥ 1.5 .
2 . The alloy of claim 1 , wherein the alloy comprises of at least one of molybdenum, silicon, boron, copper and (nickel plus cobalt), each in an amount of at least about 0.01% by weight.
3 . The alloy of claim 1 , wherein the alloy comprises at least about 32% by weight of chromium.
4 . The alloy of claim 3 , wherein the alloy comprises of at least one of molybdenum, silicon, boron, copper and (nickel plus cobalt), each in an amount of at least about 0.01% by weight.
5 . A corrosion and erosion resistant alloy comprising, in % by weight:
from about 32 to about 34 chromium from about 0.35 to about 0.45 nitrogen from about 6 to about 9 manganese from about 0.5 to about 2.5 carbon from 0 to about 4.5 boron from 0 to about 5 molybdenum from 0 to about 3 silicon from 0 to about 4 copper from 0 to about 4 cobalt from 0 to about 4 nickel plus cobalt, said alloy further comprising 0 to about 2% of each of zirconium, vanadium, cerium, titanium, tantalum, tungsten, niobium, aluminum, calcium and rare earth elements, the balance comprising iron and inevitable impurities, said alloy having a microstructure comprising chromium carbides, nitrides and optionally borides in an austenitic matrix, said matrix having a face centered cubic crystal structure and being supersaturated with nitrogen in solid solution form, the composition of the alloy satisfying the relationship: % Ni + % Co + 0.5 ( % Mn + % Cu ) + 30 ( % N + % C ) + 5 x % B % Cr + % Mo + % Si + 1.5 ( % Ti + % Ta + % V + % Nb + % Ce + % Al ) ≥ 1.5 .
6 . The alloy of claim 5 , wherein the alloy comprises, in % by weight, one or more of the following:
from about 2 to about 5 molybdenum from about 0.5 to about 3 silicon from about 0.7 to about 4 copper from about 1.5 to about 4 nickel plus cobalt.
7 . The alloy of claim 6 , wherein the alloy comprises, in % by weight:
from about 2 to about 4 molybdenum from about 0.5 to about 2 silicon from about 0.7 to about 3 copper from about 1.5 to about 3 nickel plus cobalt.
8 . The alloy of claim 6 , wherein the alloy comprises at least about 0.01% by weight of boron.
9 . A corrosion and erosion resistant alloy comprising, in % by weight:
from about 35 to about 40 chromium from about 0.4 to about 0.6 nitrogen from about 4.5 to about 15 manganese from about 0.8 to about 1.6 carbon from 0 to about 5 boron from 0 to about 5 molybdenum from 0 to about 3 silicon from 0 to about 6 copper from 0 to about 4 cobalt from 0 to about 13 nickel plus cobalt, said alloy further comprising from 0 to about 2% of each of zirconium, vanadium, cerium, titanium, tantalum, tungsten, niobium, aluminum, calcium and rare earth elements, the balance comprising iron and inevitable impurities, said alloy having a microstructure comprising chromium carbides, nitrides and optionally borides in an austenitic matrix, said matrix having a face centered cubic crystal structure and being supersaturated with nitrogen in solid solution form, the composition of the alloy satisfying the relationship: % Ni + % Co + 0.5 ( % Mn + % Cu ) + 30 ( % N + % C ) + 5 x % B % Cr + % Mo + % Si + 1.5 ( % Ti + % Ta + % V + % Nb + % Ce + % Al ) ≥ 1.5 .
10 . The alloy of claim 9 , wherein the alloy comprises, in % by weight, one or more of the following:
from about 2 to about 4 molybdenum from about 0.5 to about 2 silicon from about 1 to about 4 copper from about 4 to about 13 nickel plus cobalt.
11 . The alloy of claim 9 , wherein the alloy comprises, in % by weight:
from about 0.9 to about 1.6 carbon from about 5 to about 13 manganese from about 2 to about 4 molybdenum from 0 to about 4.5 boron from about 0.5 to about 1.5 silicon from about 1 to about 3 copper from about 0.01 to about 4 cobalt from about 4 to about 12.5 nickel plus cobalt.
12 . The alloy of claim 10 , wherein the alloy comprises, in % by weight:
from about 1 to about 1.55 carbon from about 5 to about 12 manganese from about 2 to about 3.5 molybdenum from 0 to about 4 boron from about 0.6 to about 1.2 silicon from about 1 to about 2.5 copper from about 0.02 to about 4 cobalt from about 4 to about 12 nickel plus cobalt.
13 . The alloy of claim 1 , which exhibits a PREN of from 58 to 66.
14 . The alloy of claim 11 , which exhibits a PREN of from 58 to 66.
15 . The alloy of claim 13 , wherein the matrix comprises from about 0.25% to about 0.45% by weight of nitrogen in solid solution form.
16 . The alloy of claim 1 , wherein the alloy comprises, in % by weight:
from about 41 to about 48 chromium from about 0.45 to about 0.7 nitrogen from about 6 to about 30 manganese from about 0.9 to about 1.5 carbon from 0 to about 3.5 boron from 0 to about 4 molybdenum from 0 to about 3 silicon from 0 to about 8 copper from 0 to about 25 nickel plus cobalt, the balance comprising iron and inevitable impurities.
17 . The alloy of claim 16 , wherein the alloy comprises of at least one of molybdenum, silicon, boron, copper and (nickel plus cobalt), each in an amount of at least about 0.01% by weight.
18 . The alloy of claim 17 , wherein the alloy comprises, in % by weight, one or more of the following:
from about 1 to about 4 molybdenum from about 0.5 to about 3 silicon from about 1 to about 8 copper from about 10 to about 25 nickel plus cobalt.
19 . The alloy of claim 18 , wherein a PREN is from 51 to 72.
20 . The alloy of claim 16 , wherein the matrix comprises from about 0.25% to about 0.45% by weight of nitrogen in solid solution form.
21 . A casting which comprises the alloy of claim 1 .
22 . A casting which comprises the alloy of claim 12 .
23 . A part of a slurry pump which comprises the alloy of claim 1 .
24 . The part of claim 23 , wherein the part comprises one of a casing, impeller, suction liner, pipe, nozzle, agitator and a valve blade.Join the waitlist — get patent alerts
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