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US4873055A Expired / Lapsed US ⏱️ 0.0 years remaining

Corrosion resistant Fe-Ni-Cr alloy

Assignee: Carondelet Foundry Co
•
Filing: 1988-12-20
•
Granted: 1989-10-10
•
Expires: 2008-12-20
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Abstract

Abstract This invention relates to alloys resistant to corrosion, and especially resistant to corrosion caused by contact with hot sulfuric acid of over 98% concentration. The alloys of the invention consist essentially by weight percentages of from about 19% to about 30% by weight Ni, from about 19% to about 27% by weight Cr, from about 0.3% to about 1.0% by weight Mo, from about 2.7% to 4.5% by weight Cu, from about 2.7% to about 4.7% by weight Mn, from about 2.45% to about 5.5% by weight Si, from about up to about 0.08% C by weight, and the balance essentially iron. The alloys may optionally contain up to 0.7% Cb partially replaced by up to 1% Ta, up to 0.6% W, up to 0.12% N and up to 0.8% Co, all by weight.

Inventors

  • 👤 John H. Culling

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 05:50
CPC Classifications
C; C22; C22C; C22C30/00

Claims Analysis

Total Claims: 15
Claim 1
Independent Claim 68 words
An alloy consisting essentially of ______________________________________ Nickel 19-30% by weight Chromium 19-27% Molybdenum 0.3-1% Copper 2.7-4.5% Manganese 2.7-4.7% Silicon 2.7-5.5% Carbon up to about 0.08% Columbium up to about 0.7% Tantalum up to about 1% substituted for part of Cb at the rate of 1% Ta = 0.5% Cb Nitrogen up to about 0.12% Tungsten up to about 0.6% Cobalt up to about 0.8% Iron essentially balance ______________________________________
Claim 2
Dependent Claim 68 words
An alloy consisting essentially of ______________________________________ Nickel 19-30% by weight Chromium 19-27% Molybdenum 0.3-1% Copper 2.7-4.5% Manganese 2.7-4.7% Silicon 2.7-5.5% Carbon up to about 0.08% Columbium up to about 0.7% Tantalum up to about 1% substituted for part of Cb at the rate of 1% Ta = 0.5% Cb Nitrogen up to about 0.12% Tungsten up to about 0.6% Cobalt up to about 0.8% Iron essentially balance ______________________________________
Claim 3
Dependent Claim 29 words
An alloy of claim 1 containing ______________________________________ Nickel 27.0% Chromium 24.0% Molybdenum 0.99% Copper 3.1% Manganese 3.7% Silicon 4.3% Carbon 0.01% Columbium 0.43% Tungsten 0.31% Iron essentially balance ______________________________________
Claim 4
Dependent Claim 35 words
An alloy of claim 1, consisting essentially of ______________________________________ Nickel (including Cobalt) 20-29% Chromium 20-26% Molybdenum 0.3-0.95% Copper 2.7-4.2% Manganese 2.7-4.1% Silicon 2.45-5.0% Carbon 0-0.05% Columbium 0-0.7% Nitrogen 0-0.12% Tungsten 0-0.6% Iron essentially balance ______________________________________
Claim 5
Dependent Claim 36 words
An alloy of claim 3, consisting essentially of ______________________________________ Nickel (including Cobalt) 20-14 25.5% Chromium 20-25.5% Molybdenum 0.3-0.7% Copper 2.75-3.6% Manganese 2.7-4.1% Silicon 2.45-4.85% Carbon 0-0.05% Columbium 0-0.65% Nitrogen 0-0.08% Tungsten 0-0.35% Iron essentially balance ______________________________________
Claim 6
Dependent Claim 29 words
An alloy of claim 3 containing ______________________________________ Nickel 24.7% Chromium 20.2% Molybdenum 0.53% Copper 2.8% Manganese 2.8% Silicon 4.9% Carbon 0.01% Columbium 0.36% Tungsten 0.32% Iron essentially balance ______________________________________
Claim 7
Dependent Claim 29 words
An alloy of claim 4 containing ______________________________________ Nickel 25% Chromium 20% Molybdenum 0.55% Copper 2.80% Manganese 2.75% Silicon 4.85% Carbon 0.03% Columbium 0.35% Tungsten 0.30% Iron essentially balance ______________________________________
Claim 8
Dependent Claim 25 words
An alloy of claim 3 containing ______________________________________ Nickel 22.1% Chromium 23.0% Molybdenum 0.77% Copper 3.5% Manganese 3.8% Silicon 2.6% Carbon 0.05% Iron essentially balance ______________________________________
Claim 9
Dependent Claim 25 words
An alloy of claim 4 containing ______________________________________ Nickel 20.3% Chromium 20.6% Molybdenum 0.45% Copper 3% Manganese 4% Silicon 3% Columbium 0.01% Iron essentially balance ______________________________________
Claim 10
Dependent Claim 25 words
An alloy of claim 4 containing ______________________________________ Nickel 20.5% Chromium 20.5% Molybdenum 0.45% Copper 3% Manganese 4% Silicon 3% Carbon 0.03% Iron essentially balance ______________________________________
Claim 11
Dependent Claim 27 words
An alloy of claim 4 containing ______________________________________ Nickel 20.6% Chromium 24.1% Molybdenum 0.33% Copper 3.5% Manganese 3.6% Silicon 2.5% Carbon 0.02% Columbium 0.63% Iron essentially balance ______________________________________
Claim 12
Dependent Claim 27 words
An alloy of claim 4 containing ______________________________________ Nickel 20.5% Chromium 24% Molybdenum 0.35% Copper 3.5% Manganese 3.5% Silicon 2.5% Carbon 0.03% Columbium 0.06% Iron essentially balance ______________________________________
Claim 13
Dependent Claim 25 words
An alloy of claim 4 containing ______________________________________ Nickel 24.70% Chromium 24.9% Molybdenum 0.55% Copper 3.5% Manganese 4.0% Silicon 3.5% Columbium 0.62% Iron essentially balance ______________________________________
Claim 14
Dependent Claim 25 words
An alloy of claim 4 containing ______________________________________ Nickel 24% Chromium 25% Molybdenum 0.55% Copper 3.5% Manganese 4.0% Silicon 3.0% Carbon 0.03% Iron essentially balance ______________________________________
Claim 15
Dependent Claim 25 words
An alloy of claim 4 containing ______________________________________ Nickel 20.2% Chromium 22.3% Molybdenum 0.39% Copper 3.5% Manganese 3.8% Silicon 2.7% Carbon 0.02% Iron essentially balance ______________________________________

References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-10-09 1993-04-10 1993-10-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-10-09 1997-04-10 1997-10-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-10-09 2001-04-10 2001-10-10 $7700.00 Window Closed / Lapsed

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