US3856516A - Low creep high strength ferrous alloy - Google Patents

Low creep high strength ferrous alloy Download PDF

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Publication number
US3856516A
US3856516A US00011001A US1100170A US3856516A US 3856516 A US3856516 A US 3856516A US 00011001 A US00011001 A US 00011001A US 1100170 A US1100170 A US 1100170A US 3856516 A US3856516 A US 3856516A
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United States
Prior art keywords
high strength
low creep
alloy
sulfur
elevated temperatures
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Expired - Lifetime
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US00011001A
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R English
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Blair Knox Co
Blaw Knox Co
Blaw Knox Corp
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Blair Knox Co
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Priority to US00011001A priority Critical patent/US3856516A/en
Priority to CA104801A priority patent/CA928104A/en
Priority to DE2106506A priority patent/DE2106506C3/en
Priority to FR7104666A priority patent/FR2078500A5/fr
Priority to JP46005639A priority patent/JPS515610B1/ja
Priority to GB21721/71A priority patent/GB1285424A/en
Application granted granted Critical
Publication of US3856516A publication Critical patent/US3856516A/en
Assigned to WHITE CONSOLIDATED INDUSTRIES, INC. reassignment WHITE CONSOLIDATED INDUSTRIES, INC. MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE DEC. 26, 1978 DISTRICT OF COLUMBIA Assignors: ATHENS STOVE WORKS, INC., BLAW-KNOX COMPANY, BULLARD COMPANY THE, DURALOY BLAW-KNOX, INC., FAYSCOTT, INC., GIBSON PRODUCTS CORPORATION, HUPP, INC., JERGUSON GAGE & VALVE COMPANY, KELIVINATOR INTERNATIONAL CORPORATION, KELVINATOR COMMERCIAL PRODUCTS, INC., KELVINATOR, INC., R-P & C VALVE, INC., WHITE SEWING MACHINE COMPANY, WHITE-SUNDSTRAND MACHINE TOOL, INC., WHITE-WESTINGHOUSE CORPORATION
Assigned to BLAW-KNOX COMPANY reassignment BLAW-KNOX COMPANY MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE DEC. 26, 1978. DELAWARE Assignors: AETNA-STANDARD ENGINEERING COMPANY, BLAW-KNOX CONSTRUCTION EQUIPMENT, INC.,, BLAW-KNOX EQUIPMENT, INC., BLAW-KNOX FOOD & CHEMICAL EQUIPMENT, INC., BLAW-KNOX FOUNDRY & MILL MACHINERY, INC., COPES-VULCAN, INC.
Assigned to BLAW KNOX CORPORATION, A CORP OF DELAWARE reassignment BLAW KNOX CORPORATION, A CORP OF DELAWARE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WHITE CONSOLIDATED INDUSTRIES, INC., A CORP OF DE.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten

Definitions

  • Alloy C Mn Si Ni Cr W S Bal Alloy 1 Fe usual impurities Alloy 11 Fe usual impurities Alloy l is a recognized high temperature alloy having extraordinary stress rupture characteristics as compared with most alloys. It is sold by Blaw-Knox Company under the trade mark Mo Re No. 1 for high temperature and high stress application.
  • Alloy 11 is a composition according to the present invention.
  • test piece formed from Alloy No. 1 developed hours of life.
  • test piece formed from Alloy No. 2 developed 883 hours of life, or almost 9 times the life of the best alloy heretofore available for high temperature high stress applications. This is a very surprising result.
  • a low creep, high strength alloy resistant to corro sion and thermal shock at elevated temperatures and having unusual stress rupture characteristics at elevated temperatures consisting essentially of about 0.3% to 0.9% carbon, about 20% to 30% chromium, about to 35% nickel, about 0.8% to 4% manganese, about 0.9% to 3.5% silicon, about 0.3% to 5% tungsten, about 0.030% to about 0.15% sulfur and the balance iron with residual impurities in ordinary amounts.
  • a low creep, high strength alloy resistant to corrosion and thermal shock at elevated temperatures having unusual stress rupture characteristics at elevated temperatures consisting essentially of about 0.35% to 0.75% carbon, about 20% to 30% chromium, about 30% to 35% nickel, about 1.2% "to 2.4% manganese, about 1.2% to 2.5% silicon, about 1.75%% to 5% tungsten, about 0.035% to 0.10% sulfur and the balance iron with residual impurities in ordinary amounts.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Continuous Casting (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

A new alloy is provided having low creep and high strength at elevated temperatures which is resistant to corrosion and thermal shock and has unusual stress rupture characteristics at elevated temperatures comprising about 0.3% to 0.9% carbon, about 20% to 30% chromium, about 15% to 35% nickel, about 0.8% to 4% manganese, about 0.9% to 3.5% silicon, about 0.3% to 5% tungsten, about 0.03% to 0.15% sulfur and the balance iron with residual impurities in ordinary amounts.

Description

United States Patent English Dec. 24, 1974 LOW CREEP HIGH STRENGTH FERROUS 3,165,400 l/l965 Roy 75/128 A ALLOY 3,260,594 7/1966 Ornitz 75/1211 A 3,376,780 4/1968 Tanczyn 75/l28 P Inventor: y g McCandless 3,563,729 2/1071 Kovach H 75/1211 P Township, Allegheny County, Pa. [73] Assignee: Blair-Knox Company, Pittsburgh, Primary B1101 p Attorney, Agent, or FirmBuell, Blenko and Ziesenheim [22] F1led: Feb. 12, 1970 [21] Appl. No: 11,001 [57] ABSTRACT A new alloy is provided having low creep and high [5 US Cl- 5/1 8 A, 75/128 P strength at elevated temperatures which is resistant to [51] Int. Cl. C22c 39/20 corrosion and thermal shock and has unusual stress [58] Field of Search 75/128 A, 128 W, 128 P rupture characteristics at elevated temperatures comprising about 0.3% to 0.9% carbon, about to [56] References Cited chromium, about 15% to nickel, about 0.8% to UNITED STATES PATENTS 4% manganese, about 0.9% to 3.5% silicon, about 2557 862 6/1951 Clarke /128 P 0.3% to 5% tungsten, about 0.03% to 0.15% sulfur 2:677:610 5/1954 75/128 P and the balance iron with residual impurities in ordi- 2,686,116 8/1954 Schempp 75/128 F y amounts- Tanczyn 75/128 W 3 Claims, No Drawings Balass .1 75/128 W 7 LOW CREEP HIGH STRENGTH FERROUS ALLOY This invention relates to high temperature alloys and particularly to an alloy and parts made therefrom having high strength and low creep in the temperature range l,600 to 2,200F. coupled with resistance to corrosion and thermal shock. The need for alloys having high strength and low creep, coupled with resistance to corrosion and thermal shock in the temperature range of 2,000 F., has long been recognized. Conventional alloys used for applications in this temperature range have not been satisfactory for most uses because of the high rate of creep, corrosion and lack of strength at temperatures at or about 1,600 to 2,200 F.
l have discovered an alloy composition having high strength and low creep characteristics coupled with corrosion resistance and high resistance to thermal shock at temperatures of about l,600 to 2,200 P. The surprising characteristics of this alloy appear to be particularly dependent upon the control of carbon, manganese, tungsten and sulfur within a critical nickelchromium iron base analysis. The broad composition range of the alloy of this invention lies within the following limits:
Sulfur about 0.030 to about 0.15% Carbon about 0.3% to about 0.9% Chromium about 17% to about 30% Nickel about to about 35% Manganese about 0.8% to about 4% Silicon about 0.9% to about 3.5% Tungsten about 0.3% to about 5 Balance iron with residual impurities in ordinary amounts While the foregoing broad alloy composition will give generally satisfactory results at or above 1,800 F., I have found that for continued service above about 2,100 F. the following narrower range of composition should be observed:
Sulfur about 0.035 to about 0.100% Carbon about 0.35% to about 0.75% Chromium about 20% to about 30% Nickel about 30% to about 35% Manganese about 1.2% to about 2.4% Silicon about 1.2% to about 2.5% Tungsten about 1.75% to about 5% Balance iron with residual impurities in ordinary amounts A single preferred composition would be:
Sulfur about 0.075%
Carbon about 0.4%
Chromium about 23% Nickel about 30% Manganese about 1.5%
Silicon about 2% Tungsten about 1.75%
Balance iron with residual impurities in ordinary amounts This invention is surprising in that the high sulfur in the present alloy composition appears to act precisely contrary to what would be expected. It has long been recognized that the presence of sulfur above about 0.025% in steels or iron based alloys would cause red shortness and the strength and resistance to cracking at high temperatures, particularly when worked or loaded, was drastically reduced. In the present alloy, on
EXAMPLE Two alloys were melted having the following compo sitions:
Alloy C Mn Si Ni Cr W S Bal Alloy 1 Fe usual impurities Alloy 11 Fe usual impurities Alloy l is a recognized high temperature alloy having extraordinary stress rupture characteristics as compared with most alloys. It is sold by Blaw-Knox Company under the trade mark Mo Re No. 1 for high temperature and high stress application.
Alloy 11 is a composition according to the present invention.
These two alloys were formed into identical test pieces and subjected to stress rupture tests at 1,900" P. and 3,400 lbs. of stress under identical conditions.
The test piece formed from Alloy No. 1 developed hours of life. I
The test piece formed from Alloy No. 2 developed 883 hours of life, or almost 9 times the life of the best alloy heretofore available for high temperature high stress applications. This is a very surprising result.
The reason for this surprising result is not known to me. I believe, however, that it is the result of a redistribution of carbides in the matrix due to the presence of the sulfur in this particular alloy composition. It may,
of course, be the result of the formation of a complex sulfur metal carbide composition. Whatever the mechanism, it is most unique and surprising result.
While I have described certain preferred embodiments of my invention in the foregoing specification, it will be understood that the invention may be otherwise embodied with the scope of the following claims.
1 claim:
1. A low creep, high strength alloy resistant to corro sion and thermal shock at elevated temperatures and having unusual stress rupture characteristics at elevated temperatures consisting essentially of about 0.3% to 0.9% carbon, about 20% to 30% chromium, about to 35% nickel, about 0.8% to 4% manganese, about 0.9% to 3.5% silicon, about 0.3% to 5% tungsten, about 0.030% to about 0.15% sulfur and the balance iron with residual impurities in ordinary amounts.
2. A low creep, high strength alloy resistant to corrosion and thermal shock at elevated temperatures having unusual stress rupture characteristics at elevated temperatures consisting essentially of about 0.35% to 0.75% carbon, about 20% to 30% chromium, about 30% to 35% nickel, about 1.2% "to 2.4% manganese, about 1.2% to 2.5% silicon, about 1.75%% to 5% tungsten, about 0.035% to 0.10% sulfur and the balance iron with residual impurities in ordinary amounts.
3. A low creep, high stre gth alloy resistant to corro- I manganese, about 2% siliim, about 1.75% tungsten, sion and thermal shock at temperatures of 1,600 to about 0.075% sulfur and the balance iron with residual 2,200 F. consisting essentially of about 0.4% carbon, impurities in ordinary amounts. about 23% chromium, about 30% nickel, about 1.5% 5
UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patmn:No.3 85 5 ImtedDecpmber 24, 1974 Invmmorkfi Ray H. English It is certified that error appears in the above-identified patent and that said Letters Patent'are hereby corrected as shown below:
The name of the Assignee should read:
"BLAW-KNOX COMPANY" Column 2, line 65, "l.75%%" should read l.75%.
Signed and sealed this 4th day of March 1975.
(SEAL) Attest:
C. MARSHALL DANN RUTH C. MASON Commissioner of Patents Attesting Officer and Trademarks usco'MM-Dc 60376 P69 1* I145. GOVERNMENT PRINTNG OFFICE I!" 0-3'6-3 l.
F ORM PO-\ 050 (10-69)

Claims (3)

1. A LOW CREEP, HIGH STRENGTH ALLOY RESISTANT TO CORROSION AND THERMAL SHOCK AT ELEVATED TEMPERATURES AND HAVING UNUSUAL STRESS REPTURE CHARACTERISTICS AT ELEVATED TEMPERATURES CONSISTING ESSENTIALLY OF ABOUT 0.3% TO 0.9% CARBON, ABOUT 20% TO 30% CHROMIUM, ABOUT 15% TO 35% NICKEL, ABOUT 0.8% TO 4% MANGANESE, ABOUT 0.9% TO 3.5% SILICON, ABOUT 0.3% TO 5% TUNGSTEN, ABOUT 0.030% TO ABOUT 0.15% SULFUR AND THE BALANCE IRON WITH RESIDUAL IMPURITIES IN ORDINARY AMOUNTS.
2. A low creep, high strength alloy resistant to corrosion and thermal shock at elevated temperatures having unusual stress rupture characteristics at elevated temperatures consisting essentially of about 0.35% to 0.75% carbon, about 20% to 30% chromium, about 30% to 35% nickel, about 1.2% to 2.4% manganese, about 1.2% to 2.5% silicon, about 1.75%% to 5% tungsten, about 0.035% to 0.10% sulfur and the balance iron with residual impurities in ordinary amounts.
3. A low creep, high strength alloy resistant to corrosion and thermal shock at temperatures of 1,600* to 2,200* F. consisting essentially of about 0.4% carbon, about 23% chromium, about 30% nickel, about 1.5% manganese, about 2% silicon, about 1.75% tungsten, about 0.075% sulfur and the balance iron with residual impurities in ordinary amounts.
US00011001A 1970-02-12 1970-02-12 Low creep high strength ferrous alloy Expired - Lifetime US3856516A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00011001A US3856516A (en) 1970-02-12 1970-02-12 Low creep high strength ferrous alloy
CA104801A CA928104A (en) 1970-02-12 1971-02-08 High temperature alloys
FR7104666A FR2078500A5 (en) 1970-02-12 1971-02-11
DE2106506A DE2106506C3 (en) 1970-02-12 1971-02-11 Use of a chrome-nickel steel for the manufacture of components
JP46005639A JPS515610B1 (en) 1970-02-12 1971-02-12
GB21721/71A GB1285424A (en) 1970-02-12 1971-04-19 High temperature alloy

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Application Number Priority Date Filing Date Title
US00011001A US3856516A (en) 1970-02-12 1970-02-12 Low creep high strength ferrous alloy

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US3856516A true US3856516A (en) 1974-12-24

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JP (1) JPS515610B1 (en)
CA (1) CA928104A (en)
DE (1) DE2106506C3 (en)
FR (1) FR2078500A5 (en)
GB (1) GB1285424A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4329173A (en) * 1980-03-31 1982-05-11 Carondelet Foundry Company Alloy resistant to corrosion
US4505232A (en) * 1983-03-28 1985-03-19 Hitachi, Ltd. Boiler tube

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2557862A (en) * 1947-11-19 1951-06-19 Armco Steel Corp Internal-combustion engine valve
US2677610A (en) * 1951-10-24 1954-05-04 Universal Cyclops Steel Corp High temperature alloy steel and articles made therefrom
US2686116A (en) * 1952-06-18 1954-08-10 Crucible Steel Company Age hardening austenitic steel
US2984563A (en) * 1957-12-18 1961-05-16 Tanczyn Harry Stainless steel and method
US3115406A (en) * 1960-10-21 1963-12-24 Gen Dynamics Corp Low alloy steel welding wire
US3165400A (en) * 1961-06-27 1965-01-12 Chrysler Corp Castable heat resisting iron alloy
US3260594A (en) * 1965-01-11 1966-07-12 Blaw Knox Co High temperature alloys
US3376780A (en) * 1966-09-19 1968-04-09 Armco Steel Corp Stainless steel, products and method
US3563729A (en) * 1968-04-16 1971-02-16 Crucible Inc Free-machining corrosion-resistant stainless steel

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2557862A (en) * 1947-11-19 1951-06-19 Armco Steel Corp Internal-combustion engine valve
US2677610A (en) * 1951-10-24 1954-05-04 Universal Cyclops Steel Corp High temperature alloy steel and articles made therefrom
US2686116A (en) * 1952-06-18 1954-08-10 Crucible Steel Company Age hardening austenitic steel
US2984563A (en) * 1957-12-18 1961-05-16 Tanczyn Harry Stainless steel and method
US3115406A (en) * 1960-10-21 1963-12-24 Gen Dynamics Corp Low alloy steel welding wire
US3165400A (en) * 1961-06-27 1965-01-12 Chrysler Corp Castable heat resisting iron alloy
US3260594A (en) * 1965-01-11 1966-07-12 Blaw Knox Co High temperature alloys
US3376780A (en) * 1966-09-19 1968-04-09 Armco Steel Corp Stainless steel, products and method
US3563729A (en) * 1968-04-16 1971-02-16 Crucible Inc Free-machining corrosion-resistant stainless steel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4329173A (en) * 1980-03-31 1982-05-11 Carondelet Foundry Company Alloy resistant to corrosion
US4505232A (en) * 1983-03-28 1985-03-19 Hitachi, Ltd. Boiler tube

Also Published As

Publication number Publication date
DE2106506C3 (en) 1975-05-28
CA928104A (en) 1973-06-12
FR2078500A5 (en) 1971-11-05
DE2106506A1 (en) 1972-02-03
JPS515610B1 (en) 1976-02-21
GB1285424A (en) 1972-08-16
DE2106506B2 (en) 1974-02-14

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AS Assignment

Owner name: BLAW-KNOX COMPANY

Free format text: MERGER;ASSIGNORS:AETNA-STANDARD ENGINEERING COMPANY;BLAW-KNOX CONSTRUCTION EQUIPMENT, INC.,;BLAW-KNOX EQUIPMENT, INC.;AND OTHERS;REEL/FRAME:003926/0382

Effective date: 19781221

Owner name: WHITE CONSOLIDATED INDUSTRIES, INC.

Free format text: MERGER;ASSIGNORS:BLAW-KNOX COMPANY;KELVINATOR, INC.;WHITE-WESTINGHOUSE CORPORATION;AND OTHERS;REEL/FRAME:003926/0372

Effective date: 19781221

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Owner name: BLAW KNOX CORPORATION, ONE OLIVER PLAZA, PITTSBURG

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE SEPT. 27, 1985;ASSIGNOR:WHITE CONSOLIDATED INDUSTRIES, INC., A CORP OF DE.;REEL/FRAME:004532/0913

Effective date: 19851017