US2528867A - Production of thermally hardenable boron-titanium steels - Google Patents

Production of thermally hardenable boron-titanium steels Download PDF

Info

Publication number
US2528867A
US2528867A US35733A US3573348A US2528867A US 2528867 A US2528867 A US 2528867A US 35733 A US35733 A US 35733A US 3573348 A US3573348 A US 3573348A US 2528867 A US2528867 A US 2528867A
Authority
US
United States
Prior art keywords
boron
steels
titanium
production
thermally hardenable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US35733A
Inventor
Maurice J Day
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carnegie Illinois Steel Corp
Original Assignee
Carnegie Illinois Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carnegie Illinois Steel Corp filed Critical Carnegie Illinois Steel Corp
Priority to US35733A priority Critical patent/US2528867A/en
Application granted granted Critical
Publication of US2528867A publication Critical patent/US2528867A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Definitions

  • boron additions to steels produced in open hearth furnaces provide the desired increase in hardenability.
  • boron additions make little, if any, change in this property of steels produced in electric furnaces.
  • this difference in response to boron is due to the nitrogen content and that steels containing no more than .006% nitrogen will respond effectively to boron additions.
  • steels containing over .006% nitrogen may be rendered very responsive to improvement in hardenability by boron additions by adding at least .02% titanium to the molten steel prior to or simultaneously With the boron.
  • the nitrogen content may use as high as .02% or higher.
  • the titanium should be added in amounts at least five times the amount the nitrogen content exceeds .006%.
  • the nitrogen content exceeds .006%.
  • titanium for a steel containing .02% nitrogen about .07% titanium should be added, which is five Hardenability factor for boron calculated to be 1.71 which is a satisfactory performance for boron.
  • the method of improving the efficiency of boron additions to thermally hardenable steels containing over .006% nitrogen comprising adding at least .02% titanium to the molten steel prior to adding the boron, the titanium addition being at least five times the amount the nitrogen content exceeds .006%.

Description

Patented Nov. 7, 1950 UNITED STATES PATENT OFFICE PRODUCTION OF THERMALLY HARDENABLE BORON-TITANIUM STEELS Maurice J. Day, Oak Park, Ill., assignor to Carnegie-Illinois Steel Corporation, a corporation of New Jersey No Drawing. Application June 28, 1948, Serial No. 35,733
2 times the amount which the nitrogen exceeds .006% or 5 .01e%.
The efiiciency of such additions can be readily seen from the following tabulation based on steels having otherwise similar composition, except for boron and titanium. The hardenability factor clearly shows the effectiveness of the titanium.
EXAMPLE I Steel Ahigh nitrogen Mn P S Ni Cr M0 V B N Ti 1. 92 77 .30 ()3 0024 011 None due to its greater effectiveness therein but may be and frequently is added to steels containing up to .90% carbon. However, even in the case of the low carbon steels, the effect of the boron additions varies widely, i. e., boron additions will Hardenability for boron calculated to be 1.04 Where 1.00 is equivalent to no effect of boron.
EXAMPLE II Steel B-high nitrogen '0 Mn P S Ni Cr Mo V -B N Ti remarkably increase the hardenability of one steel and have little or no effect on steels of generally similar composition.
It is accordingly an object of this invention to provide a uniform increase in hardenability by boron additions to thermally hardenable steels.
It is a further object to obtain maximum eniciency from boron additions to thermally hardenable steels.
It has heretofore been noted by a number of metallurgists that boron additions to steels produced in open hearth furnaces provide the desired increase in hardenability. However, boron additions make little, if any, change in this property of steels produced in electric furnaces. I have discovered that this difference in response to boron is due to the nitrogen content and that steels containing no more than .006% nitrogen will respond effectively to boron additions. I have further discovered that steels containing over .006% nitrogen may be rendered very responsive to improvement in hardenability by boron additions by adding at least .02% titanium to the molten steel prior to or simultaneously With the boron. In electric furnace steels, the nitrogen content may use as high as .02% or higher. To obtain the maximum efficiency from the titanium and boron additions to steel containing large amounts of nitrogen, the titanium should be added in amounts at least five times the amount the nitrogen content exceeds .006%. Thus for a steel containing .02% nitrogen about .07% titanium should be added, which is five Hardenability factor for boron calculated to be 1.71 which is a satisfactory performance for boron.
I claim:
The method of improving the efficiency of boron additions to thermally hardenable steels containing over .006% nitrogen comprising adding at least .02% titanium to the molten steel prior to adding the boron, the titanium addition being at least five times the amount the nitrogen content exceeds .006%.
MAURICE J. DAY.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Name Date Crafts Apr. 21, 1942 OTHER REFERENCES Number
US35733A 1948-06-28 1948-06-28 Production of thermally hardenable boron-titanium steels Expired - Lifetime US2528867A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US35733A US2528867A (en) 1948-06-28 1948-06-28 Production of thermally hardenable boron-titanium steels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US35733A US2528867A (en) 1948-06-28 1948-06-28 Production of thermally hardenable boron-titanium steels

Publications (1)

Publication Number Publication Date
US2528867A true US2528867A (en) 1950-11-07

Family

ID=21884475

Family Applications (1)

Application Number Title Priority Date Filing Date
US35733A Expired - Lifetime US2528867A (en) 1948-06-28 1948-06-28 Production of thermally hardenable boron-titanium steels

Country Status (1)

Country Link
US (1) US2528867A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2586041A (en) * 1951-04-06 1952-02-19 United States Steel Corp Low-alloy, high-hardenability steel with high toughness at high hardness levels
US2586042A (en) * 1951-04-06 1952-02-19 United States Steel Corp Low-alloy high-yield strength weldable steel
US2617725A (en) * 1950-10-07 1952-11-11 Hugh P Owens Alloy metals for use in dental castings
US2755181A (en) * 1952-10-09 1956-07-17 Air Liquide Process of introducing boron into ferrous metal
US2861908A (en) * 1955-11-30 1958-11-25 American Steel Foundries Alloy steel and method of making
US2872180A (en) * 1957-02-25 1959-02-03 A J Boynton & Co Apparatus for adding solid material to molten metal
US3155549A (en) * 1961-03-11 1964-11-03 Ishikawajima Harima Heavy Ind Steel for high temperature cementation
US3647426A (en) * 1966-07-12 1972-03-07 Xavier Wache Processes for the production of iron-nickel alloys having a high-nickel content
US3717508A (en) * 1970-11-04 1973-02-20 Bethlehem Steel Corp Method of improving stability of boron hardenability effect in alloy steels
US3791818A (en) * 1972-08-14 1974-02-12 Us Air Force Steel alloy
EP0012226A1 (en) * 1978-11-17 1980-06-25 Concast Holding Ag Method for treating boron-containing steel
US4536215A (en) * 1984-12-10 1985-08-20 Gte Products Corporation Boron addition to alloys

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2280283A (en) * 1940-01-05 1942-04-21 Electro Metallurg Co Deep-hardening boron steels

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2280283A (en) * 1940-01-05 1942-04-21 Electro Metallurg Co Deep-hardening boron steels

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2617725A (en) * 1950-10-07 1952-11-11 Hugh P Owens Alloy metals for use in dental castings
US2586041A (en) * 1951-04-06 1952-02-19 United States Steel Corp Low-alloy, high-hardenability steel with high toughness at high hardness levels
US2586042A (en) * 1951-04-06 1952-02-19 United States Steel Corp Low-alloy high-yield strength weldable steel
US2755181A (en) * 1952-10-09 1956-07-17 Air Liquide Process of introducing boron into ferrous metal
US2861908A (en) * 1955-11-30 1958-11-25 American Steel Foundries Alloy steel and method of making
US2872180A (en) * 1957-02-25 1959-02-03 A J Boynton & Co Apparatus for adding solid material to molten metal
US3155549A (en) * 1961-03-11 1964-11-03 Ishikawajima Harima Heavy Ind Steel for high temperature cementation
US3647426A (en) * 1966-07-12 1972-03-07 Xavier Wache Processes for the production of iron-nickel alloys having a high-nickel content
US3717508A (en) * 1970-11-04 1973-02-20 Bethlehem Steel Corp Method of improving stability of boron hardenability effect in alloy steels
US3791818A (en) * 1972-08-14 1974-02-12 Us Air Force Steel alloy
EP0012226A1 (en) * 1978-11-17 1980-06-25 Concast Holding Ag Method for treating boron-containing steel
US4536215A (en) * 1984-12-10 1985-08-20 Gte Products Corporation Boron addition to alloys

Similar Documents

Publication Publication Date Title
US2528867A (en) Production of thermally hardenable boron-titanium steels
US3251682A (en) Low-alloy tough steel
US2051415A (en) Heat treated alloy steel
US2747989A (en) Ferritic alloys
US2880085A (en) Ferritic alloy steels for use at elevated temperatures
US2542220A (en) Ferritic alloy
ES317692A1 (en) Improvements introduced in the manufacture of steels to the chrome-nickel, which can be tempered by precipitation. (Machine-translation by Google Translate, not legally binding)
US3244514A (en) Alloy steels and articles made thereof
US3169857A (en) Free machining steel with improved hot workability
US2513935A (en) Alloy steels
GB517118A (en) Improvements in and relating to improved steels and the application thereof
US2978319A (en) High strength, low alloy steels
US1357549A (en) Apparatus for high-temperature uses
US3068095A (en) Alloy steels
US2919188A (en) High strength alloy steels
US1959398A (en) Steel
US2227891A (en) Ferrous alloy
JPS5911656B2 (en) High hardness wear-resistant cast iron
US3260594A (en) High temperature alloys
US2835571A (en) Steel for use at elevated temperature
US2501215A (en) High-silicon cast iron
US2390594A (en) Heat-resistant cast iron
FR2287519A1 (en) Weldable structural steel - which is resistant to embrittlement in the heat affected zone
US2128601A (en) Method of manufacturing alloy steel
US3432290A (en) Ferrous material