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

Production of thermally hardenable boron-titanium steels Download PDF

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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
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boron
steels
titanium
production
thermally hardenable
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US35733A
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Maurice J Day
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Carnegie Illinois Steel Corp
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Carnegie Illinois Steel Corp
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60

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)

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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

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