US3158913A - Method of treating steel - Google Patents

Method of treating steel Download PDF

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Publication number
US3158913A
US3158913A US124316A US12431661A US3158913A US 3158913 A US3158913 A US 3158913A US 124316 A US124316 A US 124316A US 12431661 A US12431661 A US 12431661A US 3158913 A US3158913 A US 3158913A
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United States
Prior art keywords
steel
ounces
per ton
polytetrafluroethylene
alloy
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Expired - Lifetime
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US124316A
Inventor
Wilbur T Bolkcom
William E Knapp
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American Metallurgical Products Co
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American Metallurgical Products Co
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Priority to US124316A priority Critical patent/US3158913A/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/076—Use of slags or fluxes as treating agents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • a stainless steel of the austenitic type having a nominal analysis as follows:
  • the practice of our invention consists in adding about one to two ounces per ton of polytetrafiuroethylene in each of two spaced additions in the ladle followed by another addition of about two to six ounces per ton in the mold during or immediately following teeming.
  • the polytetrafluroethylene may be added by the method and apparatus described in our application, Serial No. 104,197, filed'May 5, 1961 now Patent 3,079,250, issued February 26, 1963.
  • the method of eliminating cold checking and improving hot workability in alloy steels comprising the steps of adding about two ounces to four ounces of polytetrafiuroethylene per ton of steel to the alloy steel to be treated in the ladle, adding to the same steel about two to six ounces of polytetrafluroethylene per ton of steel in the mold, solidifying the molten mass and working the steel.
  • the method of eliminating cold checking and improving hot workability in alloy steels comprising the steps of adding about one ounce to two ounces of polytetrafluroethylene per ton of steel in each of two spaced addi tions to the alloy steel to be treated in the ladle, adding to the same steel about two to six ounces of polytetrafluroethylene per ton of steel during teeming in the mold, solidifying the molten mass and working the steel.
  • the method of eliminating cold checking and improving hot workability in alloy steels comprising the steps of adding about two ounces of polytetrafluroethylene per ton of steel in each of two spaced additions to the alloy steel to be treated in the ladle, adding to the same steel about four ounces of polytetrafluroethylene per ton of steel during teeming in the mold, solidifying the molten mass and working the steel.
  • the method of eliminating cold checking and improving hot workability in austenitic stainless steels comprising the steps of adding about two ounces to four ounces of polytetrafiuroethylene per tone of steel to the alloy steel to be treated in the ladle, adding to the same steel about two to six ounces of polytetrafluroethylene per ton of steel in the mold, solidifying the molten mass and working the steel.
  • the method of eliminating cold checking and improving hot workability in austenitic stainless steel comprising the steps of adding about one ounce to two ounces of polytetrafluroethylene per ton of steel in each of two spaced additions to the alloy steel to be treated in the ladle, adding to the same steel about two to six ounces of polytetrafiuroethylene per ton of steel during teeming in the mold, solidifying the molten mass and working the steel.
  • MICHAEL V. BRINDISI Primary Examiner.

Description

United States Patent 0 This invention relates to methods of treating steel and particularly to a method of treating steel to prevent cold checks, (edge cracking) and improve hot workability in high alloy steels.
One of the problems in the rolling and working of relatively high alloy steels such as the stainless steels is that of cold checking. For example, austenitic stainless steels are frequently cold checked particularly during the rolling of the last quarter or more of a coil due to cooling of the steel below the most plastic temperature. This defect of cold checking is quite serious and often results in the discarding of a substantial portion of a coil, particularly at the end of a coil.
We have discovered that if a small amount of a fluorine containing organic compound, for example, polytetrafluroethylene, is added to the molten steel prior to solidification, cold checking will be eliminated and the hot workability of the steel will be materially improved. Similar results may be attained with other high alloy steels where the problem of hot workability and cold checking are of significance.
The practice of our invention may perhaps best be understood by reference to the following examples.
A stainless steel of the austenitic type having a nominal analysis as follows:
was cast and rolled into strip in the usual fashion. The last quarter of the coil in a 48 wide strip cold checked as much as 2in each side. An ingot from the same heat to which 2 ounces per ton of polytetrafluroethylene was added, in each of two successive additions in the ladle, followed by four ounces of polytetrafluroethylene per ton during teeming in the mold was rolled in precisely the same manner and no cold checking whatever was experienced. This shows definitely that hot workability was improved.
Similar results have been attained with stainless steels of other high alloy compositions as well as with tool steel compositions and other highly alloyed steels.
X-ray studies were made, both before and after working, of high alloy'steels from the same heat as the example, one ingot treated with polytetrafiuroethylene as described in the above example and the other untreated. These X-ray micrographs show that the steels which have been treated according to the invention will be healed of voids and rifts by working, whereas the untreated steel will continue to have these defective areas will materially improve hot workability in alloy steels.
Preferably the practice of our invention consists in adding about one to two ounces per ton of polytetrafiuroethylene in each of two spaced additions in the ladle followed by another addition of about two to six ounces per ton in the mold during or immediately following teeming.
The polytetrafluroethylene may be added by the method and apparatus described in our application, Serial No. 104,197, filed'May 5, 1961 now Patent 3,079,250, issued February 26, 1963.
While we have disclosed certain preferred practices of our invention it will be understood that the invention may be otherwise embodied and practiced within the scope of the following claims.
We claim:
1. The method of eliminating cold checking and improving hot workability in alloy steels comprising the steps of adding about two ounces to four ounces of polytetrafiuroethylene per ton of steel to the alloy steel to be treated in the ladle, adding to the same steel about two to six ounces of polytetrafluroethylene per ton of steel in the mold, solidifying the molten mass and working the steel.
2. The method of eliminating cold checking and improving hot workability in alloy steels comprising the steps of adding about one ounce to two ounces of polytetrafluroethylene per ton of steel in each of two spaced addi tions to the alloy steel to be treated in the ladle, adding to the same steel about two to six ounces of polytetrafluroethylene per ton of steel during teeming in the mold, solidifying the molten mass and working the steel.
3. The method of eliminating cold checking and improving hot workability in alloy steels comprising the steps of adding about two ounces of polytetrafluroethylene per ton of steel in each of two spaced additions to the alloy steel to be treated in the ladle, adding to the same steel about four ounces of polytetrafluroethylene per ton of steel during teeming in the mold, solidifying the molten mass and working the steel.
4. The method of eliminating cold checking and improving hot workability in austenitic stainless steels comprising the steps of adding about two ounces to four ounces of polytetrafiuroethylene per tone of steel to the alloy steel to be treated in the ladle, adding to the same steel about two to six ounces of polytetrafluroethylene per ton of steel in the mold, solidifying the molten mass and working the steel.
5. The method of eliminating cold checking and improving hot workability in austenitic stainless steel comprising the steps of adding about one ounce to two ounces of polytetrafluroethylene per ton of steel in each of two spaced additions to the alloy steel to be treated in the ladle, adding to the same steel about two to six ounces of polytetrafiuroethylene per ton of steel during teeming in the mold, solidifying the molten mass and working the steel.
4/56 Canada. 10/58 Great Britain.
MICHAEL V. BRINDISI, Primary Examiner. MARCUS U. LYONS, RAY K. 'WINDHAM, Examiners.

Claims (1)

1. THE METHOD OF ELIMINATING COLD CHECKING AND IMPROVING HOT WORKABILITY IN ALLOY STEELS COMPRISING THE STEPS OF ADDING ABOUT TWO OUNCES TO FOUR OUNCES OF POLYTETRAFLUROETHYLENE PER TON OF STEEL TO THE ALLOY STEEL TO BE TREATED IN THE LADLE, ADDING TO THE SAME STEEL ABOUT TWO TO SIX OUNCES OF POLYTETRAFLUROETHYLENE PER TON OF STEEL IN THE MOLD, SOLIDFYING THE MOLTEN MASS AND WORKING THE STEEL.
US124316A 1961-07-17 1961-07-17 Method of treating steel Expired - Lifetime US3158913A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3321006A (en) * 1963-11-13 1967-05-23 American Metallurg Products Co Methods of treating metal
US3376914A (en) * 1963-11-04 1968-04-09 Foseco Int Production of metal ingots, slabs and billets
US3582838A (en) * 1966-09-27 1971-06-01 Zenith Radio Corp Surface wave devices
US3768999A (en) * 1968-10-23 1973-10-30 Nippon Kokan Kk Coated wire feeding technique for making addition of components to molten metals
US3791438A (en) * 1971-03-27 1974-02-12 Honda Motor Co Ltd Process for manufacturing a wear-resistant cast metal product
US3876421A (en) * 1972-11-09 1975-04-08 Nippon Steel Corp Process for desulfurization of molten pig iron
US3964144A (en) * 1973-10-16 1976-06-22 Georg Fischer Aktiengesellschaft Cast one-piece annular rim member for a vehicle wheel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510155A (en) * 1945-07-11 1950-06-06 Armco Steel Corp Process for treatment of molten stainless steel
CA523458A (en) * 1956-04-03 J. Webbere Fred Casting readily oxidizable alloys
GB803493A (en) * 1956-05-23 1958-10-29 Foundry Services Ltd Improvements in or relating to the degassing of metals and alloys
US3078531A (en) * 1960-10-05 1963-02-26 American Metallurg Products Co Additives for molten metals

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA523458A (en) * 1956-04-03 J. Webbere Fred Casting readily oxidizable alloys
US2510155A (en) * 1945-07-11 1950-06-06 Armco Steel Corp Process for treatment of molten stainless steel
GB803493A (en) * 1956-05-23 1958-10-29 Foundry Services Ltd Improvements in or relating to the degassing of metals and alloys
US3078531A (en) * 1960-10-05 1963-02-26 American Metallurg Products Co Additives for molten metals

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3376914A (en) * 1963-11-04 1968-04-09 Foseco Int Production of metal ingots, slabs and billets
US3321006A (en) * 1963-11-13 1967-05-23 American Metallurg Products Co Methods of treating metal
US3582838A (en) * 1966-09-27 1971-06-01 Zenith Radio Corp Surface wave devices
US3768999A (en) * 1968-10-23 1973-10-30 Nippon Kokan Kk Coated wire feeding technique for making addition of components to molten metals
US4010028A (en) * 1968-10-23 1977-03-01 Uniroyal Inc. Bonded calcium carbide article and method for making the same
US3791438A (en) * 1971-03-27 1974-02-12 Honda Motor Co Ltd Process for manufacturing a wear-resistant cast metal product
US3876421A (en) * 1972-11-09 1975-04-08 Nippon Steel Corp Process for desulfurization of molten pig iron
US3964144A (en) * 1973-10-16 1976-06-22 Georg Fischer Aktiengesellschaft Cast one-piece annular rim member for a vehicle wheel

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