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GB1233847A - - Google Patents

Info

Publication number
GB1233847A
GB1233847A GB1233847DA GB1233847A GB 1233847 A GB1233847 A GB 1233847A GB 1233847D A GB1233847D A GB 1233847DA GB 1233847 A GB1233847 A GB 1233847A
Authority
GB
United Kingdom
Prior art keywords
steels
atmosphere
heat
hydrogen
martensitic
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
Application number
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 filed Critical
Publication of GB1233847A publication Critical patent/GB1233847A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

1,233,847. Heat-treating stainless steels. ALLEGHENY LUDLUM STEEL CORP. May 12, 1969 [June 28, 1968], No.24169/69. Headings C7A and C7N. Martensitic and metastable austenitic steels in sheet and strip form are heat-treated, including cooling, in an atmosphere of hydrogen with one or more of argon, helium or nitrogen, the hydrogen forming not more than 50% of the mixture. Preferably the dew-point of the atmosphere is not above -20‹ F. As exemplified the following steels were annealed at 2025‹ F. for 70 seconds.
GB1233847D 1968-06-28 1969-05-12 Expired GB1233847A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US74085068A 1968-06-28 1968-06-28

Publications (1)

Publication Number Publication Date
GB1233847A true GB1233847A (en) 1971-06-03

Family

ID=24978340

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1233847D Expired GB1233847A (en) 1968-06-28 1969-05-12

Country Status (4)

Country Link
BE (1) BE735024A (en)
DE (1) DE1932382A1 (en)
FR (1) FR2011766A1 (en)
GB (1) GB1233847A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009149903A1 (en) * 2008-06-13 2009-12-17 Loi Thermoprocess Gmbh Process for the high-temperature annealing of grain-oriented magnetic steel strip in an inert gas atmosphere in a heat treatment furnace
US7867344B2 (en) 2004-07-15 2011-01-11 Nippon Steel Corporation Hot pressing method for high strength member using steel sheet and hot pressed parts

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4334938A (en) * 1980-08-22 1982-06-15 Air Products And Chemicals, Inc. Inhibited annealing of ferrous metals containing chromium
DE3826729A1 (en) * 1988-08-05 1990-02-15 Krauss Maffei Ag METHOD FOR THE HEAT TREATMENT OF A HIGH-ALLOYED CHROMA STEEL
FR2660744B1 (en) * 1990-04-04 1994-03-11 Air Liquide BELL OVEN.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7867344B2 (en) 2004-07-15 2011-01-11 Nippon Steel Corporation Hot pressing method for high strength member using steel sheet and hot pressed parts
WO2009149903A1 (en) * 2008-06-13 2009-12-17 Loi Thermoprocess Gmbh Process for the high-temperature annealing of grain-oriented magnetic steel strip in an inert gas atmosphere in a heat treatment furnace

Also Published As

Publication number Publication date
BE735024A (en) 1969-12-23
FR2011766A1 (en) 1970-03-06
DE1932382A1 (en) 1970-02-05

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees