GB702837A - Improvements in or relating to the annealing of stainless steel - Google Patents

Improvements in or relating to the annealing of stainless steel

Info

Publication number
GB702837A
GB702837A GB2601250A GB2601250A GB702837A GB 702837 A GB702837 A GB 702837A GB 2601250 A GB2601250 A GB 2601250A GB 2601250 A GB2601250 A GB 2601250A GB 702837 A GB702837 A GB 702837A
Authority
GB
United Kingdom
Prior art keywords
annealing
stainless steel
relating
nitrogen
atmosphere
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
GB2601250A
Inventor
Charles D Branson
Ralph A Smith
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.)
Robertshaw Controls Co
Original Assignee
Robertshaw Fulton Controls Co
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 Robertshaw Fulton Controls Co filed Critical Robertshaw Fulton Controls Co
Priority to GB2601250A priority Critical patent/GB702837A/en
Publication of GB702837A publication Critical patent/GB702837A/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 Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

In a process for annealing stabilised stainless steel, i.e stainless steel containing columbium or titanium to prevent migration of carbon to the grain boundaries, an oxidising agent is added to the nitrogen-containing atmosphere in the annealing furnace. The nitrogen-containing atmosphere may be cracked ammonia and the oxidising agent air or water. Part of the cracked ammonia may be bubbled through water to produce an atmosphere having a dew-point between -55 DEG F. and +10 DEG F. for annealing temperatures between 1750 and 2050 DEG F. It is stated that steels given this treatment do not show weld decay after heating to 1200 DEG F.
GB2601250A 1950-10-25 1950-10-25 Improvements in or relating to the annealing of stainless steel Expired GB702837A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2601250A GB702837A (en) 1950-10-25 1950-10-25 Improvements in or relating to the annealing of stainless steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2601250A GB702837A (en) 1950-10-25 1950-10-25 Improvements in or relating to the annealing of stainless steel

Publications (1)

Publication Number Publication Date
GB702837A true GB702837A (en) 1954-01-27

Family

ID=10236960

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2601250A Expired GB702837A (en) 1950-10-25 1950-10-25 Improvements in or relating to the annealing of stainless steel

Country Status (1)

Country Link
GB (1) GB702837A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0046567A2 (en) * 1980-08-22 1982-03-03 Air Products And Chemicals, Inc. Inhibited annealing of ferrous metals containing chromium
CN114250355A (en) * 2021-12-23 2022-03-29 中冶南方（武汉）热工有限公司 Hot-rolled titanium strip continuous annealing furnace compatible with hot-rolled stainless steel annealing and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0046567A2 (en) * 1980-08-22 1982-03-03 Air Products And Chemicals, Inc. Inhibited annealing of ferrous metals containing chromium
EP0046567A3 (en) * 1980-08-22 1982-03-17 Air Products And Chemicals, Inc. Inhibited annealing of ferrous metals containing chromium
CN114250355A (en) * 2021-12-23 2022-03-29 中冶南方（武汉）热工有限公司 Hot-rolled titanium strip continuous annealing furnace compatible with hot-rolled stainless steel annealing and method

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