GB372316A - Improvements in or relating to the heat treatment of rails such as railway or tramway rails - Google Patents

Improvements in or relating to the heat treatment of rails such as railway or tramway rails

Info

Publication number
GB372316A
GB372316A GB2943/31A GB294331A GB372316A GB 372316 A GB372316 A GB 372316A GB 2943/31 A GB2943/31 A GB 2943/31A GB 294331 A GB294331 A GB 294331A GB 372316 A GB372316 A GB 372316A
Authority
GB
United Kingdom
Prior art keywords
rails
rail
cooled
heat treatment
railway
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
GB2943/31A
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.)
Bethlehem Steel Corp
Original Assignee
Bethlehem 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 Bethlehem Steel Corp filed Critical Bethlehem Steel Corp
Publication of GB372316A publication Critical patent/GB372316A/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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails

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 Articles (AREA)

Abstract

In the heat treatment of rails the rail is allowed to cool gradually after heating until substantially all of the metal of the web and the flanges has cooled to a temperature below the critical range, and then before the metal of the head has cooled to the critical range the entire rail is rapidly cooled by quenching in an aqueous medium. Before the major part of the head of the rail has dropped through the blue-heat zone, i.e. about 300 DEG C., the temperature of the rail is equalized by immersing it in a bath of molten lead for a few minutes. The rail is then transferred to a furnace, maintained at a temperature of about 538 DEG C. for a period up to 3 hours and then withdrawn from the furnace and cooled in air.
GB2943/31A 1930-02-05 1931-01-29 Improvements in or relating to the heat treatment of rails such as railway or tramway rails Expired GB372316A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US372316XA 1930-02-05 1930-02-05

Publications (1)

Publication Number Publication Date
GB372316A true GB372316A (en) 1932-04-29

Family

ID=21893184

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2943/31A Expired GB372316A (en) 1930-02-05 1931-01-29 Improvements in or relating to the heat treatment of rails such as railway or tramway rails

Country Status (1)

Country Link
GB (1) GB372316A (en)

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