GB628707A - Improvements in or relating to the tempering and cleaning of ferrous metals - Google Patents

Improvements in or relating to the tempering and cleaning of ferrous metals

Info

Publication number
GB628707A
GB628707A GB2665747A GB2665747A GB628707A GB 628707 A GB628707 A GB 628707A GB 2665747 A GB2665747 A GB 2665747A GB 2665747 A GB2665747 A GB 2665747A GB 628707 A GB628707 A GB 628707A
Authority
GB
United Kingdom
Prior art keywords
cleaning
tempering
per cent
bath
relating
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
GB2665747A
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.)
JAMES BARRY DELANY
Imperial Chemical Industries Ltd
Original Assignee
JAMES BARRY DELANY
Imperial Chemical Industries Ltd
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 JAMES BARRY DELANY, Imperial Chemical Industries Ltd filed Critical JAMES BARRY DELANY
Priority to GB2665747A priority Critical patent/GB628707A/en
Publication of GB628707A publication Critical patent/GB628707A/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
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/607—Molten salts

Abstract

Ferrous metal articles are tempered in a bath of fused caustic soda above 400 DEG C., preferably 630-700 DEG C. and then cleaned in another bath at a temperature below 400 DEG C. consisting of fused caustic soda and up to 20 per cent by weight of one or more of the compounds sodium hydride, sodamide and sodium cyanide. The cleaning bath may contain 1-20 per cent., preferably 2-5 per cent, by weight of sodium hydride and the cleaning operation follows the tempering operation. According to the Provisional Specification the minimum tempering temperature is 500 DEG C. Specifications 159,793, [Class 72], 557,530, 565,567, 575,103, 586,250, [Group XXXVI], and 598,735 are referred to.
GB2665747A 1947-10-03 1947-10-03 Improvements in or relating to the tempering and cleaning of ferrous metals Expired GB628707A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2665747A GB628707A (en) 1947-10-03 1947-10-03 Improvements in or relating to the tempering and cleaning of ferrous metals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2665747A GB628707A (en) 1947-10-03 1947-10-03 Improvements in or relating to the tempering and cleaning of ferrous metals

Publications (1)

Publication Number Publication Date
GB628707A true GB628707A (en) 1949-09-02

Family

ID=10247118

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2665747A Expired GB628707A (en) 1947-10-03 1947-10-03 Improvements in or relating to the tempering and cleaning of ferrous metals

Country Status (1)

Country Link
GB (1) GB628707A (en)

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