GB1353753A - Metal hardening process - Google Patents

Metal hardening process

Info

Publication number
GB1353753A
GB1353753A GB235272A GB1073471A GB1353753A GB 1353753 A GB1353753 A GB 1353753A GB 235272 A GB235272 A GB 235272A GB 1073471 A GB1073471 A GB 1073471A GB 1353753 A GB1353753 A GB 1353753A
Authority
GB
United Kingdom
Prior art keywords
temperature
metal
ambient
range
gas
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
GB235272A
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.)
BOC Group Ltd
Original Assignee
British Oxigen 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9973311&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=GB1353753(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by British Oxigen Ltd filed Critical British Oxigen Ltd
Priority to GB235272A priority Critical patent/GB1353753A/en
Priority to ZA722661A priority patent/ZA722661B/en
Priority to DE19722219406 priority patent/DE2219406A1/en
Priority to CH596872A priority patent/CH584758A5/xx
Priority to US00246189A priority patent/US3819428A/en
Priority to FR7214322A priority patent/FR2136621A5/fr
Publication of GB1353753A publication Critical patent/GB1353753A/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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/04—Hardening by cooling below 0 degrees Celsius

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

1353753 Metal heat treatment process BRITISH OXYGEN CO Ltd 17 April 1972 [22 April 1971 18 Jan 1972] 10734/71 and 2352/72 Heading C7N In a metal hardening process the metal is, in sequence, heated to an elevated temperature, quenched to a temperature not less than ambient, cooled slowly to within the range -80 to -120‹C in a single cooling region, which is initially at or near ambient temperature, by indirect heat exchange with cold or liquefied gas or by direct contact with cold gas, allowed to return to ambient temperature, then tempered at elevated temperature and finally cooled to ambient temperature. In the treatment of a tool steel such as one containing 18%W, 4%Cr and 1%V the initial heating may be a preheating to 650-900‹C followed by a short heating to 750-1325‹C e.g. for 1 to 5 minutes and the quenching to a temperature in the range ambient to 500‹C, e.g. in a gas such as air or nitrogen or oil or molten salt. Sub-zero cooling may take place in a bath of acetone through which liquid nitrogen is slowly passed to cool the acetone e.g. to -100‹C in 10 minutes. In a further method of cooling the metal being treated is placed in a box 2 having front and rear sections 4 and 6. Cold gas is circulated from inlet 10 to outlet 12 and insulated duct 14 circulation being by blower 16. Liquefied gas is introduced into duct 14 by sprayer 20 the liquefied gas supply being controlled by thermostat. Subsequent tempering may be effected in the range 150-600‹C for ¢ to 2 hours.
GB235272A 1971-04-22 1971-04-22 Metal hardening process Expired GB1353753A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GB235272A GB1353753A (en) 1971-04-22 1971-04-22 Metal hardening process
ZA722661A ZA722661B (en) 1971-04-22 1972-04-19 Metal treatment
DE19722219406 DE2219406A1 (en) 1971-04-22 1972-04-20 Metal hardening process and hard metal produced according to this process
CH596872A CH584758A5 (en) 1971-04-22 1972-04-21
US00246189A US3819428A (en) 1971-04-22 1972-04-21 Metal treatment
FR7214322A FR2136621A5 (en) 1971-04-22 1972-04-21

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB235272A GB1353753A (en) 1971-04-22 1971-04-22 Metal hardening process

Publications (1)

Publication Number Publication Date
GB1353753A true GB1353753A (en) 1974-05-22

Family

ID=9973311

Family Applications (1)

Application Number Title Priority Date Filing Date
GB235272A Expired GB1353753A (en) 1971-04-22 1971-04-22 Metal hardening process

Country Status (2)

Country Link
GB (1) GB1353753A (en)
ZA (1) ZA722661B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5259200A (en) * 1991-08-30 1993-11-09 Nu-Bit, Inc. Process for the cryogenic treatment of metal containing materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5259200A (en) * 1991-08-30 1993-11-09 Nu-Bit, Inc. Process for the cryogenic treatment of metal containing materials

Also Published As

Publication number Publication date
ZA722661B (en) 1973-03-28

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Legal Events

Date Code Title Description
414F Notice of opposition given (sect. 14/1949)
414A Case decided by the comptroller ** specification amended (sect. 14/1949)
PS Patent sealed
SP Amendment (slips) printed
PCNP Patent ceased through non-payment of renewal fee