FR2358465A1 - Bainitic steel support sections with predetermined strength - esp. for supporting subterranean galleries - Google Patents

Bainitic steel support sections with predetermined strength - esp. for supporting subterranean galleries

Info

Publication number
FR2358465A1
FR2358465A1 FR7621520A FR7621520A FR2358465A1 FR 2358465 A1 FR2358465 A1 FR 2358465A1 FR 7621520 A FR7621520 A FR 7621520A FR 7621520 A FR7621520 A FR 7621520A FR 2358465 A1 FR2358465 A1 FR 2358465A1
Authority
FR
France
Prior art keywords
steel
esp
supporting
sections
steel support
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.)
Granted
Application number
FR7621520A
Other languages
French (fr)
Other versions
FR2358465B1 (en
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.)
Bochumer Eisenhuette Heintzmann GmbH and Co KG
Original Assignee
Bochumer Eisenhuette Heintzmann GmbH and Co KG
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 Bochumer Eisenhuette Heintzmann GmbH and Co KG filed Critical Bochumer Eisenhuette Heintzmann GmbH and Co KG
Priority to FR7621520A priority Critical patent/FR2358465A1/en
Publication of FR2358465A1 publication Critical patent/FR2358465A1/en
Application granted granted Critical
Publication of FR2358465B1 publication Critical patent/FR2358465B1/fr
Granted 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
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching

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)

Abstract

Steel sections with high bend strengths and high resistance to brittle fracture are made of a fine-grained steel contg. 0.28-0.4%C, 0.15-0.45% Si, 0.65-1.0% Mn, =0.3% (Cr + Ni), =0.08% P and =0.05% S. The sections are heated by continuous circulation in a furnace to above the Ac3 temp. They are then passed at a constant rate in front of cooling nozzles (12-18) situated immediately outside the furnace. The steel sections are cooled to an upper bainite transformation region. They are then cooled by contacting with air until transformation is complete. After which cooling by spraying with water or by immersion is carried out. The properties of the steel are maintained within narrow limits. Tensile strengths, yield, stress and elongation are constant and the notch strength is 15-20 kg m/cm2.
FR7621520A 1976-07-13 1976-07-13 Bainitic steel support sections with predetermined strength - esp. for supporting subterranean galleries Granted FR2358465A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7621520A FR2358465A1 (en) 1976-07-13 1976-07-13 Bainitic steel support sections with predetermined strength - esp. for supporting subterranean galleries

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7621520A FR2358465A1 (en) 1976-07-13 1976-07-13 Bainitic steel support sections with predetermined strength - esp. for supporting subterranean galleries

Publications (2)

Publication Number Publication Date
FR2358465A1 true FR2358465A1 (en) 1978-02-10
FR2358465B1 FR2358465B1 (en) 1981-01-23

Family

ID=9175702

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7621520A Granted FR2358465A1 (en) 1976-07-13 1976-07-13 Bainitic steel support sections with predetermined strength - esp. for supporting subterranean galleries

Country Status (1)

Country Link
FR (1) FR2358465A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983001959A1 (en) * 1981-12-03 1983-06-09 Hauke, Wilhelm Process for the bainitic hardening at least partially isothermally of a cast iron part

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1433715A1 (en) * 1964-01-17 1968-12-12 Breitenbach Gmbh Ed Process for the heat treatment of heavy workpieces made of forged or cast steel
FR2049610A5 (en) * 1969-06-13 1971-03-26 Mitsubishi Heavy Ind Ltd Annealing of high tension welding steel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1433715A1 (en) * 1964-01-17 1968-12-12 Breitenbach Gmbh Ed Process for the heat treatment of heavy workpieces made of forged or cast steel
FR2049610A5 (en) * 1969-06-13 1971-03-26 Mitsubishi Heavy Ind Ltd Annealing of high tension welding steel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983001959A1 (en) * 1981-12-03 1983-06-09 Hauke, Wilhelm Process for the bainitic hardening at least partially isothermally of a cast iron part

Also Published As

Publication number Publication date
FR2358465B1 (en) 1981-01-23

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