JPS57203713A - Method of decarburization refining in reaction vessel with small free board - Google Patents

Method of decarburization refining in reaction vessel with small free board

Info

Publication number
JPS57203713A
JPS57203713A JP8933381A JP8933381A JPS57203713A JP S57203713 A JPS57203713 A JP S57203713A JP 8933381 A JP8933381 A JP 8933381A JP 8933381 A JP8933381 A JP 8933381A JP S57203713 A JPS57203713 A JP S57203713A
Authority
JP
Japan
Prior art keywords
lance
blowing
theta
molten iron
reaction vessel
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
JP8933381A
Other languages
Japanese (ja)
Other versions
JPS6152212B2 (en
Inventor
Katsuhiko Takeda
Masamichi Kojima
Morikatsu Sakurada
Mitsuhiko Nishimura
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.)
Nippon Steel Corp
Original Assignee
Nippon 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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP8933381A priority Critical patent/JPS57203713A/en
Priority to AU81848/82A priority patent/AU532932B2/en
Priority to DE8282102580T priority patent/DE3269285D1/en
Priority to EP19820102580 priority patent/EP0061749B1/en
Publication of JPS57203713A publication Critical patent/JPS57203713A/en
Publication of JPS6152212B2 publication Critical patent/JPS6152212B2/ja
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/285—Plants therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/04—Removing impurities other than carbon, phosphorus or sulfur

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Botany (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

PURPOSE:To improve a yield of iron and to stably perform decarburization blowing, by top-blowing gaseous oxygen extremely softly and blowing a gas from an immersed lance to a molten iron containing low impurities, in the inside of a reaction vessel with a small board. CONSTITUTION:Molten iron 2 containing previously reduced Si, P and S is charged into a reaction vessel 1 to make its static height L0 with respect to the inner height Lt of the vessel 1 to be L0/Lt>=0.6 and make a free board H small. Next, gaseous oxygen is blown from an oxygen feeding lance 3 to satisfy the relation of L/L0<=0.3 in the intruding depth of oxygen jet into the molten iron. Where, L is expressed by the equationsIand II (L0; above-mentioned mm., L; above-mentioned mm., h; distance between the lance and the surface of molten metal mm., Fo2; flow rate of the gaseous oxygen Nm<3>/Hr, n; number of holes of a lance nozzle, d; dia. of the lance nozzle mm., K; correcting factors depending on an injecting angle theta of the nozzle, where in the case of n=1, K=1; and where in the case of n>=2, K=1.7 when theta=0; K=1.4 when theta=6 deg., and K=1 when theta=10 deg.). At the same time, the molten iron is agitated by blowing a gas from the lance and an air-permeable refractory 4, etc.
JP8933381A 1981-03-30 1981-06-10 Method of decarburization refining in reaction vessel with small free board Granted JPS57203713A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP8933381A JPS57203713A (en) 1981-06-10 1981-06-10 Method of decarburization refining in reaction vessel with small free board
AU81848/82A AU532932B2 (en) 1981-03-30 1982-03-24 Post-refining of basic oxygen steel
DE8282102580T DE3269285D1 (en) 1981-03-30 1982-03-26 A multi-step steelmaking refining method
EP19820102580 EP0061749B1 (en) 1981-03-30 1982-03-26 A multi-step steelmaking refining method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8933381A JPS57203713A (en) 1981-06-10 1981-06-10 Method of decarburization refining in reaction vessel with small free board

Publications (2)

Publication Number Publication Date
JPS57203713A true JPS57203713A (en) 1982-12-14
JPS6152212B2 JPS6152212B2 (en) 1986-11-12

Family

ID=13967754

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8933381A Granted JPS57203713A (en) 1981-03-30 1981-06-10 Method of decarburization refining in reaction vessel with small free board

Country Status (1)

Country Link
JP (1) JPS57203713A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5871318A (en) * 1981-10-26 1983-04-28 Nippon Kokan Kk <Nkk> Operating method for converter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102443059B1 (en) 2018-06-28 2022-09-13 후루카와 덴키 고교 가부시키가이샤 Copper alloy plate and copper alloy plate manufacturing method and connector using copper alloy plate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5871318A (en) * 1981-10-26 1983-04-28 Nippon Kokan Kk <Nkk> Operating method for converter

Also Published As

Publication number Publication date
JPS6152212B2 (en) 1986-11-12

Similar Documents

Publication Publication Date Title
KR900013093A (en) Dissolution reduction method of Ni ore
JPS5687617A (en) Steel making method using arc furnace
CA2221808A1 (en) Stable operation of a smelter reactor
ES8101648A1 (en) Converter steelmaking process.
JPS5623215A (en) Converter steel making method
EP0879896A4 (en) Molten steel smelting apparatus for producing ultra-low carbon steel and a smelting method using this apparatus
JPS57203713A (en) Method of decarburization refining in reaction vessel with small free board
GB1522864A (en) Method and apparatus for manufacturing steel from pig iro
JPS56123318A (en) Refining method of metal refining furnace for producing large amount of co for recovering exhaust gas
JPS6456816A (en) Heating method for molten steel in ladle
JPS5757816A (en) Steel making method by composite top and bottom blown converter
KR880014113A (en) Steelmaking Method through Reduction Smelting
JPS5757819A (en) Converter steel making method
JPS5591926A (en) Preparation of extremely low carbon nitrogen stainless steel
JPS57203711A (en) Refining method in steel making
JPS5576013A (en) Al adding method to molten steel
JPS556476A (en) Atmosphere shielding method in ladle refining
JPS6468415A (en) Production of molten stainless steel by smelting reduction
JPS6447833A (en) Production of medium and low carbon ferromanganese
JPS648211A (en) Method for pretreating molten iron
JPS5792115A (en) Dephosphorization method for molten iron
JPS5544569A (en) Choke preventing method of gas blowing nozzle
Gaye et al. Studies on post-combustion in an oxygen converter: mechanisms and operations
JPS6473012A (en) Refining method by using top and bottom blowing refining furnace
JPS552759A (en) Manufacture of ultra-low-carbon stainless steel