JPS57171613A - Controlling method for refining of high chromium steel - Google Patents

Controlling method for refining of high chromium steel

Info

Publication number
JPS57171613A
JPS57171613A JP5775981A JP5775981A JPS57171613A JP S57171613 A JPS57171613 A JP S57171613A JP 5775981 A JP5775981 A JP 5775981A JP 5775981 A JP5775981 A JP 5775981A JP S57171613 A JPS57171613 A JP S57171613A
Authority
JP
Japan
Prior art keywords
refining
molten steel
steel
time
decarburized
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
JP5775981A
Other languages
Japanese (ja)
Other versions
JPS6156287B2 (en
Inventor
Hajime Nashiwa
Hiroshi Tomono
Takeshi Katogi
Koji Ieda
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
Sumitomo Metal 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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP5775981A priority Critical patent/JPS57171613A/en
Publication of JPS57171613A publication Critical patent/JPS57171613A/en
Publication of JPS6156287B2 publication Critical patent/JPS6156287B2/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
    • C21C5/005—Manufacture of stainless steel

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)

Abstract

PURPOSE:To attain the end point content of C with high accuracy while reducing oxidation losses of Cr in the stage of refining high Cr steel in a top blown converter having bottom tuyeres by controlling refining with the coeffts. of decarbonization rate calculated from the measurements of the concns. of C and Cr and temp. of molten steel in an oxidation period with time. CONSTITUTION:In the stage of refining high Cr steel in an oxygen top blown converter provided with bottom tuyeres for introduction of an inert gas, first molten steel is decarburized and dephosphorized by an ordinary method. Next, molten slag contg. phosphorus is discharged, after which inexpensive high carbon ferrochromium such as charge chromium is added to contain Cr in an intended grade. In order to decarburize the C carried by this charge chromium, the molten steel is decarburized by oxygen blowing, and the Cr2 O3 which is oxidized at this time and is included into the molten steel is reduced to Cr by Fe-Si. In this case, the concns. of C and Cr and the temp. of the molten steel during oxidation refining are measured at every constant time, and the rates of decarbonization are calculated. In accordance with this, the oxygen blowing work is controlled, whereby the end point carbon content is controlled to attain the target value with high accuracy.
JP5775981A 1981-04-15 1981-04-15 Controlling method for refining of high chromium steel Granted JPS57171613A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5775981A JPS57171613A (en) 1981-04-15 1981-04-15 Controlling method for refining of high chromium steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5775981A JPS57171613A (en) 1981-04-15 1981-04-15 Controlling method for refining of high chromium steel

Publications (2)

Publication Number Publication Date
JPS57171613A true JPS57171613A (en) 1982-10-22
JPS6156287B2 JPS6156287B2 (en) 1986-12-02

Family

ID=13064800

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5775981A Granted JPS57171613A (en) 1981-04-15 1981-04-15 Controlling method for refining of high chromium steel

Country Status (1)

Country Link
JP (1) JPS57171613A (en)

Also Published As

Publication number Publication date
JPS6156287B2 (en) 1986-12-02

Similar Documents

Publication Publication Date Title
JPS54158320A (en) Refining method for high chromium steel
ES8302787A1 (en) Process for refining high-chromium steels
JPS55128521A (en) Converter operating method
DE3567031D1 (en) Process for refining pig iron
JPS57171613A (en) Controlling method for refining of high chromium steel
Patil et al. Refining of stainless steels
ES8402355A1 (en) Process for producing steel in a converter from pig iron and ferrous scrap.
CA1205290A (en) Method of increasing the cold material charging capacity in the top-blowing production of steel
JPS572813A (en) Production of decarbonized and melted stainless steel
CA1336745C (en) Method for producing chromium containing molten iron with low sulphur concentration
KR100325265B1 (en) A method for manufacturing a high carbon fluid metal in a convertor
JPS5623214A (en) Dephosphorization accelerating method in oxygen top blowing steel making method
US4334922A (en) Process for metal-bath refining
JPS56130416A (en) Steel making method
US4066442A (en) Method of making chrome steel in an electric arc furnace
Trenkler New developments in LD steelmaking
RU1792980C (en) Method of deoxidizing low-carbon steel
SU988879A1 (en) Method for oxygen blasting of metal
JPS5763614A (en) Refining method in top and bottom blowing converter
KR20040048269A (en) A Method of Decreasing Oxygen Dencity in Converter
JPS5594425A (en) Converter steel making method which reduces phosphorus content
Nakanishi Recent Progress of OBM/Q-BOP Steelmaking at Kawasaki Steel Corporation
JPS55107718A (en) Production of molten steel
Brotzmann Progress in Increased Scrap Rates in Converter Steelmaking
Masuda et al. Process for Refining High-Chromium Steels by Oxygen-Blowing