JPS5687650A - Manufacture of ultralow si free-cutting steel - Google Patents

Manufacture of ultralow si free-cutting steel

Info

Publication number
JPS5687650A
JPS5687650A JP16641079A JP16641079A JPS5687650A JP S5687650 A JPS5687650 A JP S5687650A JP 16641079 A JP16641079 A JP 16641079A JP 16641079 A JP16641079 A JP 16641079A JP S5687650 A JPS5687650 A JP S5687650A
Authority
JP
Japan
Prior art keywords
sio
free
cutting steel
refractory
cao
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
JP16641079A
Other languages
Japanese (ja)
Other versions
JPS5940202B2 (en
Inventor
Takamiki Hata
Hiroyuki Matsuyama
Koichi Ebato
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel 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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP54166410A priority Critical patent/JPS5940202B2/en
Publication of JPS5687650A publication Critical patent/JPS5687650A/en
Publication of JPS5940202B2 publication Critical patent/JPS5940202B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Compositions Of Oxide Ceramics (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

PURPOSE: To manufacture an ultralow Si free-cutting steel with superior machinability and cold workability by adjusting the lining refractory of a molten steel vessel used in a low Si free-cutting steel refining process to a composition free from SiO2 simple crystals.
CONSTITUTION: When molten steel is discharged into a vessel such as a ladle or a tundish in the refining of a low Si free-cutting steel contg. <0.005% Si, SiO2 in the lining refractory of the vessel is reduced to Si to often increase the Si content of the molten steel. In order to prevent the reduction, SiO2 in the refractory is allowed to exist in the form of an eutectic compound of SiO2 and other basic or neutral oxide in place of SiO2 simple crystals. Accordingly, the SiO2 content of the refractory is adjusted to ≤30%, ≤50%, ≤60%, ≤30% ≤50% and ≤30% in case of Al2O3-SiO2, CaO-SiO2, MgO-SiO2 CaO-Al2O3-SiO2, CaO-MgO-SiO2, and MgO- -Al2O3-SiO2 respectively. Thus, an increase of Si from the lining refractory by reduction is prevented, and a free-cutting steel contg. ≤0.005% Si can be manufactured.
COPYRIGHT: (C)1981,JPO&Japio
JP54166410A 1979-12-20 1979-12-20 Manufacturing method of ultra-low S1 free-cutting steel Expired JPS5940202B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54166410A JPS5940202B2 (en) 1979-12-20 1979-12-20 Manufacturing method of ultra-low S1 free-cutting steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54166410A JPS5940202B2 (en) 1979-12-20 1979-12-20 Manufacturing method of ultra-low S1 free-cutting steel

Publications (2)

Publication Number Publication Date
JPS5687650A true JPS5687650A (en) 1981-07-16
JPS5940202B2 JPS5940202B2 (en) 1984-09-28

Family

ID=15830896

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54166410A Expired JPS5940202B2 (en) 1979-12-20 1979-12-20 Manufacturing method of ultra-low S1 free-cutting steel

Country Status (1)

Country Link
JP (1) JPS5940202B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59177347A (en) * 1983-03-15 1984-10-08 バルルツク Manufacture of high cuttability steel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0648502A (en) * 1992-07-24 1994-02-22 Nippon Heater Kiki Kk Automatic classification and storage machine for empty can

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JOURNAL OF METALS-29,30=1967 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59177347A (en) * 1983-03-15 1984-10-08 バルルツク Manufacture of high cuttability steel
JPH0368099B2 (en) * 1983-03-15 1991-10-25 Vallourec

Also Published As

Publication number Publication date
JPS5940202B2 (en) 1984-09-28

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