JPS5554250A - Production of sound cast iron casting - Google Patents

Production of sound cast iron casting

Info

Publication number
JPS5554250A
JPS5554250A JP12618178A JP12618178A JPS5554250A JP S5554250 A JPS5554250 A JP S5554250A JP 12618178 A JP12618178 A JP 12618178A JP 12618178 A JP12618178 A JP 12618178A JP S5554250 A JPS5554250 A JP S5554250A
Authority
JP
Japan
Prior art keywords
gruel
molten metal
degree
freezing
holding time
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.)
Pending
Application number
JP12618178A
Other languages
Japanese (ja)
Inventor
Hiroo Takahashi
Gunichi Fujii
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 JP12618178A priority Critical patent/JPS5554250A/en
Publication of JPS5554250A publication Critical patent/JPS5554250A/en
Pending legal-status Critical Current

Links

Landscapes

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Abstract

PURPOSE: To perform casting at a required gruel-form freezing degree and enable the cast iron casting of stable quality free from defects to be obtained by adjusting molten metal holding time and carbon equivalent based on the measured value of the gruel-form freezing degrees.
CONSTITUTION: The ratio t2/t1 of the difference t1 in freezing start time between the center and surface of molten metal and the freezing end time t2 of the molten metal center, i.e., gruel-form freezing degree is obtained through thermal analysis of the molten cast iron melted at the maximum heating temperature. Next, the production of any casting defect is investigated from the relations between the gruel- form freezing degree and shrinkage quantity and if any defect is predicted, an adequate molten metal holding time is determined by considering the required molten metal holding time and the compensation of carbon equivalent in association to this in accordance with the relations among carbon equivalent, gruel-form freezing degree and holding time, whereby the gruel-form freezing degree may be lowered down to the degree at which no defect will be produced.
COPYRIGHT: (C)1980,JPO&Japio
JP12618178A 1978-10-16 1978-10-16 Production of sound cast iron casting Pending JPS5554250A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12618178A JPS5554250A (en) 1978-10-16 1978-10-16 Production of sound cast iron casting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12618178A JPS5554250A (en) 1978-10-16 1978-10-16 Production of sound cast iron casting

Publications (1)

Publication Number Publication Date
JPS5554250A true JPS5554250A (en) 1980-04-21

Family

ID=14928683

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12618178A Pending JPS5554250A (en) 1978-10-16 1978-10-16 Production of sound cast iron casting

Country Status (1)

Country Link
JP (1) JPS5554250A (en)

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