JPS5741354A - Superhigh strength steel - Google Patents

Superhigh strength steel

Info

Publication number
JPS5741354A
JPS5741354A JP11698380A JP11698380A JPS5741354A JP S5741354 A JPS5741354 A JP S5741354A JP 11698380 A JP11698380 A JP 11698380A JP 11698380 A JP11698380 A JP 11698380A JP S5741354 A JPS5741354 A JP S5741354A
Authority
JP
Japan
Prior art keywords
ductility
toughness
amount
remelting
inclusions
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
JP11698380A
Other languages
Japanese (ja)
Inventor
Shoichi Fukui
Koji Yoshida
Koichiro Tada
Kenichi Watanabe
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.)
Daido Steel Co Ltd
Original Assignee
Daido Steel Co 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 Daido Steel Co Ltd filed Critical Daido Steel Co Ltd
Priority to JP11698380A priority Critical patent/JPS5741354A/en
Publication of JPS5741354A publication Critical patent/JPS5741354A/en
Pending legal-status Critical Current

Links

Landscapes

  • Treatment Of Steel In Its Molten State (AREA)

Abstract

PURPOSE: To provide sufficient toughness and ductility as well as high strength to a steel by adjusting the S content to a very small amount to reduce the amount of unfavorable inclusions and by adding Ca to form a spheroidal composite inclusion of oxide and sulfide.
CONSTITUTION: This superhigh strength steel consists of, by wt., 0.25W0.55% C, 0.15W3.00% Si, 0.35W1.00% Mn, ≤0.005% S, 0.60W1.20% Cr, 0.15W1.20% Mo, 0.001W0.01% Ca and the balance Fe with inevitable impurities. When the S content exceeds the upper limit, no sufficient effect is produced by Ca for improving the toughness and ductility. Ca forms oxysulfide, the oxysulfide floats and separates during casting and remelting preferably in a vacuum, and the residual inclusion is spheroidized after the remelting. Below the lower limit of Ca produces no effect, and above the upper limit of Ca increases the amount of inclusions and deteriorates the toughness and ductility. To said basic components may be suitably added one or more among Ni, B, Ti, Nb and V.
COPYRIGHT: (C)1982,JPO&Japio
JP11698380A 1980-08-27 1980-08-27 Superhigh strength steel Pending JPS5741354A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11698380A JPS5741354A (en) 1980-08-27 1980-08-27 Superhigh strength steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11698380A JPS5741354A (en) 1980-08-27 1980-08-27 Superhigh strength steel

Publications (1)

Publication Number Publication Date
JPS5741354A true JPS5741354A (en) 1982-03-08

Family

ID=14700579

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11698380A Pending JPS5741354A (en) 1980-08-27 1980-08-27 Superhigh strength steel

Country Status (1)

Country Link
JP (1) JPS5741354A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59177317A (en) * 1983-03-29 1984-10-08 Daido Steel Co Ltd Manufacture of supertough steel
US7074283B2 (en) * 2002-03-29 2006-07-11 Sumitomo Metal Industries, Ltd. Low alloy steel

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52101624A (en) * 1976-02-23 1977-08-25 Nippon Steel Corp Rail whose tumbling fatigue life is prolonged
JPS52127426A (en) * 1976-04-19 1977-10-26 Daido Steel Co Ltd Precipitation haredning hot working tool steel
JPS52135819A (en) * 1976-05-10 1977-11-14 Daido Steel Co Ltd Gear
JPS5354118A (en) * 1976-10-28 1978-05-17 Nippon Steel Corp Production of high tensile steel sheet with excellent brittleness crackpropagation stopping properties
JPS5375114A (en) * 1976-12-17 1978-07-04 Nippon Steel Corp Manufacture of structural steel
JPS5389815A (en) * 1977-01-17 1978-08-08 Sumitomo Metal Ind Ltd Steel bar for low temperature
JPS55107727A (en) * 1979-02-15 1980-08-19 Nippon Steel Corp Production of tough bar steel material of less anisotropy
JPS5658952A (en) * 1979-10-17 1981-05-22 Nippon Steel Corp Low alloy steel with superior temper brittleness resistance

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52101624A (en) * 1976-02-23 1977-08-25 Nippon Steel Corp Rail whose tumbling fatigue life is prolonged
JPS52127426A (en) * 1976-04-19 1977-10-26 Daido Steel Co Ltd Precipitation haredning hot working tool steel
JPS52135819A (en) * 1976-05-10 1977-11-14 Daido Steel Co Ltd Gear
JPS5354118A (en) * 1976-10-28 1978-05-17 Nippon Steel Corp Production of high tensile steel sheet with excellent brittleness crackpropagation stopping properties
JPS5375114A (en) * 1976-12-17 1978-07-04 Nippon Steel Corp Manufacture of structural steel
JPS5389815A (en) * 1977-01-17 1978-08-08 Sumitomo Metal Ind Ltd Steel bar for low temperature
JPS55107727A (en) * 1979-02-15 1980-08-19 Nippon Steel Corp Production of tough bar steel material of less anisotropy
JPS5658952A (en) * 1979-10-17 1981-05-22 Nippon Steel Corp Low alloy steel with superior temper brittleness resistance

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59177317A (en) * 1983-03-29 1984-10-08 Daido Steel Co Ltd Manufacture of supertough steel
JPH0454724B2 (en) * 1983-03-29 1992-09-01 Daido Steel Co Ltd
US7074283B2 (en) * 2002-03-29 2006-07-11 Sumitomo Metal Industries, Ltd. Low alloy steel

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