EP1054074A3 - A free machining steel bearing bismuth and sulfur with superior high temperature ductility, and manufacturing method therefor - Google Patents

A free machining steel bearing bismuth and sulfur with superior high temperature ductility, and manufacturing method therefor Download PDF

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Publication number
EP1054074A3
EP1054074A3 EP99303965A EP99303965A EP1054074A3 EP 1054074 A3 EP1054074 A3 EP 1054074A3 EP 99303965 A EP99303965 A EP 99303965A EP 99303965 A EP99303965 A EP 99303965A EP 1054074 A3 EP1054074 A3 EP 1054074A3
Authority
EP
European Patent Office
Prior art keywords
high temperature
bismuth
free
manufacturing
superior high
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.)
Withdrawn
Application number
EP99303965A
Other languages
German (de)
French (fr)
Other versions
EP1054074A2 (en
Inventor
Sam Kyo Cho
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.)
Pohang Iron and Steel Co Ltd
Original Assignee
Pohang Iron and 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 Pohang Iron and Steel Co Ltd filed Critical Pohang Iron and Steel Co Ltd
Priority to EP99303965A priority Critical patent/EP1054074A3/en
Publication of EP1054074A2 publication Critical patent/EP1054074A2/en
Publication of EP1054074A3 publication Critical patent/EP1054074A3/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

A bismuth-sulfuric (to be called "Bi-S" below) free-machinable steel showing a superior high temperature ductility, and a manufacturing method therefor, are disclosed, in which surface defects do not occur at a low rolling temperature. The Bi-S free-machinable steel with a superior high temperature ductility includes: in wt%, 0.05-0.15% of C, 0.5-2.0% of Mn, 0.15-0.40% of S, 0.01-0.10% of P, 0.003-0.020% of O, 0.03-0.30% of Bi, 0.01% or less of Si, 0.0009% or less of Al, and a balance of Fe and other unavoidable impurities; an MnS inclusion with MnS and Bi absorbed into it; and a metallic Bi inclusion. In another aspect, the free machinable steel includes 0.02-0.1% of Ti and 0.0030-0.0100% of N in addition to the above elements. In still another aspect, the free machinable steel includes 0.0050-0.0150% of B and 0.0070% or less of N in addition to the above elements.
EP99303965A 1999-05-21 1999-05-21 A free machining steel bearing bismuth and sulfur with superior high temperature ductility, and manufacturing method therefor Withdrawn EP1054074A3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99303965A EP1054074A3 (en) 1999-05-21 1999-05-21 A free machining steel bearing bismuth and sulfur with superior high temperature ductility, and manufacturing method therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99303965A EP1054074A3 (en) 1999-05-21 1999-05-21 A free machining steel bearing bismuth and sulfur with superior high temperature ductility, and manufacturing method therefor

Publications (2)

Publication Number Publication Date
EP1054074A2 EP1054074A2 (en) 2000-11-22
EP1054074A3 true EP1054074A3 (en) 2001-06-27

Family

ID=8241403

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99303965A Withdrawn EP1054074A3 (en) 1999-05-21 1999-05-21 A free machining steel bearing bismuth and sulfur with superior high temperature ductility, and manufacturing method therefor

Country Status (1)

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EP (1) EP1054074A3 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3918787B2 (en) * 2003-08-01 2007-05-23 住友金属工業株式会社 Low carbon free cutting steel
KR101685863B1 (en) * 2013-02-18 2016-12-12 신닛테츠스미킨 카부시키카이샤 Lead-containing free-machining steel
JP5954484B2 (en) * 2013-02-18 2016-07-20 新日鐵住金株式会社 Lead free cutting steel
CN113528889B (en) * 2021-07-15 2022-01-18 安徽工业大学 Bismuth-titanium-manganese-selenium alloy for environment-friendly bismuth-containing free-cutting steel and preparation method thereof
CN113546966B (en) * 2021-08-12 2023-08-01 广东韶钢松山股份有限公司 Method for reducing pits on surface of chalcogenide free-cutting steel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4255188A (en) * 1979-08-29 1981-03-10 Inland Steel Company Free machining steel with bismuth and manganese sulfide
EP0219194A1 (en) * 1985-07-31 1987-04-22 Daido Tokushuko Kabushiki Kaisha Austenitic free cutting stainless steels
JPH05331592A (en) * 1992-06-01 1993-12-14 Kobe Steel Ltd Free cutting steel excellent in machinability and hot workability and its production
JPH06114500A (en) * 1992-10-05 1994-04-26 Nippon Steel Corp Production of low-carbon sulfur free-cutting steel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4255188A (en) * 1979-08-29 1981-03-10 Inland Steel Company Free machining steel with bismuth and manganese sulfide
EP0219194A1 (en) * 1985-07-31 1987-04-22 Daido Tokushuko Kabushiki Kaisha Austenitic free cutting stainless steels
JPH05331592A (en) * 1992-06-01 1993-12-14 Kobe Steel Ltd Free cutting steel excellent in machinability and hot workability and its production
JPH06114500A (en) * 1992-10-05 1994-04-26 Nippon Steel Corp Production of low-carbon sulfur free-cutting steel

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
"Spurenelemente in Stählen", VERLAG STAHLEISEN, DÜSSELDORF, XP002119883 *
CHEMICAL ABSTRACTS, vol. 125, no. 20, 11 November 1996, Columbus, Ohio, US; abstract no. 254479, CHO, SAM-KYU: "Effect of hot rolling and bismuth content on the hot ductility in free machining steel with bismuth and manganese sulfide" XP002119884 *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 170 (C - 1182) 23 March 1994 (1994-03-23) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 396 (M - 1644) 25 July 1994 (1994-07-25) *
TAEHAN KUMSOK HAKHOECHI (1996), 34(7), 823-829 *

Also Published As

Publication number Publication date
EP1054074A2 (en) 2000-11-22

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