US3681057A - Aluminum killed-steel - Google Patents

Aluminum killed-steel Download PDF

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Publication number
US3681057A
US3681057A US45108A US3681057DA US3681057A US 3681057 A US3681057 A US 3681057A US 45108 A US45108 A US 45108A US 3681057D A US3681057D A US 3681057DA US 3681057 A US3681057 A US 3681057A
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US
United States
Prior art keywords
steel
content
ingot
weldability
aluminum killed
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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.)
Expired - Lifetime
Application number
US45108A
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English (en)
Inventor
Kiminari Kawakami
Shizunao Yamagishi
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.)
JFE Engineering Corp
Original Assignee
Nippon Kokan Ltd
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Filing date
Publication date
Application filed by Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
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Publication of US3681057A publication Critical patent/US3681057A/en
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    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium

Definitions

  • the present invention is concerned with an aluminum killed-steel of excellent quality and more particularly to Al-killed steel of an improved composition.
  • This invention has mechanical properties as specified is said API Standards.
  • the features lie in the addition of low silicon, Sol. A-l and higher content of Nb, without addition of costly V, Ti and the like.
  • An object of this invention is to provide an Al-killed steel having a high yield point of more than 65,000 p.s.i. that can be produced with ease and stability.
  • Another object of this invention is to provide an Alkilled steel having excellent toughness in low temperature services.
  • FIG. 1 is a histograph showing the surface quality of ordinary steel
  • FIG. 2 is a histograph from cold ingot treatment
  • FIG. 3 is a histograph of the present invention ingot.
  • Steel of the present invention is produced as an Alkilled-steel.
  • surface cracks of a slab, which is shaped from said Al-killed ingot, are observed.
  • Such cracks are generated by the precipitation of AIN, which is formed -by the cooling of the surface layer of the hot ingot. It is needless to say that said precipitation goes on as the track time becomes longer.
  • it has been discovered that said generation of cracks can be avoided by means of adding low Si, instead of cold ingot treatment that is cooled to room temperature and then charged into a soaking pit. That is, a
  • Si is effective to prevent the ingot from precipitation of AIN at the cooling stage of said ingot.
  • the Si content of more than 0.15 has little effect on preventing the ingot from precipitation of AIN.
  • the Si content is less than 0,02% the steel increases in inclusion and results in dirty steel. A lowering of yield will be inevitable.
  • the C content of the present invention is limited to a range from 0.13 to 023%.
  • a C content of more than 0.13% is required in order that the tensile strength of more than 60 l g./mm.2 is kept with stability.
  • weldability of the steel will be lower. Such a steel is undesirable, because weldability of the steel is an important factor of the invention.
  • An Mn content of more than 1.5 makes weldability of the steel worse in connection with the C content.
  • the tensile strength of the steel including the Mn content of less than 12% becomes insufcient in connection with the
  • Nb added to steel lie in the precipitation effect in ferrite grain and grain refining effect by Nb carbide.
  • the best suited range of Nb content in the invention steel is from 0.01 to 0.05 Even though more than 0.05% Nb was added, larger effects cannot be expected, :because said effects amount to a saturated condition, and less than 001% Nb has no effect.
  • a Sol. Al content in the range from 0.02 to 0.05% has the highest grain refining effect. Even though said content was above 0.05 there is no said effect being in proportion to said content. When Sol. Al content is less than 0.02%, said grain refining effect cannot be expected.
  • FIG. 1 Axis of abscissas in said figures shows the rate of reduction of weight, which is based on the repairing operation, with a rank. Said reduction of weight shown as numeral l is less than 05%, numeral 2 is from 0.5 to 0.1%, numeral 3 is from 1.0 to 20%, numeral 4 is from 2.0 to 2.5 numeral 5 is more than 2.5 and numeral 0 is impossible to be repaired, which is scrapped.
  • This invention steel is possible to be widely utilized as structural materials, in addition to use as materials for line pipe.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
US45108A 1969-06-12 1970-06-10 Aluminum killed-steel Expired - Lifetime US3681057A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4574869 1969-06-12

Publications (1)

Publication Number Publication Date
US3681057A true US3681057A (en) 1972-08-01

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ID=12727917

Family Applications (1)

Application Number Title Priority Date Filing Date
US45108A Expired - Lifetime US3681057A (en) 1969-06-12 1970-06-10 Aluminum killed-steel

Country Status (8)

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US (1) US3681057A (fr)
CA (1) CA932990A (fr)
CH (1) CH513249A (fr)
DE (1) DE2028831A1 (fr)
FR (1) FR2046713B1 (fr)
GB (1) GB1312666A (fr)
NL (1) NL7008576A (fr)
ZA (1) ZA704007B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807990A (en) * 1968-09-11 1974-04-30 Nippon Steel Corp Low-alloy high-tensile strength steel
US3897279A (en) * 1972-05-16 1975-07-29 Algoma Steel Corp Ltd Method for the production of high strength notch tough steel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2819227C2 (de) * 1978-05-02 1984-06-14 Stahlwerke Peine-Salzgitter Ag, 3150 Peine Schweißbarer Manganstahl sowie Verfahren zum Schweißen dieses Manganstahles

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1301324A (fr) * 1961-07-03 1962-08-17 Molybdenum Corp Procédé de fabrication d'aciers au niobium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807990A (en) * 1968-09-11 1974-04-30 Nippon Steel Corp Low-alloy high-tensile strength steel
US3897279A (en) * 1972-05-16 1975-07-29 Algoma Steel Corp Ltd Method for the production of high strength notch tough steel

Also Published As

Publication number Publication date
CA932990A (en) 1973-09-04
CH513249A (fr) 1971-09-30
ZA704007B (en) 1971-01-27
FR2046713A1 (fr) 1971-03-12
GB1312666A (en) 1973-04-04
FR2046713B1 (fr) 1973-10-19
NL7008576A (fr) 1970-12-15
DE2028831A1 (de) 1970-12-23

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