US3795506A - Nonthermal refining type high tension steel exhibiting excellent cold-work-ability - Google Patents

Nonthermal refining type high tension steel exhibiting excellent cold-work-ability Download PDF

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Publication number
US3795506A
US3795506A US00245351A US3795506DA US3795506A US 3795506 A US3795506 A US 3795506A US 00245351 A US00245351 A US 00245351A US 3795506D A US3795506D A US 3795506DA US 3795506 A US3795506 A US 3795506A
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Prior art keywords
steel
workability
nonthermal
strength
cold
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Expired - Lifetime
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US00245351A
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English (en)
Inventor
T Yamaguchi
H Gonda
A Nishimoto
Y Ikegami
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JFE Engineering Corp
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Nippon Kokan Ltd
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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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Definitions

  • a nonthermal refining type high tension steel substantially consisting of 0.05 to 0.15% C and complex addition of 0.01 to 0.10% Nb, 0.03 to 0.15% Ti and 0.05 to 0.15% Zr, unavoidable impurities and remainder Fe, eX- hibits high tensile strength of more than 60 kg./mm. or yield stress of more than 45 kg./mm. and excellent coldworkability.
  • This invention relates to a novel nonthermal refining type high tension steel exhibiting excellent cold-workability, and more particularly such steel having high tensile strength or yield stress and exhibiting excellent coldworkability.
  • a high tension steel having tensile strength of 60 kg./ mm. 70 kg./mm. or 80 kg./mm. has already been developed and used.
  • a number of steels has been developed which aims to improve cold-workability.
  • no steel has been developed which exhibits both excellent cold-workability simultaneously with high tensile strength of 70 kg./mm. or 80 kg./mm. grade.
  • a steel were developed exhibiting both high strength and excellent workability, it could be used in numerous instances, such as for use as a beam of a crane, a frame of autotrucks, a container material or a structural material for autos and other vehicles, etc. These uses require such properties as high strength, good cold-workability, good flatness, good weldability, high impact value and low cost.
  • This invention encompasses a low C-Nb-Ti-Zr system composition.
  • the chemical composition of this inventive steel substantially consists of, as the inventive portion thereof, 0.05 to 0.15% (by weight, the same holding herein) C and coexistence of 0.01 to 0.10% Nb, 0.03 to 0.15% Ti and 0.05 to 0.15 Zr.
  • 0.10 to 1.00% Si, 0.80 to 1.80% Mn and 0.01 to 0.10 sol. Al are included in steel.
  • One or more elements selected from the group consisting of 0.10 to 0.50% Cr, 0.10 to 0.50% Cu, 0.10 to 0.50% M0, 003 to 0.20% V and 0.10 to 0.50% Ni can be further added. Unavoidable impurities may be present and the remainder is Fe.
  • the inventive steel may be as rolled without any thermal refining treatment, and advantageously, has the excellent mechanical properties of high strength, good weldability, good coldworkability, good flatness, high impact strength, and low cost.
  • An object of the invention is to provide a non-thermal refining type high tension steel exhibiting excellent coldworkability simultaneously with high tensile strength.
  • Another object of this invention is to provide a nonthermal refining type high tension steel exhibiting good flatness of surface, good weldability and high impact value as well as excellent cold-workability and high strength as rolled without thermal treatments.
  • FIG. 1 depicts a graph showing change of impact properties with content of Ti or Zr
  • FIG. 2 depicts a graph showing the relationship between content of Ti or Zr and notch elongation
  • FIG. 3 depicts a graph showing the relationship between tensile strength and notch elongation.
  • This invention encompasses steels having the following composition: C, 0.05 to 0.15%; Mn, 0.80 to 1.80%; Ti, 0.03 to 0.15%; sol. Al, 0.010 to 0.100%; Si, 0.10 to 1.00%; Nb, 0.01 to 0.10%; Zr, 0.05 to 0.15%; unavoidable impurities and remainder iron.
  • composition is preferred embodiment.
  • one or more elements selected from the following group of elements may be further added: Cr, 0.10 to 0.50%; Mo, 0.10 to 0.50%; Ni, 0.10 to 0.50%; Cu, 0.10 to 0.50% and V, 0.03 to 0.20%.
  • Cr 0.10 to 0.50%
  • Mo 0.10 to 0.50%
  • Ni 0.10 to 0.50%
  • Cu 0.10 to 0.50%
  • V 0.03 to 0.20%.
  • Ti is added to improve the strength and simultaneously the absorption energy level becomes lower with the same therewith to play a part in adjusting formation of sulfide tendency as shown in the case of less than 0.05 in steel.
  • the Of 1685 than ShQWS little In 2 changes of notch elongation substan. eifect and the addmg more tha11 015% raPldly tially corresponds to cold-workability, depending upon makes the cold-workability and impact properties worse.
  • Ti or Zr content are Shown The relationship of Nb Ti 15 added to mamly, formmg f Sulfide and Zr content is in the same manner as that of FIG. 1.
  • the S content is a p y r011111; l-Tandern Hot Rolling Mill suitable means for Obtaining same. Hot rolling requtions-ordmary TABLE I C Si Mn P 8 Nb Ti Zr Sol-Al Others 0. eq.
  • Steels A to D are comparative steels.
  • No'rE.Finishing thickness 6.0 mm, to 10.0 mm.; Coiling requirements, ordinary.
  • the mechanical properties of the above steels are least 60 kg./mm. consisting essentially of at least 0.05
  • the strength of steels including less than 0.01% S is superior to that of other steels. Moreover, production cost is low because among other reasons, the steel may be used as only rolled. There is no need for any thermal treatments.
  • the strength may be further improved by adding one or more elements such as Cr, Cu, Mo, V or Ni.
  • Nonthermal refiningtype high tension steel exhibiting excellent cold-workability and tensile strength of at to 0.15% C; 0.01 to 0.10% Nb; 0.03 to 0.15% Ti; 0.05 to 0.15% Zr, unavoidable impurities and remainder Fe.
  • Composition of claim 2 further comprising one or more of the elements selected from the group consisting of 0.10 to 0.50% Cr; 0.10 to 0.50% Cu; 0.10 to 0.50% Mo; 0.03 to 0.20% V and 0.10 to 0.50% Ni.

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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 Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Articles (AREA)
US00245351A 1971-04-20 1972-04-19 Nonthermal refining type high tension steel exhibiting excellent cold-work-ability Expired - Lifetime US3795506A (en)

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JP2494671 1971-04-20

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US3795506A true US3795506A (en) 1974-03-05

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US00245351A Expired - Lifetime US3795506A (en) 1971-04-20 1972-04-19 Nonthermal refining type high tension steel exhibiting excellent cold-work-ability

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US (1) US3795506A (enExample)
AU (1) AU458096B2 (enExample)
BE (1) BE782354A (enExample)
CA (1) CA960489A (enExample)
DE (1) DE2219456A1 (enExample)
FR (1) FR2133952B1 (enExample)
GB (1) GB1344204A (enExample)
IT (1) IT955174B (enExample)
NL (1) NL150851B (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE31251E (en) * 1976-04-12 1983-05-24 Nippon Steel Corporation Process for producing a high tension steel sheet product having an excellent low-temperature toughness with a yield point of 40 kg/mm2 or higher
US4405388A (en) * 1982-04-05 1983-09-20 United States Steel Corporation Strengthening response in columbium-containing high-strength low-alloy steels
US5516373A (en) * 1995-02-21 1996-05-14 Usx Corporation High performance steel strapping for elevated temperature service and method thereof

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2900022C3 (de) * 1979-01-02 1981-12-03 Estel Hoesch Werke Ag, 4600 Dortmund Verfahren zum Herstellen von Profilen
JP3219820B2 (ja) * 1991-12-27 2001-10-15 川崎製鉄株式会社 低降伏比高強度熱延鋼板およびその製造方法
FR2735498B1 (fr) * 1995-06-15 1997-07-11 Lorraine Laminage Procede de realisation d'une bande de tole d'acier laminee a chaud a haute limite d'elasticite utlisable notamment pour la mise en forme

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1418471A (fr) * 1963-12-05 1965-11-19 Ishikawajima Harima Heavy Ind Procédé de fabrication d'acier et produits conformes à ceux obtenus par le présent procédé ou procédé similaire

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE31251E (en) * 1976-04-12 1983-05-24 Nippon Steel Corporation Process for producing a high tension steel sheet product having an excellent low-temperature toughness with a yield point of 40 kg/mm2 or higher
US4405388A (en) * 1982-04-05 1983-09-20 United States Steel Corporation Strengthening response in columbium-containing high-strength low-alloy steels
US5516373A (en) * 1995-02-21 1996-05-14 Usx Corporation High performance steel strapping for elevated temperature service and method thereof

Also Published As

Publication number Publication date
GB1344204A (en) 1974-01-16
FR2133952A1 (enExample) 1972-12-01
AU4142172A (en) 1973-10-25
BE782354A (fr) 1972-08-16
IT955174B (it) 1973-09-29
DE2219456A1 (de) 1972-11-02
FR2133952B1 (enExample) 1974-09-27
CA960489A (en) 1975-01-07
NL7205224A (enExample) 1972-10-24
AU458096B2 (en) 1975-02-20
NL150851B (nl) 1976-09-15

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