US3664830A - High tensile steel having high notch toughness - Google Patents

High tensile steel having high notch toughness Download PDF

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Publication number
US3664830A
US3664830A US46475A US3664830DA US3664830A US 3664830 A US3664830 A US 3664830A US 46475 A US46475 A US 46475A US 3664830D A US3664830D A US 3664830DA US 3664830 A US3664830 A US 3664830A
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US
United States
Prior art keywords
steel
high tensile
aluminum
notch toughness
tensile steel
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.)
Expired - Lifetime
Application number
US46475A
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English (en)
Inventor
Akira Kambayashi
Shun-Ichi Shimada
Takashi Ehara
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
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 Kokan Ltd filed Critical Nippon Kokan Ltd
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Publication of US3664830A publication Critical patent/US3664830A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N

Definitions

  • the steel of the invention comprises 0.12-0.21% of carbon, 0.70l.00% of manganese, 0.20-0.35% of silicon, 0.400.65% of chromium, 0.l50.25% of molybdenum, 0.030.08% of vanadium, 0.01-0.03% of titanium, 0.00050.005% of boron, 0.020-0.060% of aluminum, ODDS-0.020% of nitrogen and the balance being iron and impurities. It is treated by hardening and tempering to provide a steel with a yield point of more than 70 kg./mrn. a tensile strength of more than 80 kg./mm. and an excellent notch toughness and weldability.
  • the present invention provides a steel which has both the high tensile strength and the notch toughness of the known steel containing expensive nickel, but at a lower cost and on an industrial scale.
  • the steel after nitrogen and aluminum addition, is hardened and tempered to precipitate nitrided aluminum.
  • the upper limit of the aluminum content is set at 0.060%. This is because more than 0.060% of aluminum is likely to harm the purity of steel.
  • the upper limit of the content of nitrogen is set at 0.020% to fix the same with respect to the above-mentioned upper limit of the aluminum content.
  • the lower limit of the aluminum content is set at 0.020%. This is because less than 0.020% of aluminum cannot be expected to achieve deoxidation of the steel and complete fixation of solidified nitrogen.
  • the lower limit of the nitrogen content is set at 0.008% bearing in mind the relationship between the amount of added aluminum and the required amount of nitrided aluminum.
  • Table 1 shows an example of the chemical composition of a steel of the present invention, the balance being iron and impurities
  • Table 2 shows the mechanical properties of a steel obtained by rolling the steel shown in Table 1 into a plate of gauge 25 mm. and by a heat-treatment comprising hardening and tempering.
  • the materials subjected to the impact test contained a. 2 mm. V-shaped notch.
  • the steel of this invention is superior to known high tensile steels both in yield point and tensile strength. In addition, it possesses a high notch toughness even at a temperature of 60 C. Consequently, the steel of this invention is comparable to known expensive high tensile steel containing nickel and is very useful for low-temperature service as a high tensile steel.
  • a high tensile steel comprising 0.l2-0.21% of carbon, 0.701.00% of manganese, 0.20-0.35% of silicon, 0.400.65% of chromium, 0.15-0.25 of molybdenum, 0.030.08% of vanadium, 0.01-0.03% of titanium, 0.00050.005% of boron, 0.020-0.060% of aluminum, 0.008-0.020% of nitrogen and the balance being iron and impurities, and treated by hardening and tempering.
  • a high tensile steel comprising 0.17% carbon, 0.93% manganese, 0.26% silicon, 0.63% chromium, 0.24% molybdenum, 0.04% vanadium, 0.01% titanium, 0.002% boron, 0.040% aluminum, 0.012% nitrogen, the balance being iron and impurities.

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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)
US46475A 1969-06-21 1970-06-15 High tensile steel having high notch toughness Expired - Lifetime US3664830A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4879469 1969-06-21

Publications (1)

Publication Number Publication Date
US3664830A true US3664830A (en) 1972-05-23

Family

ID=12813122

Family Applications (1)

Application Number Title Priority Date Filing Date
US46475A Expired - Lifetime US3664830A (en) 1969-06-21 1970-06-15 High tensile steel having high notch toughness

Country Status (8)

Country Link
US (1) US3664830A (xx)
AU (1) AU1649570A (xx)
CH (1) CH510739A (xx)
DE (1) DE2030400A1 (xx)
FR (1) FR2052823A5 (xx)
GB (1) GB1277996A (xx)
NL (1) NL7009093A (xx)
ZA (1) ZA704132B (xx)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025368A (en) * 1974-06-08 1977-05-24 Kawasaki Steel Corporation Weldable steel excellent in the toughness of the bond in a single layer welding with a large heat-input
US4062705A (en) * 1973-07-31 1977-12-13 Nippon Steel Corporation Method for heat treatment of high-toughness weld metals
US4537644A (en) * 1981-09-28 1985-08-27 Nippon Steel Corporation High-tension high-toughness steel having excellent resistance to delayed fracture and method for producing the same
US4561888A (en) * 1982-11-02 1985-12-31 Kabushiki Kaisha Kobe Seiko Sho Welding wire for use in submerged arc welding of Cr-Mo steels
US4634476A (en) * 1985-05-03 1987-01-06 Paccar Inc High-strength, low-alloy cast steel
US5525167A (en) * 1994-06-28 1996-06-11 Caterpillar Inc. Elevated nitrogen high toughness steel article
US6224825B1 (en) * 1997-04-29 2001-05-01 Ovako Steel Ab Case hardening steel
CN102618777A (zh) * 2012-04-19 2012-08-01 浙江大学宁波理工学院 一种改善铸铁高速切削性能的方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2396805A2 (fr) * 1977-07-06 1979-02-02 Ugine Aciers Aciers a caracteristiques mecaniques ameliorees par additions controlees de b, al, n et ti

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062705A (en) * 1973-07-31 1977-12-13 Nippon Steel Corporation Method for heat treatment of high-toughness weld metals
US4025368A (en) * 1974-06-08 1977-05-24 Kawasaki Steel Corporation Weldable steel excellent in the toughness of the bond in a single layer welding with a large heat-input
US4537644A (en) * 1981-09-28 1985-08-27 Nippon Steel Corporation High-tension high-toughness steel having excellent resistance to delayed fracture and method for producing the same
US4561888A (en) * 1982-11-02 1985-12-31 Kabushiki Kaisha Kobe Seiko Sho Welding wire for use in submerged arc welding of Cr-Mo steels
US4634476A (en) * 1985-05-03 1987-01-06 Paccar Inc High-strength, low-alloy cast steel
US5525167A (en) * 1994-06-28 1996-06-11 Caterpillar Inc. Elevated nitrogen high toughness steel article
US6224825B1 (en) * 1997-04-29 2001-05-01 Ovako Steel Ab Case hardening steel
CN102618777A (zh) * 2012-04-19 2012-08-01 浙江大学宁波理工学院 一种改善铸铁高速切削性能的方法
CN102618777B (zh) * 2012-04-19 2013-05-01 浙江大学宁波理工学院 一种改善铸铁高速切削性能的方法

Also Published As

Publication number Publication date
CH510739A (fr) 1971-07-31
ZA704132B (en) 1971-09-29
DE2030400A1 (de) 1971-04-29
FR2052823A5 (xx) 1971-04-09
AU1649570A (en) 1972-06-01
NL7009093A (xx) 1970-12-23
GB1277996A (en) 1972-06-14

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