Jfe Steel Corporation

Nkk Corporation

Nisshin Flour Milling Co., Ltd.

Koichiro Fujita

Hiroshi Hasegawa

Tatsuhiko Hiratani

Shoji Kasai

Yasushi Tanaka

Taro Kizu

Hideyuki Takahashi

Yoshitsugu Suzuki

Tadashi Inoue

Kozo Harada

Kohei Hasegawa

Shigehiro Takajo

Hironori Ninomiya

Hideyuki Kimura

Masatoshi Kumagai

Yoichi Makimizu

Gentaro Takeda

Mai Aoyama

Kenji Tahara

Yusuke Kimata

Kazuhiro Hanazawa

Eiko Yasuhara

Yoshikazu Takada

Misao Namikawa

Shinjirou Imai

Hideharu Koga

Masahide Morikawa

Makoto Ohashi

A method for producing high-strength galvanized steel sheets having excellent coating adhesion, workability and appearance. The method comprises hot rolling a slab comprising, by mass %, C: 0.05 to 0.30%, Si: 0.1 to 2.0% and Mn: 1.0 to 4.0%, then coiling the steel sheet into a coil at a specific temperature T, and pickling the steel sheet, cold rolling the hot-rolled steel sheet resulting from the hot rolling, annealing the cold-rolled steel sheet resulting from the cold rolling under specific conditions, and galvanizing the annealed sheet resulting from the annealing in a galvanizing bath containing 0.12 to 0.22 mass % Al.

Method and facility for producing high-strength galavanized steel sheets

A method for manufacturing a high-strength galvanized steel sheet includes performing hot rolling, cold rolling, first annealing, pickling, and second annealing. The first annealing is performed to obtain a steel sheet having a steel microstructure including ferrite in an amount of 10% or more and 60% or less in terms of area ratio, and martensite, bainite, and retained austenite in a total amount of 40% or more and 90% or less in terms of area ratio. The second annealing includes heating to an annealing temperature of 750&#xb0; C. or higher and 850&#xb0; C. or lower, holding at the annealing temperature for 10 seconds or more and 500 seconds or less, cooling at an average cooling rate of 1&#xb0; C./s or more and 15&#xb0; C./s or less, performing a galvanizing treatment, and cooling to a temperature of 150&#xb0; C. or lower at an average cooling rate of 5&#xb0; C./s or more and 100&#xb0; C./s or less.

Method for manufacturing high-strength galvanized steel sheet

Provided are a high-strength galvanized steel sheet containing 0.12% to 0.25% C, 0.01% to 1.00% Si, 1.5% to 4.0% Mn, 0.100% or less P, 0.02% or less S, 0.01% to 0.10% Al, 0.001% to 0.010% N, 0.005% to 0.100% Ti, and 0.0005% to 0.0050% B, the remainder being Fe and inevitable impurities, Ti&#x3e;4N being satisfied. The high-strength galvanized steel sheet contains 80% to 100% martensite in terms of area fraction, 5% or less (including 0%) polygonal ferrite in terms of area fraction, and less than 3% (including 0%) retained austenite in terms of area fraction. The average hardness of martensite is 400 to 500 in terms of Vickers hardness (Hv). The average grain size of martensite is 20 &#x3bc;m or less. The standard deviation of the grain size of martensite is 7.0 &#x3bc;m or less.

High-strength galvanized steel sheet excellent in stretch-flange formability, in-plane stability of stretch-flange formability, and bendability and method for manufacturing the same

A high-strength hot-dip galvanized steel sheet and a method for manufacturing the steel sheet are provided. The high-strength hot-dip galvanized steel sheet has a specific composition including C, Si, Mn, etc. In this chemical composition, the content of Ti [Ti] and the content of N [N] satisfy [Ti]&#x3e;4[N]. The high-strength hot-dip galvanized steel sheet has a microstructure including martensite at an area fraction of 60% or more and 90% or less, polygonal ferrite at an area fraction of more than 5% and 40% or less, and retained austenite at an area fraction of less than 3% (including 0%). The average hardness of the martensite is 450 or more and 600 or less in terms of Vickers hardness, and the average crystal grain diameter of the martensite is 10 &#x3bc;m or less. The standard deviation of the crystal grain diameters of the martensite is 4.0 &#x3bc;m or less.

High-strength hot-dip galvanized steel sheet and method for manufacturing the same

A method is provided for producing a high-strength galvanized steel sheet having a microstructure that contains martensite in an area proportion of 20% or more and 60% or less and ferrite in an area proportion of 40% or more and 80% or less includes, in sequence, hot-rolling a steel slab containing a specific component composition, performing cold rolling, performing primary annealing, performing pickling, performing secondary annealing, and performing galvanizing treatment, in which in the primary annealing, heating is performed at an average heating rate of 0.1&#xb0; C./sec. or more and less than 3&#xb0; C./sec. in the temperature range of 600&#xb0; C. to 750&#xb0; C., an annealing temperature of 750&#xb0; C. to 850&#xb0; C. is maintained for 10 to 500 seconds, and then cooling is performed from the annealing temperature range to a cooling stop temperature of 600&#xb0; C. or lower at an average cooling rate of 1 to 15&#xb0; C./sec, in which in the pickling, the pickling weight loss of the steel sheet is 0.05 to 5 g/min terms of Fe, in which in the secondary annealing, an annealing temperature of 750&#xb0; C. to 850&#xb0; C. is maintained for 10 to 500 seconds, and then cooling is performed from the annealing temperature at an average cooling rate of 1 to 15&#xb0; C./s, and in which after the galvanizing treatment, cooling is performed at an average cooling rate of 5 to 100&#xb0; C./sec.

Method for producing high-strength galvanized steel sheet and high-strength galvannealed steel sheet

A bake-hardening galvanized steel sheet having a base steel sheet and a coating layer formed on the base steel sheet, the base steel sheet having a specified chemical composition and a metallographic structure including a ferrite phase and a cementite phase, in which an average ferrite grain diameter is controlled to be 10 &#x3bc;m or more and 30 &#x3bc;m or less, and in which the surface area of the interface between ferrite and cementite per unit volume is controlled to be 1.0/mm or more and 10.0/mm or less, a hydrogen concentration in steel of the base steel sheet is controlled to be less than 0.1 ppm, and a zinc coating weight per unit surface area of the steel sheet is controlled to be 40 g/mor more and 100 g/mor less.

Bake-hardening galvanized steel sheet

A steel sheet and a method for producing the same are disclosed. The steel sheet has a composition containing 0.015% to 0.05% C, less than 0.10% Si, 0.1% to 2.0% Mn, 0.20% or less P, 0.1% or less S, 0.01% to 0.10% Al, 0.005% or less N, and 0.06% to 0.5% Ti in percent by mass, C and Ti satisfying the inequality Ti*/C&#x2267;4, where Ti* (mass percent)=Ti&#x2212;3.4N and Ti, C, and N represent the content (mass percent) of each element. The steel sheet has a microstructure which contains a ferrite phase as a base, in which the average grain diameter of the ferrite phase is 7 &#x3bc;m or more, and in which the ratio of the rolling-direction average grain diameter to thickness-wise average grain diameter of the ferrite phase is 1.1 or more.

Steel sheet with excellent aging resistance property and method for producing the same

A cold-rolled steel sheet includes, on a percent by mass basis: C: 0.0010% to 0.0030%, Si: 0.05% or less, Mn: 0.1% to 0.3%, P: 0.05% or less, S: 0.02% or less, Al: 0.02% to 0.10%, N: 0.005% or less, and Nb: 0.010% to 0.030% and the remainder composed of Fe and incidental impurities, wherein values in a rolling direction and a direction perpendicular to the rolling direction are within a range of 1.0 to 1.6, and a mean value Elof elongations in the rolling direction, a direction at 45&#xb0; with respect to the rolling direction, and the direction perpendicular to the rolling direction is 40% or more, where El=(El+2&#xd7;El+El)/4 and El: elongation in the rolling direction, El: elongation in the direction at 45&#xb0; with respect to the rolling direction, and El: elongation in the direction perpendicular to the rolling direction.

Cold-rolled steel sheet, method for manufacturing the same, and backlight chassis

The present invention provides a protein of the following formula (I) having immunomodulatory activity: X-Y-Z (I) wherein X represents an amino acid sequence of SEQ ID NO: 1 or 2, each of Y and Z is absent or represents an amino acid sequence of SEQ ID NO: 1 or 2. The above protein is derived from helminth and can be used to treat various immune diseases due to its immunomodulatory activity. The above protein can also be used to treat various allergic diseases due to is ability to stimulate the production of non-specific IgE.

Proteins having immunomodulatory activity and remedies for immunological diseases

A silicon steel sheet contains 0.01 wt. % or less C, 4 to 10 wt. % Si, 0.5 wt. % or less Mn, 0.01 wt. % or less P, 0.01 wt. % or less S, 0.2 wt. % or less sol. Al, 0.01 wt. % or less N, 0.02 wt. % or less O and the balance being Fe. The silicon steel sheet has grain boundaries and carbides which are precipitated on the grain boundaries. The carbides have an area of 20% or less to an area of the grain boundaries. The steel sheet is cooled at a cooling speed of 5&deg; C./sec. or more in a temperature range of from 300 to 700&deg; C.

Silicon steel sheet and method thereof

A silicon steel sheet contains 0.01 wt. % or less C, 4 to 10 wt. % Si, 0.5 wt. % or less Mn, 0.01 wt. % or less P, 0.01 wt. % or less S, 0.2 wt. % or less sol. Al, 0.01 wt. % or less N, 0.02 wt. % or less O and the balance being Fe. The silicon steel sheet has grain boundaries and carbides which are precipitated on the grain boundaries. The carbides have an area of 20% or less to an area of the grain boundaries. The steel sheet is cooled at a cooling speed of 5.degree. C./sec. or more in a temperature range of from 300 to 700.degree. C.

A soft magnetic alloy sheet has low residual magnetic flux density. The alloy sheet comprises a base element and an alloying element having a concentration gradient in a thickness direction of the alloy sheet. The alloying element is selected from Si, Al, Ni, Co and Fe.

Soft magnetic alloy sheet having low residual magnetic flux density

A silicon steel sheet contains 0.01 wt. % or less C, 4 to 10 wt. % Si, 0.5 wt. % or less Mn, 0.01 wt. % or less P, 0.01 wt. % or less S, 0.2 wt. % or less sol. Al, 0.01 wt. % or less N, 0.02 wt. % or less 0 and the balance being Fe. The silicon steel sheet has grain boundaries and carbides which are precipitated on the grain boundaries. The carbides have an area of 20% or less to an area of the grain boundaries. The steel sheet is cooled at a cooling speed of 5.degree. C./sec. or more in a temperature range of from 300 to 700.degree. C.

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Nagoya, Japan

Koichiro Fujita