Nippon Steel Sumitomo Metal Corporation

Nippon Steel Corporation

Other

Nippon Steel & Sumikin Coated Sheet Corporation

Yasuhide Morimoto

Masao Kurosaki

Masafumi Azuma

Nobuhiro Fujita

Akihiro Miyasaka

Manabu Takahashi

Jun Maki

Hiroshi Kanai

Kazuhiko Honda

Nobuyuki Shimoda

Kazumi Nishimura

Yoshihiro Suemune

Satoshi Arai

Noriyuki Suzuki

Kazutoshi Takeda

Koichi Nose

Kiyokazu Ishizuka

Osamu Goto

Kohei Tokuda

Kohei Ueda

Toshiki Nonaka

Satoru Tanaka

Hidetoshi Shindo

Hiroyasu Furukawa

Hiromasa Nomura

Tooru Oohashi

Shiro Fujii

Masaaki Sugiyama

Nobuki Shiragaki

Yoshikazu Yamanaka

The hot-dip aluminum alloy plated steel has a base steel and a plated layer, in which the composition of the plated layer contains, by % by mass, Fe: 25% to 75%, Mg: 2% to 20%, and Ca: 0.02% to 2% with a remainder of Al and inevitable impurities, the plated layer contains one or both of an &#x3b1;-Mg phase and an AlMgphase, and the sum of the partial volume fraction of the &#x3b1;-Mg phase and the partial volume fraction of the AlMgphase in a range of a depth of 5 &#x3bc;m from a surface of the plated layer is 1% to 40%.

Hot-dip aluminum alloy plated steel having excellent shear cut edge corrosion resistance and processed part corrosion resistance, and method of manufacturing the same

Provided is a galvanized steel sheet having a tensile strength of 770 MPa or more including a steel sheet portion, and a plated layer formed on the surface of the steel sheet portion, in which the plated layer is a galvanized plated layer or an galvannealed plated layer, the steel sheet portion has a soft layer that directly adjoins the interface with the plated layer and an inside layer that is other than the soft layer, the thickness D of soft layer is 0.001% to 5% of thickness t of the steel sheet portion, and, when the hardness of the soft layer measured by nano-indentation method is indicated by H1, and the representative hardness of the steel sheet portion measured by the nano-indentation method is indicated by Ha in cross section that goes along the thickness direction of the steel sheet portion, H1 is 5% to 75% of Ha.

High-strength galvanized steel sheet and method of manufacturing the same

The present invention provides a hot-dipped steelthat demonstrates favorable corrosion resistance and formability, and has a favorable appearance of a plating layer. The hot-dipped steel of the present invention includes a steel substrate formed thereon with an aluminum-zinc alloy plating layer. The aluminum-zinc alloy plating layer contains Al, Zn, Si and Mg as constituent elements thereof and the Mg content is 0.1% to 10% by weight. The aluminum-zinc alloy plating layer contains 0.2% to 15% by volume of an Si&#x2014;Mg phase, and the weight ratio of Mg in the Si&#x2014;Mg phase to the total weight of Mg is 3% or more.

Hot-dipped steel and method of producing same

A non-oriented magnetic steel sheet contains, by mass %, C: 0.005% or less; Si: 2% to 4%; Mn and V: totally 11% or less; and Al: 3% or less, with the balance being Fe and inevitable impurities, wherein a Mn concentration (mass %) and a V concentration (mass %) in a thickness direction satisfy the following formula. 0.1&#x3c;(Xs&#x2212;Xc)/t&#x3c;100, where Xs: a sum of the Mn concentration (mass %) and the V concentration (mass %) at a surface of the steel sheet, Xc: a sum of the Mn concentration (mass %) and the V concentration (mass %) at a center of the steel sheet, and t: a depth (mm), from the surface of the steel sheet, of a position where the sum of the Mn concentration (mass %) and the V concentration (mass %) is equal to Xc.

Non-oriented magnetic steel sheet and method for producing the same

The present invention provides a Zn&#x2014;Al&#x2014;Mg&#x2014;Cr alloy-coated steel material with excellent corrosion resistance. A molten Zn&#x2014;Al&#x2014;Mg&#x2014;Si&#x2014;Cr alloy-coated steel material which is a steel material having a Zn&#x2014;Al&#x2014;Mg&#x2014;Cr alloy coating layer and which has an interfacial alloy layer formed of coating layer components and Fe at the coating layer-steel material interface, wherein the interfacial alloy layer has a multilayer structure consisting of an Al&#x2014;Fe-based alloy layer and an Al&#x2014;Fe&#x2014;Si-based alloy layer and furthermore, the Al&#x2014;Fe&#x2014;Si-based alloy layer contains Cr.

Hot-dip Zn&#x2014;Al&#x2014;Mg&#x2014;Si&#x2014;Cr alloy-coated steel material with excellent corrosion resistance

The present invention provides: a high-strength high-ductility hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having high fatigue resistance and corrosion resistance; a high-strength hot-dip galvanized steel sheet excellent in ductility, which improves non-plating defects and plating adhesion after severe deformation, and a method of producing the same; a high-strength and high-ductility hot-dip galvanized steel sheet having high fatigue resistance and corrosion resistance; a high-strength hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having superior appearance and workability, which suppresses the generation of non-plating defects, and a method of producing the same; and a high-strength hot-dip galvannealed steel sheet and a high-strength hot-dip galvanized steel sheet, which suppress non-plating defects and surface defects and have both corrosion resistance, in particular corrosion resistance in an environment containing chlorine ion, and high ductility, and a method of producing the same.

High-strength hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having fatigue resistance, corrosion resistance, ductility and plating adhesion, after severe deformation, and a method of producing the same

High-strength hot-dip galvanized steel sheet and hot-dip galvannealed steel sheet having fatigue resistance corrosion resistance ductility and plating adhesion after servere deformation and a method of producing the same

A Zn&mdash;Al&mdash;Mg&mdash;Si alloy-plated steel material with excellent corrosion resistance, characterized by comprising, in terms of wt %, Al: at least 45% and no greater than 70%, Mg: at least 3% and less than 10%, Si: at least 3% and less than 10%, with the remainder Zn and unavoidable impurities, wherein the Al/Zn ratio is 0.89-2.75 and the plating layer contains a bulky Mg Si phase; also, a Zn&mdash;Al&mdash;Mg&mdash;Si alloy-plated steel material with excellent corrosion resistance, characterized by comprising, in terms of wt %, Al: at least 45% and no greater than 70%, Mg: at least 1% and less than 5%, Si: at least 0.5% and less than 3%, with the remainder Zn and unavoidable impurities, wherein the Al/Zn ratio is 0.89-2.75 and the plating layer contains a scaly Mg Si phase.

Zn-Al-Mg-Si-alloy plated steel product having excellent corrosion resistance and method for preparing the same

A coated steel material excellent in corrosion resistance and a method of producing the same, wherein a coated steel material has on the surface of the steel sheet a Zn-alloy coating layer containing 1-10 wt % of Mg, 2-19 wt % of Al and 0.01-2 wt % of Si, where Mg and Al satisfy Mg (%)&plus;Al (%)&lE;20%, the balance being Zn and unavoidable impurities, and has a coating layer structure of a Mg intermetallic compound or the like. As a base metal treatment, it is preferably provided with a Ni coating layer. The coated Zn-alloy coated steel sheet may have provided on the coating layer, as an intermediate layer, a chromate film layer, and, as an upper layer, an organic coating layer. The Zn-alloy coating layer may further contain one or more of 0.01-1 wt % of In, 0.01-1 wt % of Bi and 1-10 wt % of Sn. The coated steel material may be painted.

-Zn coated steel material, ZN coated steel sheet and painted steel sheet excellent in corrosion resistance, and method of producing the same

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Tokyo, Japan

Yasuhide Morimoto