Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Honda Motor Co., Ltd.

Toshimi Tarui

Daisuke Hirakami

Manabu Kubota

Suguru Yoshida

Kenichi Nakamura

Jun Takahashi

Shingo Yamasaki

Hiroshi Sato

Seiki Nishida

Hideki Matsuda

Toshihiko Takahashi

Koki Mizuno

Hiroaki Sakamoto

Masayuki Hashimura

Mitsuru Morita

Masashi Sakamoto

Makoto Kosaka

Tadashi Ohya

Tetsushi Chida

Hirokatsu Yashiro

Junichi Kodama

Nobuyuki Shimoda

Ken-ichiro Naito

Masahiro Toda

Sakae Katayama

Hitoshi Tashiro

Syoji Sasaki

Disclosed is a high-strength Zn&#x2014;Al coated steel wire for bridges with excellent corrosion resistance and fatigue properties, the Zn&#x2014;Al coated steel wire includes: a steel wire; and a Zn&#x2014;Al coating having a coating body layer and an Fe&#x2014;Al alloy layer formed in an interface between a surface layer of the steel wire and the coating body layer, wherein a chemical composition of a core material of the steel wire includes, by mass %: C: 0.70% to 1.2%; Si: 0.01% to 2.5%; Mn: 0.01% to 0.9%; P: limited to 0.02% or less; S: limited to 0.02% or less; N: limited to 0.01% or less; and the balance including Fe and unavoidable impurities, wherein wire-drawn pearlite is most abundant microstructure among microstructures of the core material of the steel wire; wherein an average composition of the Zn&#x2014;Al coating includes, by mass %, Al: 3.0 to 15.0%; and Fe: limited to 3.0% or less, and wherein the Fe&#x2014;Al alloy layer has a thickness of 5 &#x3bc;m or less.

High-strength Zn&#x2014;Al coated steel wire for bridges with excellent corrosion resistance and fatigue properties and method for manufacturing the same

A steel which is excellent in delayed fracture resistance containing, by mass %, C: 0.10 to 0.55%, Si: 0.01 to 3%, and Mn: 0.1 to 2%, further containing one or more of Cr: 0.05 to 1.5%, V: 0.05 to 0.2%, Mo: 0.05 to 0.4%, Nb: 0.001 to 0.05%, Cu: 0.01 to 4%, Ni: 0.01 to 4%, and B: 0.0001 to 0.005%, and having a balance of Fe and unavoidable impurities, the structure being a mainly tempered martensite structure, the surface of the steel being formed with (a) a nitrided layer having a certain thickness range and a nitrogen concentration higher than the nitrogen concentration of the steel by 0.02 mass % or more and (b) a low carbon region having a certain depth range from the surface of the steel and having a carbon concentration of 0.9 time or less the carbon concentration of the steel.

High strength steel and high strength bolt excellent in delayed fracture resistance and methods of production of same

The present invention provides a steel for nitriding with a composition including, by mass %: C: 0.10% to 0.20%; Si: 0.01% to 0.7%; Mn: 0.2% to 2.0%; Cr: 0.2% to 2.5%; Al: 0.01% to less than 0.19%; V: over 0.2% to 1.0%; Mo: 0% to 0.54%; N: 0.001% to 0.01%; P limited to not more than 0.05%; S limited to not less than 0.2%; and a balance including Fe and inevitable impurities, the composition satisfying 2&#x2266;[V]/[C]&#x2266;10, where [V] is an amount of V by mass % and [C] is an amount of C by mass %, in which the steel for nitriding has a microstructure containing bainite of 50% or more in terms of an area percentage.

Steel for nitriding and nitrided part

A saw wire includes a steel wire () having a steel strand () with predetermined composition, an abrasive () fixed to the steel wire () by a fixing part (), and an intermetallic compound () on an interface between the abrasive () and the fixing part (). Tensile strength of the steel strand () is 3500 MPa or more, and the fixing part () includes a Sn-based solder containing Zn or Ag.

Saw wire

The invention provides a steel material with satisfactory hydrogen embrittlement resistance, and particularly it relates to high-strength steel with satisfactory hydrogen embrittlement resistance and a strength of 1200 MPa or greater, as well as a process for production thereof. At least one simple or compound deposit of oxides, carbides or nitrides as hydrogen trap sites which trap hydrogen with a specific trap energy is added to steel, where the mean sizes, number densities, and length-to-thickness ratios (aspect ratio) are in specific ranges. By applying the specific steel components and production process it is possible to obtain high-strength steel with excellent hydrogen embrittlement resistance.

High-strength steel material with excellent hydrogen embrittlement resistance

Steel and steel shaped articles with an excellent delayed fracture resistance and a tensile strength of the 1600 MPa class or more, containing, by mass %, C: 0.20 to 0.60%, Si: 0.50% or less, Mn: over 0.10% to 3%, Al: 0.005 to 0.1%, Mo: over 3.0% to 10%, and, as needed, one or more of W: 0.01 to 10%, V: 0.05 to 1%, Ti: 0.01 to 1%, Nb: 0.01 to 1%, Cr: 0.10 to 2%, Ni: 0.05 to 1%, Cu: 0.05 to 0.5%, and B: 0.0003 to 0.01%, and a balance of Fe and unavoidable impurities and, further, a method of production comprising shaping the above steel to a desired shape (for example, a bolt shape), quenching it, then tempering it at 500 to 750&#xb0; C. in temperature range.

Steel with excellent delayed fracture resistance and tensile strength of 1801 MPa class or more, and its shaped article

The present invention provides a high strength bolt excellent in delayed fracture resistance able to advantageously prevent hydrogen embrittlement as represented by the delayed fracture phenomenon occurring along with an increase in strength and causing a particular problem, and a method of production of the same, containing, by mass %, C: 0.2 to 0.6%, Si: 0.05 to 0.5%, Mn: 0.1 to 2%, Mo: 0.5 to 6%, and Al: 0.005 to 0.5%, having a tensile strength of 1400 MPa or more, and having a compressive residual stress of the surface layer of the thread root of 10 to 90% of the tensile strength. Further, a surface layer part of the thread root from the surface down to at least 50 &#x3bc;m has pre-austenite grains with an aspect ratio of the axial direction and radial direction of 2 or more and that part has a hardness of Hv 460 or more. Further, the method of production comprises using the steel material having the above ingredients to shape the bolt head and shaft, then heat the bolt to 900 to 1100&#xb0; C., quench it, temper it by a 580&#xb0; C. or higher temperature, then thread roll it.

High strength bolt excellent in delayed fracture resistance and method of production of same

Fine graphite uniform dispersion steel excellent in cold machinability,

High strength, ultra fine steel wire having excellent workability in

A method of directly softening a rolled machine structural steel is provided. This method is characterized by the fact that it comprises the steps of:

Method of directly softening rolled machine structural steels

A method of softening a rolled medium carbon machine structural steel is provided. This method is characterized by:

Method for softening rolled medium carbon machine structural steels

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Futtsu, Japan

Toshimi Tarui