Jfe Steel Corporation

Mitsubishi Denki Kabushiki Kaisha

Koichi Nakashima

Shigeki Kitsuya

Daichi Izumi

Yoichi Ito

Kazukuni Hase

Yuki Toji

Kentaro Tanaka

Katsuyuki Ichimiya

Norichika Aramaki

Akio Ohmori

Naoki Nakata

Keiji Ueda

Hirotoshi Yamada

Satoshi Igi

Minoru Suwa

Tomohiro Ono

Shin Hikino

Ryo Arao

The steel of the present disclosure contains, in mass %, C: 0.100% to 0.700%, Si: 0.05% to 1.00%, Mn: 20.0% to 40.0%, P: ≤0.030%, S: ≤0.0050%, Al: 0.01% to 5.00%, Cr: 0.5% to 7.0%, N: 0.0050% to 0.0500%, O: ≤0.0050%, Ti: ≤0.005%, Nb: ≤0.005%, and at least one selected from Ca: 0.0005% to 0.0100%, Mg: 0.0005% to 0.0100%, and REM: 0.0010% to 0.0200%, and has a microstructure with austenite as matrix, where an average grain size is 50 μm or less, a cleanliness of sulfide inclusion is less than 1.0%, a yield strength is 400 MPa or more, and a percent brittle fracture after a Charpy impact test at −269° C. is less than 5%.

Steel and method of producing same

Provided is a high-Mn steel having excellent low-temperature toughness and excellent surface characteristics. A high-Mn steel comprises: a chemical composition containing, in mass %, C: 0.100 to 0.700%, Si: 0.05 to 1.00%, Mn: 20.0 to 35.0%, P: ≤0.030%, S: ≤0.0070%, Al: 0.010 to 0.070%, Cr: 0.50 to 5.00%, N: 0.0050 to 0.0500%, O: ≤0.0050%, Ti: ≤0.005%, and Nb: ≤0.005%, with a balance consisting of Fe and inevitable impurities; and a microstructure having austenite as a matrix, wherein in the microstructure, a Mn concentration of a Mn-concentrated portion is 38.0% or less, and an average KAM value is 0.3 or more, yield stress is 400 MPa or more, absorbed energy vEin a Charpy impact test at −196° C. is 100 J or more, and percent brittle fracture is less than 10%.

High-Mn steel and method of producing same

The method for manufacturing a high-manganese steel cast slab according to the present invention includes manufacturing a cast slab by continuously casting a molten high-manganese steel having a specific chemical composition. In the manufacture, in a continuous-casting machine or during transportation before subsequent charging into a heating furnace for hot rolling, a processing strain is applied to the cast slab having a surface temperature of 600&#xb0; C. or higher and 1100&#xb0; C. or lower in such an amount that a processing strain amount calculated by a certain formula is 3.0% or more and 10.0% or less.

Method for manufacturing high-manganese steel cast slab and method for manufacturing high-manganese steel slab or steel sheet

Provided is a steel material for high heat input welding having excellent welding heat affected zone low-temperature toughness at &#x2212;55&#xb0; C. in the case that the steel material is welded by high heat input welding with a heat input of more than 80 kJ/cm. The steel material may be used in low-temperature storage tanks, for example. The steel material for high heat input welding includes, in mass %, C: 0.04 to 0.09%, Si: 0.15 to 0.25%, Mn: 1.40 to 2.00%, P: 0.015% or less, S: 0.0005 to 0.0040%, Al: 0.030 to 0.080%, Ti: 0.005 to 0.025%, B: 0.0003 to 0.0020%, Ca: 0.0005 to 0.0030%, N: 0.0030 to 0.0060%, O: 0.0040% or less, Nb: 0.005% or less, and Mo: 0.005% or less, the balance being Fe and incidental impurities.

Steel material for high heat input welding

A source clock regenerating section ( ) comprises an operating section ( ) for taking a weighted average value of a plurality of buffer remaining volumes H that have been sequentially detected, multiplying a predetermined sensitivity coefficient A to this weighted average value, and further adding a predetermined offset value, thereby to obtain a control value U for regenerating the source clock; and an operation control section ( ) for setting a local clock ( ) to a manipulated variable to be used for calculating the control value capable of converging to the source clock at a high speed during a period from when a source clock regeneration operation has started till when the local clock ( ) as a regeneration source clock satisfies a predetermined condition for coming closer to a source clock frequency, and for setting the local clock to the manipulated variable capable of stably regenerating the source clock after this predetermined condition has been satisfied.

Data receiving apparatus, a method of regenerating a source clock to be used for this, and a computer product

A communication device for transmitting a sequence of data, which is transmitted thereto at a given transmission rate, at a desired transmission rate greater than the former transmission rate over a transmission line. The device comprises a mapping unit, in order to map the sequence of data into a plurality of frames in a predetermined form, each of which consists of a plurality of blocks, for assigning a predetermined amount of data to a data transmission area in each of the plurality of blocks included in each frame so that the sequence of data is nearly-uniformly arranged over the plurality of blocks included in each frame. A control unit is provided for controlling the mapping unit in such a manner that the mapping unit provides a stuff area for a predetermined one of the plurality of blocks included in each frame and determines whether or not to map part of the sequence of data into the stuff area, so as to transmit the plurality of frames at the desired transmission rate, then maps either part of the sequence of data or null data into the stuff area according to a determination result, and provides a stuff present identifier indicating whether or not part of the sequence of data is mapped into the stuff area for each frame.

Communication device and method

Growing community of inventors

Tokyo, Japan

Koichi Nakashima