The Japan Steel Works, Ltd.

Mitsubishi Chemical Corporation

Tohoku University

Other

The Kansai Electric Power Co., Inc.

Tohru Ishiguro

Makoto Saito

Rinzo Kayano

Yuji Kagamitani

Shigefusa Chichibu

Quanxi Bao

Mutsuo Ueda

Chiaki Yokoyama

Daisuke Tomida

Tsukasa Azuma

Masahiko Morinaga

Yoshinori Murata

Ryokichi Hashizume

Kazuhiro Miki

Junji Itagaki

A first object of the present invention is to provide a method for efficiently growing a nitride single crystal even under low pressure conditions. The present invention relates to a method for producing a nitride single crystal, comprising growing a nitride crystal on the surface of a seed crystal having a hexagonal crystal structure by setting a pressure in a reaction vessel having the seed crystal, a nitrogen-containing solvent, a mineralizer containing a fluorine atom, and a raw material placed therein to 5 to 200 MPa and performing control so that the nitrogen-containing solvent is in at least either a supercritical state or a subcritical state.

Method for producing nitride single crystal using nitrogen-containing solvent, mineralizer having fluorine atom, and raw material

Method for producing nitride single crystal

In the thermal power system, the electricity production efficiency may be improved by providing turbine members having the improved high temperature characteristic over the corresponding prior art turbine members. Turbine members may be provided by using high resistant steels composed of any one or ones selected from the group consisting of the components, including 0.08 to 0.13% of carbon (C), 8.5 to 9.8% of chromium (Cr), 0 to 1.5% of molybdenum (Mo), 0.10 to 0.25% of vanadium (V), 0.03 to 0.08% of niobium (Nb), 0.2 to 5.0% of tungsten (W), 1.5 to 6.0% of cobalt (Co), 0.002 to 0.015% of boron (B), 0.015 to 0.025% of nitrogen (N), and optionally, 0.01 to 3.0% of rhenium (Re), 0.1 to 0.50% of silicon (Si), 0.1 to 1.0% of manganese (Mo), 0.05 to 0.8% of nickel (Ni) and 0.1 to 1.3% of cupper. The long-time creep strength may be improved by using those high resistant steels for turbine rotors, turbine members and the like, which enable the steam temperature to be higher, thereby improving the electricity production efficiency in the thermal power system. The accelerated creep inhibitor parameter is provided for controlling the reduction in the creep strength so that the high creep strength can be maintained for the extended period of time.

High Cr ferritic heat resistance steel

A weld overlaid stainless clad steel for high temperature and high pressure hydrogen service has the improved elevated temperature strength and excellent resistance to hydrogen induced disbonding. The base steel of the clad steel in the invention contains, in weight percent, 0.05% to 0.30% carbon, not more than 1.5% manganese, 0.8% to 5.5% chromium, 0.5% to 1.5% molybdenum and 0.0005% to 0.010% boron, at least one of 0.010% to 0.040% titanium, 0.010% to 0.040% columbium, with the balance of iron and any other incidental impurities.

Overlaid stainless clad steels with improved resistance to hydrogen

Growing community of inventors

Miyagi, Japan

Tohru Ishiguro