Kawasaki Steel Corporation

Doryokuro Kakunenryo Kaihatsu Jigyodan

Tomoo Tanaka

Masahiko Morita

Osamu Hashimoto

Susumu Sato

Koichi Hashiguchi

Minoru Nishida

Yutaka Oka

Yoshio Nakazato

Syuzo Ueda

Naohiko Soeda

Kiyohiko Nohara

Shunichi Yuhara

Junichi Mano

Osamu Masuko

Terufumi Sasaki

Tokushi Funakoshi

Koji Sanbongi

Syoichi Takizawa

Nobuo Aoyagi

A method of producing metallic materials for the components of nuclear reactors is disclosed, which comprises adding a boron-=containing material having a value of .sup.11 B/(.sup.10 B+.sup.11 B) larger than that of natural boron to molten metal before deboronification refining. The resulting metallic materials are used even under neutron irradiation without causing .sup.10 B(n, .alpha.).sup.7 Li nuclear reaction.

Method of producing metallic materials for the components of nuclear

A system for online-detection of a transformation value and/or a flatness of a steel or a magnetic material includes: an exciting coil disposed at either side of the plate-shaped steel or magnetic material and capable of generating alternating magnetic fluxes by alternating current excitations; two or more detecting coils arranged on the same side as the exciting coil and at positions different in distance from the exciting coil, and mutually induced with the exciting coil; and an arithmetic unit for obtaining the transformation value and the flatness of the steel or the magnetic material or either one of those from a difference between detection signals generated from a difference in values of interlock magnetic fluxes in the respective detecting coils. The transformation value and the flatness of the steel or the flatness of the magnetic material can be detected with high accuracy.

System for online-detection of the transformation value and/or flatness

Method for producing hot-rolled steel sheets having a low yield ratio

Method of producing non-ageing cold rolled steel sheets

High tensile strength steel sheets having high press formability and excellent shape-fixability in which an average roughness in surface Ha is 0.4-1.8 .mu.m, PPI value is more than 80 at a cut off level of 0.5 .mu.m, the proportional limit stress is less than 20 kg/mm.sup.2 and the microstructure consists of ferrite grains dispersed with fine martensite islands, are produced by cold rolling a hot rolled steel sheet containing 0.005-0.15% of carbon, and manganese, if necessary boron, molybdenum, chromium, silicon, nickel and copper within a range of 0.27-3% of Mneq. shown by the following formula (1)

High tensile strength steel sheets having high press-formability and a

A weldable steel excellent in the toughness of the bond in a single layer welding with a large heat-input more than 60,000 J/cm, which contains 0.03 to 0.22% of carbon, 0.02 to 0.80% of silicon and 0.40 to 2.00% of manganese in coexistance of 0.005 to 0.1% of rare earth metal and 0.0005 to 0.01% of boron, the remainder being substantially iron. Said weldable steel can be further improved by containing at least one of not more than 0.1% of niobium, not more than 0.1% of vanadium, not more than 0.5% of copper, not more than 1.0% of nickel, not more than 0.8% of chromium, not more than 0.5% of molybdenum, not more than 0.1% of selenium, not more than 0.1% of aluminum, not more than 0.1% of titanium and not more than 0.1% of zirconium.

Weldable steel excellent in the toughness of the bond in a single layer

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Chiba, Japan

Tomoo Tanaka