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Lev Y Gluskin

Igor V Gorynin

Jury F Balandin

Jury I Zvezdin

Valery Pavlov

Viktor A Ignatov

Vasily V Ardentov

Vladimir G Azbukin

Alexandr G Ignatenko

Alexandr N Krasnov

Alexandr A Khokhlov

Rostislav K Melekhov

Ivan A Stepanov

Alexandr F Anfimov

Inna S Osipova

Viktor M Burmakin

Eduard A Rokhlin

Vladimir V Zhitkov

Nikolai N Zorev

Vladimir A Nikolaev

Anatoly A Astafiev

Jury V Sobolev

Vladimir S Dub

Vladimir I Badanin

Anatoly M Parshin

Oleg M Vishkarev

Sergei I Markov

Valentin I Kozlov

A corrosion-resistant weldable martensitic steel essentially consists of carbon 0.06 to 0.10 weight percent, chromium 15.1 to 16.5 weight percent, nickel 3.5 to 4.45 weight percent, silicon 0.10 to 0.60 weight percent, manganese 0.20 to 0.50 weight percent, at least one element selected from the group consisting of niobium 0.25 to 0.40 weight percent and zirconium 0.05 to 0.20 weight percent, at least one element selected from the group consisting of yttrium 0.05 to 0.20 weight percent, cerium 0.05 to 0.15 weight percent and lanthanum 0.05 to 0.15 weight percent, phosphorus not exceeding 0.025 weight percent, sulfur not exceeding 0.02 weight percent, copper not exceeding 0.20 weight percent, the remainder being substantially iron and unavoidable nonferrous impurities. The process for the manufacture of the steel comprises the steps of preparing a molten mass of said composition, pouring the molten mass into a mould and permitting it to solidify therein followed by cooling an ingot produced. The cooling step is carried out in at least two stages, the first stage residing in cooling the ingot to a temperature laying in martensite transformation start-end interval but not lower than to 100.degree. C., and then in its immediate heating up to tempering temperatures in the range from 600.degree. to 650.degree. C., whereas each subsequent stage comprises cooling the ingot to martensite transformation temperatures but by at least 50.degree. C. lower than the cooling temperature of the previous stage, thus bringing, with such a multistage cooling, the temperature of the ingot down to a value below the temperature of the end of martensite transformation, followed by final tempering in the temperature range of 600.degree. to 650.degree. C. and subsequent cooling to room temperature.

Corrosion-resistant weldable martensitic stainless steel, process for

The steel according to the invention consists of 0.12-0.20% by weight of carbon, 0.15-0.37% by weight of silicon, 0.3-0.8% by weight of manganese, 1.6-2.7% by weight of chromium, 0.8-2.0% by weight of nickel, 0.5-1.0% by weight of molybdenum, 0.05-0.15% by weight of vanadium, 0.002-0.08% by weight of cerium, 0.01-0.10% by weight of copper, 0.0005-0.009% by weight of antimony, 0.0005-0.009% by weight of tin, 0.001-0.02% by weight of sulphur, 0.002-0.02% by weight of phosphorus, 96.246-92.862% by weight of iron. The steel exhibits improved resistance against neutron radiation. At 300.degree. C. and neutron fluence of 1.10.sup.20 neutr./cm.sup.2, the transition embrittlement temperature increases by no more than 50.degree. C. The steel is designed for application in structural members having a wall thickness of up to 650 mm and has ultimate strength .sigma..sub.B at 350.degree. C. of at least 55 kgf/mm.sup.2. The steel does not require immediate temper after welding.

Steel for nuclear applications

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Saint-Petersburg, Russia

Lev Y Gluskin