Steel for nuclear applications

Details Steel for nuclear applications Steel for nuclear applications

1977-11-02

1980-07-29

Steiner, Arthur J.

75125, 75128R, 75128P, 75128E, 75128V, 75128W, C22C 3842, C22C 3844, C22C 3846

Patent

active

042149509

ABSTRACT:
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.

REFERENCES:
patent: 3711340 (1973-01-01), Korchynsky et al.
patent: 3929472 (1975-12-01), Okada et al.
patent: 4072509 (1978-02-01), Zorev et al.
"Irradiation Effects on Reactor Structural Materials" QPR 11/11-1/31/70, Steele et al 2/15/70.
"The Effect of Residual Elements on the Response of Selected Pressure-Vessel Steels and Weldments to Irradiation at 850.degree. F." Potapovs et al. Nuc. App. vol. 6, 1/69, pp. 27-46.
"Demonstration of Improved Radiation Embrittlement Resistance of A533-B Steel Through Control of Selected Residual Elements," Hawthorne, 5/70.
"Trends in Charpy-V Shelf Energy Degradation and Field Strength Increase of Neutron-Embrittled Pressure Vessel Heads," Hawthorne, Nuc. Eng. & Des. 11(1970) 427-446.
70 Met 3m ASME, pp.2-8, Hawthorne, "Experimental Development of Radiation Resistant 85,000 psi Field Strength Reactor Vessel Low Alloy Steel Filler Metal (Pre-Irradiation Evaluation".

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