SU665018A1 - Steel - Google Patents

Description

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Testing of mechanical properties and corrosion fatigue strength is carried out in accordance with the requirements of GOST 1497-73, 9454-60, 9455-60, GOST 4860-65.

The table lists the chemical composition and the minimum level of mechanical properties of the thermally treated metal 3 industrial heats of the proposed and known steels. The results show that the strength properties of the two steels listed in the table are almost identical, however, the proposed steel has a significantly greater viscosity margin, less sensitivity to notch and, accordingly, a tendency to brittle fracture, compared to the known steel. The transition temperature from viscous to brittle to the proposed steel with dynamic bending (HK) -80 ° C and with static bending (7 cds) -50 ° C, while for known steel these characteristics are -40 ° C and - 10 ° C.

Increased viscosity and lower sensitivity to the notch of the proposed steel provides a higher value of its conditional limit of corrosion and fatigue strength. This characteristic of the proposed steel is 12 kgf / mm when tested in sea water on the basis of 50 cycles of specimens with a diameter of 10 mm with a notch depth of 2.5 mm, an opening angle of 45 and a radius at the notch tip of 0.1 mm, and the known steel is not more than 7-10 kgf / mm when testing samples under similar conditions.

The conventional corrosion fatigue strength limit is one of the main characteristics of the material, ensuring their reliable performance of products, and therefore parts of the proposed steel will have increased durability and operational reliability.

Claims (1)

Invention Formula Steel, carbon, and silicon, manganese, chromium, nickel, copper, molybdenum, and iron are different in that, in order to provide high strength, ductility, toughness, and corrosion fatigue, as well as reducing notch sensitivity and tendency to brittle fracture, it additionally contains calcium and yttrium in the following ratio of components, weight. %: Carbon 0.05-0.10 Silicon 0.01-0.4 Manganese 1.0-1.5 Chrome 14.0-16.0 Nickel 3.5-3.9 Copper 1.0-1.5 Molybdenum 0.3-0.45 Calcium 0.01-0.1 Yttrium 0.01-0.1 Elsego Else 5 Sources of information taken into account during the examination 665018 b 1. Patent of England No. 1294336, cl. C 7A, 1972.