All-Russian Scientific Research Institute of Aviation Materials “VIAM”, Moscow, Russia

V. V. Antipov, Deputy Chief Executive Officer, e-mail: antipovvv@viam.ru
E. A. Tkachenko, Head of Department

“Stupino Metallurgical Company” JSC, Stupino, Moscow Oblast, Russia

V. M. Chertovikov, Chief Executive Officer

V. P. Gorokhov, Head of Bureau

There is developed and introduced a process of manufacturing of large-size lagging sheets from 1163 alloy (1163 RDTV (РДТВ) and 1163 RDMV (РДМВ) grades) with regulated solid cladding made of AD35P (АД35П) alloy. Mechanical properties and fatigue characteristics of this alloy are increased, in comparison with commercially available sheets of 1163 ATV (АТВ) grade, which crack resistance (K_с^app) is equal to the Al cladding sheets of 2524 T351 grade. This is confirmed by complex broad investigations and tests. The 6.5 mm thick plates made of AD35P and AD1pl (АД1пл) alloys with low content of titanium, iron and silicon, were used for obtaining of cladding (solid regulated with technological). Investigated sheets of 1163 RDTV grade have high technological plasticity indices both in the annealed state and in hardened conditions. These indices are identical to similar characteristics of serial-produced sheets. Corrosion properties of the 1163 RDTV alloy sheets are identical to the parameters of serial sheets of 1163 ATV and 1163 RDTV grades. Special normative documentation was developed and issued according to the results of carried out researches and tests. This documentation is necessary for serial production of large-sized lagging sheets of 1163 RDTV and 1163 RDMV grades with improved service characteristics (thickness of 1.0–4.0 mm, width of less than 2200 mm and length of less than 9500 mm (according to the Technical Conditions TU 1-801-006–2011)) and mechanical properties (σ_В (UTS)  425 MPa, σ_0,2 (YTS)  275 MPa,  (El)  15% (for the sheets with thickness of 1.5–4.0 mm) and σ_В (UTS)  405 MPa, σ_0,2 (YTS)  270 MPa,  (El)  15% (for the sheets with thickness of 1.0–1.4 mm)). There is also issued the technological instruction for manufacturing of sheets (including large-sized sheets) from 1163 alloy with solid regulated cladding, in production conditions of Stupino Metallurgical Company.

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