General characteristics

Steel tubes KhN73MBTU-vd (EI698-vd) are made of heat-resistant nickel-based alloy. The composition contains 65.073 — 71.2%. Ni, 26−29% Cr — refers to chromium-nickel. Alloyed alloys. During the melting of the initial charge is added to a variety of substances — metals and nonmetals affecting the quality of the final product. As an additive is used aluminum — 2.8−3.5%, iron — 1%, barium — no more than 0.1%, silicon — up to 0.8%, manganese 0.3%, cerium about 0.03%, phosphorus less than 0.015%, copper about 0.07% and sulfur about 0.012%. Smelted in an induction open furnace or use the method of electroslag remelting — a method of producing metal by remelting in a bath of electrically conductive slag under the influence of an electric current. This remelting method greatly increases the quality of the metal. Steel is forged at temperatures between 1150 °C at the start and 900 °C at the end of the process. After forging preferably hardening in water or air at t ° 1100−1200 ° C.

Percentage composition (GOST 5632−72)

Application

Fragments of gas piping systems operating under normal loads. Pipes can be used for a long time at temperatures around 800 ° C, can withstand short-term heating to t ° 1200 ° C, above which the active formation of scale. The alloy is heat-resistant and creep-resistant, but is unstable in environments containing sulphur.

Bar and round can be used as blanks for the production of shaped products, beams, angles, channels or profiles for specialized purposes, which are used in construction works of any level of complexity. The circle is used as a billet for producing axles, pushers, shafts and other moving parts of machinery. Weldability is limited, requires preheating to 200 °C and a final heat treatment. The alloy is used in production of heating elements, welding wire for welding of metal structures, cladding of parts in mechanical engineering. This alloy is used for parts of the afterburner — an additional combustion chamber for turbojet engines that is required for a temporary increase in thrust, as well as combustion chambers operating at the lowest load at t° 1100−1120°C.

.In addition to the gas piping system, pipes ХН73МБТЮ- vd can be used to drain water, steam, red-hot industrial gases and smoke. When heated, aluminum and chromium in the composition of the alloy form an oxide film, which increases the degree of material resistance to corrosive environments.

Delivery

All the presented products of ХН73МБТЮ-Вd grade are certified. The technical documentation includes data on the chemical composition, the limiting percentage of impurities; mechanical properties of products. From us you can buy in bulk any semi-finished products for large-scale production. We also offer optimum conditions for retail buyers. The high level of service and responsiveness of service is the face of our company.

Buy at the best price

All chromium-nickel alloys sold by Evek GmbH comply with state quality standards. We supply rolled metal products of standard and non-standard sizes in the shortest terms. High quality, reasonable prices and a wide range of products determine the face of our company. Becoming our regular customer, you can count on a system of discount discounts. Cooperation with us will help you realize any engineering plans. We are waiting for your orders on our site.