Composition of CrN70Yu grade

The main component of the alloy is nickel up to 71.2% of the total. Up to 29% (if the share of nickel in the alloy is less than 71%) is occupied by chromium. This grade has a high heat resistance not only due to chromium and nickel, but also due to the additives silicon and aluminum. These substances are capable of forming oxide films at high temperatures which give additional protection to the product and therefore can be used in various high-temperature applications. The silicon content in the alloy is no more than 0.8%, and the aluminum content is 2.8 to 3.5%. Also the alloy contains about equal amounts of carbon and barium - up to 0,1%, manganese - up to 0,3%, phosphorus - up to 0,015%, selenium - up to 0,03%, copper - 0,07%.

Percentage composition (GOST 5632-72)

Production

Alloy KhN70Yu is produced in the induction open-hearth furnaces or by electroslag remelting. The production is regulated by GOST 12 766.477 and 5632-72. The first of them establishes standards for bars of steel with high electrical resistance, the second regulates corrosion-resistant heat-resistant high-alloyed alloys. The manufacture of bars XN70U is subject to specifications TU 14-1-1497-75, and the manufacture of wire - GOST 12 766.1-77. Semifinished products of this steel are used in production of parts of combustion chambers, pockets, diffusers and afterburner screens designed for temporary increase in thrust in engines. Such parts can operate at t° 1100-1200°C and withstand quite a heavy load.

Machining

The metal is forged at t° 1150-900°C at the start and end of the process, respectively. The finished bar is air hardened at t° 1200°C. The wire is air-hardened at a lower temperature of 1000°C. As this type of steel is not readily weldable, it is recommended that it be heat-treated after welding to eliminate residual stresses.

Use

CrN70U wire, rounds, bars can be used as blanks for parts, industrial gas piping systems and water supply systems. They withstand moderate stresses at high temperature. Wire, rounds and rods are used for the production of heating elements and welding wire, indispensable for surfacing various parts and welding metal structures in power engineering, parts that will work in a radioactive environment. Fasteners made of this steel can withstand prolonged heat up to 800 °C. The alloy is unstable in sulfur-containing environments.

Supply

All the presented products of CrN70U 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

Evek GmbH has a wide range of chrome-iron-nickel alloys in stock. We deliver the products of standard, non-standard parameters according to the individual order. All products are certified. The certificate indicates the alloy grade, heat number, chemical composition, the results of additional tests. We offer a wide range of wholesale rolled products for large-scale production. We also offer good conditions for retail buyers. Execution of orders takes minimum time. Preferential discounts are offered to wholesale customers. See also:

CrN70U pipe