A steel of grade HN35WTJU is a high-alloyed heat-resistant alloy on an iron-nickel basis. It is used in manufacture of floating details that work at temperatures of 850 °C. This alloy relates to a category of ferritic-austenic steels. In comparison with austenic steels, it has almost twice as large lasting-quality, higher resistance to intercrystalline corrosion, and increased resistance to corrosion cracking in alkaline and chloride environment. A usage of austenic and ferritic steels directly depends on conditions of exploitation.
An iron basis is alloyed with 34−38% of nickel, 14−16% of chrome. Titanium (1,1−1,5%), copper (<0.25%), phosphorus (<0.03%), mangan (<1-2%), wolframium (2,3-3,5%), molybdenum (<0,3%), sulfur (0,02%) should be added to charge mixture in the capacity of masteralloys.
Chemical composition of alloy
At the beginning malleating temperature of semi-fabricates is 1170 °C; in the end a temperature is 850 °C. Finished product is cooled in air. With respect to accuracy of manufacture, pipes can be manufactured of two types: extended accuracy or usual accuracy. There can be made following types of pipes: 1) electric welded, 2) seamless hot-rolled, 3) cold-rolled and warm-worked pipes of common use. They are used for building structures, pipeline constructions. Pipe made of HN35WTJU grade is hardly weldable. In order to obtain joints of high quality, it is necessary previously to heat them up to a temperature of 200−300°С. Then, to do a further heat treatment and annealing after finishing a welding. A hand arc-welding performs with a help of electrodes KTI-762. Final heat treatment is recommended for releasing of stresses while welding. Electric welded tubes can be manufactured in following forms: shaped pipes of a square section, circular longitudinal welded tube of oval or rectangular sections. A manufacture of pipes is specified by GOST 30 245−2003, 10 706−76, 10 705−80, 380−94, 13 663−86, 1050−88, 8639−82, 8642−68, 8645−68. Each of the standards stipulates individual characteristics of product.
Steel of HN35WTJU grade has a limit in welding. Welding is performed after a heating to 200 °C with a further heat treatment.
|limitedly weldable||welding is possible at heating to 100−120°С and last heat treating|
|hardly weldeable||in order to obtain a qualitative welded joints, it is necessary to perform the following operations: while welding to heat it up to 200−300°C, to do a heat treatment (annealing) after welding|
|welding is done without further heat treating or previous heating|
Heat resistant pipe HN35WTJU is widely used in modern manufacture. Alloy properties guarantee long term operation of goods. They can withstand load at a temperature of <850°C. When a temperature is higher than 850°C, on pipe's surface appears an oxide scale formation. Such a tube is used without limits in any sphere: building, metallurgy, mechanical engineering, industrial chemistry, paper-and-pulp industry. It is also used for supply of gas or liquid.
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