Pipe HN35WT (EI612)
Actual alloy relates to high-alloyed heat-resisting alloys on iron-nickel basis. It is used in a manufacture of floating details that work at temperatures of 900−1000°С. This steel is limitedly weldable. Welding performs after a heating to 200 °C with further heat treatment.
Chemical composition of alloy
Jumping-up temperature of semi-fabricates is 1170 °C at the beginning; in the end a temperature is 850 °C. Finished product cools in air. With respect to accuracy of manufacture, pipes can be manufactured of two types: extended accuracy or usual accuracy. There can be manufactured such types of pipes as: seamless hot-rolled pipe, cold-rolled and warm-worked commercial pipe, electric welded pipe.
Physical properties depending on a temperature
E 10— 5
a 10 6
Pipe made of HN35WT 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, and to do an annealing after finishing a welding. Fastening of elements and pipes is performed with a help of hand arc-welding method and electrodes KTI-762. Further 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, square or rectangular roll-formed welded closed sections. Manufacture of tubes is specified by following 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.
HN35WT pipe is used in building industry, petrochemical mechanical engineering, paper-and-pulp industry. Their qualities guarantee a manufacture of products that have a long term operation. 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 pipes are widely used in building industries. It is also used in installation of heat-exchange systems.
HN35WT pipe supplies of various thread types: cut thread, straight rolled thread or without thread at all. There must be made an allowance (5 mm) for every cut. Pitch deflection must not exceed 10 mm toward a full-length. Pipe grade and size comply with GOST 3262−75. Pipe supplies with a length of 4 — 12 meters.
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