HN35WT rod, wire, bar
Bar section of HN35WT grade is made of low-carbon constructional steel. It is a heat-resisting high-alloyed steel. Its composition constitute nickel (34−38%), iron (38−47%), chrome (14−16%). 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 in the capacity of masteralloys to charge mixture.
This steel serves for manufacture of devices and essential parts of building structure that work in aggressive conditions. In some cases, steel should be carburized (casehardened) with a purpose of increasing a hardness and wearing quality. A content of carbon of about 0,12% increases strength. At the beginning jumping-up temperature of semi-fabricates is 1170 °C; in the end temperature is 850 °C. Finished bar sections in the form of wire, rod or bar are cooled in air.
This alloy is easy weldable. It is necessary to do a previous heating to 200−300°С with an annealing (finishing heat treatment) to increase reliability of seams. Fastening of construction units is performed with a help of hand arc-welding method and electrodes KTI-762. Final annealing is recommended for releasing of stresses.
Wire, bar have the widest application: in details of high-temperature equipment that are exploited in mechanical engineering and petrochemical industry; in manufacture of disks, flat springs, fasteners that can work at temperature of <650 °C. If a temperature is higher than 850°C, there appears an active oxide scale formation. Rod is mainly used in metallurgic, chemical, textile industries. Wire is used in the capacity of electrode while welding a steel. Furnace conveyor grids are made of the thinnest wire.
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