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HN56WMTJU steel grade is high-alloyed heat-resisting steel. It consists of nickel (52−64%), chrome (19−22%), iron (4%), carbon, phosphorus, sulphur, copper, aluminium, titanium, cerium, niobium. Alloying has to be done for increasing workable features (a heat-resistance, a resistance to aggressive environment). A superfluous alloying increases alloy cost. In this regard, this process is performed very economically. Steel must be workable; its operational factors must comply with a required level.
Percentage composition GOST 5632−72
Steel is smelted in open arc furnace. Semi-fabricate rolling is done at a temperature of 1170 °C at the beginning, and at 800 °C in the end of process. After deformation, steel should be cooled. According to a first pattern, there must be done a cooling in water, in oil, or in air. During a second pattern, cooling is done with a help of water with further holding of products (3 — 4.5 hours). Pipes can be manufactured of various lengths on the customer’s request. Welding of semi-fabricates is done with a help of electrodes KTI-762.
Pipes can durably work at a temperature higher than 600 °C. They are popular in industrial and civil engineering for water-supply systems because pipes do not give residual elements to water. Besides, there can be made connecting gangways and pipe fittings for tubes of stainless steel. Many people install fireplaces for making coziness and warmness in house. In such case, there are needed heat-resisting chimneys.
E 10— 5
a 10 6
Bar section is manufactured with a help of hot-rolling method and calibrating to confer an accurate outer diameter for goods. It is also used in manufacture of connecting pipes, flanges, heat-resisting stainless fittings.
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