HN50WTJUBK tube, rod made of alloy 47NHP
Nickel-chromium alloy of HN50WTJUBK grade relates to a high-alloyed heat-resisting mill-products. It is used in manufacture of connectors, heavy loaded details, flanges, details for aerotechnics (disks, gas turbine blades, etc.), flat product detals for limited operating life at a temperature of <+950°С.
Alloying produces multidimensional effect on a steels quality. Chrome increases hardness and resistant to corrosion. Nickel confers plasticity; wolframium confers hardness, red-hardness. Vanadium increases strength, resistance to impact loads and wipe out; cobalt raises heat-resistance, magnetic permeability. Molybdenum confers red-hardness, strength, resistance to corrosion at a high temperature. When a quantity of mangan is more than 1%, it increases impact index and wearing qualities. Titanium increases stability, corrosive resistance; aluminium raises resistance to oxide scale formation; niobium increases resistance in acid environment. Cuprum raises plasticity, prevents an action of rust. Extra-qualitative steel contains borium, zirconium, selenium, nitrogen except for above-said components.
|Jointing parts, steel pipes||B62 (V62)||According to TC 14−3-837−79, 14−8-37−2001|
|Alloy strips, sheets||B33 (V33)||According to TC 14−1-1052−74, 14−1-1072−74|
|Alloy strips||B54 (V54)||According to TC 14−1-1423−75|
|Long shape steel-rolled stock||B32 (V32)||According to TC 14−1-3046−80, 14−1-3046−97; GOST 22 411−77|
|Bars Plate slabs. Pigs.||B31 (V31)||According to GOST 1 90 424−92, 1 90 303−81, TC 14−1-1213−75, 1−809−823−99, 14−1-4103−86|
Forging temperature: 1170°C- at the beginning, 850°C- in the end. Cooling is done in air.
It is used in the capacity of heat-resisting steel.
Metal-cutting is done at НВ 269, σV=951 MPa in a heat treated condition.
An intensive oxide scale formation begins at a temperature of 850−955°C.
Operational period is long-sustained.
Recommended operating temperature is 650 °C.
Welding of actual steel is hard. Type of welding: hand arc-welding with a help of electrodes KTI-762. Further heat treatment is recommended for releasing of welding stresses.
Technical conditions, GOST
Qualitative steel surface, with a special finishing GOST 14 955−77.
Round, long, hot-rolled steel mill-products GOST 2590−2006.
Square, long, hot-rolled steel mill-products GOST 2591−2006.
Shaped steel sections of high accuracy 14−11−245−88.
Type Round, square hammered steel GOST 1133−71.
Hammered, hot-rolled strips made of tool steel. GOST 4405−75.
Calibrated round steel GOST 7417−75.
Calibrated square steel GOST 8559−75.
Flat, long, hot-rolled steel mill-products GOST 103−2006.
Calibrated, corrosive-resistant, heat-resisting steel GOST 5949−75.
Hexagonal calibrated mill-products GOST 8560−78.
Hammered, square, round steel GOST 1133−71.
Heat-resisting, high-alloyed, corrosive-resistant steels OST 5632−72.
Hot-rolled, long, hexagonal, steel mill-products GOST 2879−2006.
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