03H20YU3NTB brand alloy produced according to TU 14−1-4645−89.Ispolzuyut to create a lightly loaded parts of the boiler equipment (torches, nozzles and screens), working temperature of 1100−1150 degrees Celsius. This steel is an analogue of the brand 15X25T, having improved heat resistance and weldability.
The mechanical properties of the alloy at t ° 20 ° C
|TU||Type of product||Rm N / mm²||σ0,2, N / mm²||δ5,%|
|TU 14−4645−89||Hot-rolled sheet||550||450||16|
At high temperatures 03H20YU3NTB alloy has the following mechanical properties (steel sheet 4.12 mm, temper 850 degrees in water)
|tisp, ° C||Rm N / mm²||σ0,2, N / mm²||δ5,%||ψ,%|
Indicators of heat resistance under conditions of still air
|tisp, ° C||At a temperature of 1200 ° C test|
|increasing weight, g / m2||νok g / (m ² · h)||νok mm / year|
|Explanation. νok — time corrosion.|
Hot working is carried out in a temperature range from 1000 to 800 ° C. Tempering is carried out at t ° 850 ° C with cooling in water and a half-hour delay. Steel welded at a satisfactory level.
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