CrN67MVTU-in (circle, wire, tube, sheet, strip) (ep202-in)
The heat resistant alloy of this grade is a stable austenitic alloy that does not change structure after heat treatment and outdoor cooling. The base of the alloy is nickel, whose share is 60.48 - 68.8%, the second position is occupied by chromium - 17-20%, tungsten and molybdenum are in the third place (4-5%). In addition to the main components, the alloy contains titanium, manganese, carbon, sulfur, silicon, aluminum, phosphorus.
Relevance
Heat resistant alloys of this type are widely used in the production of various semi-finished products. The most popular of them are pipes, bars. They are used in the energy-machine building industry (parts of machines and equipment for power engineering), in rocket and space and aviation equipment.
The percentage composition of CrN67MVTU-bd (ep202-bd) GOST 5632 - 72
| Fe | C | Si | Mn | Ni | S | P | Cr | Ce | Mo | W | Ti | Al | B |
| ≤4 | ≤0.08 | ≤0.6 | ≤0.5 | 60.48 - 68.8 | ≤0.01 | ≤0.015 | 17 - 20 | ≤0.01 | 4 - 5 | 4 - 5 | 2.2 - 2.8 | 1 - 1.5 | ≤ 0.01 |
Mechanical properties t° 20°C
| Range | GOST | s in | sT | d5 | y | KCU | Heat treatment |
| - | MPa | MPa | % | % | kJ/m2 | - | |
| Sheet, |
24982-81 | 930 | 550 | 15-18 | Hardening and tempering | ||
| Wire |
23705-79 | 930 | 550 | 16 | 18 | 343 | Hardening and Aging |
Alloys that are designed to operate in high heat environments are generally divided into the following types. 1) heat-resistant steels - operate for a long time at temperatures up to 600 °C; 2) heat-resistant steels - are sufficiently resistant to operate at higher temperatures in a loaded condition, and3) scale-resistant (heat-resistant) - continuous service above 550°C in unloaded or slightly loaded condition, resistant to coating failure in gas and chemical environment. In this case, the load refers to several loading schemes: static torsional, bending or tensile, thermal load - depends on the temperature difference, dynamic alternating load with different frequency and amplitude, the dynamic impact of high-speed gas flows on the coating.
Use
Tubes, strip steel of this grade are used in installations operating under high gas pressure. They are in demand in gas and water drainage systems, in industrial construction for internal and external communications. This pipe is used in the food industry and mechanical engineering, it is actively used in the elements of aviation equipment - turbine parts. Circle and bar is used in construction, industry and at home. In general, these products can be considered universal. Bar has good ductility, weldability, can be high and standard strength (calibrated). It is used in industrial engineering, machine tool construction.
The supplier
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