Alloy KhN70Yu
Alloy KhN70Yu
Alloy KhN70Yu: Handbook of steels and alloys. Below is systematized information on the purpose, chemical composition, types of supply, substitutes, critical point temperature, physical, mechanical, technological and foundry properties for the grade — Alloy KhN70Yu.
General information on CrN70Yu alloy
| Delivery type |
| Bar stock, including shaped GOST 12766.4−77. Sheet GOST 24982−81. Wire GOST 12766.1−77. |
| Application |
| Various parts operating at moderate stresses, at 1100−1200 ° C (can be used for resistance heating elements). |
Chemical composition of the alloy KhN70U
| Chemical element |
% |
| Aluminum (Al) |
2.8−3.5 |
| Barium (Ba), not more |
0.10 |
| Iron (Fe), max. |
1.0 |
| Silicon (Si), max. |
0.8 |
| Manganese (Mn), not more than |
0.3 |
| Copper (Cu), not more than |
0.07 |
| Sulfur (S), not more than |
0.012 |
| Carbon ©, not more than |
0.10 |
| Phosphorus (P), not more than |
0.015 |
| Chrome (Cr) |
26.0−29.0 |
| Cerium (Ce), not more than |
0.03 |
Mechanical properties of CrN70Yu alloy
Mechanical properties depending on test temperature
| Section, mm |
t test,°C |
σ0, 2, MPa |
σB, MPa |
δ5, % |
δ4, % |
| Sheet. Tempering 1100−1150°C, water, water shower or air. |
| <3,9 |
20 |
|
<980 |
30 |
|
| <3,9 |
900 |
|
100 |
25 |
|
| Tempering 1100 °C, air. |
| |
20 |
480 |
880 |
|
35 |
| |
200 |
490 |
880 |
|
37 |
| |
300 |
370 |
760 |
|
37 |
| |
500 |
360 |
730 |
|
35 |
| |
700 |
320 |
480 |
|
37 |
| |
900 |
170 |
225 |
|
38 |
| |
1000 |
|
145 |
|
50 |
| |
1100 |
|
88 |
|
61 |
Mechanical properties in the long term strength test
| Creep strength, MPa |
Creep rate, %/h |
t test,°C |
Ultimate long-term strength, MPa |
Test duration, h |
t test, h |
| 25 |
5/100 |
900 |
88−98 |
100 |
800 |
| |
|
|
34−39 |
100 |
900 |
| |
|
|
78 |
300 |
800 |
Technological properties of CrN70Yu alloy
| Forging temperature |
| Beginning 1200, end 1100. Cooling in the air. |
| Weldability |
| Limited weldability. Requires the selection of special modes, in the welded joint has high strength. |
Physical properties of the alloy CrN70U
| Test temperature,°C |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Modulus of normal elasticity, E, GPa |
191 |
182 |
173 |
166 |
156 |
147 |
137 |
118 |
94 |
|
| Alloy density, pn, kg/m3 |
7900 |
|
|
|
|
|
|
|
|
|
| Thermal conductivity coefficient W/(m — °C) |
12 |
13 |
14 |
16 |
17 |
19 |
21 |
23 |
25 |
|
