Alloy CR20NI80-H
Designation
| Name |
The value |
| Designation GOST Cyrillic |
Х20Н80-Н |
| Designation GOST Latin |
X20H80-H |
| Transliteration |
H20N80-N |
| The chemical elements |
Cr20Ni80-Ni |
Description
Alloy CR20NI80-H is used: for the manufacture of electric heating elements in industrial furnaces and various electric heating devices with maximum operating temperatures up to +1200 °C, and appliances; rolled strip 0.1−1.0 mm for the manufacture of heating elements and resistance elements.
Note
The heat resisting alloy in an oxidizing atmosphere, in nitrogen, ammonia, unstable in the atmosphere containing sulfur and sulfur compounds, more heat resistant than zhelezomargantsevye alloys.
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and general norms |
В30 |
GOST 10994-74 |
| Steel alloy wire |
В73 |
GOST 12766.1-90, OST 88.0.022.202-74, TU 14-173-142-88 |
| Tapes |
В34 |
GOST 12766.2-90, GOST 12766.5-90, GOST 12766-67 |
| Sectional and shaped rolling |
В32 |
GOST 12766.3-90, GOST 12766.4-90, TU 14-11-245-88 |
| Bulls. Blanks. Slabs |
В31 |
TU 14-1-3904-84 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Al |
Ti |
Zr |
| GOST 10994-74 |
≤0.06 |
≤0.015 |
≤0.02 |
≤0.6 |
20-23 |
1-1.5 |
The rest |
≤1 |
≤0.2 |
≤0.2 |
0.2-0.5 |
| GOST 12766-67 |
≤0.1 |
≤0.02 |
≤0.03 |
≤0.6 |
20-23 |
1-1.5 |
The rest |
≤1.2 |
≤0.2 |
≤0.2 |
≤0.5 |
Ni is the basis.
In accordance with the requirements of GOST 10994-74, the alloy must be smelted in induction furnaces.
According to GOST 12766-67 the chemical composition is given for the alloy grade Kh20N80-N. The presence in the alloy of residual rare-earth elements, as well as barium and calcium, is not a defective feature.
Mechanical characteristics
| Section, mm |
σB, MPa |
d5, % |
d |
y, % |
Brinell hardness number, MPa |
| Wire cold-drawn heat-treated in the delivery condition according to GOST 12766.1-90 (the value is δ200) |
|
≤880 |
- |
≥20 |
- |
- |
| Wire cross section of 0.1-7.5 mm. heated to 1200 °C (exposure: 20 min), air cooling |
| - |
≥656 |
≥45 |
- |
≥61 |
- |
| Wire. Heating up to 1200 °C (exposure: 20 min), air cooling |
| 0.1-7.5 |
≥656 |
≥45 |
- |
≥61 |
140-150 |
| Wire cross section of 0.1-7.5 mm. heated to 1200 °C (exposure: 20 min), air cooling |
| - |
≥431 |
≥40 |
- |
≥40 |
- |
| - |
≥215 |
≥70 |
- |
≥72 |
- |
| - |
≥92 |
≥55 |
- |
≥82 |
- |
| - |
≥71 |
≥70 |
- |
≥62 |
- |
| - |
≥35 |
≥130 |
- |
≥93 |
- |
| - |
≥27 |
≥110 |
- |
≥96 |
- |
| - |
≥22 |
≥102 |
- |
≥98 |
- |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| d |
Elongation after rupture |
| y |
The relative narrowing |
Physical characteristics
| Temperature |
Е, ГПа |
r, кг/м3 |
l, Вт/(м · °С) |
R, НОм · м |
a, 10-6 1/°С |
С, Дж/(кг · °С) |
| 20 |
217 |
8400 |
- |
1175 |
- |
440 |
| 100 |
- |
- |
14 |
1180 |
- |
- |
| 200 |
- |
- |
16 |
1190 |
- |
- |
| 300 |
- |
- |
17 |
1200 |
- |
- |
| 400 |
- |
- |
19 |
1215 |
- |
- |
| 600 |
- |
- |
23 |
1200 |
- |
- |
| 500 |
- |
- |
- |
1220 |
- |
- |
| 700 |
- |
- |
- |
1195 |
- |
- |
| 800 |
- |
- |
- |
1195 |
- |
- |
| 900 |
- |
- |
- |
1200 |
- |
- |
| 1000 |
- |
- |
- |
- |
163 |
- |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
| С |
Specific heat |
Technological properties
| Name |
The value |
| Weldability |
RDS. Gas welding does not apply. |
| Microstructure |
Austenitic structure. |
| Magnetic properties |
Non-magnetic alloy. |
| Окалиностойкость, heat resistance |
Onlinetony alloy in an oxidizing atmosphere, hydrogen, vacuum; unstable in an atmosphere containing sulfur and sulfur compounds; more heat resistant than homoalanine alloys. |
| Operating temperature |
The working temperature of heating element: Optimal 1150 °C, the limit of 1200 °C. maximum recommended operating temperature of the heating element from 950 °C at a thickness of 0.2 mm to 1200 °C thickness ≥ 6.0 mm. |
| Vitality |
Survivability at a temperature of 1150 °C for at least 160 hours. |
