Nickel alloys
General characteristics
The main quality nichrome directly related to its chemical composition. Moreover, the importance is not only the presence of a particular element in the alloy composition, but also its percentage of the other components. Therefore, the correct selection of material for certain purposes it is necessary to know the most important qualities of all types of nichrome.
Percentage composition
| Alloy | C | Al | Fe | Ni | Cr | Mn | P | Ti | Si | S |
|---|---|---|---|---|---|---|---|---|---|---|
| CR20NI80 | ≤0,1 | ≤0,2 | ≤1,5 | 72,7−79,1 | 20−23 | ≤0,7 | ≤0,03 | ≤0.3 mm | 0,9−1,5 | ≤0,02 |
Percentage composition
| Alloy | C | Al | Fe | Ni | Cr | Mn | P | Ti | Si | S |
|---|---|---|---|---|---|---|---|---|---|---|
| H15N60 | ≤0,15 | ≤0,2 | The 17.3−29,2 | 55−61 | 15−18 | ≤1,5 | ≤0,03 | ≤0.3 mm | 0,8−1,5 | ≤0,02 |
Particularly significant parameters that determine the industrial value of some grades of this material are presented in the table.
| Feature | Brand nichrome | ||||
| Х20Н30 | Х20Н35 | H15N60-H | CR20NI80-H | ||
| Chemical composition | Nickel | 30−34 | 34−37 | 55−61 | The rest |
| Chrome | 18−21 | 18−21 | 15−18 | 20−23 | |
| Iron | The rest | The rest | The rest | Less than 1 | |
| Carbon | less than 0.06 | less than 0.06 | less than 0.06 | less than 0.06 | |
| Silicon | 1−1,5 | 1−1,5 | 1−1,5 | 1−1,5 | |
| Manganese | less than 0.06 | less than 0.06 | less than 0.06 | less than 0.06 | |
| Sulfur | less than 0.015 | less than 0.015 | less than 0.015 | less than 0.015 | |
| Phosphorus | At least 0,020 | At least 0,020 | At least 0,020 | At least 0,020 | |
| Titan | Less than 0.2 | Less than 0.2 | Less than 0.2 | Less than 0.2 | |
| The maximum temperature for continuous operation | ◦C | 1100 | 1100 | 1150 | 1200 |
| The electrical resistance (specific) | Омхмм2/m | Of 1.04 | 1 | 1,12 | Of 1.09 |
| The density of the material | g/cm3 | 7,9 | 7,9 | 8,2 | 8,4 |
| The thermal conductivity | W/ (m*K) | 43,8 | 43,8 | 45,2 | 60,3 |
| The coefficient of linear expansion | 10 to the minus sixth power / ◦C | 19 | 19 | 17 | 18 |
| The value of the melting temperature | ◦C | 1390 | 1390 | 1390 | 1400 |
| The maximum elongation at break | (%) | Less than 20 | Less than 20 | Less than 20 | Less than 20 |
| The type of material | austenite | austenite | austenite | austenite | |
| Magnetic properties | Mild | Mild | No | No | |
Data specifications will help to choose the appropriate alloy for each specific objective, depending on the conditions of operation of the unit, as well as the availability in the work area for additional hazards. After all, a rational selection of raw materials and cost-effective selection of raw materials for the manufacture of products, is one of the main guarantees of success of any industrial project.
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