19 Strands Resistohm 80 Resistance Stranded Cable Heating Wire Nickel Chrome Alloy
19 Strands Resistohm 80 Resistance Stranded Cable Heating Wire
1. General Descrption
Nichrome (NiCr, nickel-chrome, chrome-nickel, etc.) is any of various alloys of nickel, chromium, and often iron (and possibly other elements). The most common usage is as resistance wire, although they are also used in some dental restoration (fillings) and in a few other applications.
Nichrome wire can be used as an alternative to platinum wire for flame testing by colouring the non-luminous part of a flame to detect cations such as sodium, potassium, copper, calcium, etc.
The alloy price is controlled by the more expensive nickel content. Distributor pricing is typically indexed to market price for nickel.Nichrome wire is commonly used in ceramic as an internal support structure to help some elements of clay sculptures hold their shape while they are still soft. Nichrome wire is used for its ability to withstand the high temperatures that occur when clay work is fired in a klin.
The more individual wire strands in a wire bundle, the more flexible, kink-resistant, break-resistant, and stronger the wire becomes. However, more strands increases manufacturing complexity and cost.
Other areas of usage include motorcycle muffles, in certain areas in the microbiological lab apparatus, as the heating element of plastic extruders by the RepRap 3D printing community, in the solar panel deployment mechanism of spacecraft Lightsail-A, and as the heating coils of electrical cigarretes.
Stranded Wire
For geometrical reasons, the lowest number of strands usually seen is 7: one in the middle, with 6 surrounding it in close contact. The next level up is 19, which is another layer of 12 strands on top of the 7. After that the number varies, but 37 and 49 are common, then in the 70 to 100 range (the number is no longer exact). Even larger numbers than that are typically found only in very large cables.
For application where the wire moves, 19 is the lowest that should be used (7 should only be used in applications where the wire is placed and then does not move), and 49 is much better. For applications with constant repeated movement, such as assembly robots and headphone wires, 70 to 100 is mandatory.
For applications that need even more flexibility, even more strands are used (welding cables are the usual example, but also any application that needs to move wire in tight areas). One example is a 2/0 wire made from 5,292 strands of #36 gauge wire. The strands are organized by first creating a bundle of 7 strands. Then 7 of these bundles are put together into super bundles. Finally 108 super bundles are used to make the final cable. Each group of wires is wound in a helix so that when the wire is flexed, the part of a bundle that is stretched moves around the helix to a part that is compressed to allow the wire to have less stress.
Other areas of usage include motorcycle muffles, in certain areas in the microbiological lab apparatus, as the heating element of plastic extruders by the RepRap 3D printing community, in the solar panel deployment mechanism of spacecraft Lightsail-A, and as the heating coils of electrical cigarretes.
| Wire Gauge (B&S No. / AWG) |
Outside Diameter of Helix (inches)[3] | |||||||||||
| 3⁄4 | 5⁄8 | 1⁄2 | 3⁄8 | 1⁄4 | 7⁄32 | 3⁄16 | 5⁄32 | 1⁄8 | 3⁄32 | 1⁄16 | 1⁄32 | |
| 14 | 0.446 | 0.365 | 0.283 | 0.202 | 0.121 | 0.101 | ||||||
| 15 | 0.638 | 0.523 | 0.408 | 0.293 | 0.178 | 0.148 | 0.120 | |||||
| 16 | 0.895 | 0.735 | 0.575 | 0.415 | 0.255 | 0.215 | 0.175 | 0.135 | ||||
| 17 | 1.32 | 1.08 | 0.851 | 0.617 | 0.383 | 0.325 | 0.266 | 0.208 | 0.150 | |||
| 18 | 1.89 | 1.56 | 1.22 | 0.891 | 0.559 | 0.475 | 0.392 | 0.309 | 0.226 | |||
| 19 | 2.60 | 2.14 | 1.69 | 1.23 | 0.779 | 0.665 | 0.551 | 0.438 | 0.324 | |||
| 20 | 3.72 | 3.07 | 2.42 | 1.78 | 1.13 | 0.967 | 0.805 | 0.644 | 0.482 | |||
| 21 | 4.53 | 3.58 | 2.63 | 1.68 | 1.45 | 1.21 | 0.971 | 0.733 | 0.496 | |||
| 22 | 4.98 | 3.67 | 2.36 | 2.03 | 1.70 | 1.37 | 1.05 | .719 | ||||
| 23 | 7.02 | 5.18 | 3.34 | 2.88 | 2.42 | 1.96 | 1.51 | 1.05 | ||||
| 23 | 7.02 | 5.18 | 3.34 | 2.88 | 2.42 | 1.96 | 1.51 | 1.05 | ||||
| 24 | 4.69 | 4.05 | 3.41 | 2.78 | 2.14 | 1.60 | 0.865 | |||||
| 25 | 6.87 | 5.94 | 5.02 | 4.10 | 3.17 | 2.25 | 1.32 | |||||
| Alloy Nomenclature Performance | Cr20Ni80 | Cr30Ni70 | Cr15Ni60 | Cr20Ni35 | Cr20Ni30 | |
| Main Chemical composition | Ni | Rest | Rest | 55.0-61.0 | 34.0-37.0 | 30.0-34.0 |
| Cr | 20.0-23.0 | 28.0-31.0 | 15.0-18.0 | 18.0-21.0 | 18.0-21.0 | |
| Fe | ≤1.0 | ≤1.0 | Rest | Rest | Rest | |
| Max. continuous service temp. of element(ºC) | 1200 | 1250 | 1150 | 1100 | 1100 | |
| Resistivity at 20ºC (μΩ·m) | 1.09 | 1.18 | 1.12 | 1.0 | 1.04 | |
| Density(g/cm3) | 8.40 | 8.10 | 8.20 | 7.90 | 7.90 | |
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