How to distinguish chromel from alumel in color
Are you interested in how to distinguish between chromel and alumel in color? Supplier Avlob offers to buy thermocouple wire at a bargain price. The supplier guarantees the timely delivery of products to any specified address. Regular customers can take advantage of discount discounts. The price is the best in this segment.
Technical specifications
The electrical resistivity of the alumel alloy is 0.32 Ohmmmm 2 / m, the melting point is 1440 ° C, the coefficient of linear thermal expansion is 13.7 • 10 -6 / ° C, the density is 8.48 g / cm³,
Aljumel. Percent composition
| Fe | Co | Mn | Ni + Co | C | Mn | Al | Si | Impurities |
|---|---|---|---|---|---|---|---|---|
| ≤0.3 | 0.6 — 1.2 | 1.8 — 2.7 | 91.5 — 95.15 | ≤0.1 | 1.8 — 2.7 | 1.6 — 2.4 | 0.85 — 1.5 |
≤0.7 |
The surface of the alumel wire is more matte, greyish, less shiny than the surface of the chromel.
Chromel
Nickel improves ductility, ductility and corrosion resistance. The surface acquires a stable greenish film of nickel oxide. This alloy is slightly heavier than alumel, has a successful combination of thermoelectric properties and heat resistance. Its density is 8.71 g / cm³, and the melting point is 1400−1500 ° C.
Percentage of chromel
| Ni + Co | Fe | C | Co | Si | Mn | Si | Al | Impurities |
|---|---|---|---|---|---|---|---|---|
| 87.4 — 90.4 | ≤ 0.3 | ≤ 0.2 | 9 — 10 | ≤ 0.4 | ≤ 0.3 | ≤ 0.4 | 0.6 — 1.2 |
≤1,4 |
Storage
In closed warehouses or under a canopy, where adequate protection against mechanical and other damages is provided.
Delivery, price
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