nickelchromlegeringar

Nickelchromlegeringar, also known as nickel‑chromium alloys, are metal alloys composed primarily of nickel (Ni) and chromium (Cr) with varying amounts of other elements such as iron, cobalt, manganese, and silicon. The proportion of nickel to chromium determines the alloy’s characteristics, with common ratios ranging from 70% Ni–30% Cr to 80% Ni–20% Cr.

These alloys exhibit high resistance to oxidation, corrosion, and thermal degradation, making them suitable for high‑temperature applications. They retain mechanical strength and ductility even at temperatures above 500 °C, which is why they are frequently used in heating elements, furnace parts, and electrical resistance wires. In addition to their thermal stability, nickelchromlegeringar display good electrical resistance and a predictable temperature coefficient, rendering them useful for thermocouples and temperature sensors.

The inclusion of chromium increases the alloy’s oxidation resistance by forming a thin, protective chromium oxide layer on the surface. Adding other elements such as silicon or aluminium can further improve oxidation resistance or adjust electrical resistivity. For example, adding 4–6 % silicon can produce a stainless variant known for exceptional resistance to acid corrosion.

Nickelchromlegeringar were first developed in the late 19th and early 20th centuries in response to industrial demands for materials that could withstand high temperatures and corrosive environments. Their adoption expanded rapidly during the development of electrical heating and industrial distillation equipment. Today, they remain integral to power generation, aerospace, chemical processing, and medical device manufacturing.

Because of their versatility, nickelchromlegeringar are produced in numerous standard grades by major metallurgical companies worldwide. Standards such as ASTM B446 and DIN 8344 specify the composition, mechanical properties, and testing methods for these alloys, ensuring consistency and reliability across different industrial applications.