Tungsten: Tungsten is an extremely hard metal with excellent wear and corrosion resistance. It has applications in many industrial fields, such as tool manufacturing, jet engines, and various high-temperature components.

Tantalum: Tantalum is a light, dense metal with a high melting point and vapor pressure. Its chemical stability makes it widely used in electronics, metallurgy, chemical industry and other fields.

Molybdenum: Molybdenum is an element that maintains strength at extremely high temperatures and is primarily used in the manufacture of high-temperature furnaces and other heat-resistant components.

Niobium: Niobium is a hard and corrosion-resistant metal that can withstand high temperatures and is used in nuclear reactors.

Zirconium: Zirconium is a metal with a high melting point and is sometimes called a refractory metal, especially when compared to other metals.

Chromium: Chromium is a versatile metal with a high melting point and resistance to oxidation, so it is often used as a component of stainless steel and other heat-resistant materials.