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If you look at the melting points of different metals:

Tin: 232°C

Lead: 327°C

Copper: 1083°C

Iron: 1535°C

Iridium: 2410°C

Niobium: 2468°C

Molybdenum: 2617°C

Tantalum: 2996°C

Osmium: 3045°C

Rhenium: 3180°C

Tungsten: 3410°C

Carbon: 3500°C

Molybdenum alloys are often used in high temperature resistant applications such as aircraft afterburners.

Tungsten and Tungsten alloys are often used in high temperature filaments and heater coils.

Niobium is a light weight heat resistant metal.

The hardest material known is still Diamond (Mohs Hardness 10)

Tungsten Carbide is one of the hardest and most durable metal alloys, Mohs 9

There are forms of Carbon Steel that do very well for strength and hardness.

Some of the new ceramics such as:

Aluminum Oxide Mohs 9

Boron Carbide Mohs 9-10

Silicone Carbide Mohs 9-10

See Reference Links.

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