Titanium Nozzle Durability: How Does it Withstand Extreme Temperatures?

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Titanium nozzles withstand extreme temperatures due to the cooling effect of gas flow, which prevents them from reaching their melting point of 1668 degrees Celsius, despite flames reaching 3200-3500 degrees Celsius. The discussion highlights that materials like brass are used in acetylene torches, which can cut through steel, indicating that nozzle materials must be carefully selected based on their thermal properties. Concerns are raised about using titanium for nozzles, as it ignites at lower temperatures and burns fiercely in air, making it a questionable choice. The effectiveness of nozzle materials in high-temperature applications is critical for safety and performance. Overall, the choice of nozzle material is essential to ensure durability and functionality in extreme conditions.
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Why does the nozzle not melt even when the melting point of titanium at 1668 degree Celcius, and the flame of the flame is up to 3200-3500 degree Celcius.
 
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Assuming that what is burning coming out of the nozzle is gaseous, the flow of the gas through the nozzle will cool it. (The cooling effect would work with liquid too)

Acetylene torches for example, IIRC, have brass nozzles (with several small holes for the oxygen and acetylene to emerge) and can cut through steel, a much higher melting point material. Oxy-hydrogen torches can cut through reinforced concrete, and concrete is VERY refractory.
 
What type of nozzles do you think are made from titanium? Considering it catches fire at a lower temperature than it melts and burns fiercely in air (similar to magnesium, if you have seen that demonstrated in a chemistry lab) that would be a very dumb idea.
 

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