As a metallurgical engineer with years of experience in material science, I can provide you with a detailed explanation of the concept of a "red-hot" iron and its temperature.

The term "red-hot" is a colloquial expression used to describe the temperature at which iron begins to glow due to incandescence. This phenomenon occurs when a material is heated to a high enough temperature that it emits visible light. The color of the light emitted is a result of the material's temperature and the black body radiation it produces.

According to the Planck's law of black-body radiation, the color of the light emitted by an object is directly related to its temperature. As the temperature of iron increases, it will first glow red, then orange, yellow, and eventually white as it reaches even higher temperatures.

The temperature at which iron is considered "red-hot" is typically around 700 degrees Celsius (1292 degrees Fahrenheit). This is the temperature at which iron starts to emit a noticeable red glow. It's important to note that this is a rough estimate and can vary depending on various factors such as the purity of the iron, the presence of impurities, and the environment in which it is heated.

As the temperature of iron increases beyond the "red-hot" stage, it reaches the "white-hot" temperature, which is approximately 1094 degrees Celsius (1993 degrees Fahrenheit). At this point, the iron is glowing with a bright white light, indicating that it is very close to its melting point.

Iron becomes viscous enough to pour into molds at temperatures between 1100 and 1150 degrees Celsius (2010 to 2100 degrees Fahrenheit). This is a critical temperature range for casting processes, where the iron is still in a liquid state but has not yet reached its melting point.

The melting point of pure iron is 1538 degrees Celsius (2800 degrees Fahrenheit). This is the temperature at which iron transitions from a solid to a liquid state. However, in practical applications, iron is often an alloy containing other elements, which can affect its melting point.

It's also worth mentioning that the "red-hot" temperature can be influenced by the presence of impurities. For example, carbon in steel can lower the temperature at which it glows red. This is why steel, which contains carbon, can be red-hot at temperatures slightly lower than pure iron.

In conclusion, the "red-hot" temperature of iron is a significant point in its thermal profile, marking the transition from a non-luminous to a luminous state. Understanding this temperature and the associated color changes is crucial for various industrial processes, such as forging, welding, and casting, where precise temperature control is necessary.

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Iron's "red-hot" temperature is right at 700 degrees Centigrade, "white-hot" temperature is at 1094 degrees Centigrade, it becomes viscous enough to pour into molds at about 1100-1150 degrees Centigrade, and its melting point is 1538 degrees Centigrade.Feb 11, 2005read more >>