The established melting point temperature of pure iron is__________________?
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Answer: A. 1539°C
Explanation
The standard established melting point temperature of chemically pure iron is approximately 1539 degrees Celsius. At this precise thermal threshold, pure metallic iron transitions completely from a solid crystalline lattice into a liquid phase. Alloying elements like carbon significantly alter this pure melting point and introduce specific phase transformation temperature ranges. Pure iron is a transition metal characterized by allotropic crystal transformations occurring at various temperatures before melting. Thermal analysis and phase diagrams provide metallurgists with precise data regarding melting and solidification behaviors of iron alloys. Commercial iron products contain varying percentages of carbon, sulfur, and silicon which depress the liquidus and solidus temperatures.
Option B (1601°C) overestimates the melting temperature of chemically pure iron beyond established metallurgical standards. Option C (1489°C) is too low for pure iron and corresponds more closely to carbon-containing steel alloy liquidus temperatures. Options D and E are incorrect because rigorous thermal experiments consistently verify the 1539°C melting point for pure iron.
- Subject
- Engineering
- Category
- Mechanical Engineering
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- —
- Difficulty
- medium
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