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Hardness comparison table. Brinell HB (10 mm Ball, 3000 kg load) Vickers HV (5 kg) Rockwell C HRC (120 degree cone 150 kg) Rockwell B HRB (1/16" ball 100 kg)
Mill scale is a complex oxide that contains around 70% iron with traces of nonferrous metals and alkaline compounds. Reduced iron powder may be obtained by conversion of mill scale into a single highest oxide i.e. hematite (Fe 2 O 3) followed by reduction with hydrogen.
This could be converted into wrought iron using the Aston process for a fraction of the cost and time. For comparison, an average size charge for a puddling furnace was 800–900 lb (360–410 kg) [10] while a Bessemer converter charge was 15 short tons (13,600 kg). The puddling process could not be scaled up, being limited by the amount that ...
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Flake hammerscale forms due to the rapid oxidation of hot iron in air. A heated piece of iron will develop an external layer of iron oxide which then may separate from the original piece due to a hammer strike or differential thermal contraction. [6] Flake hammerscale is produced in large quantities during multiple stages of the smithing ...
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