A text-book on chemistryFor the use of schools and colleges . 342 IRON. sand times in a minute. The melting point of iron isvery high, about 3300°. In the mode of preparing it^ nOK from cast iron it does not under- go the process of fusion, but itsparticles are simply welded to-gether. The fibrous structurewhich wrought iron possesses,Fig. 285, is the chief cause of itsgreat tenacity; a wire -g^th ofan inch in diameter will bear aweight of sixty pounds. Steely which is a valuable preparation of iron, is madeby placing alternate strata of iron bars and charcoalpowder in a close box and keeping
A text-book on chemistryFor the use of schools and colleges . 342 IRON. sand times in a minute. The melting point of iron isvery high, about 3300°. In the mode of preparing it^ nOK from cast iron it does not under- go the process of fusion, but itsparticles are simply welded to-gether. The fibrous structurewhich wrought iron possesses,Fig. 285, is the chief cause of itsgreat tenacity; a wire -g^th ofan inch in diameter will bear aweight of sixty pounds. Steely which is a valuable preparation of iron, is madeby placing alternate strata of iron bars and charcoalpowder in a close box and keeping them red-hot. Theprocess is known by the name of cementation. Theiron gains about per cent, of carbon. Steel is muckmore fusible than iron, and becomes excessively hardand brittle by being brought to a red heat, and thensuddenly quenched in cold water. When allowed tocool slowly it is quite soft, but various degrees of elas-ticity and hardness may be given to the hardened steelby the process of tempering, which is effected by againheating it up to a fi
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