This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1865 Excerpt: ...presents an anomaly not to be found in any other of the staple manufactures of this country. When in the state of cast-iron, the metal contains 4 per cent of carbon, has a tensile strength of 18,000 lbs. per square inch, and is worth 3 per ton. Deprive it of this 4 per cent of carbon, and it becomes malleable iron; it ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1865 Excerpt: ...presents an anomaly not to be found in any other of the staple manufactures of this country. When in the state of cast-iron, the metal contains 4 per cent of carbon, has a tensile strength of 18,000 lbs. per square inch, and is worth 3 per ton. Deprive it of this 4 per cent of carbon, and it becomes malleable iron; it has then a tensile strength of 56,000 lbs. per square inch, and is raised in value from 3 to 8 per ton. But if we leave in it 1 per cent of the carbon it originally contained, it will have a tensile strength of at least 130,000 lbs., and its selling price will have risen from 8 to 50 per ton. Such facts may well suggest the question: Cannot iron be purified, and this 1 per cent of carbon be left in it, without raising its cost to 50 per ton?--Cannot we have the great cohesive strength, the hardness and the homogeneous character of iron fully developed, without that commercial barrier which the old system of making cast-steel has ever placed in the way of its employment for all constructive purposes. Until very recently, cast-steel has been considered to be a hard and brittle material, and has been employed almost exclusively for cutting tools--its hardness, and the difficulty of working it, rendering it unfit to take the place of iron for general purposes. Well carbonised cast-steel, made by the Bessemer process, has been found to bear a tensile strain of 160,000 lbs. per square inch; while pure decarbonised iron, made by the same process, will only bear on an average 72,000 lbs. Within these limits, however, there is an ample margin for the manufacture of several distinct qualities of malleable metal, each especially suited to peculiar uses. Thus, steel containing 1. per cent of carbon, and capable of beari...
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