Mining and Metallurgy Volume 19-24

Mining and Metallurgy Volume 19-24

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ... of cooling seems to have been about as follows: From 1,200 1, l00 to 1,000 to 900 to 800 to 700 to to 1,100. 1,000. 900. 800. 700. 600. Minutes, est., 6 9 12 15 18 26 Certain of the slowly-cooled pieces were then reheated to the temperatures given under 17A and 18A, and then held there for either 0.5 hr. or 2 hr., and then quenched in water. N o. 19. Charpy, Revue ole llletallurgie, vol. v., N o. 2, Memoires, p. 77 (Feb., 1908). Swedish wrought-iron was cemented and melted in a crucible with an excess of wood-charcoal, and allowed to cool slowly in the crucible, when it contained 3.34 per cent. of graphite and 0.41 per cent. of combined carbon, together with "about 0.10 per cent. of silicon and of manganese, and traces of sulphur and phosphorus." Pieces of this metal 4 cm. cube were then held at the temperatures stated in the table for from.6 to 7 hr. in the 750 and 850 heatings, and 3 hr. in the others, then quenched in water, and reheated to 500 to soften them enough to be cut. 2 mm. were then cut off the faces of each cube. Then filings were taken for analysis. N o. 20. Idem. He proceeded as in No. 19, except that the molten metal was cast in a metallic mold, when it contained 2.82 per cent. of combined carbon and no graphite. It was then reheated to 1, l50, doubtless to start the formation of graphite, then cooled very slowly to 1,000 and quenched. After removing the oxidized outside the remainder contained 1.82 per cent. of graphite and 0.92 per cent. of combined carbon. No. 21. Idem. He proceeded in the same way, except that the crucible containing the molten cast-iron was set in a furnace at 1,000, so that the iron passed directly but very slowly to 1,000. After staying at 1000 for 3 hr. it was quenched in cold...
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Product details

  • Paperback | 500 pages
  • 189 x 246 x 26mm | 885g
  • United States
  • English
  • black & white illustrations
  • 1236891775
  • 9781236891778