The Manufacture and Properties of Iron and Steel

The Manufacture and Properties of Iron and Steel

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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. 1904 edition. Excerpt: ... allotropic theory in several articles and has evolved an hypothesis of his own which he calls the "subcarbide theory," on the supposition that hardening is due to the retention of a hard sub-carbide of iron Fe, C. These theories will be found thoroughly considered in the volumes of the Iron and Steel Institute of the past few years. Enough is given here to show the variety of ideas, all of which have their strong and their weak points. CHAPTER XVI. THE HISTORY AND SHAPE or TIIE TEST-PIECE. SEO. XVIa.--Di/ferences in physical properties between the surface and the interior of worked steel.----The first question that arises in the inspection of steel is the manner in which the testpiece shall be taken. In former days it was the custom to carefully plane or turn a piece to a standard size, with a certain length between shoulders and a certain radius for the terminal fillets; but this method is both tedious and expensive with no corresponding advantages. It is still used in steel castings, for it is impossible to cast a bar of sufliciently accurate section to be fit for a. tensile test, and it is also used in the case of forgings where the piece is too large to be broken in full section, and when it is deemed advisable to carve a piece from the finished material. In all other work the test is either a part of the finished bar, as in the case of small rounds and flats, or is cut from the member, as in the case of angles, channels, etc., with two sides of the piece in the. condition in which they left the rolls. A sufficient length is taken to allow about 10 inches between jaws, and the readings are made on an 8-inch length which is defined by marks of a center-punch. A machined piece is generally inferior to a bar as it leaves the rolls....show more

Product details

  • Paperback | 272 pages
  • 189 x 246 x 14mm | 490g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236507215
  • 9781236507211