title: Hardening, tempering, annealing and forging of steel ;: A treatise on the practical treatment and working of high and low grade steel
author: Joseph Vincent Woodworth
description: This book is a facsimile reprint and may contain imperfections such as marks, notations, marginalia and flawed pages.
zlib_text: 508
  HEAT TREATMENT OF STEEL
  HEAT-TREATING HIGH-SPEED STEELS
  Heat Treating High-Speed Steels
  Cobaltcrom Steel.—A tungstenless alloy steel or high-speed steel that contains approxi-
  mately 1.5 per cent carbon, 12.5 per cent chromium, and 3.5 per cent cobalt. Tools such as
  dies and milling cutters, made from cobaltcrom steel can be cast to shape in suitable molds,
  the teeth of cutters being formed so that it is necessary only to grind them.
  Before the blanks can be machined, they must be annealed; this operation is performed
  by pack annealing at the temperature of 1800 degrees F, for a period of from three to six
  hours, according to the size of the castings being annealed. The following directions are
  given for the hardening of blanking and trimming dies, milling cutters, and similar tools
  made from cobaltcrom steel: Heat slowly in a hardening furnace to about 1830 degrees F,
  and hold at this temperature until the tools are thoroughly soaked. Reduce the temperature
  about 50 degrees, withd