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Steel MakingHeat-treating DepartmentThe heat-treating department occupies an L-shaped building. ... Carburizing By Gas The process of carburizing by gas, briefly mentioned on page ... Fatigue Tests It has been known for fifty years that a beam or rod would fa... Pyrometers Armor plate makers sometimes use the copper ball or Siemens' ... Carbon In Tool Steel Carbon tool steel, or tool steel as it is commonly called, us... Effect Of Different Carburizing Material [Illustrations: FIGS. 33 to 37.] Each of these different p... The Leeds And Northrup Potentiometer System The potentiometer pyrometer system is both flexible and subst... Tensile Properties Strength of a metal is usually expressed in the number of pou... Take Time For Hardening Uneven heating and poor quenching has caused loss of many ve... Classifications Of Steel Among makers and sellers, carbon tool-steels are classed by g... Non-shrinking Oil-hardening Steels Certain steels have a very low rate of expansion and contract... Heat Treatment Of Steel Heat treatment consists in heating and cooling metal at defin... Brown Automatic Signaling Pyrometer In large heat-treating plants it has been customary to mainta... Critical Points One of the most important means of investigating the properti... Blending The Compound Essentially, this consists of the sturdy, power-driven separa... Cyanide Bath For Tool Steels All high-carbon tool steels are heated in a cyanide bath. Wi... Application To The Automotive Industry The information given on the various parts of the Liberty eng... Separating The Work From The Compound During the pulling of the heat, the pots are dumped upon a ca... Double Annealing Water annealing consists in heating the piece, allowing it to... Correction By Zero Adjustment Many pyrometers are supplied with a zero adjuster, by means ... |
Preventing Decarbonization Of Tool SteelCategory: HARDENING CARBON STEEL FOR TOOLS It is especially important to prevent decarbonization in such tools as taps and form cutters, which must keep their shape after hardening and which cannot be ground away on the profile. For this reason it is well to put taps, reamers and the like into pieces of pipe in heating them. The pipe need be closed on one end only, as the air will not circulate readily unless there is an opening at both ends. Even if used in connection with a blacksmith's forge the lead bath has an advantage for heating tools of complicated shapes, since it is easier to heat them uniformly and they are submerged and away from the air. The lead must be stirred frequently or the heat is not uniform in all parts of the lead bath. Covering the lead with powdered charcoal will largely prevent oxidization and waste of lead. Such a bath is good for temperatures between 620 and 1,150 deg.F. At higher temperatures there is much waste of lead. Next: Annealing To Relieve Internal Stresses Previous: Steel For Chisels And Punches
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