The Society of Automotive Engineers have adopted certain heat treatments to suit different steels and varying conditions. These have already been referred to on pages 39 to 41 in connection with the different steels used in automobile practice. These treatments are designated by letter and correspond with the designations in the table.

HEAT TREATMENTS

Heat Treatment A

After forging or machining:

  1. Carbonize at a temperature between 1,600°F. and 1,750°F. (1,650-1,700°F. desired.)
  2. Cool slowly or quench.
  3. Reheat to 1,450-1,500°F. and quench.

Heat Treatment B

After forging or machining:

  1. Carbonize between 1,600°F. and 1,750°F. (1,650-1,700°F. Desired.)
  2. Cool slowly in the carbonizing mixture.
  3. Reheat to 1,550-1,625°F.
  4. Quench.
  5. Reheat to 1,400-1,450°F.
  6. Quench.
  7. Draw in hot oil at 300 to 450°F., depending upon the degree of hardness desired.

Heat Treatment D

After forging or machining: