Heat treating and inspection of metals Page: 25
57 p: ill., diagrs., tables. Enclosed at end: Change 1 (4 pages)View a full description of this book.
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TM 1-423
HEAT TREATING AND INSPECTION OF METALS 16-18
then gradually brought to the required heat. In all cases, cooling
is accomplished in still air.
Tempering temperature Ultimate strength
( F.) (pounds per square inch)
1,075111111111 125, 000
1,00011111111111111111111111111_ 1 150, 000
950-----------------------------------180, 000
650 -----------------------------------200, 000
17. High carbon chrome-molybdenum steel (SAE 4140).-
Due to higher carbon content, this steel responds more readily to heat
treatment than X-4130 steel. It is used extensively for heavy parts,
machined from bar or forging stock. The heat-treatment procedure
for this steel is identical with that described for X-4130 with the
exception of the temperatures used.
a. Annealing and normalizing are accomplished at a temperature
of between 1,600 and 1,700 F.
b. Hardening is accomplished at a temperature of from 1,525 to
1,6250. F.
c. Tempering for aircraft requirements may be accomplished at any
of three different temperatures, each producing a different ultimate
strength.
Tempering temperature Ultimate strength
( F.) (pounds per square inch)
1,250-----------------------------------100,000
1,100______ -----------------------------------125,000
650----------------------------------- 200,000
18. Chrome-nickel steel (SAE 3140).-This steel may be used
for heat-treated forgings that require greater strength and toughness
than are obtainable with the plain carbon steels. Examples of its
use may be found in connecting rods, crankshafts, etc.
a Annealing.-Both annealing and normalizing may be accom-
plished by slow heating to between 1,550 and 1,650 F. In normal-
izing, cooling should be done in air after the required soaking.
b. Hardening.-After inserting the parts in the furnace at a tem-
perature of 1,100 F. or less, the heat should be gradually increased
between 1,4750 and 1,5250 F., which is the required hardening tem-
perature. After the soaking period the parts should be removed
from the furnace and quenched in oil.
c. Tempering.-The ultimate strength produced by tempering de-
pends upon the temperature used. The furnace temperature prior
to the insertion of the parts should be well below the tempering
temperature.
4o0590 --41 -4 25
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United States. War Department. Heat treating and inspection of metals, book, September 10, 1941; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc96657/m1/27/?rotate=90: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.