Heat treating and inspection of metals Page: 2
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
TECHNICAL MANUAL C 1
poses to to one of the following structures depending on the
rate of cooling: martensite, troostite, sorbite, and finally pearlite.
* * * * * *
[A. G. 062.11 (1-10-42).] (C. 1, Mar. 10, 1942.)
9. Case hardening.
* * * * * * *
c. Nitriding.-(1) This method of case hardening is advantageous
due to the fact that a harder case is obtained than by carburizing.
Many engine parts such as cylinder barrels; gears, etc., may be treated
in this way. Nitriding can only be applied to certain special steel
alloys, one of the essential constituents of which is aluminum. The
process involves * * * the composition of which is given in
table IV.
* * * * * * *
[A. G. 062.11 (1-10-42).] (C. 1, Mar. 10. 1942.)
15. Nickel steel (SAE 2330).
* * * * * *" *
b. Hardening.-In hardening nickel steel, the furnace temperature
should not exceed 1,100 F. when the parts are inserted; the tempera-
ture must then be gradually increased to 1,430-1,5000 F. This steel
should be quenched in oil.
* * * * * * *
[A. G. 062.11 (1-10-42).] (C. 1, Mar. 10. 1942.)
16. Chrome-molybdenum steel (SAE X-4130 and X-4135).
* * * * * * *
c. Tempering.-Hardened parts may be tempered * * * is ac-
complished in still air.
Tempering ten perature Ultimate strefiyth
( 1'.) (pounds per square inch)
1, 075----------------------------------125, 000
1, 000 1----------------------------------50, 000
800----------------------------------180, 000
650 ----------------------------------200, 000
[A. G. 062.11 (1-10-42).] (C. 1, Mar. 10. 1942.)
18. Chrome-nickel steel (SAE 3140).
* * * * * * *
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
to between 1,4750 and 1,525 F., which is the required hardening
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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/m1/67/?rotate=270: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.