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MIL H 6875H (修正2) 钢材热处理工艺 (1998年10月27日) [S S E A M S H 6875]

ID：52179

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页数：6页

时间：2023-03-23

金币：20

上传者：战必胜
MIL-H-6875H
AMENDMENT 2
27 October 1998
SUPERSEDING
AMENDMENT 1
16 July 1993
MILITARY SPECIFICATION
HEAT TREATMENT OF STEEL, PROCESS FOR
This amendment forms a part of MIL-H-6875H, dated 1 March 1989, and is approved for
use by all Departments and Agencies of the Department of Defense.
PAGE 1
* Title heading: Delete the current title and substitute: "HEAT TREATMENT OF STEEL
RAW MATERIALS".
* 1.1: Delete the second sentence and substitute: “This specification is applicable only to the
heat treatment of raw material (see 6.1.1); it does not cover the requirements for the heat
treatment of steel parts (see 3.4 and 6.1.2)."
PAGE 4
3.1.1.1: For "Nitrogen", under the "Class D" column, delete "No" and substitute "X 10/",
and add a new footnote:
"10/ The use of a nitrogen atmosphere shall be limited to heat treating temperatures of 1400°F
and below. A nitrogen atmosphere may be used for heat treatment above 1400°F provided
a minimum of 0.020 inches of metal is subsequently removed from all surfaces of heat
treated material. "
3.1.1.1: For “Vacuum”, under the “Class D” column, add "11/" next to the “X” and add a
new footnote:
"11/ Nitrogen is not permitted as a partial pressure above 1400°F. Nitrogen may be used as a
backfill quench for vacuum heat treatments performed at or below 1925°F.”
AMSC N/A 1 of 3 FSC 95GP
Distribution Statement A Approved for public release; distribution is unlimited.
INCH-POUND
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