\
(.
,, . . . ,..
..,”
~NOT MEASUREMENT SENSITIVE
MIL-H-6875H
1 March 1989
SUPERSEDING
MIL-H-6875G
16 September 1983
MILITARY SPECIFICATION
HEAT TREATMENT OF STEEL, PROCESS FOR
This speclflcatlon is approved for use
by all Departments and Agencies of the
Department of Defense.
1.
SCOPE
1.1 Scope.
This spec!flcatlon covers the requirements for heat-treatment of
four classes of steel (see 1.2) and the requirements for furnace equipment, test
procedures and information for heat-treating procedures, heat-treating
temperatures and material (see 6.11) test procedures. It is applicable to all
heat treatment of parts and to only the heat treatment of mill products which
could affect Its fabricab!l!ty or the properties of parts.
This specification
also describes procedures which,
when followed, wI1l produce the desired
properties and material qualitles within the limitations of the respective
alloys tabulated In Tables
IA, IB, IC and ID. A11OYS other than those
specifically covered herein may be heat treated using all applicable
requirements of this specification.
1.1.1 Limitations. Unless otherwise speclfled, this specification is not
applicable to heating or to intermediate (non-final) heat treatment, of raw
material, e.g.
for hot working.
Processes not covered Include deliberate
surface heat-treating and spectaltzed heat-treating, such as
induction
hardening, flame hardening, carburizlng, nltriding; however, this specification
may be referenced for equipment and controls.
Austemperlng, ausbay quenching
and martemperlng may
be used when specified by the cognizant engtneer!ng
organization.
1.2 Classification.
Steels covered by this specification are classified
into the followlng four classes.
Unless otherwise specified, the process and
equipment requirements In this specification refer to all classes of steel
tabulated In Tables IA,
IB, IC and ID, respectively.
Class A
- Carbon and low alloy steel
Class B -
Martensltic corrosion-resistant steel
Class C -
Austenitlc corrosion-resistant steel
Class D -
Prectpitatlon-hardening and maraging steel
8eneflclal comments (recommendations,
additions, deletlons) and any pertinent
data
With may be of use in improving this document should be addressed to:
Systems Engineering and Standardization Department (Code 53), Naval Air
Engineering Center,
Lakehurst,
NJ 08733-5100, by using the self-addressed
Standardization Document Improvement Proposal (DD Form 1426) appearing at the
end of this document or by
letter.
AMSCN/A
FSC 95GP
DISTRIBUTION ~TATEMFN~ A
Approved for public rr?lease; distribution Is unliml’
.=...------—
ed.
Downloaded from http://www.everyspec.com
