MIL-STD-792F(SH)
19 May 2006
5.10.5 Type I, type II, type VII, type VIII and type IX permanent markings used on carbon steel shall be covered with a preservative to prevent corrosion of the marking. The preservative shall be in accordance with MIL-PRF-16173.
5.10.5.1 Permanently marked carbon steel items may be stored without a preservative for 30 days or less. This short term storage must be dry indoor storage. For shipyards, storage times may be greater than 30 days based on their standard practices and experience that assure the legibility of marking is maintained.
5.10.5.2 Small permanently marked carbon steel items do not require a preservative if they are stored indoors in sealed polyethylene bags. The polyethylene bags shall conform to MIL-DTL-24466.
5.10.6 Type V permanent marking may be used on carbon steel, except carbon steel with a specified carbon content of greater than 0.35 percent. Type V permanent marking may be used on other materials only when specified or approved by NAVSEA or an authorized representative as defined in 3.5. This does not supersede requirements as specified in 5.9.2 or
5.9.3.
5.10.7 Type VIII permanent marking shall be used only on surfaces that are unwetted
in service. When type VIII marking is used on materials which require post weld heat treatment, it shall be performed before the post weld heat treatment.
5.11 Limitations on temporary identification or layout marking.
5.11.1 Type I, type V, type VII, type VIII, and type IX permanent marking and type D and type E temporary marking may be used only when the depression is blended smoothly into the general contour without violating the minimum wall thickness. The radius at the bottom of all areas resulting from the removal of such markings shall be at least three times the depth of the depression.
5.11.2 Type A, B, and F temporary marking shall be removed prior to being exposed to thermal treatments including preheat and heat of welding, except that type A and type F marking may remain on materials provided:
(a) It has been demonstrated by the organization proposing to use the marking fluid for temporary identification through thermal treatments that any material so marked is not affected when exposed to the thermal treatment.
(b) Each lot of marking material is demonstrated by test to be non-detrimental for each material so marked. Two specimens (marked as in production marking) of each material to be marked along with one unmarked specimen shall receive a heat treatment at the maximum temperature for the maximum time as that used during production heat treatment. One longitudinal specimen shall be removed from each specimen and shall be metallographically inspected at a minimum of 100X magnification to assure that there has been no interaction of the marking material with the base
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