MIL-DTL-12560K (MR)
3. REQUIREMENTS
3.1 First Article. When specified in the contract or purchase order (see 6.2, 6.5 and 6.9), a sample
or samples of the specified item shall be made available to the contracting officer or his
authorized representative for approval in accordance with 4.4. The contractor shall comply with
this requirement at the time of his first order or contract and at any time that the supplier has not
furnished the same class of wrought armor plate in the applicable thickness range under this
specification within a period of 37 months. The approval of the first article samples authorizes
the commencement of shipment but does not relieve the supplier of responsibility for compliance
with all applicable provisions of this specification, namely conformance or production
acceptance. The first article samples and test plates shall be manufactured by the process
proposed for use on production armor. This process shall be inspected by a cognizant
government representative to ensure compliance with the details of this specification. The
manufacturer's declared chemical analysis shall be submitted to the contracting agency and to the
ballistic test agency. The ballistic test agency shall record the first article ballistic test plates
submitted, showing the dates tested. Requests from the procuring activity to the ballistic test
agency as to prior conformance with first article tests shall be accompanied by copies of the first
article test firing records. Any deviation(s) noticed by the ballistic agency shall be brought to the
attention of the contracting activity and to the manufacturer.
3.1.1 First time producer. First time producers wishing to qualify to this specification shall
follow the instructions of 6.7.
3.2 Production acceptance.
3.2.1 Chemical composition. A declared chemistry shall be submitted to the contracting agency
or its authorized representative and to the ballistic test agency. The chemical composition of the
declared chemistry shall conform to the requirements of Table I, column A, unless otherwise
specified in the contract or purchase order (see 6.2). If an analysis of Antimony, Arsenic or Lead
is required, it shall be specified in the contract or purchase order (see 6.2). A single heat cannot
be dual certified to both MIL-DTL-12560 and MIL-DTL-46100. The chemical composition
shall be determined by a product analysis (values shall be listed as weight percent) in accordance
with 4.6.1.1 and 4.8.1. The first article samples and the production test plates shall utilize the
same declared chemistry within the allowable ranges proposed for use in production.
A
statement showing the heat analysis of each melt and one product analysis of each lot, complete
details of the heat treatment, and all mechanical properties of each lot of production plates shall
be furnished for the files of the purchaser at no cost. All elements of the chemical composition
specified in Table I shall be shown in the statement. This statement shall be attached to the
completed Rolled Homogeneous Armor Test Data Form (see Figure 1), or other certifications
containing the same information.
3.2.2 Carbon equivalence. Carbon equivalence (CE) shall be calculated for each heat per ASTM
A6/A6M, i.e.
CE = C + [Mn/6] + [(Cr + Mo + V)/5] + [(Ni + Cu)/15]
where the elements are expressed in wt%.
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