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【范围】
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1.1 Purpose
This specification covers the procedures for approval of products of premium-quality titanium alloys and the controls to be
exercised in producing such products.
1.1.1 This specification requires approved sources (See 3.1 and 4.4).
1.2 Application
This specification has been used typically for parts fabricated from titanium alloys that require approval of the product and
facets of its production to ensure that production lots are of the same metallurgical quality, are produced by the same
basic procedures as the products originally qualified, and for parts subjected to rigid inspection standards throughout
manufacture from ingot to finished part, but usage is not limited to such applications.
1.3 Classification
This specification covers four grades of premium-quality titanium alloy products based on the melting practice used in
making the alloy, as follows:
Grade 1 - Double Consumable Electrode Vacuum Arc Melted
Grade 2 - Triple Consumable Electrode Vacuum Arc Melted
Grade 3 - Electron Beam Cold Hearth Refined (EBCHR) Followed by a Single Consumable Electrode Vacuum Arc
Melt
Grade 4 - Plasma Arc Melted Cold Hearth Refined (PAMCHR) Followed by a Single Consumable Electrode Vacuum
Arc Melt
1.3.1 Any grade may be supplied unless a specific grade is specified. The grade supplied shall be reported.strRefField
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