Ost1 90218-76. Sheets of titanium alloys. Technical requirements.
The present industry standard applies to sheets made of titanium alloy grades BT1-OO, BTI-0, 0T4 series, BT5−1, VT6S, VT6, VT20 BT14 and used by the aviation industry.
1.3. Example of symbols in outfit order: sheet brand BTI-00 thickness of 5 mm, a width of 1000 mm and a length of 1500 mm.
Sheet VT1−00 — 5x1000x1500 OST 90218−76.
2. TECHNICAL REQUIREMENTS
2.1. The chemical composition of the alloys shall meet the requirements of OCT1 90013−81 the hydrogen content in the leaves is established: for grades BT1−00, BT1−0, 0T4−0, 0T4−1 and 0T4 — not more than 0,010%; alloy grade BT5−1 — not more than 0,012%; for grade alloy VT6, VT6S, BT14 and VT20 — not more than 0,015%.
2.2. Sheets are delivered after annealing and straightening annealing or after, progladte and bottoms.
2.3. The plates are supplied with the etched surface, evenly cut on all sides, no rough burrs at the trimmed edges.
Cut end Squareness, mm should not display the sheet for the limit deviations on width and length.
On the surface of the leaves but permitted: cracks, tears, delamination, remains of scale, slivers, metal and non-metallic inclusions visible to the naked eye.
The surface colour of the leaves, depending on the nature of alloy and method of production, rejection is but a symptom.
2.4. On the surface of the leaves allowed the prints from the rolls in the form of dents and bulges, and surface defects not specified in item 2.3., depth but exceeding minus thickness tolerances.
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