Ost1 90173-75. The rolled bars from titanium alloys. Technical requirements.
1.1. The size of the titanium rod and their limit deviations must satisfy the following requirements.
|Diameter, mm||Maximum deviations by diameter, mm|
a) random lengths —
bars with a diameter from 10 to 18 mm in length from 1.0 to 4.0 m;
bars with a diameter from 20 to 60 mm lengths from 1.0 to 6.0;
b) dimensional and multiple lengths, within random.
1.4. Curvature 1 TDG. m should be no more than 5 mm.
1.5. Ovality should not display their dimensions for limit deviation for diameter.
2. Technical requirements
2.1. Titanium rods are supplied in hot-rolled condition without heat treatment.
2.2. The chemical composition of the alloys shall meet the requirements of OCT1 9001З-71 (replaced by CT1 90013−81).
2.3.Mechanical properties must meet the following requirements.
|Grade||Test temperature, °C||Tensile strength, kgf/mm2, not less||Long-term strength. Stress, kgf/mm2||Test duration, hours.|
Allowed in the macrostructure of bars in all grades of alloys the presence of certain sites with a grain size not exceeding 6-th points, if the total area of these plots does not exceed 20% of the area of macrolife.
2.8. Microstructure of bars from alloys VT6S, VT6, BT3−1 and VT14, defined by 9-typical scale (see instruction # 695−69) must match the 1−7 type.
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