Ost1 90202-75. Hot-rolled bars and rods of alloy BT16 uterus.
The present industry standard OST1 90202−75 applies to hot-rolled bars from titanium alloy grade BT16 for the manufacture of fasteners by hot landing and turning.
1.1. Dimensions of round bars shall meet the following requirements.
|Diameter, mm||Maximum deviations by diameter, mm|
2. Technical requirements
2.1. Titanium rods are supplied in hot-rolled condition without heat treatment.
By agreement of the parties, the bars are supplied in annealed condition.
2.2. The chemical composition of the alloys shall meet the requirements of OCT1 90013−71 (replaced by CT1 90013−81), the content of aluminium should be in the range of 2.2 to 3.8% and the hydrogen content — not more than 0,012%.
2.3.Mechanical strength shall meet the following requirements.
|Condition samples||Tensile strength, kgf/mm2||d5||y||KCU|
d5 — elongation at break.
y — the Relative narrowing
KCU — Impact strength kgf. m/cm22.4. On the surface of rods permitted individual imperfections in the form of a prisoner, Sabin, dents, and scratches, if it does not take the rod outside the negative deviation in diameter. Allowed Stripping and turning dornesti, if it does not take dimensions for limit deviation for diameter.
2.5. Grain size, determined on a 10-point scale macrostructure should not exceed the 3rd grade.
2.6. Microstructure, defined by 9-typical scale of the microstructure must match 1−6 type.
2.7. The macrostructure of the alloy must not have delamination, cracks, voids, metallic and non-metallic inclusions visible to the naked eye.
2.7.1. Surface defects within the negative deviation of the diameter permitted by clause 2.4. and the view of a macrostructure, a symptom of rejection are not.
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