Rod, bar made of titanium gost OT-4, OT4-0, OT4-1
A wire, a bar, a rod are much-required types of titanium semi-fabricates. Alloys of OT grades relate to pseudo α-alloys of small heat-resistance but a high plasticity. Their heat-resisting properties strongly depend on cooling speed. An intermediate speed cooling between a cooling in water or in furnace gives the products the lowest level of creep.
|Alloy||t° at the end of recrystallizing||t° at the beginning of recrystallizing||Bars, forgings. t° of annealing|
|OT4−0||800°||680°||690 — 740°C|
|Titanium gost OT-4||860°||760°||740 — 760°C|
|Titanium gost OT4−1||840°||720°||740 — 790°C|
In order to decrease a retained stress, there is used a partial annealing at a temperature that is lower than a temperature of recrystallizing. An endurance of annealing constitutes 0,5 — 2 h. with a further cooling in the air.
|Semi-fabricate||Thickness, mm||Plasticity δ%||Strength (MPa)||KCU J/cm³|
|Titanium gost OT4−0 bar||10 — 60||more than 45%||490 — 637||more than 70|
|Titanium gost OT4−0 bar||101 — 150||more than 17%||441 — 637||more than 50|
|Titanium gost OT4−0 bar||140 — 250||more than 17%||441 — 637||more than 60|
|Titanium gost OT4−0 bar||65 — 100||more than 45%||more than 70|
|Titanium gost OT4−0 bar||140 — 250||more than 17%||more than 70|
|Titanium gost OT4−0 bar||10 — 60||more than 15%||588 — 735||more than 45|
|Titanium gost OT4−0 bar||65 — 100||more than 15%||588 — 735||more than 45|
|Titanium gost OT4−0 bar||100 — 150||more than 12%||539 — 735||more than 40|
|Titanium gost OT4−1 bar||140 — 150||more than 12%||539 — 735||more than 40|
|Titanium gost OT4−1 bar||151 — 250||more than 12%||539 — 735||more than 45|
|Titanium gost OT4−1 bar||Ø10 mm||20||655||70|
|Titanium gost OT4−1 wire||Ø 1.0 — 1.4||more than 7.5%||up to 785||---|
|Titanium gost OT4−1 wire||Ø 1.5 — 3.0||more than 9%||---|
|Titanium gost OT4−1 wire||Ø 3.5 — 7.0||more than 12%||---|
|Titanium gost OT4 bar||10 — 60||more than 11%||686 — 883||more than 30|
|Titanium gost OT4 bar||65 — 100||more than 10%||more than 30|
|Titanium gost OT4 bar||101 — 150||more than 8.5%||637 — 883||more than 35|
|Titanium gost OT4 bar||140 — 250||more than 8.5%||637 — 883||more than 35|
|Titanium gost OT4 bar||140 — 250||more than 10%||657 — 883||more than 40|
|Titanium gost OT4 bar||Ø18 mm||26||835||54|
|Titanium gost OT4 calibrated bars||Annealing||804||13.5|
|Titanium gost OT4 calibrated bars||Annealing||1100°С+750°С — 1 h in the air||745||15||13.5|
|Titanium gost OT4 calibrated bars||1100°С+1020°С, water +900°С 1 h. with a furnace up to 650°С||1100°С+750°С — 1 h in the air||745||15||16|
|Titanium gost OT4 calibrated bars||Annealing 800 °C 1 h.||1100°С+1020°С, water +900°С 1 h. with a furnace up to 650°С||806||30||16|
Deformable semi-products have more or less pronounced anisotropy of properties. Coefficient of alloy hardening takes into account an effect of alloying. This effect strengthens a relationship between units. This coefficient is increased from 1.18 in pure titanium up to 1.32 in hard-alloyed grades with an increased number of components. Coefficient equals to 1,23 for titanium alloy gost OT4−0. Semi-fabricates of grade OT are easy to weld with any types of welding.
In comparison with other grades of titanium, it possesses relatively low heat resistance and strength, propensity to hydrogen frailty. Manufacture technology refers to expensive and time consuming due to a relatively high resistance to cold deformation. Hot titanium simply interacts with atmospheric gasses. However, it poorly conducts heat by creating large temperature gradients at treatment. Therefore, a cost of finished products is much higher than a price of feedstock.
Structural efficiency, erosion, corrosion resistance, ballistic resistance and other advantages of OT grade semi-products make their use feasible in engineering. Details that can be manufactured: parts of connecting rods, valves, crank and cam shafts, transmission components, bolts, springs, crutch parts. For example, manufacture of titanium connecting rods enables to reduce a load on connecting rod bearings for 30%. At the same time, it greatly increases their durability and reliability.
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