Circle, bar OT-4
International Equivalent
| Mark | Analogue | W. Nr. | Aisi Uns | En | Order |
|---|---|---|---|---|---|
| OT4 | Delivery from the stock, in stock | ||||
| OT4-0 | Delivery from the stock, in stock | ||||
| OT4-1 | Delivery from the stock, in stock |
Product Features
Wire, rounds and bars are among the most popular semi-finished steel products. Alloys OT-4, OT4-0 and OT4-1 belong to titanium pseudo-α-alloys of high ductility and low heat resistance. Their high-temperature properties depend significantly on the cooling rate. The lowest creep rate is observed after cooling of semi-finished products at some intermediate rate between cooling with furnace and in water.
| Alloy | t° beginning of recrystallization | t° end of recrystallization | t° of annealing. Bars and forgings |
|---|---|---|---|
| OT4-0 | 680° | 800° | 690 - 740° |
| OT4-1 | 720° | 840° | 740 - 790° |
| OT-4 | 760° | 860° | 740 - 760° |
To reduce residual stresses after technological operations in some cases they use incomplete annealing at temperatures below recrystallization start temperature during 0.5-2 hours with subsequent cooling in air: FROM4-0 - 480-520°C, FROM4-1 - 520-560°C, FROM4 - 545-585°C.
Basic qualities of OT4-0, OT4-1, OT4 wire, rounds, bars
| Titanium bar | Thickness (mm) | Heat treatment | Strength (MPa) | Plasticity δ% | KCU J/cm³ |
|---|---|---|---|---|---|
| OT4-0 | 10 - 60 Д | Annealed | 490 - 637 | Over 45% | Over 70 |
| OT4-0 | 65 - 100 Д | -- "-- | 490 - 637 | Over 45% | Over 70% |
| OT4-0 | 101 - 150 П | -- "-- | 441 - 637 | Over 17% | Over 50 |
| OT4-0 | 140 - 250 П | -- "-- | 441 - 637 | More than 17% | Over 60 |
| OT4-0 | 140 - 250 Т | -- "-- | 441 - 637 | Over 17% | Over 70% |
| OT4-1 | 10 - 60 Д | -- "-- | 588 - 735 | More than 15% | Over 45 |
| OT4-1 | 65 - 100 Д | -- "-- | 588 - 735 | More than 15% | Over 45 |
| OT4-1 | 100 - 150 П | -- "-- | 539 - 735 | More than 12% | Over 40 |
| OT4-1 | 140 - 150 П | -- "-- | 539 - 735 | More than 12% | Over 40 |
| OT4-1 | 151 - 250 П | -- "-- | 539 - 735 | More than 12% | Over 45 |
| OT4-1 | Ø10 mm | -- "-- | 655 | 20 | 70 |
| Wire OT4-1 | Ø 1,0 - 1,4 | Annealing | Up to 785 | Over 7.5% | --- |
| OT4-1 wire | Ø 1,5 - 3,0 | Annealing | Up to 785 | Over 9% | --- |
| OT4-1 wire | Ø 3,5 - 7,0 | Annealing | Up to 785 | Over 12% | --- |
| OT4 bar | 10 - 60 Д | Annealing | 686 - 883 | More than 11% | Over 30 |
| OT4 bar | 65 - 100 Д | Annealing | 686 - 883 | Over 10% | Over 30 |
| -- "-- | 101 - 150 П | -- "-- | 637 - 883 | More than 8,5% | Over 35 |
| -- "-- | 140 - 250 П | -- "-- | 637 - 883 | More than 8,5% | Over 35 |
| -- "-- | 140 - 250 Т | -- "-- | 657 - 883 | Over 10% | Over 40% |
| -- "-- | Ø18 mm | Annealed at 700 °C 1 h. | 835 | 26 | 54 |
| OT4 bars calibrated | Annealed | 804 | 13,5 | --- | --- |
| OT4 bars calibrated | 1100°C+750°C 1 h. air | 745 | 15 | --- | --- |
| OT4 calibrated bars | 1100°C+1020°C, water +900°C 1 h. with furnace up to 650°C | 745 | 16 | --- | --- |
| Ot4 calibrated bars | Annealed at 800 °C 1 h. | 806 | 30 | 57 | --- |
E - longitudinal direction of rod cutting; P - transverse; T - elevation.
Deformable semi-finished products have more or less pronounced anisotropy of properties. Usually the tables indicate the properties of samples cut in the longitudinal direction. The hardening coefficient of a titanium alloy takes into account the effect of complex alloying due to the interaction of the alloying elements with each other. It increases from 1.18 for titanium to 1.32 for the complex alloyed grades as the number of components in the metal increases. For OT4-0, this coefficient = 1.23. OT titanium can be welded well with all types of welds.
Disadvantages
The tendency to hydrogen embrittlement, relatively low strength and heat resistance in comparison with other titanium grades. Production of semi-finished products of OT grade is referred to labor-intensive and expensive due to their relatively high resistance to cold deformation. In hot state titanium easily interacts with atmospheric gases, besides - poorly conducts heat, which creates large temperature gradients by the volume of processed metal. As a result, the cost of the finished product is much higher than the price of the initial raw material.
Application of
High structural efficiency, corrosion and erosion resistance and a number of other advantages determine the feasibility of using OT alloys in a wide range of applications. In mechanical engineering they are used for producing engine parts: valves, connecting rods, cam and crank shafts, bolts, transmission components (gears, shafts), clutch parts, valve springs and a number of other parts. For example, manufacturing connecting rods from titanium alloys allows to reduce the load on connecting rod bearings by 30%, which greatly increases their reliability and durability.
Supply
We supply certified OT grade titanium bars. Technical documentation includes data on percentage composition, maximum admixture fraction; mechanical properties. From us you can order in bulk any products for large-scale productions. We also provide optimum terms for retail buyers. The high level of service and responsiveness of service is the face of our company.
Buy at a favorable price
All titanium alloys sold by Evek GmbH comply with GOST and international quality standards. We supply rolled products of standard and non-standard sizes in the shortest terms. High quality, reasonable prices and wide range of products determine the face of our company. Becoming our regular client you can count on a system of discount discounts. Cooperation with us will help you to implement any projects.