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SP 17 Titan circle, rod, sheet
Characteristics of the alloy grade SP17
| Grade of titanium alloy: | SP17 |
|---|---|
| Classification of alloy: | Titanium alloys |
| Industrial application of alloy: | production of ingots, semi-finished products, titanium wire, rolled sections; details, details of instrument engineering and aviation |
Percentage composition of the brand SP17 according to GOST 19807- -91
| Fe | Mo | Si | N | O | Ti | Al | Zr | V | C | Impurities |
|---|---|---|---|---|---|---|---|---|---|---|
| to 0.25 | 1.8 — 3.5 | to 0.12 | to 0.04 | to 0.15 | basis | 3.5 to 4.5 | 2,0 | 2.5 to 3.5 | to 0.1 | Other 0.3 |
Note: the base of the alloy is titanium; the interest of its contents listed in the table.
Physical characteristics of the alloy grade SP17.
| Grad | W/(m·deg) | 1/Deg | kg/m3 | Ohm·m | J/(kg·deg) | MPa |
|---|---|---|---|---|---|---|
| T | 18.85 | r | R 109 | C | E 10-5 | |
| 100 | l | a 106 | 540 | |||
| 20 | 8.2 | 4505 | 1.12 |
The mechanical characteristics of the alloy grade SP17 (20°C).
| Assortment | Size | Eg. | KCU | y | blower SB | d5 | sT | Heat treatment. |
|---|---|---|---|---|---|---|---|---|
| - | mm | - | kJ / m2 | % | MPa | % | MPa | - |
| GOST 27265−87 | 480−625 | 15−18 |
Designations:
Mechanical characteristics:
| The yield stress at permanent deformation (thinning of proportionality), [MPa] | sT |
|---|---|
| Brinell hardness [MPa] | HB |
| The relative contraction [ % ] | y |
| Tensile strength (short-term) in [MPa] | blower SB |
| At break elongation in [ % ] | d5 |
| The toughness of the alloy, in [ kJ / m2] | KCU |
Weldability:
| not limited | — welding is carried out without further heat treatment and without heating |
|---|---|
| weldability with limitations | — welding is possible when heated to a temperature of 100−120°C and further heat treatment |
| hard-welded | — to obtain a quality weld, additional operations: during welding -preheating to a temperature of 200−300°C, heat treatment after welding — annealing |
Dignity
As to its strength titanium alloy SP-17 is not inferior to steel but lighter by almost half, are heat resistance, low thermal conductivity. Advantages of titanium is very promising in technical fields that require high specific strength, heat resistance, combined with high corrosion resistance. Food and chemical industry, aviation, shipbuilding, aerospace, vehicle construction today can not do without titanium. Unusual characteristics of this metal present a great interest as a structural material in spacecraft.
Alloying
Alloying increases the corrosion resistance of titanium and its strength properties 2−3 times. One of the main alloying elements are aluminium, present in almost all alloys of titanium. The most important alloying components, followed by aluminum are vanadium, molybdenum. High-temperature titanium alloys based on the ternary system — titanium-aluminum-molybdenum, high-strength titanium alloys of the system titanium-aluminum-vanadium. Most modern titanium alloys due to well-established trends multicomponent alloying at the same time in their composition contain aluminium, vanadium, molybdenum.
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