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Titanium alloy

Technical Characteristics

Although the mechanical strength of titanium at normal temperature is quite high, but with increasing temperature up to 250 °C strength is lost by almost half. The situation is saved by titanium alloys, in which this drawback is leveled. Titanium is notable for its remarkable corrosion resistance. Corrosion resistance is evaluated by the amount of loss from 1 square metre of surface.

Corrosion Resistance Loss weight per square metre Rating in points
Extremely resistant Less than 0,001 g 1
Highly persistent 0,001 - 0,005 2
0,005 - 0,01 г 3
Persistent 0,01 - 0,05 г 4
0,05 - 0,1 г 5
Satisfactorily persistent 0,1 - 0,3 г 6
Slightly resistant 0,3 - 1,0 г 7
1 - 5,0 г 8
Unstable More than 5 g. 9

Comparative tests of corrosion resistance in industrial and marine atmospheres revealed that aluminum alloys, stainless steels, copper-nickel alloys and Inconel alloy showed visible signs of corrosion over a five-year period, while the titanium plate did not lose its original luster. This corrosion resistance is due to the presence of a passive oxide film on the metal surface that protects the metal from contact with an aggressive agent.

Titanium is particularly resistant to corrosion in the presence of oxygen. For example, under conditions of air aeration, titanium practically does not corrode in formic acid in any concentration up to a temperature of 100 °C, whereas without aeration it quickly corrodes in a 25% solution of formic acid.

TITAN Alloys

Titanium alloys are characterized by their precise chemical composition, careful manufacturing, and absence of impurities. Titanium alloys are classified as:

α-alloys Pseudo-α-alloys α +β alloys Pseudo-β alloys β-alloys
BT1 OT4 VT-6 VT16 4201
VT1-0 OT4-0 VT3-1 VS-6
VT1-00 OT4-1 VT-14
VT5 OT4-2 VT-16
VT5-1 AT-2 BT-22
4200 AT-3
AT-4
BT20

TITAN alloys annealing modes

Titanium grade Temperatures of annealing of sheet products Annealing temperature of bars Annealing mode
VT1-00 520 - 540 670 - 690 ---
VT1-0 520 - 540 670 - 690 ---
VT5 --- 800 - 850 ---
VT5-1 700 - 750 800 - 850 ---
OT4-0 590 - 610 690 - 710 ---
OT4-1 640 - 660 740 - 760 ---
OT4 660 - 680 700 - 760 ---
OT4-2 700 - 730 840 - 860 ---
VT20 700 - 800 700 - 800 ---
AT2 600 - 650 650 - 700 ---
AT3 800 - 850 800 - 850 ---
AT4 850 - 870 850 - 870 ---
TS5 760 - 780 760 - 780 ---
VT6C 750 - 800 750 - 800 ---
VT6 750 - 800 750 - 800 ---
VT3-1 ---

870 - 920

600 - 650

Isothermal annealing: heating to 870-920°C, holding time, cooling to 600-650°C Transfer to another furnace, holding time 2 hours, cooling in air
VT3-1 ---

870 - 920

650 - 600

Double annealing, soaking at 550 - 600°C for 2-5 hours. For power parts - annealing at 650 °C air cooling.
VT14 740-760 790-810 640-600 740-760 790-810 640-660 Isothermal annealing: heating to 790-810°C, holding time, cooling with furnace, transfer to another furnace to 640-660°C, holding time ½ hour, air cooling
VT16 730 - 770 770 - 790 Cooling with furnace at a rate of 2 to 4°C per minute to 550°C, air cooled
VT22 740 - 760 680 - 800 Furnace batch cooling at 2 - 4 °C/ minute, up to 350 °C, air cooled
VT15 790 - 810 790 - 810 ---
TS6 790 - 810 790 - 810 ---
BT23 740 - 750 740 - 750 ---

TITAN hardening alphasing, nitriding, carbideization

When heat treating titanium, a so called alphiated layer is formed on the surface of semi-finished products because of active interaction of hot titanium with oxygen and nitrogen

Alloy grade Oxygen content in the altered layer mg/cm2 Depth of alphinated layer (mm)
WT-1 2,8 0,8
OT-4 1,5 0,2
VT3-1 2,5 0,6
ВТ-5 4,2 2,0
ВТ-6 2,2 0,6
VT-9 cast 7,3 0,8
Alloy grade Nitriding depth Surface hardness kgf/mm2
WT-1 0,06 - 0,08 750 - 850
VT3-1 0,04 - 0,05 700 - 750
VT-5 0,08 - 0,1 750 - 800
VT-8 0,12 - 0,14 700 - 750
VT-14 0,14 - 0,16 750 - 850

Nitriding of titanium alloys

Nitriding increases heat and especially wear resistance and resistance to abrasion. The most widely employed method of nitriding is the heating of semi-finished products in an atmosphere of pure nitrogen to a temperature of 850 to 950°C. If the alloy contains aluminum or zirconium, speed and depth of nitriding increase, depth - up to 0.2 mm.

Carbidization (cementation) is an effective method of hardening titanium alloys. It is carried out in a mixture with activated carbon in a vacuum or in an atmosphere of a mixture of argon 5% carbon monoxide, methane or propane... Processing in an atmosphere of a gas mixture leads to saturation with hydrogen, which reduces the plasticity of titanium. Processing with charcoal takes 24 to 48 hours but leads to deeper carbideization

TITAN SPonge

Chemical composition of sponge titanium obtained by reduction from Ti Cl4 by various methods

Element Vacuum separation Magnesium with salt leaching Sodium with salt leaching
N 0,015 0,015 0,1
H 0,005 --- 0,05
Fe 0,12 0,1 0,06
C 0,02 0,025 0,02
Cl 0,12 0,2 0,2
Mg 0,08 0,05 ---
O 0,1 0,1 0,1

It is characterized by the accuracy of composition, thoroughness of manufacturing and processing, the absence of impurities.

Supplier

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Buy, favorable price.

Auremo" company offers to buy titanium on favorable terms. The widest range of products for large-scale production is represented in stock. We have attractive terms for retail buyers as well. Titanium is always available, the price - due to the technological features of production without including additional costs. All products are certified. Optimal price from the supplier. Buy titanium today. We are waiting for your orders. We have the best price-quality ratio for the whole range of products.

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