OT4

The hardness of the annealed alloy OT4 HB 10 -1 = 207 — 285 MPa. Unlimited weldability

for components operating at temperatures up to 350 ° C for 2000 hours and to 300 ° C — 30,000 hr .; good corrosion resistance; class structure pseudo α

Classification

Country Section Category
CIS, Russia, Ukraine Titanium, titanium alloys Wrought Titanium Alloys

Chemical composition

Standard Fe, % Si, % Mn, % Ti, % Zr, % Al, % C, % O, % N, % H, % Примеси, %
GOST 19807-91 < 0.3 < 0.12 0.8–2 91.83–95.4 < 0.3 3.5–5 < 0.1 < 0.15 < 0.05 < 0.012 < 0.3

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\rho$$, $$\frac{kg}{m^3}$$
20 115 4550

Mechanical properties at 20 °C

Rolling Standard Size, mm Tension Classifiers $$\sigma _{U}$$, $$MPa$$ $$\epsilon_L$$, % $$\psi$$, % $$KCU\cdot 10^{3}$$, $$\frac{J}{m^2}$$ Treatment
Sheet GOST 22178-76 annealing 685 10–20
Round GOST 26492-85 635–685 8 20–25 350–400
Round GOST 26492-85 enhanced quality 635–885 9–11 21–30 350–400
Plate GOST 23755-79 11–150 685–885 6–8 10–15

Brinell hardness number

Rolling Standard Classifiers Value, HBW
Alloy annealing 207–285

Technological Properties

Weldability
no limits

Analogues

China
TC-2

Standards

Standard Description
GOST 19807-91

Description of chemical elements

Element Units of measurement Description
Fe % Iron
Примеси % Impurities
Si % Silicon
Mn % Manganese
Ti % Titan
Zr % Zirconium
Al % Aluminium
C % Carbon
O % Oxygen
N % Nitrogen
H % Hydrogen

Description of physical characteristics

Parameter Units of measurement Description
$$E\cdot 10^{9}$$ $$MPa$$ Elastic modulus
$$\rho$$ $$\frac{kg}{m^3}$$ The density of the material

Description of mechanical properties

Parameter Units of measurement Description
$$\sigma _{U}$$ $$MPa$$ Ultimate tensile strength
$$\epsilon_L$$ % Elongation at break (longitudinal)
$$\psi$$ % Reduction in cross section on fracture
$$KCU\cdot 10^{3}$$ $$\frac{J}{m^2}$$ Impact toughness

Designation of types of weldability

Parameter Units of measurement Description
no limits Welding is performed without heating and without subsequent heat treatment
Boundedly welded Welding is possible with heating up to 100–120 °C and subsequent heat treatment
Difficult to weld For obtaining quality welded joints, additional operations are required: heating up to 200–300 °C for welding, heat treatment after welding — annealing
Not applicable for welded structures