E⋅109
MPa
ρ
kgm3
σU
MPa
ϵL
ψ
KCU⋅103
Jm2

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
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, %
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

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Physical characteristics

Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\rho$ , $\frac{kg}{m^3}$
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
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
Rolling	Standard	Classifiers	Value, HBW
Alloy		annealing	207–285

Technological Properties

Weldability
Weldability
no limits

Analogues

China
China
TC-2

Standards

Standard	Description
Standard	Description
GOST 19807-91

Description of chemical elements

Element	Units of measurement	Description
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
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
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
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