OT4-0

Sheet hardness OT4−0 HB 10 ^-1 = 200 MPa. The hardness of the rod OT4−0 HB 10 ^-1 = 156 — 207 MPa. Weldability without restrictions.

parts of complex configuration, long operating at temperatures 300−350 ° C and briefly at a temperature of 500−600 ° C; 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, %	OE, %
Standard	Fe, %	Si, %	Mn, %	Ti, %	Zr, %	Al, %	C, %	O, %	N, %	H, %	OE, %
GOST 19807-91	< 0.3	< 0.12	0.5–1.3	96.13–98.8	< 0.3	0.4–1.4	< 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	4514

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	470	20–30
Trumpet	GOST 24890-81				490–637	15
Round	GOST 26492-85				440	13–15	30–35	400–500
Round	GOST 26492-85			enhanced quality	440–635	20	32–40	500–700
Plate	GOST 23755-79	11–150			490–635	10–12	18

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
Sheet			200
Round			156–207

Technological Properties

Weldability
Weldability
no limits

Analogues

Russia
Russia
Т4 ГОСТ 2171-90

Standards

Standard	Description
Standard	Description
GOST 19807-91

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
OE	%	Other items
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