OT4-1

Hardness OT4−1HB 10 ^-1 = 197 — 255 MPa. Weldability without restrictions.

Thin-walled parts of complex configurations, working continuously at 300 ° C (3000 h) and 350 ° C (2,000 hours); class structure pseudo α; Disadvantages — relatively low strength; very high propensity to hydrogen embrittlement

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	0.7–2	94.33–97.5	< 0.3	1.5–2.5	< 0.1	< 0.15	< 0.05	< 0.012	< 0.3

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Physical characteristics

Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	$c\cdot 10^{-3}$ , $\frac{J}{kg\cdot K}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$
Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	$c\cdot 10^{-3}$ , $\frac{J}{kg\cdot K}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$
20	110		9.63	4550		1.01
100		8	10.47
200		8	11.3		0.565
300		9.1	12.14		0.628
400		9.6	14.24		0.67
500		9.7	14.65		0.754
600		9.8	16.32

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	590	13–25
Round	GOST 26492-85	10–150			540	10–12	21–30	400–450
Round	GOST 26492-85			enhanced quality	540–735	13–15	24–35	400–450
Plate	GOST 23755-79	11–150			590–735	8–10	14–18

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Rolling	Standard	Classifiers	Value, HBW
			197–255

Technological Properties

Weldability
Weldability
no limits

Analogues

Japan	China
Japan	China
ST-A90	TC-1

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
$\alpha\cdot 10^{6}$	$K^{-1}$	Coefficient of thermal (linear) expansion (range 20°C–T)
$\varkappa$	$\frac{W}{m\cdot K}$	Coefficient of thermal conductivity (the heat capacity of the material)
$\rho$	$\frac{kg}{m^3}$	The density of the material
$c\cdot 10^{-3}$	$\frac{J}{kg\cdot K}$	The specific heat of the material (range 20°C–T)
$R\cdot 10^{-6}$	$\Omega\cdot m$	Electrical resistivity

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