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
CIS, Russia, Ukraine Titanium, titanium alloys Wrought Titanium Alloys

Chemical composition

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

Information on suppliers

Physical characteristics

Temperature, °C $$E\cdot 10^{9}$$, $$MPa$$ $$\alpha\cdot 10^{6}$$, $$K^{-1}$$ $$\varkappa$$, $$\frac{W}{m\cdot K}$$ $$\rho$$, $$\frac{kg}{m^3}$$ $$c\cdot 10^{-3}$$, $$\frac{J}{kg\cdot K}$$ $$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
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
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
197–255

Technological Properties

Weldability
no limits

Analogues

Japan China
ST-A90 TC-1

Standards

Standard Description
GOST 19807-91

Description of chemical elements

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
$$E\cdot 10^{9}$$ $$MPa$$ 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
$$\sigma _{U}$$ $$MPa$$ 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