12X18H9T (X18H9T)

Springs for t-p up to 300 ° C, as well as sheets with high strength for transport, muffles of thermal furnaces, parts for fixing heat exchangers, walking furnaces, casings, supports up to 800 degrees. 7920kg / m3

Welded equipment, pipes, fittings furnace parts, heat exchangers, muffles, parts of exhaust systems, flat and long parts. Apparatus and vessels operating at temperatures from -196 to 600 ° C under pressure and in the presence of corrosive media to 350 ° C .; austenitic steel

Classification

Country	Section	Category
CIS, Russia, Ukraine	Corrosion-resistant alloys and steels	Corrosion-resistant heat-resistant steel

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	P, %	C, %	S, %
GOST 5632-72	68.225–75	< 0.8	< 2	17–19	< 0.3	8–9.5	< 0.035	< 0.12	< 0.02

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Physical characteristics

Temperature, °C	$$E\cdot 10^{9}$$, $$MPa$$	$$\alpha\cdot 10^{6}$$, $$K^{-1}$$	$$\varkappa$$, $$\frac{W}{m\cdot K}$$	$$\rho$$, $$\frac{kg}{m^3}$$	$$c\cdot 10^{-3}$$, $$\frac{J}{kg\cdot K}$$	$$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
20	195			7900		0.725
100	189	16.6	16	7860	0.469	0.792
200	182	17	18	7820	0.486	0.861
300	175	17.6	20	7780	0.498	0.92
400	167	18	21	7740	0.511	0.976
500		18.3	23	7690	0.519	1.028
600	153	18.6	25	7650	0.528	1.075
700	143	18.9	26	7600	0.532	1.117
800	135	19.3	28	7560	0.544	1.149
900		19.5	29	7510	0.548	1.176
1000		20.1

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	$$\sigma _{U}$$, $$MPa$$	$$\sigma_{P}$$, $$MPa$$	$$\epsilon_L$$, %	$$\psi$$, %	Treatment
Rod	GOST 5949-75	< 60	540	196	40	55	Hardening of 1020-1100 ° C, air cooling
The bar is hardened.	GOST 18907-73		880–930
Wire	GOST 18143-72		590–880		20–25
Forgings	GOST 25054-81	< 1000	510	196	35–40	40–48	Hardening of 1050-1100 ° C
The plates	GOST 7350-77		530	215	38		Hardening of 1030-1080 ° C, cooling water

Brinell hardness number

Rolling	Standard	Classifiers	Value, HBW
Forgings	GOST 25054-81		1700

Technological Properties

Weldability
no limits

Analogues

Germany	USA
X10CrNiTi18-9	321

Standards

Standard	Description
GOST 5632-72
GOST 5949-75
GOST 5582-75
GOST 7350-77
GOST 4986-79
GOST 9940-81
GOST 9941-81
TU 14-1-377-72
TU 14-1-565-84
TU 14-1-416-72

Description of chemical elements

Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Cr	%	Chrome
Cu	%	Copper
Ni	%	Nickel
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur

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
$$\sigma_{P}$$	$$MPa$$	Proportionality limit
$$\epsilon_L$$	%	Elongation at break (longitudinal)
$$\psi$$	%	Reduction in cross section on fracture

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