12H18N12T (H18N12T)

various parts operating at temperatures from -196 to 600 ° C in harsh environments

Classification

Country	Section	Category
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, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Cu, %	Ni, %	P, %	C, %	S, %
GOST 5632-72	64.725–72	< 0.8	< 2	17–19	< 0.3	11–13	< 0.035	< 0.12	< 0.02

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Physical characteristics

Temperature, °C	$E\cdot 10^{9}$ , $MPa$	$\alpha\cdot 10^{6}$ , $K^{-1}$	$\varkappa$ , $\frac{W}{m\cdot K}$	$\rho$ , $\frac{kg}{m^3}$	$c\cdot 10^{-3}$ , $\frac{J}{kg\cdot K}$	$R\cdot 10^{-6}$ , $\Omega\cdot m$
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	205		15.1	7900		0.761
100	202	16.6	16.3	7860	0.46	0.8
200	197	17	17.6	7820	0.482	0.865
300	190	17.2	18.7	7780	0.507	0.93
400	181	17.5	20.4	7740	0.525	0.982
500	173	17.9	22.2	7690	0.545	1.038
600	160	18.2	24.1	7650	0.563	1.07
700	150	18.6	25.9	7600	0.579	1.12
800		18.9	27.4	7560	0.59	1.155
900		19.3	29.1	7510	0.603	1.21
1000			30.8		0.616	1.245
1100			32.3		0.625	1.275
1200			34.1		0.637	1.315

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	Treatment
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\sigma_{P}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	Treatment
Pipes are hot deformed.	GOST 9940-81				529		40
Trumpet			Longitudinal		540	220	35	55	Heating of 1050-1100 ° C, cooling water
Pipes are coldly deformed.	GOST 9941-81				549		35
Rod	GOST 5949-75				540	196	40	55	Hardening of 1020-1100 ° C, cooling water
The plates	GOST 7350-77				530	235	38		Hardening of 1030-1080 ° C, cooling water

Technological Properties

Weldability
Weldability
Boundedly welded

Analogues

Germany
Germany
1.4878 (X12CrNiTi18-9)

Standards

Standard	Description
Standard	Description
GOST 5632-72

Description of chemical elements

Element	Units of measurement	Description
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
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
$\sigma_{P}$	$MPa$	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
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