17H18N9 (2X18H9)

cold-rolled sheet and strip for increased strength of various parts and structures to be welded by spot welding, as well as for products subjected to spot welding; austenitic steel

Classification

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

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ti, %	Cu, %	Ni, %	P, %	C, %	S, %
Standard	Fe, %	Si, %	Mn, %	Cr, %	Ti, %	Cu, %	Ni, %	P, %	C, %	S, %
GOST 5632-72	68.935–74.87	< 0.8	< 0.2	17–19	< 0.5	< 0.3	8–10	< 0.035	0.13–0.21	< 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	199		18	7900		0.72
100		16	19		0.504	0.735
200		17	20			0.855
300		17.5	21			0.925
400		17.9	22			0.975
500		18.5	24			1.031
600		18.6	25			1.08
700	147	18.9	26			1.115
800		19.1	27			1.15
900		19.3	28			1.185
1000		19.5

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				568		40
Pipes are coldly deformed.	GOST 9941-81				568		35
Rod	GOST 5949-75	< 60			570	215	40	55	Hardening of 1050-1100 ° C, air cooling
The bar is hardened.	GOST 18907-73				880–930
Bar of specified strength	GOST 18907-73				590–880		20
The plates	GOST 7350-77				590	265	35		Hardening of 1080-1120 ° C, cooling water
Sheet	GOST 4986-79				570		17–34		Hardening of 1050-1080 ° C, air
Sheet thin is half-worked.	GOST 5582-75				740–930		25
Sheet	GOST 5582-75				590		35		Hardening of 1050-1080 ° C, cooling water
The sheet is thin and hardened.	GOST 5582-75				980–1230		13
The sheet is thin and hardened.	GOST 4986-79				980		3–5

Analogues

Germany	USA
Germany	USA
X12CrNi18-8	S30200

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
Ti	%	Titan
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