1.3974 (X2CrNiMnMoNNb23-17-6-3)

Classification

Country	Section	Category
Germany	Alloy Miscellaneous Steels	Materials with Special Physical Properties and with Ni

Chemical composition

Standard	Fe, %	Si, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %	Nb, %	Mo, %	N, %
	45.735–55.8	< 1	4.5–6.5	21–24.5	15.5–18	< 0.025	< 0.03	< 0.01	0.1–0.3	2.8–3.4	0.3–0.5

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Physical characteristics

Temperature, °C	$$E\cdot 10^{9}$$, $$MPa$$	$$\alpha\cdot 10^{6}$$, $$K^{-1}$$	$$\rho$$, $$\frac{kg}{m^3}$$	$$R\cdot 10^{-6}$$, $$\Omega\cdot m$$
20	195		7900	0.9
100		15.5
200		16.6
300		17
400		17.3

Mechanical properties at 20 °C

Rolling	Standard	Size, mm	Tension	Classifiers	$$\sigma _{U}$$, $$MPa$$	$$\sigma_{0.2}$$, $$MPa$$	$$\epsilon_L$$, %	$$KU$$, $$J$$	Treatment
					800–1050	460–510	< 35	> 55	hardening

Standards

Standard	Description
SEW390
WW

Description of chemical elements

Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
Mn	%	Manganese
Cr	%	Chrome
Ni	%	Nickel
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
Nb	%	Niobium
Mo	%	Molybdenum
N	%	Nitrogen

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)
$$\rho$$	$$\frac{kg}{m^3}$$	The density of the material
$$R\cdot 10^{-6}$$	$$\Omega\cdot m$$	Electrical resistivity

Description of mechanical properties

Parameter	Units of measurement	Description
$$\sigma_{0.2}$$	$$MPa$$	Tensile stress required to produce a total elongation of 0.2%
$$\sigma _{U}$$	$$MPa$$	Ultimate tensile strength
$$\epsilon_L$$	%	Elongation at break (longitudinal)
$$KU$$	$$J$$	Impact energy