Medium carbon structural stainless steel 20H21N46V8RL for the production of castings

Chemical composition

B	Boron	<0.06
W	Tungsten	7.0 — 9.0
Fe	Iron	Rest
Si	Silicon	0.2 — 0.8
Mn	Manganese	0.3 — 0.8
Ni	Nickel	43.0 — 48.0
S	Sulfur	<0.035
C	Carbon	0.10 — 0.25
P	Phosphorus	<0.04
Cr	Chromium	19.0 — 22.0

engine parts for the aviation industry; austenitic steel grade. In Russia, produced in accordance with the requirements of GOST 977−88

Classification

Country	Section	Category
Country	Section	Category
CIS, Russia, Ukraine	Steels and alloys for castings	Steel for casting with special properties

Chemical composition

Standard	Fe, %	Si, %	B, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %	W, %
Standard	Fe, %	Si, %	B, %	Mn, %	Cr, %	Ni, %	P, %	C, %	S, %	W, %
GOST 977-88	19.015–30.4	0.2–0.8	< 0.06	0.3–0.8	19–22	43–48	< 0.04	0.1–0.25	< 0.035	7–9

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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
Rolling	Standard	Size, mm	Tension	Classifiers	$\sigma _{U}$ , $MPa$	$\epsilon_L$ , %	$\psi$ , %	$KCU\cdot 10^{3}$ , $\frac{J}{m^2}$	Treatment
Castings	GOST 977-88				441	6	8	294

Heat Treatment Modes

Treatment
Treatment
Aging 890 - 910 ° C, 5 h., Air cooling

Standards

Standard	Description
Standard	Description
GOST 977-88

Description of chemical elements

Element	Units of measurement	Description
Element	Units of measurement	Description
Fe	%	Iron
Si	%	Silicon
B	%	Bor
Mn	%	Manganese
Cr	%	Chrome
Ni	%	Nickel
P	%	Phosphorus
C	%	Carbon
S	%	Sulfur
W	%	Tungsten

Description of mechanical properties

Parameter	Units of measurement	Description
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