Steel 50Г23Х4ФВ7 (48ВННК-2)

Designation

Name	The value
Designation GOST Cyrillic	50Г23Х4ФВ7
Designation GOST Latin	50G23X4FB7
Transliteration	50G23H4FV7
By chemical elements	50Mn23Cr4VW7

Name	The value
Designation GOST Cyrillic	48ВННК-2
Designation GOST Latin	48BHHK-2
Transliteration	48VNNK-2
By chemical elements	48WННCo-2

Description

50Г23Х4ФВ7 steel is used: for the manufacture of forged and rolled round and square steel billets of open smelting and electroslag remelting (ESR); hull structures of ships, vessels and goods marine equipment (rotors, casings and other parts gyroscopic devices).

Note

Low high strength austenitic steel.
Magnetic permeability μ ≤ 1,002 GS/E.

Standards

Name	Code	Standards
Castings, non-ferrous metals and alloys	В84	RD 9257-76
Bars and shapes	В32	TU 14-1-214-72

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Fe	V	W
RD 9257-76	0.44-0.52	≤0.025	≤0.035	22-23	3-4.5	≤0.6	Rest	1.25-1.55	6.7-7.5

Fe is the basis.
According to RD 9257-76 the chemical composition is given for steel 50Г23Х4ФВ7 and 50Г23Х4ФВ7-Ш.

Mechanical properties

s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²
Steel 50Г23Х4ФВ7-sh. Without heat treatment. Bars hot rolled round 50-70 mm, round and square forged 100-150 mm
≥1080	≥1226	≥8	≥12	≥196
Steel 50Г23Х4ФВ7. Without heat treatment. Bars hot rolled round 30-70 mm, 100-150 mm forged round, forged square cross-section of 90-180 mm
≥1080	≥1226	≥5	≥8	-

Description mechanical marks

Name	Description
s_T\|s_0,2	Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σ_U	Limit short-term strength
d₅	Elongation after rupture
y	The relative narrowing
KCU	Toughness

Physical characteristics

Temperature	Е, HPa	r, kg/m³	l, W/(m · °C)	a, 10^-6 1/°C
20	181	8100	-	-
200	-	-	1717	-
300	-	-	1926	-
400	-	-	2177	-
100	-	-	-	1300

A description of the physical symbols

Name	Description
r	Density
l	Coefficient of thermal conductivity
R	UD. the resistivity