Steel 30Х3ВА

Designation

Name	The value
Designation GOST Cyrillic	30Х3ВА
Designation GOST Latin	30X3BA
Transliteration	30H3VA
By chemical elements	30Cr3W

Description

30Х3ВА steel is used: for the manufacture of load-bearing parts of rocket engines, including nitride, operating at temperatures up to 400−500 °C; nitride parts of aviation.

Note

Nitriding the steel is held at a temperature of 500−525 °C when the dissociation of ammonia 15−30%.

Standards

Name	Code	Standards
Classification, nomenclature and General rules	В20	OST 1 90005-91
Blanks. Of the workpiece. Slabs	В31	TU 1-92-156-90
Bars and shapes	В32	TU 14-1-950-74

Chemical composition

Standard	C	S	P	Mn	Cr	Si	Ni	Fe	Cu	V	Ti	Mo	W
TU 14-1-950-74	0.27-0.35	≤0.025	≤0.025	0.3-0.6	2.8-3.2	0.17-0.37	≤0.5	Rest	≤0.25	≤0.05	≤0.03	≤0.15	0.8-1.2

Fe is the basis.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %	y, %	KCU, kJ/m²	HB, MPa	HRC
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
-	-	-	-	-	-	302-363	28-37
Bars and strip hot rolled and forged. Quenching in oil or warm water with 870-890 °C + vacation at 580-620 °C, air cooling
	≥835	≥980	≥15	≥50	≥980	302-341	-

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
HB	Brinell hardness number
HRC	Rockwell hardness (indenter diamond spheroconical)