40ХН2ВА steel is used: for the manufacture of crankshafts, responsible, bolts, and other fasteners, special fasteners and other heavy duty parts; nitride parts of aviation.

Note

Structural steel high-quality chronicloperamide.

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 14-1-1885-85, 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	0.37-0.44	≤0.025	≤0.025	0.5-0.8	0.6-0.9	0.17-0.37	1.25-1.65	Rest	≤0.25	≤0.05	≤0.03	≤0.15	0.8-1.2

Fe is the basis.
According to TU 14-1-1885-85 the chemical composition is given for steel grade 40ХН2ВА-ВД. To ensure the required grain size, it is allowed to introduce vanadium in the steel smelting at the rate of its content in steel no more than 0.10%, the content of which in steel is not determined. The presence of molybdenum up to 0.15%, titanium up to 0.030% is not a defective feature. In the steel, a partial replacement of tungsten with residual molybdenum is allowed from the calculation: one part by weight of molybdenum replaces three parts by weight of tungsten, while the content of tungsten in steel should be at least 0.50%.

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
-	-	-	-	-	-	285-341	27-36
Bars and strip hot rolled and forged. Quenching in oil with 835-865 °C + vacation at 570-670 °C, cooling in water or oil
	≥835	≥980	≥12	≥55	≥980	294-341	-
Bars of steel grade 40ХН2ВА (40ХНВА) TU 14-1-1885-85. Quenching in oil 840-860 °C + Vacation at 570-670 °C, air cooling. In the graph KCU KCU values are shown along the fiber/KCU across the grain
Образец 25х25	≥835	≥980	≥12	≥55	≥981/588	293-341	-
Образец 25х25	≥930	≥1080	≥12	≥50	≥784/490	320-374	-

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)

Technological properties

Name	The value
Macrostructure and pollution	Macrostructure of steel when testing for the breaks in the longitudinal direction and transverse templeto selected from rolled, should not have shrinkage, porosity, bubbles, cracks, delamination, inclusions and placenow and defects of fracture, listed in Annex 3 GOST 10243. The Central porosity, point heterogeneity and phase separation in the square should not exceed 1 points; layer-by-layer crystallization and the bright loop - 3 points reference scales GOST 10243. All other defects under GOST 10243, are not allowed. Pollution steel non-metallic inclusions should be according to the average score is not higher (in points): oxides of point 1,5, 2,0 stroke oxides, silicates fragile 1,0, 1,0 silicates plastic, silicates, non-deformed 2,5, 2,5 sulfides, nitrides stroke and point 1,0.

Steel 40ХН2ВА (40ХНВА)

Designation

Description