Steel 16Х2Н3МФБАЮ (16Х2Н3МФАБ; ВКС7)

Designation

Name The value
Designation GOST Cyrillic 16Х2Н3МФБАЮ
Designation GOST Latin 16X2H3MFBAJu
Transliteration 16H2N3MFBAYu
By chemical elements 16Cr2Н3MoVNbNAl
Name The value
Designation GOST Cyrillic 16Х2Н3МФАБ
Designation GOST Latin 16X2H3MFAB
Transliteration 16H2N3MFAB
By chemical elements 16Cr2Н3MoVNNb
Name The value
Designation GOST Cyrillic ВКС7
Designation GOST Latin BKC7
Transliteration VKS7
By chemical elements WCoС7

Description

16Х2Н3МФБАЮ steel is used: for the manufacture of forgings of various parts of the aviation and transport machine-building; heavy duty gears; nitride of parts for the aircraft industry.

Note

Alloyed construction steel of the martensitic class.
Case hardening steel hardening chemical-thermal treatment.

Standards

Name Code Standards
Classification, nomenclature and General rules В20 OST 1 90005-91
Bars and shapes В32 TU 14-1-4483-88

Chemical composition

Standard C S P Mn Cr Si Ni Fe N V Mo Nb
TU 14-1-4483-88 0.14-0.18 ≤0.015 ≤0.025 0.3-0.6 1.8-2.2 0.17-0.37 2.7-3 Rest 0.01-0.03 0.1-0.3 0.4-0.6 0.05-0.15
Fe is the basis.
According to TU 14-1-4483-88 the chemical composition is given for steel grade 16Х2Н3МФАБ-Ш (ВКС7-Ш). Deviations in the mass fraction of elements are permissible in accordance with clause 2.4 of Table 3 of GOST 4543. Titanium in an amount not exceeding 0.050% is introduced into steel by calculation and chemical analysis is not determined. The mass fraction of copper should not exceed 0.25%, tungsten - 0.20%. The mass fraction of aluminum in the metal of the ESR should not exceed 0.050%.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HB, MPa HRC
Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91
- - 1040-1270 - - - 302-363 33-39
- - - - - - 321-429 33-42.5
- - - - - - 302-388 28-39
Bars hot rolled on the other 14-1-4483-88. Quenching in oil from 860±10 °C + Vacation at 200±10 °C, air cooling
≥1080 ≥1270 ≥9 ≥45 ≥490 302-415 -

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU 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 The macrostructure of the steel on the other 14-1-4483-88 when checking in the fracture and lateral etched templeto should not have voids, traces of shrinkage, blistering, delamination, cracks, foreign metal and slag inclusions and placenow and defects of fracture, as listed in Annex 4 to GOST 10243. The degree of development of the Central porosity, point heterogeneity and phase separation of the square should not exceed the first score of the scales GOST 10243, layer-by-layer crystallization and light strip (circuit) - the third-score scales GOST 10243.
Microstructure In hot-rolled steel on the other 14-1-4483-88 is the determination of the austenitic grain size, which should not be larger than 6 dial numbers according to GOST 5639.
Particularities of production of goods Hot rolled steel on the other 14-1-4483-88 designed for cold machining, comes in heat-treated (annealed with a temperature of 670±20 °C) hardness Brinell indentation diameter not less than 3.5 mm. Steel for hot forming (forging, stamping, etc.) is supplied in heat-treated (annealed with a temperature of 800-900 °C).