Steel 16Х2Н3МФБАЮ (16Х2Н3МФАБ; ВКС7)
|Designation GOST Cyrillic||16Х2Н3МФБАЮ|
|Designation GOST Latin||16X2H3MFBAJu|
|By chemical elements||16Cr2Н3MoVNbNAl|
|Designation GOST Cyrillic||16Х2Н3МФАБ|
|Designation GOST Latin||16X2H3MFAB|
|By chemical elements||16Cr2Н3MoVNNb|
|Designation GOST Cyrillic||ВКС7|
|Designation GOST Latin||BKC7|
|By chemical elements||WCoС7|
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.
Alloyed construction steel of the martensitic class.
Case hardening steel hardening chemical-thermal treatment.
|Classification, nomenclature and General rules||В20||OST 1 90005-91|
|Bars and shapes||В32||TU 14-1-4483-88|
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%.
|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|
|Bars hot rolled on the other 14-1-4483-88. Quenching in oil from 860±10 °C + Vacation at 200±10 °C, air cooling|
Description mechanical marks
|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|
|HB||Brinell hardness number|
|HRC||Rockwell hardness (indenter diamond spheroconical)|
|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).|