Alloy В3К

Designation

Name	The value
Designation GOST Cyrillic	В3К
Designation GOST Latin	B3K
Transliteration	V3K
By chemical elements	В3

Description

Alloy В3К used: for the production of cast bars used for welding gas flame valves of internal combustion engines and other parts with similar requirements and casting of other parts of the aircraft.

Note

The heat-resistant cast alloy on cobalt basis.

Standards

Name	Code	Standards
Bars	В55	OST 1 90078-72
Non-ferrous metals, including rare, and their alloys	В51	OST 1 90127-85

Chemical composition

Standard	C	S	Cr	Si	Ni	Fe	W	Co
OST 1 90127-85	1-1.3	≤0.07	28-32	2-2.75	≤2	≤2	4-5	Rest
OST 1 90078-72	1-1.3	≤0.07	28-32	2-2.75	≤2	≤2	4-5	58-63

Co is the basis.
According to OST 1 90078-72, nickel and cobalt are determined by difference. In the alloy, the molybdenum content is allowed up to 2.0%.
According to OST 1 90127-85 the chemical composition is given for the alloy B3K. In the alloy, the mass fraction of molybdenum is allowed up to 2.0%.

Mechanical properties

HRC
Alloy rods according to OST 1 90078-72
40-50

Description mechanical marks

Name	Description
HRC	Rockwell hardness (indenter diamond spheroconical)

Technological properties

Name	The value
Macrostructure and pollution	According to OST 1 90078-72 on the surface of the bars should be free of sand and slag inclusions. Local minor defects should be removed by Stripping. The color of a tint on the surface of bars and shrinkage bars inside rejection symptom are not.