Alloy НМКЖМц30-4-2-1 (VCR)

Designation

Name	The value
Name	The value
Designation GOST Cyrillic	НМКЖМц30-4-2-1
Designation GOST Latin	HMKZhMts30-4-2-1
Transliteration	NMKGMts30-4-2-1
By chemical elements	NiCuCoFeMn30-4-2-1

Name	The value
Name	The value
Designation GOST Cyrillic	ВКМ
Designation GOST Latin	BKM
Transliteration	VKM
By chemical elements	ВCoCu

Description

Alloy НМКЖМц30−4-2−1 used: for the manufacture of cast billets, cast, sand casting, gravity die casting and investment casting used in the manufacture of parts of friction.

Standards

Name	Code	Standards
Name	Code	Standards
Castings, non-ferrous metals and alloys	В84	OST 1 90230-76

Chemical composition

Standard	C	S	P	Mn	Si	Ni	Fe	Cu	Sb	Pb	Bi	Mg
Standard	C	S	P	Mn	Si	Ni	Fe	Cu	Sb	Pb	Bi	Mg
OST 1 90230-76	≤0.1	≤0.015	≤0.01	0.5-1.5	3.9-4.3	Rest	1.5-2.8	30-32	≤0.01	≤0.05	≤0.01	≤0.1

Ni is the basis.
According to OST 1 90230-76, the total content of other impurities (not indicated) should be ≤ 0.30%, the content of each other impurity should be ≤ 0.010%. The total amount of impurities (regulated and other) should be ≤ 0.60%. The deviation of the silicon content within ± 0.10% is allowed, provided that the mechanical properties are observed. In the case of deoxidation of the alloy with titanium, its content is allowed up to 0.15%.

Mechanical properties

σ_U, MPa	d₅, %	HB, MPa
σ_U, MPa	d₅, %	HB, MPa
Cast billet supplied according to OST 1 90230-76
≥687	≥1	≥300
≥785	≥2	≥350

Description mechanical marks

Name	Description
Name	Description
σ_U	Limit short-term strength
d₅	Elongation after rupture
HB	Brinell hardness number

Technological properties

Name	The value
Name	The value
Macrostructure and pollution	In the macrostructure of a longitudinal section casting blank OST 1 90230-76 determined on the macrosections or fractures, are not allowed clogging, non-metallic inclusions. Allowed individual gas shell in an amount of not more than 5 pieces with a diameter of not more than 1 mm each, provided the distance between them not less than 10 mm. is Also permitted total porosity, if it does not exceed 10 pores per 1sm2 surface macrolife with a pore diameter of 0.1 mm to 80% and pore diameter up to 0.2 mm is 20% and zonal porosity, if it does not exceed 15 pores per 1 cm2 of the surface of Microlife with pore diameters up to 0.3 mm - 80% and a pore diameter of 0.5 mm - 20%.
Microstructure	The microstructure of cast billets at OST 1 90230-76 must meet the requirements agreed between the supplier and the consumer.
Casting	The surface of the casting blank OST 1 90230-76 should be clean without svertysha, Nikitin, cracks and foreign inclusions. On the surface of casting blanks allowed shell and other minor defects, provided the depth does not display casting-billet beyond the allowance for machining. Casting-billet after trimming the profitable parts should not have a gaseous porosity of the centering rychlosti. Allowed the presence of a small Central rychlosti if it does not display the casting of the billet beyond the allowance for machining. The zonal area of porosity shall not exceed 20% of controlled surface. The monitored area should be located in the area of the finished part.