Alloy MA12

Designation

Name	The value
Designation GOST Cyrillic	МА12
Designation GOST Latin	MA12
Transliteration	MA12
By chemical elements	CuAl12

Description

Alloy MA12 is used: for the manufacture of semi-finished products (sheets, plates, rods, sheets, tubes, wire, stampings and forgings) by hot deformation; extruded sections with cross sectional area up to 12 cm² and a diameter of the circumscribed circle of up to 150 mm; ingots and slabs for the manufacture of the parts, the heating in the process of operation with maximum operating temperature up to +250 °C — long, up to +300 °C short — term.

Standards

Name	Code	Standards
Bars and shapes	В52	GOST 13616-97, GOST 13617-97, GOST 13618-97, GOST 13619-97, GOST 13620-90, GOST 13621-90, GOST 13622-91, GOST 13623-90, GOST 13624-90, GOST 13737-90, GOST 13738-91, GOST 17575-90, GOST 17576-97, GOST 19657-84, GOST 29296-92, GOST 29303-92, GOST Р 50066-92, GOST Р 50067-92, GOST Р 50077-92
Non-ferrous metals, including rare, and their alloys	В51	GOST 14957-76

Chemical composition

Standard	Mn	Si	Ni	Fe	Cu	Al	Zn	Zr	Nd	Mg	Be
GOST 14957-76	≤0.1	≤0.05	≤0.005	≤0.05	≤0.05	≤0.05	≤0.2	0.3-0.8	2.5-3.5	Rest	≤0.002

Mg is the basis.
According to GOST 14957-76 the mass fraction of other impurities is ≤ 0.30%. "Other impurities" include impurities whose permissible content limits are not indicated (≤), as well as impurities not included in the table, the content of which is not determined. Beryllium is not determined, but is introduced by calculation.

Mechanical properties

Section, mm	s_T\|s_0,2, MPa	σ_U, MPa	d₅, %
Rolled steel in the delivery state
	130-180	230-280	9-12
Extruded GOST 19657-84. Artificial aging
	≥165	≥235	≥5

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