Brass LA77-2

Designation

Name The value
Designation GOST Cyrillic ЛА77-2
Designation GOST Latin LA77-2
Transliteration LA77-2
By chemical elements ЛAl77-2

Description

Brass LA77−2 is used: for the manufacture of tube sheets for condensers and heat exchangers; drawn and cold-rolled pipes used in heat exchangers; seawater-resistant machinery parts; high load fittings; products of medium strength and good corrosion resistance.

Note

Complex alloyed brass.

Standards

Name Code Standards
Tape В54 GOST 15527-2004
Tubes of non-ferrous metals and alloys В64 GOST 21646-2003
Non-ferrous metals, including rare, and their alloys В51 GOST 28873-90

Chemical composition

Standard P Fe Cu Al Zn Sb Pb Bi
GOST 15527-2004 ≤0.01 ≤0.07 76-79 1.7-2.5 Rest ≤0.005 ≤0.07 ≤0.002
Cu is the basis.
According to GOST 15527-2004 the sum of other elements should be ≤ 0.30%. In brass, the mass fraction of nickel is allowed up to 0.50% due to the mass fraction of copper, which is not taken into account in the sum of other impurities.

Mechanical properties

σU, MPa d10
Tubes round, drawn and cold-rolled steel in the delivery state according to GOST 21646-2003 (samples)
≥320 ≥45
≥370 ≥40

Description mechanical marks

Name Description
σU Limit short-term strength
d10 Elongation after rupture

Physical characteristics

Temperature r, kg/m3
200 8300

A description of the physical symbols

Name Description
l Coefficient of thermal conductivity