Bronze Bra7

Designation

Name The value
Designation GOST Cyrillic БрА7
Designation GOST Latin BpA7
Transliteration BrA7
By chemical elements BaAl7

Description

Bronze Bra7 used: for the manufacture of semi-finished tapes and bands; elements of chemical engineering; moving contact; springs from the tape.

Note

Bronze is corrosion resistant to sulfuric and acetic acids, heat resistant, abrasion resistant.
Bronze brand Bra7 well deformed in a cold state.
Analog bronze Bra7 at CMEA 377−76 is bronze CuAl8.

Standards

Name Code Standards
Tape В54 GOST 1048-79, OST 4.021.079-92
Non-ferrous metals, including rare, and their alloys В51 GOST 18175-78, GOST 28873-90, OST 4.021.009-92
Sheets and strips В53 TU 48-21-181-82

Chemical composition

Standard P Mn Si Fe Cu Al Zn Sn Pb
GOST 18175-78 ≤0.01 ≤0.5 ≤0.1 ≤0.5 Rest 6-8 ≤0.5 ≤0.1 ≤0.03
Cu is the basis.
According to GOST 18175-78, the total mass fraction of normalized impurities is ≤ 1.10%. As agreed by the manufacturer with the consumer, the content of impurities of arsenic and antimony can be normalized. The mass fraction of nickel is allowed up to 0.50% without taking it into account in the total amount of impurities.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d10 HV, MPa
Cold-rolled steel strip 0.1-1.0 mm in the delivery state on the EAST 4.021.079-92. (T/o for "heat-Treated": the Annealing at 260-280 °C (aging of 0.5-1.0 h)
0.5-1 470-720 570-770 ≥5 -
0.5 510-755 589-785 ≥3 -
0.5-1 ≥490 ≥590 ≥10 -
0.5 ≥490 ≥590 ≥5 -
Cold-rolled steel strip of 0.1-2.0 mm in the delivery state according to GOST 1048-79. (T/o for "heat-Treated": the Annealing at 260-280 °C (aging of 0.5-1.0 h)
0.5-1.2 ≥720 ≥770 - ≥230
0.5 ≥760 ≥780 - ≥230
0.5-1.5 470-720 570-770 ≥5 180-240
0.5 510-760 590-780 ≥3 180-240
0.5-2 ≥490 ≥590 ≥10 -
0.5 ≥490 ≥590 ≥5 -

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d10 Elongation after rupture
HV The Vickers hardness

Physical characteristics

Temperature Е, HPa r, kg/m3 l, W/(m · °C) R, Mr. · m
20 120 7800 80 110

A description of the physical symbols

Name Description
Е The normal elasticity modulus
r Density
l Coefficient of thermal conductivity