Brass L70

Designation

Name The value
Designation GOST Cyrillic Л70
Designation GOST Latin L70
Transliteration L70
By chemical elements Л70

Description

Brass L70 is used: for the manufacture of semi-finished products (strips, sheets, bands, pipes); radiator strips; heat exchangers; parts obtained by a deep hood; drawn and cold-rolled pipes used in heat exchangers.

Note

Simple (double) brass.
Brass L70 very well deformed in a cold condition; suitable for soldering, for use on steel.

Standards

Name Code Standards
Tape В54 GOST 15527-2004, GOST 2208-2007, TU 48-21-5036-83, TU 48-21-656-85
Tubes of non-ferrous metals and alloys В64 GOST 21646-2003
Non-ferrous metals, including rare, and their alloys В51 GOST 28873-90
Sheets and strips В53 TU 48-21-5031-91

Chemical composition

Standard Fe Cu Zn Sb Pb Bi
GOST 2208-2007 ≤0.07 69-71 Rest ≤0.002 ≤0.05 ≤0.002
Cu is the basis.
According to GOST 15527-2004, GOST 2208-2007 the amount of other elements should be ≤ 0,20%. In brass, the mass fraction of nickel is allowed up to 0.30% due to the mass fraction of copper, which is not taken into account in the sum of other impurities. For antimagnetic brass, the mass fraction of iron should not exceed 0.030%. In brass, used for the production of condenser tubes and heat exchangers, the mass fraction of arsenic is allowed up to 0.060% due to the mass fraction of copper, which is not taken into account in the sum of other impurities.

Mechanical properties

σU, MPa d10 HB, MPa HV, MPa
Strips and sheets cold rolled steel in the delivery state according to GOST 2208-2007 (samples)
270-360 ≥40 ≥70 ≥75
340-460 ≥20 ≥100 ≥115
≥430 ≥10 ≥125 ≥140
Tubes round, drawn and cold-rolled steel in the delivery state according to GOST 21646-2003 (samples)
≥340 ≥35 - -

Description mechanical marks

Name Description
σU Limit short-term strength
d10 Elongation after rupture
HB Brinell hardness number
HV The Vickers hardness

Physical characteristics

Temperature Е, HPa r, kg/m3 l, W/(m · °C) R, Mr. · m
20 115 8610 1214 69

A description of the physical symbols

Name Description
l Coefficient of thermal conductivity