Nacobre Denomination: 272
Designation: Yellow brass, 65%

The brass tubing based on copper has zinc percentages that varies from 15 to 35%. This combination are characterized by its facility for cold working, its good mechanical resistance and its pleasant color from pink to yellow depending upon the content of zinc. The corrosion resistance is similar to the pure copper with zinc percentages up 15%, higher contents improve the corrosion under stress. Certain corrosive agents cause an characteristic effect called deszincification. Within main applications of brass tuging is fantasy jewerly, lamps, music instruments, plumbing accessories, fumigatos, radiators, antennas.

FEASIBLE DIMENSION


Lengths:

All of the sizes are produced from 8 to 30 Ft.

Another lengths should be requested as fabrication feasibility


CHEMICAL COMPOSITION

Alloy

Cu (%)

Pb(%)

Fe(%)

Zn(%)

C27200

62.0 - 65.0

0.07 Max.

0.07 Max

Resto

PROPIEDADES MECÁNICAS

Alloy

Temper

Tensible Strength
(ksi)

Average Grain Size (mm)

Expansion (%)

C27200

H55

60-80

0.010 Min.

 

C27200

H58

54 Min.

 

 

C27200

H80

66 Min.

 

 

C27200

HR50

54 Min.

 

 

C27200

HR04

66 Min.

 

 

C27200

O50

 

0.035 Max.

Hasta ¾” OD 20%
Arriba de ¾” OD 15%

C27200

O60

 

0.025–0.060

Hasta ¾” OD 20%
Arriba de ¾” OD 15%


Alloy

Mercurous Nitrate

Hardness

C27200

 

60 – 80 RB

C27200

 

53 Min. R30T

C27200

 

70 Min. R30T

C27200

Req.

53 Min. R30T

C27200

Req.

70 Min. R30T

C27200

 

60 Max. R30T(WT up 0.030”)
90 Max. RF (WT over de 0.030”)

C27200

 

40 Max. R30T (WT up 0.030”)
80 Max. RF (WT over 0.030”)

PHYSICAL PROPERTIES


 

UNITS

C27200

MELTING POINT
(LIQUIDUS)

°F (°C)

1710 - (930)

MELTING POINT (SOLIDUS)

°F (°C)

1660 - (905)

DENSITY (TO 20°C)

Lb/cu,in

0.306

COEFICIENT OF THERMAL
EXPANSION

Per °F From
68 to 572

11.3 X 10-6

THERMAL CONDUCTIVITY

Btu/sq.ft./ft/hr/
°F to 68°F

67

ELECTRICAL RESISTIVITY
(ANNEALED)

Ohms
(circ.mil./ft) to
68 °F

38.4

ELECTRICAL CONDUCTIVITY
(ANNEALED)

% IACS to 68°F

27

THERMAL CAPACITY
(SPECIFIC HEAT)

Btu/lb/°F to
68|°F

0.09

MODULUS OF ELASTICITY
(TENSION))

ksi

15000

MODULUS OF RIGIDITY

Ksi

5600

ANNEALED TEMPERATURE

°F - °C

800-1300 - 425-700

SUITABILITY FOR BEING JOINED BY


 

Alloy

Soldering

Brazing

Oxyacetylene Welding

Carbon Arc Welding

C27200

Excelente

Excelente

Buena

Regular


Alloy

Gas Shielded Arc Welding

Coated Metal Arc Welding

Resistance welding

Spot

Seam

Butt

C27200

Fair

Not recommended

Good

Not recommended

Good

DECIMAL EQUIVALENTS IN INCHIDES FOR VARIOUS GAGES


Gage.No

1

2

3

4

5

6

BWG

.0.300

0.284

0.259

0.238

.0.220

0.203

AWG

0.2893

0.2576

0.2294

0.2043

0.1819

0.162


Gage.No

7

8

9

10

11

12

BWG

0.180

0.165

0.148

0.134

0.120

0.109

AWG

0.1443

0.1285

0.1144

0.1019

0.0907

0.0808


Gage.No

13

14

15

16

17

18

BWG

0.095

0.083

0.072

0.065

0.058

0.049

AWG

0.0720

0.0641

0.0571

0.0508

0.0453

0.0403


Gage.No

19

20

21

22

23

24

BWG

0.042

0.035

0.032

0.028

0.025

0.022

AWG

0.0359

0.0320

0.0285

0.0253

0.0226

0.0201

NON DESTRUCTIVE TESTS AVAILABLE

EDDY CURRENT TEST

HYDROSTATIC TEST

PNEUMATIC TEST

 

MAXIMUM WORK PRESSURE

P = Maximum work pressure (psi)

S = Minimum tensile strength of material for an

specific temper (It is the the value of the

tensile strength in psi in Mechanica

properties table)

D = Exterior diameter of tube

T = Wall thickness of tube

 

APPLICABLE STANDARDS

ASTM

ASME

BRITISH STANDARD

DIN

JIS

MIL

WEIGTH PER FEET

W= WEIGTH PER FEET( lb/ft)

D= OUTSIDE DIAMETER( in)

P= WALL THICKNESS ( in)

W= ( D-P)*P*11.61

Note: The cracking pressure is the value of 5 times the work pressure