Brass Rod – Inside and Out

Brass Rod – Inside and Out
1
Comparison of Alloys – Alloying Element Levels
Alloy
ASTM Std.
Copper
(%)
Lead
(%)
Silicon
(%)
Phos.
(%)
C27450
B927
60 - 65
0.25 max
-
0.04 – 0.10
C34500
B453
62 - 65
1.5 – 2.5
-
-
C35000
B453
61 - 63
0.8 – 2.0
-
-
C35300
B453
61 - 63
1.5 – 2.5
-
-
C36000(1)
B16
60 - 63
2.5 – 3.0
-
-
C36300(2)
B981
61 - 63
0.25 – 0.7
-
0.04 – 0.15
C36500
B124
58 - 61
0.25 – 0.7
-
-
C37000
B124
59 - 62
0.8 – 1.5
-
-
C37700
B124
58 - 61
1.5 – 2.5
-
-
C69300
B371
73 - 77
0.09 max
2.7 – 3.4
0.04 – 0.15
Zinc
(%)
R
E
M
A
I
N
D
E
R
1) New lead content per ASTM B16; 2) UNS registered on 12/8/10
Considered Low Lead
Considered Lead-free
2
Microstructure Comparison at 500X – Leaded, Low Lead and
Lead-Free Copper Alloys
Lead = 2.7%
Lead
ά
C36000
Lead = 0.17%
ά
β
C27450
Lead = 0.05%
ά
κ+γ
C69300
3
Machinability (%) and Strength (ksi)
Machinability vs. Strength
120
100
100
96
89
80
60
85
90
80
73
70
57
55
60
62
C36300
C27450
40
20
0
C36000
C37700
C34500
Machinability (Left Bar)
C69300
Tensile Strength (Right Bar)
4
Low Melting Temperature Particles (Pb, Bi) Reduce Toughness
During Machining
Impact Strength as a Function of Temperature
Impact Strength (J/cm2)
350
300
250
C69300
200
150
100
C36000
2% Bismuth Brass
50
0
20
150
200
250
300
350
400
Temperature (C)
5
Corrosion Resistance
6
ISO 6509 Dezincification Performance
Corrosion depth after ISO6509
dezincification test
(12.7 g/l CuCl2.2H2O for 24 hrs. at 167F).
C69300 Green
Dot™
C36000
7
ISO 6509 Dezincification Depth (Microns)
(In order of alloy number)
900
= 0.060”
800
700
600
500
450
400
440
300
200
= 0.020”
195
100
0
0
C27450
C36000
Average
C36300
Minimum
C69300
Maximum
8
Stress Corrosion Cracking Performance in
ASTM G37
2
C69300
Torque Level
1.75
1.5
1.25
C360, C27450
1
0.75
0.5
0
200
400
600
800
1000
1200
Hours to Appearance of Cracks
144
1000
NOTE: 1000 hours represents no cracks
9