C38500 Free-Cutting Brass (CuZn39Pb3)

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MA38B is the European reference standard for free-cutting brass with machinability rating of 100, moderate strength, and good resistance to corrosion. The alloy is used in the widest range of applications where excellent machining performance is the key selection criteria, including all types of special machined or micro-machined components with or without electrical requirement.

Mechanical Properties

Round Rod

TEMPER NAME  TEMPER CODE  TENSILE STRENGTH YIELD STRENGTH ELONGATION MILL LIMITS 
min, ksi (MPa) min, ksi (MPa)
@ 0.2%
min, %
soft anneal R360 52 (360) 46 (320) max 15 .02363 - .3150"
(6 - 8mm)
half-hard R430 62 (430) 32 (220) min 7 0.0787 - 0.3150"
(2 - 8 mm)
hard R500 73 (500) 51 (350) min 4

Round Wire

TEMPER NAME  TEMPER CODE  TENSILE STRENGTH YIELD STRENGTH ELONGATION MILL LIMITS 
min, ksi (MPa) min, ksi (MPa)
@ 0.2%
min, %
soft anneal R360 52 (360) 46 (320) max 15 .02363 - .3150"
(6 - 8mm)
half-hard R430 62 (430) 32 (220) min 4 0.0197 - 0.3150"
(0.5 - 8 mm)
hard R500 73 (500) 51 (350) min 4

Physical Properties

Melting Point (Liquidus) 1630°F 890°C
Melting Point (Solidus) 1610°F 875°C
Annealing Range (min - max) 800 - 1100 °F 427 - 593 °C
Density 0.306 lb/cu in 8.40 gm/cu cm
Electrical Resistivity (Annealed) 43.0 Ω·cir-mil/ft @ 68 °F 6.17 µΩ·cm @ 20 °C
Electrical Conductivity (Annealed) 28% IACS @ 68°F 0.162 MS/cm @ 20°C
Thermal Conductivity 71 Btu/sq ft/ft·hr/°F @ 68 °F 123 W/m·K @ 20 °C
Coefficient of Thermal Expansion 0.0000116°F (68-572°F) 0.0000210°C (20-300°C)
Modulus of Elasticity (Tension) 14,000 ksi 96,500 MPa
Modulus of Rigidity 5,300 ksi 36,500 MPa