C36500 Leaded Muntz is copper, alloyed with zinc, tin and lead.  Muntz metal has strength and corrosion resistance similar to C46400 Naval Brass but the higher lead content results in better machinability.  C365 Muntz metal found historical prominence in the shipbuilding industry, primarily as a hull liner.  C36500 Leaded Munts was adopted by the pressure vessel industry and is still, for many manufactures, the preferred alloy for tubesheets and condenser/cooler plates.  Because of its warm reddish gold hue and corrosion resistance, 365 Muntz also has numerous decorative and architectural applications.

Marmetal stocks C36500 Muntz Metal Plate

Specifications for C36500 Muntz Metal

ASTM ASME
Plate B-171 SB-171

Mechanical Properties for C36500 Leaded Muntz

Plate
TEMPER SIZE TENSILE, KSI, MIN YIELD@0.5%, KSI, MIN Elong. % Min
M20 3″ and under 50 20 35
O25 over 3″ to 5″ 50 18 35

Compositions for C36500 Muntz Metal

UNS No. Copper + Silver Tin Lead Iron Zinc
C36500 58.0-61.0 0.25 max 0.25-0.70 0.15 max Remainder

Physical Properties for C36500 Muntz Metal

Density @ 68o F 0.304 lb/in3
Melting Range 1625o -1650o F
Hot Formability Good
Cold Formability Limited
Machinability rating (C360 = 100) 60
Brazing Good
Soldering Excellent
Gas-shielded arc welding Fair
Oxy-acetylene welding Fair
Carbon-arc welding Not recommended
Coated metal-arc welding Not recommended
Resistant welding: spot and seam Not recommended
Resistance Welding: butt Fair

Applications for C36500 Muntz Metal

* Condensers
* Evaporators
* Tubesheets
* Heat Exchangers
* Fasteners
* Feedwater Heaters
* Architectural