ASTM B981 Low-Leaded Brass Rod, Bar, and Shapes

UNS C36300, C36500, C37000, C37100, and C37700
Round: Dia. 2.4 – 200mm
Hexagonal & Octagonal: 3 – 50mm
Square: 5-38mm
Rectangular: T: 5-38mm x W: 5-65mm

Features

ASTM B981 Low-Leaded Brass Rod, Bar, and Shapes

Chemical Composition (wt.%)

UNS No.	Cu(%)	Pb(%)	P(%)	Fe Max.(%)	Sn Max.(%)	Zn(%)	Copper Plus Elements with Specific Limits Present, min (%)
C36300	61.0–63.0	0.25–0.7	0.04–0.15	0.15	…	remainder	99.5
C36500	58.0–61.0	0.25–0.7	…	0.15	…	remainder	99.6
C37000	59.0–62.0	0.8–1.5	…	0.15	…	remainder	99.6
C37100	58.0–62.0	0.6–1.2	…	0.15	…	remainder	99.6
C37700	58.0–61.0	1.5–2.5	…	0.30	…	remainder	99.5

Mechanical Properties

Temper Code	Name	Diameter or Distance Between Parallel Surfaces, mm	Tensile Strength, min, MPa	Yield Strength at 0.5% Extension under Load, min, MPa	Elongation,min, %
H02	Half-hard	12 and under	430	190	10
		over 12 to 25, incl.	380	180	12
		over 25 to 50, incl.	330	165	20
		over 50	310	135	25

Technical Specifications

Specification	Value
Standard	ASTM B981 Low-Leaded Brass Rod, Bar, and Shapes
Grade	UNS C36300, C36500, C37000, C37100, and C37700 (CuZn39Pb2, CW612N, EN 2.0380)
Temper	H02 (Half-hard)
Manufacturing Process	Hot working, Cold working, and Annealing, Hot forging
Shape of Bars	Round, Hexagonal and Octagonal, Square and Rectangular
Density	8.9g/cm³
Diameter	Round: Dia. 2.4 – 200mm; Hexagonal & Octagonal: 3 – 50mm; Square: 5-38mm; Rectangular: T: 5-38mm x W: 5-65mm
Length	1000 – 6000mm
Inspection Certificate	EN 10204 Type 3.1 (Mill Test Certificate), EN 10204 Type 3.2 (Witness Testing or 3rd Party Inspection)
Tests	Chemcial Analysis, Tensile Test, UT/ET

Packing

Small diameter packed in plywood box; large diameter packed on plywood pallets.

Application

C36300 (Leaded Commercial Bronze): C36300 is a copper alloy with lead, prized for its machinability and often used in components like bushings and gears.
C36500 (Leaded Muntz Metal): C36500, a variant with higher lead content, finds common use in marine applications and architectural trim due to its enhanced machinability.
C37000 (Free Cutting Brass): C37000, comprising copper and zinc, boasts excellent machinability, making it ideal for fasteners, plumbing fittings, and electrical connectors.
C37100 (Free Cutting Brass with Selenium): C37100, featuring selenium for superior machinability, is preferred for intricate parts such as screws, nuts, and bolts requiring high-speed machining.
C37700 (Forging Brass): C37700, a copper-zinc alloy with added lead, excels in hot formability and cold workability, making it a go-to choice for forging valves, fittings, and plumbing fixtures.