C23000 Red Brass Pipe | 85/15 Seamless Pipe, ASTM B43

Q: Can C23000 be used for drinking water?

Yes, when the finished product is certified. C23000 has a maximum lead content of 0.05% and is used in potable water systems. In North America, finished installations require NSF/ANSI 61 and 372 certification.

C23000 Red Brass Pipe consists of an alloy of copper and zinc with 85 percent copper and 15 percent zinc and is commonly known as Red Brass 85 percent. C23000 Red Brass Pipe is defined as a seamless red brass pipe as per ASTM B43 specification. It is resistant to corrosion, has thermal conductivity of 159W/m K and a reddish gold color. The pipe is available in B43 regular and extra strong wall thicknesses, in O61 (annealed) and H58 (drawn) temper, for water service, handrails, guardrails and conduits. USA Piping Solutions provides C23000 pipe with EN 10204 3.1 mill test certification.

Specifications of C23000 Red Brass Pipe

Specification / Standard	Designation / Detail
UNS / CDA Name	UNS C23000 / Red Brass 85%
EN / BS Designation	EN CW502L (CuZn15) / BS CZ102
ASTM B43 / ASME SB43	Standard Specification for Seamless Red Brass Pipe, Standard Sizes
ASTM B43 Tempers	O61 (Annealed) \| H58 (Drawn General Purpose)
ASTM B43 Mandatory Tests	Hydrostatic testing (or non-destructive eddy current testing), pneumatic test, mercurous nitrate test (or ammonia vapor test) for residual stress, grain size determination, and expansion test (client to confirm lot test scope)
ASTM B135 / ASME SB135	Standard Specification for Seamless Brass Tube (Covers C23000 tube sizes and wall dimensions outside NPS pipe schedules)

Chemical Compositions of C23000 Red Brass Pipe

Element	Limit, % (UNS C23000)	Technical Note
Copper (Cu)	84.0 to 86.0	Nominal 85.0%; total Cu plus named elements: 99.8% min
Lead (Pb)	0.05 max	Lead-free by composition (substantially below 0.25% max)
Iron (Fe)	0.05 max	Impurity limit controlled to preserve grain ductility
Zinc (Zn)	Remainder	Nominal 15.0% balance

C23000 Red Brass Pipe Mechanical Properties

Temper Condition	Section Size / Diameter	Tensile Strength min, ksi (MPa)	Yield Strength (0.5% extension), min ksi (MPa)	Elongation in 2 in., min %
H01 (Quarter Hard)	Under 0.50 in (12.7 mm)	44 (305)	20 (140)	15
H01 (Quarter Hard)	0.50 to 1.00 in (12.7 to 25.4 mm)	42 (290)	17 (115)	17
H01 (Quarter Hard)	Over 1.00 in (25.4 mm)	40 (275)	15 (103)	19
H02 (Half Hard)	Under 0.50 in (12.7 mm)	50 (345)	30 (205)	7
H02 (Half Hard)	0.50 to 1.00 in (12.7 to 25.4 mm)	45 (310)	27 (185)	10
H02 (Half Hard)	Over 1.00 in (25.4 mm)	40 (275)	25 (170)	12
H04 (Hard)	Under 0.50 in (12.7 mm)	63 (435)	40 (275)	5
H04 (Hard)	0.50 to 1.00 in (12.7 to 25.4 mm)	60 (415)	37 (255)	7
H04 (Hard)	Over 1.00 in (25.4 mm)	58 (400)	35 (240)	9

Physical Properties of C23000 Red Brass Pipe

Property	Value (Imperial)	Value (Metric / SI)
Melting Point (Solidus / Liquidus)	1810 / 1880 °F	988 / 1027 °C
Density (at 68 °F / 20 °C)	0.316 lb/in³	8.75 g/cm³
Electrical Conductivity	37 %IACS (at 68 °F)	21.5 MS/m
Thermal Conductivity	92 Btu/ft·h·°F (at 68 °F)	159 W/m·K (at 20 °C)
Modulus of Elasticity (Tension)	17,000 ksi	117 GPa
Coefficient of Thermal Expansion	10.4 × 10⁻⁶ /°F (68 to 572 °F)	18.7 × 10⁻⁶ /K (20 to 300 °C)
Specific Heat Capacity	0.09 Btu/lb·°F (at 68 °F)	0.38 kJ/kg·K (at 20 °C)

C23000 Red Brass Pipe and Schedule Dimensions

Nominal Pipe Size (NPS)	Outside Diameter (OD), in (mm)	Regular Wall, in (mm)	Regular Weight, lb/ft (kg/m)	Extra-Strong Wall, in (mm)	Extra-Strong Weight, lb/ft (kg/m)
1/8 in	0.405 in (10.29 mm)	0.062 in (1.57 mm)	0.253 lb/ft (0.376 kg/m)	0.095 in (2.41 mm)	0.363 lb/ft (0.540 kg/m)
1/4 in	0.540 in (13.72 mm)	0.082 in (2.08 mm)	0.447 lb/ft (0.665 kg/m)	0.119 in (3.02 mm)	0.611 lb/ft (0.909 kg/m)
3/8 in	0.675 in (17.15 mm)	0.090 in (2.29 mm)	0.627 lb/ft (0.933 kg/m)	0.126 in (3.20 mm)	0.829 lb/ft (1.234 kg/m)
1/2 in	0.840 in (21.34 mm)	0.107 in (2.72 mm)	0.934 lb/ft (1.390 kg/m)	0.147 in (3.73 mm)	1.230 lb/ft (1.830 kg/m)
3/4 in	1.050 in (26.67 mm)	0.114 in (2.90 mm)	1.270 lb/ft (1.890 kg/m)	0.154 in (3.91 mm)	1.670 lb/ft (2.485 kg/m)
1 in	1.315 in (33.40 mm)	0.133 in (3.38 mm)	1.830 lb/ft (2.723 kg/m)	0.179 in (4.55 mm)	2.380 lb/ft (3.542 kg/m)
1-1/4 in	1.660 in (42.16 mm)	0.140 in (3.56 mm)	2.470 lb/ft (3.676 kg/m)	0.191 in (4.85 mm)	3.280 lb/ft (4.881 kg/m)
1-1/2 in	1.900 in (48.26 mm)	0.145 in (3.68 mm)	2.950 lb/ft (4.390 kg/m)	0.200 in (5.08 mm)	3.970 lb/ft (5.908 kg/m)
2 in	2.375 in (60.33 mm)	0.154 in (3.91 mm)	4.020 lb/ft (5.982 kg/m)	0.218 in (5.54 mm)	5.510 lb/ft (8.199 kg/m)
2-1/2 in	2.875 in (73.03 mm)	0.203 in (5.16 mm)	6.320 lb/ft (9.405 kg/m)	0.276 in (7.01 mm)	8.350 lb/ft (12.426 kg/m)
3 in	3.500 in (88.90 mm)	0.216 in (5.49 mm)	8.250 lb/ft (12.277 kg/m)	0.300 in (7.62 mm)	11.200 lb/ft (16.667 kg/m)
4 in	4.500 in (114.30 mm)	0.237 in (6.02 mm)	11.800 lb/ft (17.560 kg/m)	0.337 in (8.56 mm)	16.300 lb/ft (24.257 kg/m)

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Applications and Industrial Uses of C23000 Red Brass Pipe

Plumbing and Water-Service Piping
Underground Water Distribution Systems
Boiler Feedwater Lines
Architectural Handrails and Guardrails
Building and Construction Hardware
Industrial Fluid-Handling Systems
Decorative Metalwork and Architectural Trim
Electrical Conduits and Protective Tubing

Frequently Asked Questions

What is C23000 red brass pipe?

C23000 red brass pipe is an 85/15 copper-zinc seamless pipe (UNS C23000 / EN CW502L) manufactured to ASTM B43. It contains 84.0 to 86.0% copper and provides strong corrosion resistance and workability.

Which standard covers C23000 pipe?

C23000 seamless pipe is governed by ASTM B43 / ASME SB43. Seamless tubing in C23000 is also produced to ASTM B135.

What are the O61 and H58 tempers?

Under ASTM B43, O61 is an annealed temper designed for plumbing, underground water service, and boiler lines requiring bending and flaring. H58 is a drawn, general-purpose temper providing rigid strength for handrails, guard rails, and structural conduits.

What is the difference between C23000 and C22000 or C24000?

C23000 contains 85% copper (85/15) and is the standard alloy covered by ASTM B43 for red brass pipe. C22000 contains 90% copper (Commercial Bronze 90%), while C24000 contains 80% copper (Low Brass 80%).

Is C23000 lead free?

Yes. C23000 restricts lead content to 0.05% maximum, which is below the 0.25% weighted-average limit required for lead-free classification.

Can C23000 be used for drinking water?

Yes, when the finished product is certified. C23000 has Pb 0.05% max and is used in potable water systems. In North America, finished installations require NSF/ANSI 61 and 372 certification.

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