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C21000 Gilding Brass pipe/tube
C21000 is a high-conductivity brass alloy composed primarily of copper (94–96%) with zinc as the balancing element, along with trace amounts of iron (≤0.05%) and lead (≤0.05%) . It is classified as a 95% copper brass (CuZn5) and is notable for its excellent thermal and electrical conductivity, corrosion resistance (especially in marine environments), and non-magnetic properties . The alloy also exhibits good cold and hot workability, making it suitable for applications like heat exchangers, marine hardware, electrical components, and condenser tubes .

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Parameter
Chemical Composition
Mechanical Properties
Dimensional Ranges for C21000 Copper Tubes

C21000 seamless brass tubes are manufactured in the following size ranges:

  • Outer Diameter (OD): 30–400 mm .
  • Wall Thickness: 3–42.5 mm .
  • Length: 0.5–6 meters (customizable) .

These dimensions are standardized for high-performance applications in HVAC systems, marine engineering, and industrial heat exchange .


International Standards

C21000 copper tubes comply with the following key standards:

  1. ASTM Standards:

    • ASTM B36M: Standard specification for brass (C21000) seamless tubes for general applications .
    • ASTM B587: Standard for welded brass tubes, including C21000 .
    • ASTM B642: Specification for welded C21000 alloy water tubes .
    • ASTM B135: Covers seamless and welded brass tubes for condensers and heat exchangers .

  2. Other Standards:

    • ISO: CuZn5 (equivalent to C21000) .

    • GB/T 5231-2012: Chinese standard for H95 brass (C21000 equivalent) .



Chemical Composition

C21000 is a high-copper brass alloy (also classified as "red brass") with a primary composition of copper (Cu) and zinc (Zn), along with trace elements. The exact chemical limits are standardized under ASTM specifications such as ASTM B36/B36M and ASTM B587. Here is the detailed composition:

ElementContent Range (wt%)Notes
Copper (Cu)94.0–96.0%Primary constituent
Zinc (Zn)BalanceTypically 4–6% (residual)
Lead (Pb)≤0.05%Strictly controlled impurity
Iron (Fe)≤0.05%Impurity limit per ASTM B36
Other Impurities≤0.3% (total)Includes P, Sb, Bi, etc. [1](#user-content-ref-4), [3](#user-content-ref-6), [18](#user-content-ref-12), [31](#user-content-ref-22)

Key Points:

  • C21000 is distinct from nickel-containing alloys (e.g., [31] incorrectly mention nickel; this appears to be an error, as other ASTM sources confirm it is a Cu-Zn alloy).

  • The alloy is often referenced as H95 in Chinese standards (GB/T 5231) and CuZn5 in European standards [35](#user-content-ref-22).




Mechanical Properties

C21000 exhibits a combination of high strength, ductility, and excellent cold-working capabilities. Properties vary depending on temper (annealed, cold-rolled, etc.):

Typical Room-Temperature Mechanical Properties
PropertyAnnealed (Soft) StateCold-Worked (Hard) State
Tensile Strength (σb)205–290 MPa400–610 MPa
Yield Strength (σ₀.₂)70–120 MPa350–400 MPa
Elongation (δ)35–42% (δ10)10–25% (δ10)
Shear Strength221–260 MPa–
Hardness (Rockwell B)20–48 HRB60–85 HRB
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FAQ

Q1:Do you provide samples? Is it free or extra?
A1:Yes, we can provide samples free of charge and the customer will pay the freight.
Q2:What if I don't have export experience ?
A2:We have reliable forwarder agent which can ship items to you by sea/air/Express to your doorstep. Any way, we will help you choose the most suitable shipping service.
Q3:How long is your lead time?
A3:If it is in stock, it is usually 5-10 days. Or, if there is no inventory, 15 days, depending on the quantity.
Q4:What are your terms of payment?
A4:30% T/T deposit in advance, 70% T/T balance within 5 days after B/L copy, 100%.Irrevocable L/C at sight, 100% Irrevocable L/C after receive B/L 30-120 days, O/A.
Q5:How is your technical support?
A5:We provide lifetime online support through Whatsapp/ Skype/ Wechat/ Email. Any problem after delivery, we will offer you call anytime.

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