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C22000 brass tubes are available in seamless and welded forms, adhering to standardized dimensional ranges under international specifications:
Round Tube Dimensions (Primary Focus):
- Outer Diameter (OD):
- Imperial: Ranges from 1/8" (3.18 mm) to 12" (304.8 mm) nominal, with common sizes including 2.5 mm, 6.35 mm (1/4"), 12.7 mm (1/2"), and 22 mm .
- Metric: 6 mm to 54 mm (standard) or up to 120 mm for specialized applications .
- Wall Thickness:
- Seamless Tubes: 0.020" (0.508 mm) to 0.250" (6.35 mm) .
- Welded Tubes: Customizable based on engineering requirements, typically 0.25 mm to 3 mm .
- Seamless Tubes: 0.020" (0.508 mm) to 0.250" (6.35 mm) .
Tolerances and Mechanical Properties (ASTM Standards):
- Tensile Strength: 40–52 ksi (276–359 MPa) in drawn (H) temper .
- Hardness (Rockwell): 30T 30–55 .
Grain Size: ≤0.060 mm for annealed (O60) temper
International Standards
C22000 tubes comply with the following key standards:
Detailed Chemical Composition of C22000 Copper Alloy
C22000, also known as Commercial Bronze or H90 brass, is a copper-zinc alloy with minor trace elements. Its chemical composition is standardized as follows (by weight percentage):
- Copper (Cu): 89.0–91.0%
- Zinc (Zn): Balance (approximately 9.0–11.0%)
- Iron (Fe): ≤0.05%
- Lead (Pb): ≤0.05%
- Other impurities (total): ≤0.3%
This composition ensures a balance of ductility, corrosion resistance, and workability. Notably, the low iron and lead content minimizes brittleness and enhances cold-working properties
Mechanical Properties of C22000 Copper Alloy
The mechanical properties of C22000 vary significantly depending on its processing state (e.g., annealed, cold-worked). Below is a comprehensive breakdown:
1. Basic Mechanical Properties (Annealed State):
- Tensile Strength (Ultimate): 200–260 MPa
- Yield Strength (0.2% Offset): 69–150 MPa
- Elongation (at Break): 15–45%
- Shear Strength: 200–300 MPa
- Hardness:
- Brinell Hardness (HB): 70–200 HB
- Rockwell B Hardness: 42–81 HRB
- Brinell Hardness (HB): 70–200 HB
- Elastic Modulus: 110–115 GPa
- Poisson’s Ratio: 0.33
2. Enhanced Properties After Cold Working:
Cold deformation significantly improves strength and hardness:
- Tensile Strength: Up to 520 MPa
- Yield Strength: Up to 500 MPa
- Elongation: Reduced to 1.9–10% (depending on strain)
- Hardness (Rockwell 30T): 47–73 HR30T
3. Compressive Strength:
- Compressive Strength: >600 MPa (noted in specialized reports for high-load applications) .
Production process and product advantages of C22000 copper tube:
1. Production process
Melting and continuous casting
The raw materials are cathode copper and phosphor copper alloy, which are melted at a high temperature of 1200℃ in an industrial frequency furnace and then formed by horizontal continuous casting. This process can effectively control the uniformity and dimensional accuracy of the tube blank.
Horizontal continuous casting-planetary tube rolling method and planetary ball mold spinning process have further improved production efficiency and product quality, reaching the domestic advanced level.
Rolling and stretching
The planetary rolling process uses a long-stroke, ring-hole tube rolling machine to significantly reduce the eccentricity problem of the copper tube and improve dimensional accuracy.
The stretching process uses a high-speed series joint drawing machine and a multi-wire stretching machine with independent technology, combined with the floating core head technology, to ensure that the product has high internal and external surface finish and small dimensional tolerance.
Annealing and surface treatment
Online annealing uses a net chain bright annealing technology to keep the copper tube surface free of oxidation spots and scratches and maintain a bright state.
The surface cleaning process is enhanced with corrosion resistance and durability through rewinding flaw detection and anti-rust electroplating treatment (such as five-layer electroplating).
Environmental protection and recycling
The waste emulsion (S2), copper chips (S3) and waste mineral oil (S5) generated during the production process are all recycled, and the waste gas (G1-G4) and slag (S1) are discharged in compliance with the standards after treatment.
2. Product advantages
Excellent physical properties
High electrical conductivity and thermal conductivity: The copper content is 90%, and the electrical conductivity is close to that of pure copper, which is suitable for electronic equipment and heat exchangers.
Good mechanical properties: tensile strength ≥390 MPa, elongation ≥3%, high strength and plasticity, and excellent cold and hot processing performance.
Corrosion resistance
It exhibits high corrosion resistance in the atmosphere, fresh water and humid environment, and has no tendency to stress corrosion cracking. It is suitable for water supply pipes, ship parts, etc.
Processing and surface characteristics
The surface finish is high, and it can be plated with metal or coated with enamel, which is suitable for high-end uses such as decorations and medals.
High-precision rolling and stretching processes ensure that the copper tube has good straightness, no straightening marks, and strict tolerance control.
Widely used
Covering the fields of construction (water supply and drainage pipes), industry (condenser pipes, heat exchangers), art (medals, sculptures) and electronics (air conditioning accessories).
Environmental protection and certification
Comply with international standards such as ASTM, SAE, JIS, etc. Some products have passed ISO9001 and CE certification and meet lead-free environmental protection requirements.
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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