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Size range and international standards of C12000 copper tube:
Size range
Outer diameter range:
Minimum outer diameter: 2 mm (ordinary pipe application), 3/16 inch (about 4.76 mm, dedicated to refrigeration equipment).
Maximum outer diameter: 914 mm (conventional industrial pipe), 328 mm (air conditioning and refrigeration field), 12 inches (about 304.8 mm, seamless pipe application).
Other common ranges:
3 mm to 328 mm (air conditioning and refrigeration and heat exchange system)
6 mm to 300 mm (flexible copper tube, in accordance with ASTM B280)
2-450 mm (general copper tube specifications).
Wall thickness range:
Thinnest wall thickness: 0.2 mm (general industrial pipe), 0.28 mm (thin wall tube for refrigeration).
Maximum wall thickness: 50 mm (conventional industrial pipe), 120 mm (special refrigeration pipe), 15 mm (air conditioning pipe).
Other common ranges:
0.5-15 mm (air conditioning and heat exchange systems)
0.6-20 mm (flexible copper tube).
Length range:
Straight tube: 1-6 meters (standard length), customizable up to 50 meters.
Coil: 15-50 meters (for refrigeration equipment only).
International standards
C12000 copper tubes comply with the following international standards:
Chinese standards:
GB/T 1527-2006 (copper and copper alloy drawn tubes)
GB/T 17791-2007 (copper tubes for refrigeration)
GB/Y1527-2017 (technical conditions for copper tubes).
American standards:
ASTM B68 (general specification for seamless copper tubes)
ASTM B75M (standard for seamless copper tubes)
ASTM B280 (copper tubes for air conditioning and refrigeration)
ASME B31.3 (pressure piping specification, covering the seamless tube application of C12000).
Japanese standards:
JIS H3300:2006 (copper and copper alloy seamless pipes)
JIS H3300:1997 (refrigeration pipe standard).
Other standards:
EN10204 3.1/3.2 (material certification standard)
AS/NZS1571 (Australia/New Zealand standard).
Main ingredients:
Copper (Cu): content ≥99.90% (with other elements the sum does not exceed 0.1%).
Phosphorus (P): content ranges from 0.004% to 0.012% (some standards such as ASTM B152/B152M-2019 stipulate 0.004% to 0.035%). The role of phosphorus is deoxidation, improving weldability and corrosion resistance.
Impurity elements (extremely low content, usually not exceeding the following limits):
Lead (Pb), iron (Fe), nickel (Ni), antimony (Sb), arsenic (As), bismuth (Bi), sulfur (S), etc.: total impurity content ≤0.1%, and the content of each element alone is usually ≤0.02%.
Oxygen (O): controlled by phosphorus deoxidation process, the residual content is extremely low.
Mechanical properties:
Tensile strength (σb): ≥295 MPa (room temperature tensile properties of the strip)
Elongation (δ10): ≥3% (reflects the plasticity of the material)
Hardness:
Annealed state: about 55~80 HV (Vickers hardness)
Cold working state: up to 80~100 HV
Other properties:
Good cold bending and welding properties, suitable for pipeline forming
No tendency to "hydrogen disease", can be used in reducing atmosphere
Physical properties:
Electrical conductivity and thermal conductivity: high, but the addition of phosphorus makes it slightly lower than pure copper
Corrosion resistance: good performance in fresh water, sea water and general atmospheric environment, but susceptible to nitric acid and sulfur-containing media
The production process and product advantages of C12000 copper tube are as follows:
1. Production process
Raw material processing and smelting
Using cathode copper and phosphor copper alloy as raw materials, they are melted at a high temperature of 1200℃ through an industrial frequency furnace to form a liquid copper alloy.
2. Forming process
Continuous casting and cooling: The horizontal continuous casting process is adopted, and the copper tube billet is formed after cooling to 50℃.
Rolling and stretching: Processed through planetary rolling (improving dimensional accuracy), triple drawing (reducing eccentricity), disk drawing (surface finish) and other processes. Some processes use high-speed series joint drawing machines or floating core head stretching technology to improve the yield rate and precision.
Annealing treatment: Matching net chain bright annealing process to eliminate processing stress and keep the surface free of oxidation spots.
Post-processing and testing
Straightening and cleaning: Use high-precision straightening machines to ensure straightness, and clean the surface to remove impurities.
Flaw detection and testing: Ensure defect-free through online eddy current detection, and accurately analyze performance with Swiss direct reading spectrometers, electronic tensile machines and other equipment.
Environmental protection measures: waste emulsion, copper scraps and other by-products are recycled, and energy-saving processes use variable frequency power regulation and energy management systems.
2. Product advantages
Excellent physical properties
Thermal conductivity: Unparalleled thermal conductivity (99.9% pure copper), suitable for heat exchangers, refrigeration systems and other scenarios that require precise temperature control.
Electrical conductivity: High conductivity (ASTM B68 standard), meeting the needs of electrical circuits and components.
Corrosion resistance and durability
Corrosion resistance: Phosphorus deoxidation process enhances corrosion resistance and maintains reliability in extreme environments.
Long life: Low maintenance requirements, life cycle costs are significantly lower than ordinary metals.
Processing and environmental characteristics
Plasticity: Easy to form into round tubes, square tubes, special-shaped tubes, etc., supporting customized outer diameters (3mm-914mm), wall thicknesses (0.2mm-50mm) and lengths (1m-50m).
Recyclability: 100% recyclable, in line with environmental protection requirements, reducing carbon footprint.
Antibacterial property: Naturally inhibits bacterial growth, suitable for medical, food processing and drinking water systems.
Wide application range
Covers HVAC, refrigeration equipment, petroleum refining, shipbuilding, power systems and other fields.
Special scene applications: such as oxygen pipelines, hydraulic systems, instrument pressure pipes, etc.
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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