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Size range
Depending on different production standards and application requirements, the size range of C27400 copper rods is relatively wide:
Rods: diameter 1.0mm to 300mm, length is usually 6 meters, and various surface treatment forms such as black leather rods, cold drawn rods, and bright rods are available.
International standards
The international standards corresponding to C27400 include:
American standard: ASTM B135/B135M-2017 (seamless brass tube specification), UNS number is C27400.
ISO standard: CuZn37 (Copper-Zinc 37 alloy).
European standard: EN standard is CuZn37, German DIN standard is CuZn36.
Japanese standard: JIS C2720.
British standard: BS CZ 108.
Russian standard: Л62 (GOST L-63).
Chemical composition (mass percentage)
Copper (Cu): 61%-64%
Zinc (Zn): Balance (about 35%-39%)
Lead (Pb): ≤0.10% (some data suggest 0.08%-0.5%, but most limit to ≤0.1%)
Iron (Fe): ≤0.05%-0.15%
Other elements (such as nickel, tin, aluminum, etc.): Total ≤0.5%
Mechanical properties are significantly affected by processing state (such as soft state, hard state, hot state, etc.), and typical values are as follows:
Tensile strength (σ₆)
Soft state (M): ≥290 MPa (such as annealed state)
Hard state (H80): 510 MPa (about 74 ksi)
General standard: 220-585 MPa (depending on processing state)
Yield strength (σ₀.₂)
Soft state: ≥160 MPa
Hard state (H80): 379 MPa (about 55 ksi)
Other states: 28-48 ksi (about 193-331 MPa)
Elongation (δ)
Soft state: ≥30%
Hard state: 10%-15%
Semi-hard state: ≥15%-20%
Hardness
Vickers hardness (HV): 85-175 (depending on state)
Rockwell hardness (HRB) ：10-20
Other properties
Electrical conductivity: 27%-30% IACS (lower than pure copper, but better than most alloys)
Thermal conductivity: 67-138 W/(m·K)
Density: 8.7 g/cm³
Production process and product advantages of C27400 copper rod:
I. Production process
1. Melting and continuous casting technology
Adopting advanced large-tonnage electric furnace smelting technology, directly using scrap copper for smelting, combined with submerged liquid transfer and multi-head multi-stream horizontal continuous casting process, efficient production is achieved. This technology has less metal loss and less environmental pollution, and a single device can simultaneously continuously cast 64 products of different specifications, and the production efficiency is more than 10 times higher than that of traditional processes. In addition, some processes use continuous extrusion (such as continuous extrusion of copper wire rods) to replace traditional hot extrusion to shorten the process.
2. Forming and processing
Hot processing and annealing: The hot processing temperature range is 820~870℃, the annealing temperature is 600~700℃, and low-temperature annealing (260℃) is used to eliminate internal stress.
Red punching process: After the copper rod is cut, it is heated to 800℃ by natural gas for red punching, and then annealed to remove the oxide scale, and finally machined and polished.
Surface treatment: including polishing, sawing, straightening and other steps to ensure surface smoothness and dimensional accuracy.
3. Environmental protection and automation
During the production process, a bag dust removal system is used to control the dust concentration below 10mg/L and reduce unorganized emissions. At the same time, computer control technology is widely used to achieve continuous and automated production and improve quality stability.
2. Product advantages
Excellent mechanical properties
Tensile strength can reach 295~630 MPa (depending on the state), elongation ≥10%~35%, with high strength and good plasticity.
It has good plasticity in both hot and cold states, suitable for complex forming such as deep drawing and bending.
Corrosion resistance
It shows high corrosion resistance in the atmosphere, fresh water and seawater, and is suitable for marine engineering and humid environments.
Easy to process
Excellent cutting performance, can be efficiently processed by turning, drilling and other machining.
Supports a variety of processing states (such as soft, hard, semi-hard) to meet different application needs.
Economical and widely used
High zinc content (CuZn37 alloy), low material cost, outstanding cost performance.
Applicable to the manufacture of pins, rivets, radiator parts, pressure gauge springs and other structural parts, covering electronics, hardware, machinery and other fields.
Environmental protection and quality assurance
The use of scrap copper recycling technology is in line with the trend of resource recycling.
Non-destructive testing technology and strict testing process ensure the intrinsic quality and surface finish of the product.
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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