CNC Machined Brass & Copper Products

Brass is an alloy composed of copper and zinc; whereas special brass is a variety of alloys composed of two or more elements. Brass has relatively strong abrasion resistance and is often used in the manufacture of valves, water pipes, connectors for pipes for air conditioners and radiators, and lots more.

At Weimi Hardware, our brass products are mostly used for water pipes and valve fittings and we have many clients within this industry. Water pipe fastening parts range from 2-3 series to as many as ten or twenty series.

The picture above shows the 8 series product of one of our customers where three components are a set (nut, stem and socket). Brass is a brittle material, easy to cut and process, but the difficult part of the project is that the socket is made as a non-standard, left-handed thread and there are no solid parts.

The Weimi team successfully produced the thread gauge and our customer was very satisfied with the finished product. Some product sizes have precision tolerances of + 0.03 / -0, -0.05 / + 0 (mm),

This image shows parts made from red copper – these are very commonly produced by Weimi.

The picture is one of our copper products that has been made through a combination of turning and milling processes. If you have similar products or are interested in a quote, you can contact us at any time and we will be more than happy to help.

 

Red copper is also known as pure copper – it is a simple substance that is named for its purple-red color.

Properties of red copper: melting point of 1083°C, no isomeric transformation, and a relative density of 8.9 (5 times that of magnesium).

The mass of the same volume of red copper is about 15% heavier than ordinary steel. It also has a rose red and purple color. If the copper contains oxygen, we call it oxygen-containing copper.

Red copper has a good electrical and thermal conductivity, excellent plasticity, and is easily processed by hot and cold pressure. It is widely used in the manufacture of wires, cables, brushes, electric sparks, and other products that require good electrical conductivity.

 

The difference between copper and brass —

 

1. Appearance

Brass: pale golden yellow, shiny.

Copper: Rose red, shiny.

 

2. Composition

Copper: copper content around 99.9%.

Brass: around 60% copper; 40% zinc; some brands also contain about 1% lead which is due to contamination.

 

3. Intensity

Brass: higher.

Copper: lower.

 

4. Density and usage

The density of brass (8.93g / cm3) is multi-purpose and wear-resistant. Brass castings are commonly used to make valves and pipe fittings. The use of ordinary brass is extremely extensive, but is sometimes used in the manufacture of water tank belts, water supply and drainage pipes, medals, corrugated pipes, serpentine pipes, condenser pipes, cartridge cases, and various complex shapes of punched products and small hardware.

Copper: pure copper has a density of 7.83g / cm3, melting point of 1083°C, and is non-magnetic. It has good electrical and thermal conductivity, corrosion resistance, and toughness.

 

5. Conductivity

Brass: Lower.

Copper: Higher.

 

6. Corrosion resistance

Brass: Poor.

Copper: Good.

 

7. Cutting performance

Brass: Good.

Copper: Poor.

(Please note there are other copper types, but as these are not commonly used in the machining industry we will not go into further detail on their usage or properties.)

 

Copper surface: Copper is susceptible to oxidation because as it’s a non-ferrous metal, i.e. it easily reacts with oxygen in the air to form copper oxide.

Products that can be passivated will have color differences and have a short anti-oxidation time (membrane oxidation is a popular effect).

 

How does it work?

The anti-oxidation working fluid penetrates into the gaps on the surface of copper ions (thin, unrecognizable to the naked eye), and then cleans the copper surface to prevent oxidation. The working liquid can be dried on the surface of the copper material. The anti-oxidation liquid forms a uniform protective film between the copper ion gaps, that can effectively isolate the oxygen in the air, thereby effectively preventing the oxidation and discoloration of copper.

Advantages of this process: durable oxidation time, low cost, bright color, no influence on conductive properties, soldering properties, or performance.

 

We hope that you found this information helpful. Depending on the material properties and your needs, we can help you make the right material choice for your next project! We can also produce samples of various materials for your choosing depending on your product specifications.

Contact us at info@cncmanufacturing.net to find out more.

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