I know you’re probably looking for more information about CW617N-Brass.
A reason this guide will answer all questions you have been asking about CW617N-Brass.
So, keep reading to learn more.
- How Is CW617N-Brass Used As Stamping Brass?
- What Is Dezincification Of CW617N-Brass?
- What Are The Two Classifications Of Brass?
- What Is The Chemical Composition Of CW617N-Brass?
- Is There Any Regulation Prohibiting The Use Of Dezincification Resistant Brass Alloys In Contact With Potable Water?
- What Are The Physical Properties Of CW617N-Brass?
- What Are The Applications Of Cw617n-brass?
- What Are The Fabrication Properties Of CW617N-Brass?
- What Are The Advantages Of CW617N-Brass?
- What Are The Joining Methods Of CW617N-Brass?
- What Are The Types Of Corrosion On CW617N-Brass?
- What Are The Surface Treatment Methods For CW617N-Brass?
How Is CW617N-Brass Used As Stamping Brass?
Hot stampings are made by establishing a solid billet of hot material that is placed between two die halves.
The die design ensures the component produced is extremely close in size compared to the actual product.
Metal stamping utilizes various metals to come up with parts that are exceptionally accurate and have repeatability.
It is important to consider the application as well as the metal stamping process compatibility when choosing a stamped part metal material.
Factors like machinability, tensile strength and ductility majorly influence the ability of the metal to be formed and shaped precisely without loss of strength or breakage.
In as much as it is free from machining, it is majorly supplied for forging stock as rod.
It is composed of 59% copper and 39% zinc. The microstructure also has 2% additional lead that is dispersed finely throughout.
The CW617N-Brass has an outstanding mix of machining properties and hot working properties. This makes it suitable for producing very complex components that are hot pressed.
Many companies utilize the CW617N-Brass stamping when cosmetic appeal of a product is required. This is because of its tarnish resistance and its appearance of bright gold-like look.
CW617N-Brass is used in metal stampings in conditions where the friction required should be low with no sparks produced.
It most suitable for heavy artillery ammunition casings, electrical and plumbing appliances.
What Is Dezincification Of CW617N-Brass?
This is a condition whereby zinc is eroded off the surface of CW617N-Brass leaving copper behind.
This leads to copper crystals forming on the surface after the copper rearranges on the brass surface.
The rearrangement is made possible by the attraction of copper on the surface to negative ions found in the normally alkaline solution.
This attraction does not have enough strength to dissolve the copper.
However, it tends to weaken the coppers bind on the CW617N-Brass surface making the copper move around rapidly.
This process normally takes place in moderately mild conditions like solutions that are mildly acidic or alkaline.
In very strong acidic solutions, the zinc and copper are both dissolved leaving the surface lacking the copper enrichment.
Dezincification also takes place in situations where CW617N-Brass is exposed to solutions having chloride ions like sea water.
An example is the exposure of CW617N-Brass doors that have de-icing salt poured on them. The color normally changes from yellow to pink when hydrochloric acid is used to clean it.
Dezincification can be avoided by adding approximately 0.03% of arsenic in the CW617N-Brass.
This addition has been made standard in every alpha brass tube provisions that include Aluminum brass and Admiralty brass.
The alpha brass strips are not normally arsenic because they are mostly applied in circumstances where dezincification is insignificant or does not occur totally.
It causes problems in water fittings made from CW617N-Brass.
This type of dezincification is called ‘meringue dezincification‘ whereby a very heavy mound is formed from the corrosion by zinc. This blocks the passage of fluids.
The beta phase of the CW617N-Brass is preferentially attacked at first before the adjoining alpha phase at a later stage.
Addition of arsenic on alpha-beta alloys add no value since they do not inhibit dezincification.
What Are The Two Classifications Of Brass?
Brass can be classified into two groups:
- Alpha alloys – they contain levels of zinc that are less than 37%. They can be cold worked since they are ductile. They are deformed extensively through cold heading, bending and thread rolling.
- Alpha beta / duplex alloys – they contain between 37%-45% zinc. They are strong and hard hence possesses restricted cold ductility. They are highly workable at increased temperatures and extrusion into complex sections and hot forging very possible.
CW617N-Brass falls under Alpha beta alloys and is mainly used in machining. Its machinability is improved by the addition of lead into its composition.
The soft lead particles in the CW617N-Brass microstructure behave as chip breakers while the lead stays insoluble within the microstructure.
What Is The Chemical Composition Of CW617N-Brass?
- Copper 56-58.5%
- Lead 1.5-2.5%
- Iron 0.3% maximum
- Zinc 39%
Is There Any Regulation Prohibiting The Use Of Dezincification Resistant Brass Alloys In Contact With Potable Water?
CW617N-Brass is not appropriate for immersion in extended periods inside salty or potable water.
This is because the brass alloys undergo extensive corrosion failure.
Most countries prohibit the use of such metals with their lead contents to be used in applications of potable water. Some of the alloys mostly serving as CW617N-Brass replacements
What Are The Physical Properties Of CW617N-Brass?
Some of the main physical properties include:
- Melting Point 895°C
- Density 8.4 g/cm³
- Specific Heat 380 j/Kg°K
- Thermal Conductivity (RT) 117 W/m°K
- Thermal Expansion Coefficient (20-200°) 20 x 10-6
- Electrical Conductivity 27% IACS
- Electrical Resistivity 0.064 ohm mm²/mm
What Are The Applications Of Cw617n-brass?
The commercial uses of the CW617N-Brass include:
- Automotive components including brackets, nuts, gears and clamps
- Specialty fasteners
- Precision machined components
- Architectural hardware and extrusions
- Forged and hot pressed components
- Valve parts
What Are The Fabrication Properties Of CW617N-Brass?
- Hot working temperature range: the optimum temperature for this is 650-775°C. Temperatures should not surpass the set limit on heating before forging. Failure leads to cracks caused by the grain growth of CW617N-Brass during forging.
- Cold formability: this process is suitable in the annealed condition and the hot worked condition. An increase in hardness leads to a decrease in workability. Rivets, screws and similar items use cold forming in their manufacture. Since CW617N-Brass contains a bit of lead, their cold ductility is limited.
- Machinability rating: CW617N-Brass is easy to machine with quality of the surface exceptionally high.
- Soft Annealing temperature range: the range of temperature for this process varies between 500-550°C. It should be carried out between 1-2 hours.
- Stress Relieving Temperature range: the temperature range is 330-350°C within 2-4 hours. This should be carried out when cold working is immediately finished due to the materials residual tensile stress.
What Are The Advantages Of CW617N-Brass?
The main advantages of CW617N-Brass include:
- Excellent Thermoforming properties: due to the fact that it is an alloy containing copper, CW617N-Brass shows an exceptional electrical and thermal conductivity.
- High processability grade and machinability rating: CW617N-Brass has properties like resistance to corrosion, ductility, non-magnetism and exceptional acoustic properties. The versatility in all this enables it to satisfy a variety of distinct material requirements.
- Good corrosion resistance lowers the protective finishing cost. Their exposure to atmosphere leads to formation of superficial tarnish films.
- Decorative appearance: CW617N-Brass has a unique golden bright appearance. This makes it the preferred material of choice for manufacturing ornamental hardware and various stamped components requiring a visual appeal.
- It has a long service life hence CW617N-Brass components that are well designed have minimal failures.
- It has ease of joining: CW617N-Brass can easily be joined to other metals or alloys using regular joining processes like friction welding and soft soldering.
What Are The Joining Methods Of CW617N-Brass??
- Soldering: it is done using either lead/tin or lead free solders together with non-active or active flux. Before soldering, CW617N-Brass should be stress relieved to avoid cracking after contact with sudden heat.
- Brazing: CW617N-Brass is joined using brazing alloys concealed by EN1044. Using flux may cause corrosion if it is left on the component. The flux should be washed off immediately brazing is completed while the component is still hot.
- Fusion welding: the problem with this type of welding is the emission zinc oxide fumes that are caused by the boiling of zinc in the weld pool. This problem is minimized by using the correct filler alloy.
- Gas-shielded arc welding
- Resistance welding (seam and spot): this process makes very good joints between CW617N-Brass components. Guidelines must be sought from the component manufacturer before carrying out resistance welding.
What Are The Types Of Corrosion On CW617N-Brass?
Stress Corrosion Cracking (SCC)
This kind of corrosion only happens in the instantaneous occurrence of high levels of stress in the CW617N-Brass and a medium that is corrosive having moisture and ammonia.
This corrosion type happens when the CW617N-Brass is open to moist conditions. This is enhanced in extreme temperatures with chlorides present.
What Are The Surface Treatment Methods For CW617N-Brass?
- Polishing: It can be carried out using products used to commercially clean copper
- Mechanical surface treatment: these include processes such as polishing, grinding and blasting. These are carried out using the conventional methods.
- Varnishing: by using clear varnish, the surface form obtained after cleaning is retained over a long period.
- Pickling: this is a non-oxidizing process that is carried out at room temperature using diluted sulphuric acid.
- Oxidized Pickling: oxidants like dichromate or peroxide are placed inside a pickling bath and the CW617N-Brass immersed.
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