.webp "C28000 60/40 Muntz Metal Tubes (CuZn40)")
Muntz metal is the brass you choose when a part has to be heated and hit. C28000 60/40 Muntz metal tubes carry about 60 parts copper to 40 parts zinc, and on European drawings you will see the same alloy written CuZn40. That much zinc gives the metal a mixed structure, which is why it forges and hot presses so readily and why it costs less than most brasses with a higher copper content.
Amardeep Steel Centre supplies C28000 brass tube from Mumbai, as a Muntz metal tube supplier in India and for export buyers. Send us the outside diameter, wall thickness, length, temper and quantity on our enquiry page and we will tell you what we can ship and when
Technical Data
C28000 Brass Tube Specifications at a Glance
| Parameter | Detail |
|---|---|
|
Grade |
C28000, 60/40 Muntz metal, CuZn40 |
|
UNS designation |
C28000, also written CDA 280 |
|
Standards |
ASTM B135 for seamless brass tube, ASTM B111 for condenser tube and ferrule stock, ASTM B251 general requirements, Federal specification WW T 791 |
|
Product forms |
Round tube supplied against your drawing |
|
Size range |
Outside diameter and wall thickness to your drawing. Send the sizes and we confirm. |
|
Length |
Random, fixed or cut to length |
|
Tempers |
ASTM B135 tempers, confirmed at quotation |
|
Tolerance |
As per the standard on your order, or as agreed |
|
Lead content |
0.30 per cent maximum. Not a lead free alloy. |
|
Testing and certificates |
Mill test certificate, type confirmed at quotation |
Chemical Composition and What Each Element Does
| Element | UNS C28000 | Nominal | What it does |
|---|---|---|---|
|
Copper (Cu) |
59.0 to 63.0 |
About 60 |
The base of the alloy |
|
Zinc (Zn) |
Remainder |
About 40 |
Gives the two phase structure, strength and hot workability |
|
Lead (Pb) |
0.30 maximum |
None added |
Residual limit. This is not a free cutting grade. |
|
Iron (Fe) |
0.07 maximum |
None added |
Impurity limit |
Physical Properties of C28000 in SI Units
| Property | SI value | Imperial value |
|---|---|---|
|
Density |
8.39 g/cm3 |
0.303 lb/in3 at 68 F |
|
Melting range |
899 to 904 degrees Celsius, solidus to liquidus |
1650 to 1660 F |
|
Coefficient of thermal expansion |
About 20.9 micrometres per metre per kelvin, 20 to 300 degrees Celsius |
11.6 millionths per F, 68 to 572 F |
|
Thermal conductivity |
About 123 W/m K at 20 degrees Celsius |
71.0 Btu per foot per hour per F |
|
Electrical conductivity |
28 per cent IACS at 20 degrees Celsius |
28 per cent IACS at 68 F |
|
Electrical resistivity |
About 0.0615 micro ohm metre |
37.0 ohm circular mil per foot |
|
Specific heat |
About 377 J/kg K |
0.09 Btu per pound per F |
|
Modulus of elasticity in tension |
About 103 GPa |
15000 ksi |
|
Modulus of rigidity |
About 39 GPa |
5600 ksi |
Application of C28000 60/40 Muntz Metal Tubes
- Heat exchanger and evaporator tube: Muntz metal heat exchanger tube works in non seawater duty, where the water has been checked and the velocity is moderate.
- Valve stems and hardware: Parts hot pressed or forged from tube, then finished to size.
- Hot pressed and forged parts: Blanks and shapes that need the metal to flow under heat.
- Architectural trim: Rails, tubing and decorative metalwork where the warmer, golden colour of Muntz metal is wanted.
- Brazing stock: Tube cut and used as filler or as a joined component, since it solders and brazes well.
If your duty involves seawater or fast cooling water, this is the wrong page. See our admiralty brass seamless tube, aluminium brass seamless tube and copper nickel 90 10 pipes and tubes ranges.
Frequently Asked Questions
What is C28000 60/40 Muntz metal tube?
C28000 is Muntz metal, a brass with about 60 per cent copper and 40 per cent zinc, also written CuZn40. Its two phase structure gives it good strength and very good hot forming. It is supplied as tube for heat exchanger work in suitable water, hot pressed parts and hardware.
What does 60/40 mean, and how is it different from 63/37 brass?
The numbers are the nominal copper and zinc percentages. At 40 per cent zinc the alloy has a mixed alpha and beta structure, so it is stronger and hot forms more readily than 63/37 yellow brass. It is less ductile when cold worked, so it suits hot forming more than deep drawing.
Is C28000 lead free?
No. The standard allows lead up to 0.30 per cent maximum, and no lead is added on purpose. It is not sold as lead free brass, and it is not the leaded Muntz metal C36500. For lead restricted work, ask us for a lower lead brass and tell us the regulation you must meet.
What is the difference between Muntz metal and naval brass?
Naval brass has a similar 60 per cent copper base but adds 0.5 to 1.0 per cent tin. The tin slows dezincification, so naval brass holds up better in seawater and marine hardware. Muntz metal has no tin and costs less, so it suits hot forming and dry or mild service.
Is C28000 suitable for seawater or condenser tube?
We do not recommend it for seawater or fast cooling water. With no tin and a two phase structure it can dezincify in many waters. For marine or condenser duty, ask for naval brass, admiralty brass, aluminium brass or copper nickel. Tell us the water and the service, and we will advise.
Which standards cover C28000 tube?
ASTM B135 covers seamless brass tube including C28000, and B111 covers condenser tube and ferrule stock. B251 gives the general requirements, and WW T 791 is the US federal specification. Name the standard and temper on your order so tolerances and tests match your drawing.
Enquire About Muntz Metal Tube in C28000
Tell us the size, the temper and the quantity, and what the tube has to do. We will come back with a price, a delivery date and a straight view on whether Muntz metal is the right brass for the job, and if it is not, we will say so. You can attach your drawing to the enquiry.
Get EnquiryRelated Brass and Copper Alloy Products
- Pipes and tubes lists the full pipe and tube range.
- Copper nickel and brass products covers every copper nickel and brass range.
- Admiralty brass seamless tube is an inhibited brass tube for condenser duty.
- Aluminium brass seamless tube is a brass tube for seawater heat transfer.
- Copper nickel 90 10 pipes and tubes are the choice for aggressive water and high flow.
- Brass round bars to IS 319 1989 Gr.1 are free cutting bar for machining.
