C69300 eco brass hollow bars are what the drawing calls for when a valve or plumbing body needs to be forged or machined and then carry water in a lead-free manner. C69300 is the UNS number for this kind of silicon brass, but eco brass is a name commonly used by many buyers. The lead is held to 0.09 per cent maximum. That is very low, but it is not zero, and it helps to know the difference before you order.
Amardeep Steel Centre supplies C69300 brass hollow bar from Mumbai, as a C69300 hollow bar supplier in India and for export buyers. Send the outside diameter, bore, length, temper and quantity on the enquiry page and Amardeep Steel Centre replies with what can be shipped and when.
Technical Data
C69300 Hollow Bar Specifications at a Glance
| Parameter | Detail |
|---|---|
|
Grade |
C69300, silicon brass, sold as eco brass |
|
UNS designation |
C69300 |
|
Standards |
ASTM B371 for copper zinc silicon alloy rod, bar and shapes, confirmed against your order for hollow bar |
|
Product forms |
Hollow bar and hollow rod supplied against your drawing |
|
Size range |
Outside diameter, bore and wall to your drawing. Send the sizes and we confirm. |
|
Length |
Random, fixed or cut to length |
|
Tempers |
As named on your drawing, confirmed at quotation |
|
Tolerance |
As per the standard on your order, or as agreed |
|
Lead content |
0.09 per cent maximum. Very low lead, not zero lead. |
|
Testing and certificates |
Mill test certificate, type confirmed at quotation |
Chemical Composition of C69300 Bars
| Element | ASTM B371 C69300 |
|---|---|
|
Copper (Cu) |
73.0 to 77.0 |
|
Zinc (Zn) |
Remainder |
|
Silicon (Si) |
2.7 to 3.4 |
|
Phosphorus (P) |
0.04 to 0.15 |
|
Lead (Pb) |
0.09 maximum |
|
Iron (Fe) |
0.10 maximum |
|
Tin (Sn) |
0.20 maximum |
|
Nickel (Ni), including cobalt |
0.10 maximum |
|
Manganese (Mn) |
0.10 maximum |
Mechanical Properties of C69300 Eco Brass Hollow Bars
| Size range | Tensile, min | Yield, min | Elongation, min | Rockwell B, max |
|---|---|---|---|---|
|
Up to 12.7 mm (0.5 in) |
585 MPa (85 ksi) |
310 MPa (45 ksi) |
5 per cent |
85 |
|
Over 12.7 to 25.4 mm (0.5 to 1 in) |
515 MPa (75 ksi) |
240 MPa (35 ksi) |
10 per cent |
80 |
|
Over 25.4 to 63.5 mm (1 to 2.5 in) |
480 MPa (70 ksi) |
205 MPa (30 ksi) |
10 per cent |
75 |
Physical Properties of C69300 in SI Units
| Property | SI value | Imperial value |
|---|---|---|
|
Density |
8.3 g/cm3 at 20 degrees Celsius |
0.30 lb/in3 |
|
Solidus |
About 855 degrees Celsius |
1571 F |
|
Liquidus |
About 880 degrees Celsius |
1616 F |
|
Coefficient of thermal expansion |
About 18 micrometres per metre per kelvin, 20 to 300 degrees Celsius |
10.4 millionths per F |
|
Thermal conductivity |
About 37.8 W/m K |
21.8 Btu per square foot per foot per hour per F |
|
Electrical conductivity |
About 8 per cent IACS |
8 per cent IACS |
|
Specific heat |
About 377 J/kg K |
0.09 Btu per pound per F |
|
Modulus of elasticity in tension |
About 105 GPa |
15200 ksi |
C69300 Equivalent Grades and Standards
| System | Designation | Note |
|---|---|---|
|
UNS |
C69300 |
Primary designation |
|
ASTM |
B371 rod, bar and shapes |
The standard named for the grade |
|
EN |
CW724R, CuZn21Si3P |
Nearest match, limits written differently |
Application of C69300 Eco Brass Hollow Bars
- Valve bodies and stems: Bodies and stems forged or machined from hollow stock, with the bore already through.
- Faucet and plumbing parts: Faucet bodies, stems and plumbing fittings for water supply.
- PEX fittings: Fittings used with PEX plumbing systems.
- Stop valves and ball valves: Valve bodies and trim that carry water.
- Water meter cases: Meter bodies and connectors for potable water.
- Pneumatic and automotive fittings: Fluid connectors, sensor bodies and pneumatic fittings turned from bar.
If the duty involves seawater, 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 are C69300 eco brass hollow bars?
C69300 is a silicon brass with about 75 per cent copper, 2.7 to 3.4 per cent silicon and a lead limit of 0.09 per cent maximum, sold as eco brass for water and plumbing parts. Hollow bar is stock with a bore through it, used for machined and forged valve and fitting parts.
What is eco brass?
Eco brass is the trade name for C69300, a copper zinc silicon alloy that uses silicon in place of lead to help machining. The name is also a registered brand of another maker, so we describe the grade by its UNS number, C69300. Ask us for the composition and certificate for your lot.
Is C69300 lead free?
Strictly, no. C69300 is very low lead, with a maximum of 0.09 per cent, and some suppliers call it lead free. Drinking water rules depend on your region and the finished part, so check yours. We make no compliance claim and no approval claim without a certificate.
How does C69300 differ from ordinary brass?
Ordinary brass is copper and zinc, and free cutting brass adds lead for machining. C69300 adds silicon and a little phosphorus instead, and holds lead very low. It machines about 85 on the C36000 scale, but cold works poorly. Choose it for hot forged and machined water parts.
Is C69300 the same as CW724R?
They are nearest matches. C69300 is the UNS grade, CW724R is the European code, and the limits are written in different standards. Check your drawing before substituting, and use C69300 on purchase orders. We compare the limits for you.
Which standard covers C69300 hollow bar?
C69300 is named under ASTM B371 for copper zinc silicon rod, bar and shapes. Name the standard, temper and tolerance on your order so tests match your drawing, and we confirm what applies to hollow bar. Tell us if your drawing names a different standard.
Looking to Enquire or Place an Order?
Tell Amardeep Steel Centre the size, the temper and the quantity, and what the part has to do. You get a price, a delivery date and a straight view on whether C69300 is the right brass for the job, and if it is not, we say so. You can attach your drawing to the enquiry.
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