CW705R high tensile brass pipes are made from CuZn25Al5Fe2Mn2Pb, a high tensile aluminium brass 0.2 to 0.8% lead to help machining. The tensile strength of the alloy is about 620-650 MPa and its hardness is between 170 and 200 HB. It makes this alloy suitable for use in parts subjected to heavy loads, friction, and mechanical stress. The role of aluminum in this alloy is improving the surface protection, iron and manganese improve the tensile strength and stability. CW705R is suitable for bushes, gear wheels, valve seats, and hydraulic components. Amardeep Steel supplies CW705R brass pipes and hollow bars with EN 10204 3.1 certificates.
Technical Data
Specifications of Cw705r Low Lead Brass Pipes
| Parameter | Specification |
|---|---|
|
Material |
CuZn25Al5Fe2Mn2Pb, EN CW705R (high tensile aluminium brass) |
|
Standard Specifications |
EN 12163 (Rod/Bar), EN 12165 (Forging Stock), EN 12420 (Forgings), EN 12168 (hollow rod) |
|
Available Forms |
Extruded hollow bar, heavy-wall pipe to drawing, solid round rod, forging billets |
|
Outside Diameter |
20 mm to 120 mm |
|
Inside Diameter |
10 mm to 80 mm |
|
Length |
Up to 3 m or 4 m, or cut to length |
|
Delivery Temper |
R620 / H170 (Standard Tensile) or R650 / H190 (High Strength) |
|
Quality Testing |
Chemical analysis, tensile, Brinell hardness, dimensional check, ultrasonic sound testing on request |
|
Mill Documentation |
EN 10204 3.1 certificate detailing heat chemistry and mechanical test results |
Chemical Compositions of Cw705r Low Lead Brass Pipes
| Element | CW705R (%) |
|---|---|
|
Copper (Cu) |
65.0 to 68.0 |
|
Aluminium (Al) |
4.0 to 5.0 |
|
Iron (Fe) |
0.5 to 3.0 |
|
Manganese (Mn) |
0.5 to 3.0 |
|
Lead (Pb) |
0.2 to 0.8 |
|
Nickel (Ni), max |
1.0 |
|
Tin (Sn), max |
0.2 |
|
Total Impurities, max |
0.3 |
|
Zinc (Zn) |
Remainder |
Cw705r Low Lead Brass Pipes Mechanical Properties
| Temper Designation | Tensile Strength Rm, min (MPa) | 0.2% Proof Strength Rp0.2, min (MPa) | Elongation A, min (%) | Hardness Range (HBW) |
|---|---|---|---|---|
|
R620 / H170 |
620 |
360 |
12 |
170 to 200 |
|
R650 / H190 |
650 |
400 |
10 |
190 min |
Physical and Fabrication Properties of Cw705r Low Lead Brass Pipes
| Property | Metric Value | Imperial Value |
|---|---|---|
|
Density |
8.20 g/cm³ |
0.296 lb/in³ |
|
Melting Range |
860 to 900°C |
1580 to 1652°F |
|
Electrical Conductivity |
8% to 10% IACS |
8% to 10% IACS |
|
Thermal Conductivity |
~35 to 45 W/m·K |
~20 to 26 Btu/ft·h·°F |
|
Coefficient of Thermal Expansion |
~18.5 x 10⁻⁶ /K |
~10.3 x 10⁻⁶ /°F |
|
Modulus of Elasticity |
~110 GPa |
~15,950 ksi |
|
Machinability Rating |
~50 to 60 (C36000 = 100) |
Carbide tooling recommended |
|
Hot Formability |
Good (Optimum temperature: 680 to 760°C) |
Good |
|
Cold Formability |
Poor (Duplex phase with hard intermetallics) |
Limited |
Equivalent Grades of Cw705r Low Lead Brass Pipes
| System / Standard | Designation / Equivalent |
|---|---|
|
EN / Material Number |
CuZn25Al5Fe2Mn2Pb / CW705R |
|
DIN (Former) |
CuZn25Al5 / 2.0598 |
|
UNS / ASTM (Wrought) |
No direct wrought match (Closest compositional match: UNS C86300 cast manganese bronze) |
|
BS (Former) |
High tensile brass class (No exact direct 1:1 BS standard code) |
Machining & Tooling Properties of Cw705r Low Lead Brass Pipes
| Machining Operation | Cutting Tool Material | Cutting Speed (m/min) | Feed Rate (mm/rev) | Recommended Cutting Fluid |
|---|---|---|---|---|
|
Turning (Roughing) |
Carbide (ISO K10–K20) |
80 to 120 |
0.20 to 0.40 |
Dry or Water-Soluble Oil |
|
Turning (Finishing) |
Carbide (K05) / PCD |
120 to 180 |
0.05 to 0.15 |
Emulsifiable Synthetic Coolant |
|
Boring (Hollow Bar) |
Carbide with Positive Rake |
60 to 100 |
0.10 to 0.25 |
Flood Cooling |
|
Drilling |
HSS-Co (Cobalt) or Carbide |
30 to 50 |
0.08 to 0.20 |
High-Pressure Soluble Oil |
|
Tapping / Threading |
Ground Thread HSS-Co |
8 to 15 |
Pitch Dependent |
Heavy Duty Cutting Oil |
Applications and Industrial Uses of Cw705r Low Lead Brass Pipes
- Heavy-duty industrial bushes and bearings
- Gear wheels and worm wheels
- High-pressure hydraulic cylinder components
- Industrial valve seats and valve components
- Marine propulsion system components
- Heavy-load shaft sleeves and wear rings
- Construction and mining machinery components
- Industrial pump wear plates and housings
Frequently Asked Questions
1. What are CW705R brass pipes?
CW705R brass pipes are high tensile aluminium brass products offering excellent strength, hardness, and wear resistance for demanding industrial applications.
2. What is the lead content in CW705R brass?
CW705R brass contains approximately 0.2 to 0.8% lead to improve machinability.
3. What is the tensile strength of CW705R brass?
CW705R brass has a tensile strength of approximately 620 to 650 MPa.
4. What is the difference between CW705R and CW704R brass?
CW705R contains a controlled lead addition to improve machinability, while CW704R is a high tensile aluminium brass grade without the same intentional lead addition.
5. Is CW705R brass suitable for high pressure applications?
Yes, its high strength and hardness make it suitable for demanding hydraulic components and industrial equipment, subject to design requirements.
6. Is CW705R brass suitable for marine applications?
Yes, CW705R offers good strength, wear resistance, and corrosion resistance for suitable marine components.
7. Is CW705R a low lead brass?
No. CW705R contains 0.2 to 0.8% lead to improve machining and is primarily selected for its strength and wear resistance.
8. What is the hardness of CW705R brass?
CW705R has a hardness of 170 to 200 HB in H170 condition and at least 190 HB in H190 condition.
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