Copper Alloy C44500
UNS C44500 · EN CW707R
C44500 is an antimony-inhibited Admiralty brass (CW707R), a tin-bearing Cu-Zn wrought alloy in which the inhibitor addition suppresses dezincification in brackish and sea water.
Reference datasheet — C44500 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the O61 condition
C44500 tempers and conditions
C44500 is supplied in 9 conditions, soft to hard. O61 is the default FabDigit quotes; the values on this page are for it.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed to 0.050 mm grain size | Coarser anneal for severe forming/deep drawing where slight orange-peel is acceptable. | 120 | 331 | 66 | 58 HB | 26 % IACS |
O61Default Annealed | Standard supply condition for condenser and heat-exchanger tube; maximum ductility for bending and expanding into tubesheets. | 124 | 331 | 65 | 60 HB | 25 % IACS |
Annealed to 0.025 mm grain size | Fine-grain anneal for sheet/strip needing good surface finish after deep drawing. | 140 | 365 | 60 | 68 HB | 26 % IACS |
Drawn and stress-relieved tube | Preferred for U-bend and ammonia-exposed service: cold-drawn strength with residual stress removed to resist stress-corrosion cracking. | 190 | 400 | 48 | 85 HB | 25 % IACS |
Light drawn tube | Light draw for straightness and slightly higher strength while retaining good expandability in tubesheets. | 195 | 395 | 50 | 85 HB | 25 % IACS |
Drawn, general purpose tube | Cold-drawn tube where higher strength and stiffness are wanted over maximum ductility. | 250 | 425 | 40 | 100 HB | 25 % IACS |
Quarter hard | Lightly rolled sheet/strip for parts needing moderate stiffness plus some remaining formability. | 275 | 395 | 30 | 95 HB | 25 % IACS |
Half hard | Half-hard strip/plate for tubesheet-adjacent parts and formed components requiring higher yield strength. | 345 | 448 | 18 | 120 HB | 25 % IACS |
Full hard | Fully cold-rolled sheet/strip for maximum strength and spring-back; forming limited to gentle bends. | 420 | 517 | 8 | 145 HB | 24 % IACS |
Supply forms, finishes and certifications
Ways C44500 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
WO50 | Welded tube, annealed | Surface finish |
What is C44500?
C44500 is an antimony-inhibited Admiralty brass (CW707R), a tin-bearing Cu-Zn wrought alloy in which the inhibitor addition suppresses dezincification in brackish and sea water. In the annealed condition it runs 124 MPa yield, 331 MPa tensile and 65% elongation at about 60 HB with 25% IACS conductivity, and it is supplied mainly as seamless and welded tube, plus strip in tempers from O61/OS050 through H04. Strength is low, free-machining rating is only about 30% of C36000, and cold-worked parts must be stress relieved to avoid ammonia stress-corrosion cracking; where flow velocities or ammonia exposure are high, 90/10 copper-nickel is the usual alternative. C44500 has a density of 8.53 g/cm³ (0.308 lb/in³), lighter than 62% of copper alloy grades. It melts at 900°C (1,652 °F). C44500 has a yield strength of 124 MPa (18 ksi) and a tensile strength of 331 MPa (48 ksi) — weaker than 78% of copper alloy grades. Elongation at break is 65% and the elastic modulus is 110 GPa (16 Msi).
What is C44500 used for?
- condenser tubes
- heat exchanger tubes
- marine piping
Advantages
- Ductile — tolerates forming and impact — 65%, better than 100% of copper alloy grades
- Forms and bends easily — 92/100, better than 91% of copper alloy grades
Limitations
- Low strength — 124 MPa (18 ksi), worse than 78% of copper alloy grades
C44500 properties
Typical room-temperature values for C44500-O61; bars are the position among copper alloy grades.
Physical3
C44500 has a density of 8.53 g/cm³ (0.308 lb/in³), lighter than 62% of copper alloy grades. It melts at 900°C (1,652 °F).
Mechanical13
C44500 has a yield strength of 124 MPa (18 ksi) and a tensile strength of 331 MPa (48 ksi) — weaker than 78% of copper alloy grades. Elongation at break is 65% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
C44500 is rated for continuous service to 200°C (392 °F). It conducts heat at 111 W/m·K (64.1 BTU/hr·ft·°F), better than 59% of copper alloy grades. Thermal expansion is 20.2 µm/m·K (11.2 µin/in·°F).
Electrical3
C44500 conducts electricity at 25 % IACS, better than 59% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C44500 takes about 58 MJ of energy and emits 3.8 kg of CO₂ — more than 61% of copper alloy grades. Typical recycled content is 40%.
Manufacturability7
C44500's machinability is fair (35/100, better than 51% of copper alloy grades); weldability good (55/100); formability excellent (92/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. C44500 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C44500
Is C44500 easy to machine?
Free-machining rating only ~30% of C36000 — gummy chips; use sharp positive-rake tools, high speed, generous coolant and chip-breaking geometry.
Can C44500 be welded?
Solders and brazes excellently; GTAW/oxyfuel possible with silicon-bronze filler but zinc fuming and porosity make fusion welding a last resort; welded tube is made by high-frequency seam welding plus anneal.
Can C44500 be formed, bent or molded?
Excellent cold formability in O61 — bending, expanding, U-bending and deep drawing are routine; always stress-relieve (about 275–300 °C) after severe cold work to avoid ammonia SCC.
C44500 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Cuincludes Ag per ASTM | 70 – 73 | 71 |
| Snerosion/dezincification resistance | 0.9 – 1.2 | 1.05 |
| Pdezincification inhibitor (Admiralty D) | 0.02 – 0.1 | 0.05 |
| Pb | ≤ 0.07 | |
| Fe | ≤ 0.06 | |
| Znremainder ~28% | balance |
What surface finishes work on C44500?
Not anodizable; finish by pickling/bright dip, mechanical polishing, tin or nickel plating; in service a protective FeOOH/Cu-Sn film is often promoted by ferrous-sulfate dosing.
Surface treatments FabDigit runs on copper alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Equivalent designations
Standards and trade names that resolve to Copper Alloy C44500 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CW707R
How much does C44500 cost?
C44500 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
C44500 — frequently asked
What is C44500 used for?
C44500 is typically used for condenser tubes, heat exchanger tubes and marine piping. In short: dezincification-inhibited Admiralty brass; marine condenser tube grade; very high cold formability.
What is the yield strength of C44500?
C44500 has a typical yield strength of 124 MPa (18 ksi) and a tensile strength of 331 MPa (48 ksi) — weaker than 78% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is C44500 easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of copper alloy grades). Free-machining rating only ~30% of C36000 — gummy chips; use sharp positive-rake tools, high speed, generous coolant and chip-breaking geometry.
Can C44500 be welded?
Yes — weldability is rated good (55/100). Solders and brazes excellently; GTAW/oxyfuel possible with silicon-bronze filler but zinc fuming and porosity make fusion welding a last resort; welded tube is made by high-frequency seam welding plus anneal.
What surface finishes work on C44500?
Not anodizable; finish by pickling/bright dip, mechanical polishing, tin or nickel plating; in service a protective FeOOH/Cu-Sn film is often promoted by ferrous-sulfate dosing.
Can C44500 be formed, bent or molded?
Excellent cold formability in O61 — bending, expanding, U-bending and deep drawing are routine; always stress-relieve (about 275–300 °C) after severe cold work to avoid ammonia SCC.
What is the maximum service temperature of C44500?
C44500 is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C44500-O61 and C44500-H04?
O61 is the default condition — standard supply condition for condenser and heat-exchanger tube; maximum ductility for bending and expanding into tubesheets. H04: fully cold-rolled sheet/strip for maximum strength and spring-back; forming limited to gentle bends. Yield strength is 124 MPa in O61 versus 420 MPa in H04.
How much does C44500 cost?
C44500 is a high-cost copper alloy ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM B111/B111M — Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock — ASTM International (2021)
- ASTM B171/B171M — Copper-Alloy Plate and Sheet for Pressure Vessels, Condensers and Heat Exchangers — ASTM International (2018)
- ASTM B395/B395M — U-Bend Seamless Copper and Copper Alloy Heat Exchanger Tubes — ASTM International (2022)
- CDA Alloy Database — C44500 (Phosphorized Admiralty) — Copper Development Association / copper.org (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials (Copper Alloys in Seawater) — ASM International (2005)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.