Copper Alloy C44300
UNS C44300 · ASTM B111 · EN CuZn28Sn1As, CW706R · JIS C4430 · GB HSn70-1AS
C44300 is an arsenical admiralty brass (Cu-28Zn-1Sn with a trace arsenic inhibitor) supplied to ASTM B111 and equivalent to CuZn28Sn1As / CW706R and HSn70-1AS.
Reference datasheet — C44300 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
C44300 tempers and conditions
C44300 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-grain annealed sheet/plate for deep drawing and severe cold forming of tubesheet or shell parts. | 117 | 331 | 65 | 68 HB | 25 % IACS |
O61Default Annealed | Standard condenser/heat-exchanger tube condition — maximum ductility for expanding into tubesheets and U-bending. | 125 | 340 | 65 | 70 HB | 25 % IACS |
Annealed to 0.025 mm grain size | Fine-grain annealed strip/plate for shallow forming and best surface after finishing. | 140 | 350 | 60 | 75 HB | 25 % IACS |
Light drawn tube | Light draw for straighter, stiffer tube that still expands into tubesheets; common alternative to O61. | 205 | 385 | 50 | 90 HB | 25 % IACS |
Light drawn and stress relieved tube | Choose when residual stress must be lowered to avoid ammonia/steam-side stress-corrosion cracking in drawn tube. | 215 | 390 | 48 | 92 HB | 25 % IACS |
Drawn, general purpose tube | General-purpose drawn tube where moderate strength and good straightness matter more than expandability. | 230 | 400 | 45 | 100 HB | 25 % IACS |
Quarter hard | Quarter-hard strip/sheet balancing stiffness with residual bending and forming ability. | 275 | 400 | 40 | 100 HB | 25 % IACS |
Half hard | Half-hard sheet/strip for baffles, spacers and lightly formed corrosion-resistant parts. | 345 | 450 | 30 | 120 HB | 25 % IACS |
Hard drawn | Maximum strength drawn tube for pressure-carrying or structural service; not for tube expanding or tight bends. | 350 | 480 | 25 | 130 HB | 24 % IACS |
What is C44300?
C44300 is an arsenical admiralty brass (Cu-28Zn-1Sn with a trace arsenic inhibitor) supplied to ASTM B111 and equivalent to CuZn28Sn1As / CW706R and HSn70-1AS. Tin plus arsenic suppress dezincification and impingement attack in seawater and steam, so the alloy is used mainly as seamless condenser tube in O61/OS annealed tempers and H55–H80 drawn tempers. Annealed properties are 125 MPa yield, 340 MPa tensile, 65 % elongation and 70 HB, with 25 % IACS conductivity and 200 °C maximum service temperature. Machinability is about 30 % of free-cutting brass and the alloy is ammonia-SCC sensitive; for rod and forgings choose naval brass C46400/C46500. C44300 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). C44300 has a yield strength of 125 MPa (18.1 ksi) and a tensile strength of 340 MPa (49.3 ksi) — weaker than 77% of copper alloy grades. Elongation at break is 65% and the elastic modulus is 110 GPa (16 Msi).
What is C44300 used for?
- condenser and heat exchanger tubes
- feedwater heater tubes
- marine tubing
Advantages
- Ductile — tolerates forming and impact — 65%, better than 100% of copper alloy grades
- Forms and bends easily — 90/100, better than 89% of copper alloy grades
Limitations
- Low strength — 125 MPa (18.1 ksi), worse than 77% of copper alloy grades
C44300 properties
Typical room-temperature values for C44300-O61; bars are the position among copper alloy grades.
Physical3
C44300 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
C44300 has a yield strength of 125 MPa (18.1 ksi) and a tensile strength of 340 MPa (49.3 ksi) — weaker than 77% of copper alloy grades. Elongation at break is 65% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
C44300 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
C44300 conducts electricity at 25 % IACS, better than 59% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), better than 76% of copper alloy grades.
Sustainability4
Producing a kilogram of C44300 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C44300's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability fair (45/100); formability excellent (90/100).
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. C44300 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C44300
Is C44300 easy to machine?
Machinability ~30% of free-cutting brass — gummy, low-lead chips; use sharp positive-rake tools, high speed, generous coolant.
Can C44300 be welded?
Fair weldability: prefer brazing or soldering; if welded use GTAW with Cu-Si/Cu-Sn filler, low heat input, and extract zinc fume.
Can C44300 be formed, bent or molded?
Excellent cold formability in O61/OS tempers (expanding, U-bending, drawing); stress relieve drawn tube at 250–300 °C to avoid ammonia SCC.
C44300 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 |
|---|---|---|
| Cu | 70 – 73 | 71.5 |
| Sn | 0.9 – 1.2 | 1.05 |
| Asdezincification inhibitor | 0.02 – 0.06 | 0.04 |
| Pb | ≤ 0.07 | |
| Fe | ≤ 0.06 | |
| Znremainder, nominally ~28% | balance |
What surface finishes work on C44300?
Solders and brazes readily; not anodizable — protect with benzotriazole inhibitor, tin/nickel plating, or clear lacquer; polishes to bright yellow finish.
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 C44300 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B111
- EN / DIN / Werkstoff-Nr.
- CuZn28Sn1AsCW706R
- GB (China)
- HSn70-1AS
- JIS
- C4430
- Similar grades
- HSn70-1A
How much does C44300 cost?
C44300 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.
C44300 — frequently asked
What is C44300 used for?
C44300 is typically used for condenser and heat exchanger tubes, feedwater heater tubes and marine tubing. In short: classic condenser tube brass; arsenic-inhibited dezincification resistance; highest formability tin-brass.
What is the yield strength of C44300?
C44300 has a typical yield strength of 125 MPa (18.1 ksi) and a tensile strength of 340 MPa (49.3 ksi) — weaker than 77% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is C44300 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Machinability ~30% of free-cutting brass — gummy, low-lead chips; use sharp positive-rake tools, high speed, generous coolant.
Can C44300 be welded?
With care — weldability is rated fair (45/100). Fair weldability: prefer brazing or soldering; if welded use GTAW with Cu-Si/Cu-Sn filler, low heat input, and extract zinc fume.
What surface finishes work on C44300?
Solders and brazes readily; not anodizable — protect with benzotriazole inhibitor, tin/nickel plating, or clear lacquer; polishes to bright yellow finish.
Can C44300 be formed, bent or molded?
Excellent cold formability in O61/OS tempers (expanding, U-bending, drawing); stress relieve drawn tube at 250–300 °C to avoid ammonia SCC.
What is the maximum service temperature of C44300?
C44300 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 C44300-O61 and C44300-H80?
O61 is the default condition — standard condenser/heat-exchanger tube condition — maximum ductility for expanding into tubesheets and U-bending. H80: maximum strength drawn tube for pressure-carrying or structural service; not for tube expanding or tight bends. Yield strength is 125 MPa in O61 versus 350 MPa in H80.
How much does C44300 cost?
C44300 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 (2021)
- ASTM B171 — Copper-Alloy Plate and Sheet for Pressure Vessels, Condensers and Heat Exchangers — ASTM (2018)
- CDA Alloy Datasheet C44300 (Admiralty Brass, Arsenical) — Copper Development Association (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- EN 12451 / CW706R — Seamless round tubes for heat exchangers — CEN (2012)
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.