Copper Alloy C61900
UNS C61900 · ASTM B150
C61900 is an aluminum bronze with a tin addition (ASTM B150) that improves the castability of weld deposits and corrosion resistance; it is most often stocked as welding and brazing rod.
Reference datasheet — C61900 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 M20 condition
C61900 tempers and conditions
C61900 is supplied in 4 conditions, soft to hard. M20 is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As-welded deposit | Use these values when the alloy is applied as a GTAW/GMAW filler or hardfacing/build-up deposit rather than as bar stock. | 250 | 585 | 20 | 150 HB | 7.5 % IACS |
As hot forged and air cooled | Pick for forged rings, valve bodies and shafts where toughness/ductility matter more than peak yield strength. | 290 | 620 | 30 | 160 HB | 8 % IACS |
M20Default As hot rolled | Default stock condition for rod, bar and welding-rod cut lengths; balanced strength and ductility. | 310 | 630 | 25 | 170 HB | 8 % IACS |
Drawn and stress relieved | Pick when higher yield strength, straightness and closer size tolerance are needed for machined shafting, bolts and bushings. | 480 | 700 | 15 | 195 HB | 8 % IACS |
What is C61900?
C61900 is an aluminum bronze with a tin addition (ASTM B150) that improves the castability of weld deposits and corrosion resistance; it is most often stocked as welding and brazing rod. Wrought material runs 310 MPa yield, 630 MPa tensile, 25% elongation, 170 HB (86 HRB), 8% IACS and service to 300 °C, with weldability rated 75 and corrosion resistance 72. Cold formability is low at 35 and machining is slow, so shapes are hot worked and the grade is selected for joining and corrosion duty rather than volume machining. C61800 is the usual structural substitute. C61900 has a density of 7.58 g/cm³ (0.274 lb/in³), lighter than 94% of copper alloy grades. It melts at 1,030°C (1,886 °F). C61900 has a yield strength of 310 MPa (45 ksi) and a tensile strength of 630 MPa (91.4 ksi) — stronger than 64% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 117 GPa (17 Msi).
What is C61900 used for?
- welding filler rod
- corrosion-resistant fittings
- marine hardware
Advantages
- Lightweight — 7.58 g/cm³ (0.274 lb/in³), better than 94% of copper alloy grades
- Readily welded — 75/100, better than 89% of copper alloy grades
- High service temperature — 300°C (572 °F), better than 85% of copper alloy grades
- Good corrosion resistance — 72/100, better than 84% of copper alloy grades
Limitations
- Low electrical conductivity — 8 % IACS, worse than 81% of copper alloy grades
C61900 properties
Typical room-temperature values for C61900-M20; bars are the position among copper alloy grades.
Physical3
C61900 has a density of 7.58 g/cm³ (0.274 lb/in³), lighter than 94% of copper alloy grades. It melts at 1,030°C (1,886 °F).
Mechanical15
C61900 has a yield strength of 310 MPa (45 ksi) and a tensile strength of 630 MPa (91.4 ksi) — stronger than 64% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C61900 is rated for continuous service to 300°C (572 °F). It conducts heat at 56 W/m·K (32.4 BTU/hr·ft·°F), worse than 64% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C61900 conducts electricity at 8 % IACS, worse than 81% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), better than 84% of copper alloy grades.
Sustainability4
Producing a kilogram of C61900 takes about 58 MJ of energy and emits 3.9 kg of CO₂ — more than 61% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
C61900's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability very good (75/100); formability fair (35/100).
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. C61900 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C61900
Is C61900 easy to machine?
Machines like a tough gummy bronze — rigid setups, sharp positive-rake carbide, 60–120 m/min, heavy feeds and flood coolant; expect ~30 % of AISI 1212 rates and short chips only with chip-breaking geometry.
Can C61900 be welded?
Readily joined by GTAW/GMAW with matching Al-bronze filler (this alloy is itself a filler); use DCEN/spray transfer, argon shielding, low interpass temperature and thorough removal of the alumina film — avoid oxyacetylene and heavy dilution with steel.
Can C61900 be formed, bent or molded?
Hot work at 700–850 °C (forge/extrude/hot roll); cold formability is limited, so keep cold reductions small and stress-relieve at 350–450 °C after drawing or bending.
C61900 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 |
|---|---|---|
| Al | 8.5 – 10 | 9.5 |
| Fe | 3 – 4.5 | 3.7 |
| Sntin addition aids fluidity/soundness of deposits | ≤ 0.6 | 0.35 |
| Zn | ≤ 0.8 | |
| Mn | ≤ 0.5 | |
| Nisometimes reported with Co | ≤ 0.5 | |
| Si | ≤ 0.1 | |
| Curemainder, ~86–88 % typical | balance |
What surface finishes work on C61900?
Polishes to a golden bronze; no anodizing — use pickling in dilute sulphuric/nitric to remove alumina and oxide, then patination, clear lacquer or nickel plating (strike required) for appearance parts.
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 C61900 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B150
- Other
- ERCuAl-A3
How much does C61900 cost?
C61900 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.
C61900 — frequently asked
What is C61900 used for?
C61900 is typically used for welding filler rod, corrosion-resistant fittings and marine hardware. In short: filler-rod aluminum bronze; best weldability in family; limited cold formability.
What is the yield strength of C61900?
C61900 has a typical yield strength of 310 MPa (45 ksi) and a tensile strength of 630 MPa (91.4 ksi) — stronger than 64% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C61900 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Machines like a tough gummy bronze — rigid setups, sharp positive-rake carbide, 60–120 m/min, heavy feeds and flood coolant; expect ~30 % of AISI 1212 rates and short chips only with chip-breaking geometry.
Can C61900 be welded?
Yes — weldability is rated very good (75/100). Readily joined by GTAW/GMAW with matching Al-bronze filler (this alloy is itself a filler); use DCEN/spray transfer, argon shielding, low interpass temperature and thorough removal of the alumina film — avoid oxyacetylene and heavy dilution with steel.
What surface finishes work on C61900?
Polishes to a golden bronze; no anodizing — use pickling in dilute sulphuric/nitric to remove alumina and oxide, then patination, clear lacquer or nickel plating (strike required) for appearance parts.
Can C61900 be formed, bent or molded?
Hot work at 700–850 °C (forge/extrude/hot roll); cold formability is limited, so keep cold reductions small and stress-relieve at 350–450 °C after drawing or bending.
What is the maximum service temperature of C61900?
C61900 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C61900-M20 and C61900-HR50?
M20 is the default condition — default stock condition for rod, bar and welding-rod cut lengths; balanced strength and ductility. HR50: pick when higher yield strength, straightness and closer size tolerance are needed for machined shafting, bolts and bushings. Yield strength is 310 MPa in M20 versus 480 MPa in HR50.
How much does C61900 cost?
C61900 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 B150/B150M — Aluminum Bronze Rod, Bar and Shapes — ASTM International (2019)
- CDA/copper.org Alloy Database — C61900 — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
- AWS A5.7/A5.7M — Copper and Copper-Alloy Bare Welding Rods and Electrodes — American Welding Society (2007)
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.