Copper Alloy C61900-M10
Heat-treated state
UNS C61900 · ASTM B150
M10 = as hot forged and air cooled
Pick for forged rings, valve bodies and shafts where toughness/ductility matter more than peak yield strength.
Values for the M10 condition
Other C61900 tempers and conditions
C61900 is listed in 4 conditions; see the grade overview at C61900.
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 |
M10This page 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-M10?
C61900-M10 is C61900 heat treated to M10 — pick for forged rings, valve bodies and shafts where toughness/ductility matter more than peak yield strength. C61900-M10 has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 60% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 117 GPa (17 Msi). C61900-M10 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). M20 is the default condition FabDigit quotes; M10 is available on request or by drawing note.
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
- Ductile — tolerates forming and impact — 30%, better than 75% of copper alloy grades
Limitations
- Low electrical conductivity — 8 % IACS, worse than 81% of copper alloy grades
C61900-M10 properties
Typical room-temperature values for C61900-M10; 14 are specific to this condition. Other listed values are C61900 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C61900-M10 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-M10 has a yield strength of 290 MPa (42.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 60% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C61900-M10 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-M10 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-M10 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-M10's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability very good (75/100); formability fair (40/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C61900-M10
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.
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.
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 | — |
C61900-M10 — frequently asked
What is C61900-M10 used for?
C61900-M10 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-M10?
C61900-M10 has a typical yield strength of 290 MPa (42.1 ksi) and a tensile strength of 620 MPa (89.9 ksi) — stronger than 60% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C61900-M10 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-M10 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-M10?
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-M10 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-M10?
C61900-M10 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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.