Copper Alloy C97800-M07
Heat-treated state
UNS C97800
M07 = as continuous cast
Best choice for bar and tube stock machined into bushings and gear blanks; densest, most uniform structure (ASTM B505).
Values for the M07 condition
Other C97800 tempers and conditions
C97800 is listed in 5 conditions; see the grade overview at C97800.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
M01Default As sand cast | Standard stocked/produced condition for general castings to ASTM B584 — gears, valve parts, ornamental hardware. | 225 | 400 | 15 | 130 HB | 4.5 % IACS |
As investment cast | Choose for intricate ornamental or near-net-shape parts where machining allowance must be minimal. | 225 | 400 | 13 | 130 HB | 4.5 % IACS |
As plaster cast | For medium-volume runs of small hardware needing better surface finish and dimensional repeatability than sand casting. | 235 | 415 | 14 | 133 HB | 4.5 % IACS |
As centrifugally cast | Pick for rings, bushings and worm-gear blanks needing sounder, finer-grained metal than sand casting. | 240 | 425 | 15 | 135 HB | 4.5 % IACS |
M07This page As continuous cast | Best choice for bar and tube stock machined into bushings and gear blanks; densest, most uniform structure (ASTM B505). | 250 | 435 | 15 | 140 HB | 4.5 % IACS |
What is C97800-M07?
C97800-M07 is C97800 heat treated to M07 — best choice for bar and tube stock machined into bushings and gear blanks; densest, most uniform structure (ASTM B505). C97800-M07 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 435 MPa (63.1 ksi) — stronger than 54% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 125 GPa (18.1 Msi). C97800-M07 has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 1,065°C (1,949 °F). M01 is the default condition FabDigit quotes; M07 is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 85/100, better than 92% of copper alloy grades
- Good corrosion resistance — 73/100, better than 87% of copper alloy grades
- High service temperature — 260°C (500 °F), better than 75% of copper alloy grades
Limitations
- Poor heat conductor — 25 W/m·K (14.4 BTU/hr·ft·°F), worse than 98% of copper alloy grades
- Low electrical conductivity — 4.5 % IACS, worse than 98% of copper alloy grades
- High embodied carbon — 5.6 kg CO₂/kg, worse than 91% of copper alloy grades
- Limited formability — 15/100, worse than 79% of copper alloy grades
- Difficult to weld — 25/100, worse than 78% of copper alloy grades
C97800-M07 properties
Typical room-temperature values for C97800-M07; 20 are specific to this condition. Other listed values are C97800 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C97800-M07 has a density of 8.8 g/cm³ (0.318 lb/in³), heavier than 58% of copper alloy grades. It melts at 1,065°C (1,949 °F).
Mechanical14
C97800-M07 has a yield strength of 250 MPa (36.3 ksi) and a tensile strength of 435 MPa (63.1 ksi) — stronger than 54% of copper alloy grades. Elongation at break is 15% and the elastic modulus is 125 GPa (18.1 Msi).
Thermal6
C97800-M07 is rated for continuous service to 260°C (500 °F). It conducts heat at 25 W/m·K (14.4 BTU/hr·ft·°F), worse than 98% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C97800-M07 conducts electricity at 4.5 % IACS, worse than 98% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (73/100), better than 87% of copper alloy grades.
Sustainability4
Producing a kilogram of C97800-M07 takes about 78 MJ of energy and emits 5.6 kg of CO₂ — more than 90% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C97800-M07's machinability is good (58/100, better than 73% of copper alloy grades); weldability poor (25/100); formability poor (15/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C97800-M07
Is C97800 easy to machine?
Machines to a clean silvery finish at ~60% of free-cutting brass; the high-nickel matrix work-hardens, so use sharp carbide, positive rake, moderate speed with steady feed and soluble-oil coolant.
Can C97800 be welded?
Fusion welding is not recommended because of the lead content and hot-short Cu-Ni-Sn structure; join by silver brazing or soft soldering, and preheat/stress-relieve repairs.
Can C97800 be formed, bent or molded?
Foundry alloy only — pour hot (~1200–1250 °C) with good risering and directional solidification to avoid tin/lead interdendritic shrinkage; not intended for cold forming.
What surface finishes work on C97800?
Takes a high natural silver-white polish and accepts nickel or chromium plating readily; anodizing is not applicable, and lacquer or clear coat prevents slow tarnish outdoors.
C97800 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 |
|---|---|---|
| Niincludes Co | 24 – 27 | 25.5 |
| Sn | 4 – 5.5 | 4.7 |
| Pbmachinability/pressure tightness | 1 – 2.5 | 1.8 |
| Zn | 1 – 4 | 2.5 |
| Fe | ≤ 1.5 | — |
| Mn | ≤ 1.5 | — |
| Sb | ≤ 0.15 | — |
| Si | ≤ 0.15 | — |
| S | ≤ 0.08 | — |
| P | ≤ 0.05 | — |
| Al | ≤ 0.01 | — |
| Cu | ≥ 64 (balance) | — |
C97800-M07 — frequently asked
What is C97800-M07 used for?
C97800-M07 is typically used for gears, bearings and bushings, marine hardware and ornamental fittings. In short: strongest leaded nickel silver; gear and bearing casting grade; bright silver-white polish.
What is the yield strength of C97800-M07?
C97800-M07 has a typical yield strength of 250 MPa (36.3 ksi) and a tensile strength of 435 MPa (63.1 ksi) — stronger than 54% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C97800-M07 easy to machine?
Reasonably — machinability is rated good (58/100, better than 73% of copper alloy grades). Machines to a clean silvery finish at ~60% of free-cutting brass; the high-nickel matrix work-hardens, so use sharp carbide, positive rake, moderate speed with steady feed and soluble-oil coolant.
Can C97800-M07 be welded?
Not readily — weldability is rated poor (25/100). Fusion welding is not recommended because of the lead content and hot-short Cu-Ni-Sn structure; join by silver brazing or soft soldering, and preheat/stress-relieve repairs.
What surface finishes work on C97800-M07?
Takes a high natural silver-white polish and accepts nickel or chromium plating readily; anodizing is not applicable, and lacquer or clear coat prevents slow tarnish outdoors.
Can C97800-M07 be formed, bent or molded?
Foundry alloy only — pour hot (~1200–1250 °C) with good risering and directional solidification to avoid tin/lead interdendritic shrinkage; not intended for cold forming.
What is the maximum service temperature of C97800-M07?
C97800-M07 is rated for continuous use to about 260°C (500 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C97800-M01 and C97800-M07?
M01 is the default condition — standard stocked/produced condition for general castings to ASTM B584 — gears, valve parts, ornamental hardware. M07: best choice for bar and tube stock machined into bushings and gear blanks; densest, most uniform structure (ASTM B505). Yield strength is 225 MPa in M01 versus 250 MPa in M07.
Sources
- ASTM B584 — Standard Specification for Copper Alloy Sand Castings for General Applications — ASTM International (2022)
- ASTM B505/B505M — Copper Alloy Continuous Castings — ASTM International (2018)
- CDA Alloy Datasheet C97800 (25% leaded nickel silver) — Copper Development Association (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials — ASM International (2005)
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.