Copper Alloy C99400-M05
Finish state
UNS C99400 · ASTM B584
M05 = as plaster cast
Choose for thinner, faster-solidified sections: finer grain gives ~5–10 % higher strength and hardness than sand cast.
Values for the M05 condition
Other C99400 tempers and conditions
C99400 is listed in 4 conditions; see the grade overview at C99400.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
FDefault As fabricated | Default stocked/produced condition: good ductility and toughness for general marine and industrial castings. | 205 | 415 | 20 | 125 HB | 8 % IACS |
As sand cast | Standard as-sand-cast condition of C99400 nickel-manganese-aluminium bronze-brass, combining ~415 MPa strength with good ductility, seawater corrosion resistance and easy machining. | 221 | 448 | 22 | 140 HB | 8 % IACS |
M05This page As plaster cast | Choose for thinner, faster-solidified sections: finer grain gives ~5–10 % higher strength and hardness than sand cast. | 230 | 450 | 18 | 135 HB | 8 % IACS |
Solution treated and precipitation (age) hardened | Choose when maximum strength, wear resistance and hardness are needed (gears, bushings, high-load valve parts) and lower ductility is acceptable. | 380 | 545 | 12 | 180 HB | 10 % IACS |
What is C99400-M05?
C99400-M05 is C99400 supplied in the M05 condition — choose for thinner, faster-solidified sections: finer grain gives ~5–10 % higher strength and hardness than sand cast. C99400-M05 has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 450 MPa (65.3 ksi) — stronger than 51% of copper alloy grades. Elongation at break is 18% and the elastic modulus is 117 GPa (17 Msi). C99400-M05 has a density of 8 g/cm³ (0.289 lb/in³), lighter than 87% of copper alloy grades. It melts at 996°C (1,825 °F). F is the default condition FabDigit quotes; M05 is available on request or by drawing note.
Advantages
- Good corrosion resistance — 74/100, better than 88% of copper alloy grades
Limitations
- Limited formability — 8/100, worse than 94% of copper alloy grades
- Low electrical conductivity — 8 % IACS, worse than 81% of copper alloy grades
- Poor heat conductor — 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 80% of copper alloy grades
C99400-M05 properties
Typical room-temperature values for C99400-M05; 21 are specific to this condition. Other listed values are C99400 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C99400-M05 has a density of 8 g/cm³ (0.289 lb/in³), lighter than 87% of copper alloy grades. It melts at 996°C (1,825 °F).
Mechanical13
C99400-M05 has a yield strength of 230 MPa (33.4 ksi) and a tensile strength of 450 MPa (65.3 ksi) — stronger than 51% of copper alloy grades. Elongation at break is 18% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C99400-M05 is rated for continuous service to 250°C (482 °F). It conducts heat at 42 W/m·K (24.3 BTU/hr·ft·°F), worse than 80% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C99400-M05 conducts electricity at 8 % IACS, worse than 81% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (74/100), better than 88% of copper alloy grades.
Sustainability4
Producing a kilogram of C99400-M05 takes about 48 MJ of energy and emits 3.4 kg of CO₂ — less than 92% of copper alloy grades. Typical recycled content is 70%.
Manufacturability7
C99400-M05's machinability is good (60/100, better than 74% of copper alloy grades); weldability fair (40/100); formability not recommended (8/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C99400-M05
Is C99400 easy to machine?
Machines like a medium-hard bronze (~80 % of free-cutting brass): use sharp carbide tools, positive rake, moderate speeds and flood coolant; hard silicide particles increase tool wear, and the aged HT condition cuts noticeably slower.
Can C99400 be welded?
GTAW/GMAW possible with matched or silicon-bronze filler and 150–250 °C preheat, but the aluminium content forms a tenacious oxide and the alloy is hot-short — clean thoroughly, avoid heavy restraint, and re-age after welding of HT parts.
Can C99400 be formed, bent or molded?
Foundry alloy only — good fluidity for sand, permanent-mold and centrifugal casting; feed heavy sections with risers and use degassing to avoid gas porosity; no cold forming.
What surface finishes work on C99400?
Takes a bright white polish and buffs well; not anodisable — protect with tin, nickel or chrome plating, chemical passivation or clear lacquer; abrasive blasting removes casting skin before plating.
C99400 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 |
|---|---|---|
| NiNi + Co | 1 – 3.5 | 2.2 |
| Fe | 1 – 3 | 1.8 |
| Al | 0.5 – 2 | 1.2 |
| Siwith Ni forms age-hardening silicides | 0.5 – 2 | 1.2 |
| Zn | 0.5 – 2 | 1.2 |
| Mn | ≤ 0.5 | 0.3 |
| Pbimpurity limit | ≤ 0.25 | — |
| Cu | balance | — |
C99400-M05 — frequently asked
What is C99400-M05 used for?
C99400-M05 is typically used for marine hardware, pump components, valve bodies and industrial fittings. In short: most corrosion-resistant cast brass; heat-treatable to higher hardness; slowest machining of the family.
What is the yield strength of C99400-M05?
C99400-M05 has a typical yield strength of 230 MPa (33.4 ksi) and a tensile strength of 450 MPa (65.3 ksi) — stronger than 51% of copper alloy grades. Strength varies by condition: see the 4 listed tempers.
Is C99400-M05 easy to machine?
Reasonably — machinability is rated good (60/100, better than 74% of copper alloy grades). Machines like a medium-hard bronze (~80 % of free-cutting brass): use sharp carbide tools, positive rake, moderate speeds and flood coolant; hard silicide particles increase tool wear, and the aged HT condition cuts noticeably slower.
Can C99400-M05 be welded?
With care — weldability is rated fair (40/100). GTAW/GMAW possible with matched or silicon-bronze filler and 150–250 °C preheat, but the aluminium content forms a tenacious oxide and the alloy is hot-short — clean thoroughly, avoid heavy restraint, and re-age after welding of HT parts.
What surface finishes work on C99400-M05?
Takes a bright white polish and buffs well; not anodisable — protect with tin, nickel or chrome plating, chemical passivation or clear lacquer; abrasive blasting removes casting skin before plating.
Can C99400-M05 be formed, bent or molded?
Foundry alloy only — good fluidity for sand, permanent-mold and centrifugal casting; feed heavy sections with risers and use degassing to avoid gas porosity; no cold forming.
What is the maximum service temperature of C99400-M05?
C99400-M05 is rated for continuous use to about 250°C (482 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C99400-F and C99400-HT?
F is the default condition — default stocked/produced condition: good ductility and toughness for general marine and industrial castings. HT: choose when maximum strength, wear resistance and hardness are needed (gears, bushings, high-load valve parts) and lower ductility is acceptable. Yield strength is 205 MPa in F versus 380 MPa in HT.
Sources
- ASTM B584 — Standard Specification for Copper Alloy Sand Castings for General Applications — ASTM International (2022)
- CDA Alloy Database — C99400 composition and properties — Copper Development Association (copper.org) (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Specialty Handbook: Copper and Copper Alloys — ASM International (2001)
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.