Copper Alloy C83800-M05
Finish state
UNS C83800
M05 = as plaster cast
Choose for medium-volume small fittings needing tighter dimensions, finer grain and modestly higher strength than sand casting.
Values for the M05 condition
Other C83800 tempers and conditions
C83800 is listed in 5 conditions; see the grade overview at C83800.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
M01Default As sand cast | Standard stocked condition for valve bodies, fittings and general pressure-tight sand castings per ASTM B584. | 110 | 241 | 25 | 55 HB | 15 % IACS |
As investment cast | For small, intricate near-net-shape pressure parts where sand-cast draft and machining allowance are unacceptable. | 110 | 241 | 22 | 55 HB | 15 % IACS |
As centrifugally cast | Pick for rings, sleeves and bushings where centrifugal casting gives a denser, slightly stronger and cleaner wall (ASTM B271). | 117 | 255 | 22 | 60 HB | 15 % IACS |
M05This page As plaster cast | Choose for medium-volume small fittings needing tighter dimensions, finer grain and modestly higher strength than sand casting. | 124 | 262 | 18 | 62 HB | 15 % IACS |
As continuous cast | Standard for solid bar and hollow tube stock cut into machined hydraulic fittings; densest, most leak-tight and highest-yield form (ASTM B505). | 138 | 262 | 16 | 65 HB | 15 % IACS |
What is C83800-M05?
C83800-M05 is C83800 supplied in the M05 condition — choose for medium-volume small fittings needing tighter dimensions, finer grain and modestly higher strength than sand casting. C83800-M05 has a yield strength of 124 MPa (18 ksi) and a tensile strength of 262 MPa (38 ksi) — weaker than 78% of copper alloy grades. Elongation at break is 18% and the elastic modulus is 90 GPa (13.1 Msi). C83800-M05 has a density of 8.6 g/cm³ (0.311 lb/in³), lighter than 59% of copper alloy grades. It melts at 843°C (1,549 °F). M01 is the default condition FabDigit quotes; M05 is available on request or by drawing note.
Advantages
- Easy to machine — 88/100, better than 96% of copper alloy grades
Limitations
- Low stiffness — 90 GPa (13.1 Msi), worse than 95% of copper alloy grades
- Hard to polish — 60/100, worse than 92% of copper alloy grades
- Difficult to weld — 20/100, worse than 88% of copper alloy grades
- Low strength — 124 MPa (18 ksi), worse than 78% of copper alloy grades
C83800-M05 properties
Typical room-temperature values for C83800-M05; 21 are specific to this condition. Other listed values are C83800 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C83800-M05 has a density of 8.6 g/cm³ (0.311 lb/in³), lighter than 59% of copper alloy grades. It melts at 843°C (1,549 °F).
Mechanical11
C83800-M05 has a yield strength of 124 MPa (18 ksi) and a tensile strength of 262 MPa (38 ksi) — weaker than 78% of copper alloy grades. Elongation at break is 18% and the elastic modulus is 90 GPa (13.1 Msi).
Thermal6
C83800-M05 is rated for continuous service to 200°C (392 °F). It conducts heat at 72 W/m·K (41.6 BTU/hr·ft·°F), worse than 52% of copper alloy grades. Thermal expansion is 18 µm/m·K (10 µin/in·°F).
Electrical3
C83800-M05 conducts electricity at 15 % IACS, worse than 54% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (59/100), worse than 73% of copper alloy grades.
Sustainability4
Producing a kilogram of C83800-M05 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 85%.
Manufacturability7
C83800-M05's machinability is excellent (88/100, better than 96% of copper alloy grades); weldability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C83800-M05
Is C83800 easy to machine?
Excellent free-machining behaviour (≈90 % of C36000) — use sharp positive-rake carbide or HSS tools, light feeds and flood coolant; lead gives short chips and good bore finish, so it is ideal for high-volume screw-machine fittings.
Can C83800 be welded?
Not recommended for fusion welding (lead causes hot cracking and porosity); join by soft soldering (excellent) or silver brazing with careful flux and low heat input.
Can C83800 be formed, bent or molded?
Cast alloy only — no cold forming; excellent castability and pressure tightness in sand, permanent-mold, centrifugal and continuous casting, with gating designed to feed the wide freezing range (843–1004 °C).
What surface finishes work on C83800?
Takes electroless/electrolytic Ni, Cr and decorative brass plating well and solders readily; polish to a medium lustre (lead smears at high buffing pressure), and use benzotriazole or lacquer to prevent tarnish.
C83800 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 |
|---|---|---|
| CuCu + named elements ≥ 99.3 % | 82 – 83.8 | 83 |
| Sn | 3.3 – 4.2 | 3.8 |
| Pbfree-machining / pressure-tightness phase | 5 – 7 | 6 |
| Zn | 5 – 8 | 6.5 |
| Niincl. Co | ≤ 1 | — |
| Fe | ≤ 0.3 | — |
| Sb | ≤ 0.25 | — |
| S | ≤ 0.08 | — |
| P | ≤ 0.03 | — |
| Al | ≤ 0.01 | — |
| Si | ≤ 0.01 | — |
C83800-M05 — frequently asked
What is C83800-M05 used for?
C83800-M05 is typically used for hydraulic fittings, valves, pump bodies and water meter housings. In short: best-machining cast brass; pressure-tight castings; low-cost plumbing alloy.
What is the yield strength of C83800-M05?
C83800-M05 has a typical yield strength of 124 MPa (18 ksi) and a tensile strength of 262 MPa (38 ksi) — weaker than 78% of copper alloy grades. Strength varies by condition: see the 5 listed tempers.
Is C83800-M05 easy to machine?
Yes — machinability is rated excellent (88/100, better than 96% of copper alloy grades). Excellent free-machining behaviour (≈90 % of C36000) — use sharp positive-rake carbide or HSS tools, light feeds and flood coolant; lead gives short chips and good bore finish, so it is ideal for high-volume screw-machine fittings.
Can C83800-M05 be welded?
Not readily — weldability is rated poor (20/100). Not recommended for fusion welding (lead causes hot cracking and porosity); join by soft soldering (excellent) or silver brazing with careful flux and low heat input.
What surface finishes work on C83800-M05?
Takes electroless/electrolytic Ni, Cr and decorative brass plating well and solders readily; polish to a medium lustre (lead smears at high buffing pressure), and use benzotriazole or lacquer to prevent tarnish.
Can C83800-M05 be formed, bent or molded?
Cast alloy only — no cold forming; excellent castability and pressure tightness in sand, permanent-mold, centrifugal and continuous casting, with gating designed to feed the wide freezing range (843–1004 °C).
What is the maximum service temperature of C83800-M05?
C83800-M05 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 C83800-M01 and C83800-M07?
M01 is the default condition — standard stocked condition for valve bodies, fittings and general pressure-tight sand castings per ASTM B584. M07: standard for solid bar and hollow tube stock cut into machined hydraulic fittings; densest, most leak-tight and highest-yield form (ASTM B505). Yield strength is 110 MPa in M01 versus 138 MPa in M07.
Sources
- ASTM B584 — Copper Alloy Sand Castings for General Applications — ASTM International (2022)
- ASTM B505/B505M — Copper Alloy Continuous Castings — ASTM International (2018)
- ASTM B271 — Copper-Base Alloy Centrifugal Castings — ASTM International (2020)
- ASTM B601 — Temper Designations for Copper and Copper Alloys — ASTM International (2019)
- Copper Alloy C83800 alloy datasheet — Copper Development Association (copper.org) (2024)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — 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.