Copper Alloy C76200-M20
Finish state
UNS C76200 · EN CW405J
M20 = as hot rolled
Hot-rolled plate/bar stock for further machining or forming where no defined cold work is required.
Values for the M20 condition
Other C76200 tempers and conditions
C76200 is listed in 7 conditions; see the grade overview at C76200.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
M20This page As hot rolled | Hot-rolled plate/bar stock for further machining or forming where no defined cold work is required. | 140 | 370 | 45 | 85 HB | 6 % IACS |
Annealed to 0.035 mm grain size | Choose for deep drawing, severe bending or spinning where maximum ductility is needed. | 152 | 386 | 40 | 95 HB | 6 % IACS |
Quarter hard | Light cold work for parts that still need moderate bending but more stiffness than annealed. | 310 | 450 | 25 | 130 HB | 5.7 % IACS |
H02Default Half hard | The general-purpose stocked strip temper: good balance of strength and 90° bendability for trim and stampings. | 448 | 517 | 10 | 155 HB | 5.5 % IACS |
Full hard | For flat blanked parts, clips and stiff trim where only gentle forming along the grain is done. | 517 | 586 | 3 | 175 HB | 5.5 % IACS |
Extra hard | High-strength strip for flat springs and contacts formed only with generous bend radii. | 586 | 655 | 2 | 190 HB | 5.5 % IACS |
Spring hard | Maximum strength/elastic limit temper for flat springs, contact fingers and snap parts. | 620 | 700 | 2 | 200 HB | 5.5 % IACS |
What is C76200-M20?
C76200-M20 is C76200 supplied in the M20 condition — hot-rolled plate/bar stock for further machining or forming where no defined cold work is required. C76200-M20 has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 370 MPa (53.7 ksi) — weaker than 74% of copper alloy grades. Elongation at break is 45% and the elastic modulus is 124 GPa (18 Msi). C76200-M20 has a density of 8.7 g/cm³ (0.314 lb/in³), lighter than 56% of copper alloy grades. It melts at 1,010°C (1,850 °F). H02 is the default condition FabDigit quotes; M20 is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 90/100, better than 99% of copper alloy grades
- Ductile — tolerates forming and impact — 45%, better than 91% of copper alloy grades
- Forms and bends easily — 80/100, better than 83% of copper alloy grades
Limitations
- Poor heat conductor — 29 W/m·K (16.8 BTU/hr·ft·°F), worse than 93% of copper alloy grades
- Low electrical conductivity — 6 % IACS, worse than 93% of copper alloy grades
- High embodied carbon — 5 kg CO₂/kg, worse than 86% of copper alloy grades
C76200-M20 properties
Typical room-temperature values for C76200-M20; 11 are specific to this condition. Other listed values are C76200 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C76200-M20 has a density of 8.7 g/cm³ (0.314 lb/in³), lighter than 56% of copper alloy grades. It melts at 1,010°C (1,850 °F).
Mechanical12
C76200-M20 has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 370 MPa (53.7 ksi) — weaker than 74% of copper alloy grades. Elongation at break is 45% and the elastic modulus is 124 GPa (18 Msi).
Thermal6
C76200-M20 is rated for continuous service to 250°C (482 °F). It conducts heat at 29 W/m·K (16.8 BTU/hr·ft·°F), worse than 93% of copper alloy grades. Thermal expansion is 16.2 µm/m·K (9 µin/in·°F).
Electrical3
C76200-M20 conducts electricity at 6 % IACS, worse than 93% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of C76200-M20 takes about 72 MJ of energy and emits 5 kg of CO₂ — more than 86% of copper alloy grades. Typical recycled content is 40%.
Manufacturability6
C76200-M20's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability fair (50/100); formability very good (80/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C76200-M20
Is C76200 easy to machine?
Gummy, low-lead alloy — rating ≈20 % of free-cutting brass; use sharp positive-rake tools, high speed, generous coolant, or specify leaded C79200 when heavy turning is required.
Can C76200 be welded?
Resistance and brazing/soldering are the preferred joining routes; fusion welding risks zinc fume and porosity, so use silver brazing filler or spot welding.
Can C76200 be formed, bent or molded?
Excellent cold formability in OS035/H01 tempers (deep draw, roll form); anneal 600–750 °C between heavy passes and stress-relieve formed hard tempers to avoid ammonia SCC.
What surface finishes work on C76200?
Takes a high bright polish naturally silver-white; readily nickel-, chrome- or silver-plated, and can be chemically blackened or lacquered for decorative trim.
C76200 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 ≥ 99.5 % | 57 – 61 | 59 |
| NiNi + Co | 11 – 13.5 | 12 |
| Pb | ≤ 0.1 | — |
| Fe | ≤ 0.25 | — |
| Mn | ≤ 0.5 | — |
| Zn | balance | — |
C76200-M20 — frequently asked
What is C76200-M20 used for?
C76200-M20 is typically used for hardware trim, costume jewelry, optical components and general stampings. In short: lowest-cost bright nickel silver; best formability in family; high-zinc, low-nickel grade.
What is the yield strength of C76200-M20?
C76200-M20 has a typical yield strength of 140 MPa (20.3 ksi) and a tensile strength of 370 MPa (53.7 ksi) — weaker than 74% of copper alloy grades. Strength varies by condition: see the 7 listed tempers.
Is C76200-M20 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% of copper alloy grades). Gummy, low-lead alloy — rating ≈20 % of free-cutting brass; use sharp positive-rake tools, high speed, generous coolant, or specify leaded C79200 when heavy turning is required.
Can C76200-M20 be welded?
With care — weldability is rated fair (50/100). Resistance and brazing/soldering are the preferred joining routes; fusion welding risks zinc fume and porosity, so use silver brazing filler or spot welding.
What surface finishes work on C76200-M20?
Takes a high bright polish naturally silver-white; readily nickel-, chrome- or silver-plated, and can be chemically blackened or lacquered for decorative trim.
Can C76200-M20 be formed, bent or molded?
Excellent cold formability in OS035/H01 tempers (deep draw, roll form); anneal 600–750 °C between heavy passes and stress-relieve formed hard tempers to avoid ammonia SCC.
What is the maximum service temperature of C76200-M20?
C76200-M20 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 C76200-H02 and C76200-M20?
H02 is the default condition — the general-purpose stocked strip temper: good balance of strength and 90° bendability for trim and stampings. M20: hot-rolled plate/bar stock for further machining or forming where no defined cold work is required. Yield strength is 448 MPa in H02 versus 140 MPa in M20.
Sources
- ASTM B122/B122M — Copper-Nickel-Zinc (Nickel Silver) Plate, Sheet, Strip and Rolled Bar — ASTM International (2022)
- ASTM B151/B151M — Copper-Nickel-Zinc and Copper-Nickel Rod and Bar — ASTM International (2021)
- CDA Alloy Database — C76200 property sheet — Copper Development Association (2023)
- ASM Handbook Vol. 2: Properties and Selection — Nonferrous Alloys — ASM International (1990)
- EN 12163 / CW405J copper-nickel-zinc designations — CEN (2016)
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.