Copper Alloy C35000-M20
Finish state
UNS C35000
M20 = as hot rolled
Rod, shapes and forging stock supplied as hot-worked; choose for forged hardware to be finish-machined.
Values for the M20 condition
Other C35000 tempers and conditions
C35000 is listed in 8 conditions; see the grade overview at C35000.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick for maximum ductility: deep bending, forming, riveting and staking before final machining. | 117 | 317 | 50 | 62 HB | 27 % IACS |
M20This page As hot rolled | Rod, shapes and forging stock supplied as hot-worked; choose for forged hardware to be finish-machined. | 140 | 340 | 40 | 80 HB | 27 % IACS |
Quarter hard | Light temper when moderate strength must be combined with 90° bending across the grain. | 275 | 372 | 30 | 95 HB | 26 % IACS |
H02Default Half hard | The stock general-purpose temper: best balance of strength, chip control and residual forming ability. | 345 | 420 | 18 | 115 HB | 26 % IACS |
Full hard | Use where flat blanked parts need stiffness and clean shearing rather than bending. | 395 | 483 | 7 | 140 HB | 26 % IACS |
Extra hard | Higher-strength strip for flat contacts and stampings with only gentle radii. | 427 | 524 | 5 | 150 HB | 26 % IACS |
Spring hard | Spring strip for clips and flat springs where elastic limit matters more than bendability. | 448 | 552 | 4 | 160 HB | 26 % IACS |
Extra spring hard | Maximum cold-worked strength; only flat parts or very large-radius forming. | 462 | 572 | 3 | 168 HB | 26 % IACS |
What is C35000-M20?
C35000-M20 is C35000 supplied in the M20 condition — rod, shapes and forging stock supplied as hot-worked; choose for forged hardware to be finish-machined. C35000-M20 has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 340 MPa (49.3 ksi) — weaker than 74% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 97 GPa (14.1 Msi). C35000-M20 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 888°C (1,630 °F). H02 is the default condition FabDigit quotes; M20 is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 40%, better than 84% of copper alloy grades
- Forms and bends easily — 80/100, better than 83% of copper alloy grades
- Easy to machine — 75/100, better than 80% of copper alloy grades
Limitations
- Needs corrosion protection — 48/100, worse than 96% of copper alloy grades
- Low stiffness — 97 GPa (14.1 Msi), worse than 88% of copper alloy grades
- Difficult to weld — 20/100, worse than 88% of copper alloy grades
C35000-M20 properties
Typical room-temperature values for C35000-M20; 11 are specific to this condition. Other listed values are C35000 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C35000-M20 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 888°C (1,630 °F).
Mechanical12
C35000-M20 has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 340 MPa (49.3 ksi) — weaker than 74% of copper alloy grades. Elongation at break is 40% and the elastic modulus is 97 GPa (14.1 Msi).
Thermal6
C35000-M20 is rated for continuous service to 200°C (392 °F). It conducts heat at 115 W/m·K (66.4 BTU/hr·ft·°F), better than 61% of copper alloy grades. Thermal expansion is 20.3 µm/m·K (11.3 µin/in·°F).
Electrical3
C35000-M20 conducts electricity at 27 % IACS, better than 67% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (48/100), worse than 96% of copper alloy grades.
Sustainability4
Producing a kilogram of C35000-M20 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 60%.
Manufacturability8
C35000-M20's machinability is very good (75/100, better than 80% of copper alloy grades); weldability poor (20/100); formability very good (80/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C35000-M20
Is C35000 easy to machine?
Rated ~70% of C36000 — free-breaking chips with sharp positive-rake carbide or HSS, high speeds and light feeds; flood coolant keeps lead smearing off finished bores.
Can C35000 be welded?
Fusion welding is not recommended (lead causes hot cracking and zinc fume); join by soft soldering, silver brazing or mechanical fastening with good ventilation.
Can C35000 be formed, bent or molded?
Anneal (450–600 °C) or use O60/H01 for deep bends and rivet upsets; hot forge at 650–760 °C — cold formability drops sharply above H04.
What surface finishes work on C35000?
Buffs and mirror-polishes well, takes bright nickel/chrome, tin or gold plating; deburr and de-lead (acid pickle) before plating, or clear-lacquer to retard tarnish.
C35000 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 |
|---|---|---|
| Cuincludes Ag | 60 – 63 | 62 |
| Pb | 0.8 – 2 | 1.1 |
| Fe | ≤ 0.15 | — |
| Zn | balance | — |
C35000-M20 — frequently asked
What is C35000-M20 used for?
C35000-M20 is typically used for forged fittings, machined hardware and plumbing components. In short: forms better than C36000; medium-leaded forging brass; not fusion weldable.
What is the yield strength of C35000-M20?
C35000-M20 has a typical yield strength of 140 MPa (20.3 ksi) and a tensile strength of 340 MPa (49.3 ksi) — weaker than 74% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C35000-M20 easy to machine?
Yes — machinability is rated very good (75/100, better than 80% of copper alloy grades). Rated ~70% of C36000 — free-breaking chips with sharp positive-rake carbide or HSS, high speeds and light feeds; flood coolant keeps lead smearing off finished bores.
Can C35000-M20 be welded?
Not readily — weldability is rated poor (20/100). Fusion welding is not recommended (lead causes hot cracking and zinc fume); join by soft soldering, silver brazing or mechanical fastening with good ventilation.
What surface finishes work on C35000-M20?
Buffs and mirror-polishes well, takes bright nickel/chrome, tin or gold plating; deburr and de-lead (acid pickle) before plating, or clear-lacquer to retard tarnish.
Can C35000-M20 be formed, bent or molded?
Anneal (450–600 °C) or use O60/H01 for deep bends and rivet upsets; hot forge at 650–760 °C — cold formability drops sharply above H04.
What is the maximum service temperature of C35000-M20?
C35000-M20 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 C35000-H02 and C35000-O60?
H02 is the default condition — the stock general-purpose temper: best balance of strength, chip control and residual forming ability. O60: pick for maximum ductility: deep bending, forming, riveting and staking before final machining. Yield strength is 345 MPa in H02 versus 117 MPa in O60.
Sources
- ASTM B36/B36M — Brass Plate, Sheet, Strip and Rolled Bar — ASTM International (2018)
- ASTM B121/B121M — Leaded Brass Plate, Sheet, Strip and Rolled Bar — ASTM International (2020)
- CDA Alloy C35000 (Medium-Leaded Brass 62%) property sheet — Copper Development Association (2023)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol.13B — Corrosion: Materials (copper alloys) — 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.