Copper Alloy C37000
UNS C37000 · EN CW607N
C37000 is a leaded Muntz-metal brass (copper-zinc with a lead addition), listed in the wrought brass series C20000–C49999 and as CW607N.
Reference datasheet — C37000 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the H80 condition
C37000 tempers and conditions
C37000 is supplied in 6 conditions, soft to hard. H80 is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed to 0.050 mm grain size | Softest condition; choose when tube must be bent, expanded or flared after supply. | 124 | 350 | 45 | 80 HB | 27 % IACS |
As hot extruded | Pick for forging stock and large-section rod where maximum hot workability and ductility matter. | 138 | 372 | 45 | 85 HB | — |
Annealed to 0.025 mm grain size | Fine-grain anneal for a better surface finish after moderate forming or light machining. | 150 | 380 | 40 | 90 HB | 27 % IACS |
Light drawn | Light draw for straightness and tight tolerance while keeping useful ductility for flaring. | 240 | 415 | 25 | 100 HB | 26 % IACS |
Drawn, general purpose | Standard drawn stock: balanced strength, straightness and screw-machine performance. | 310 | 450 | 18 | 115 HB | — |
H80Default Hard drawn | Most commonly stocked condition for automatic screw-machine parts needing rigidity, straightness and clean chip break. | 380 | 500 | 10 | 130 HB | — |
What is C37000?
C37000 is a leaded Muntz-metal brass (copper-zinc with a lead addition), listed in the wrought brass series C20000–C49999 and as CW607N. It is chosen when a part is hot forged or hot extruded and then heavily machined: the default temper gives 380 MPa yield, 500 MPa tensile, 10% elongation, 130 HB (80 HRB) and a machinability score of 75. Cold formability is poor (score 15) and fusion welding is not recommended because zinc and lead volatilise, so joining is by soldering or brazing. For pure bar-stock screw-machine work, C36000 free-cutting brass remains the closer choice. C37000 has a density of 8.41 g/cm³ (0.304 lb/in³), lighter than 72% of copper alloy grades. It melts at 885°C (1,625 °F). C37000 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 500 MPa (72.5 ksi) — stronger than 77% of copper alloy grades. Elongation at break is 10% and the elastic modulus is 103 GPa (14.9 Msi).
What is C37000 used for?
- hot forgings
- machined hardware
- marine fittings
Advantages
- Easy to machine — 75/100, better than 80% of copper alloy grades
- High strength — 380 MPa (55.1 ksi), better than 77% of copper alloy grades
Limitations
- Needs corrosion protection — 52/100, worse than 93% of copper alloy grades
- Limited formability — 15/100, worse than 79% of copper alloy grades
- Limited ductility — 10%, worse than 76% of copper alloy grades
C37000 properties
Typical room-temperature values for C37000-H80; bars are the position among copper alloy grades.
Physical3
C37000 has a density of 8.41 g/cm³ (0.304 lb/in³), lighter than 72% of copper alloy grades. It melts at 885°C (1,625 °F).
Mechanical12
C37000 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 500 MPa (72.5 ksi) — stronger than 77% of copper alloy grades. Elongation at break is 10% and the elastic modulus is 103 GPa (14.9 Msi).
Thermal6
C37000 is rated for continuous service to 200°C (392 °F). It conducts heat at 123 W/m·K (71.1 BTU/hr·ft·°F), better than 70% of copper alloy grades. Thermal expansion is 20.8 µm/m·K (11.6 µin/in·°F).
Electrical3
C37000 conducts electricity at 26 % IACS, better than 63% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (52/100), worse than 93% of copper alloy grades.
Sustainability4
Producing a kilogram of C37000 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 70%.
Manufacturability8
C37000's machinability is very good (75/100, better than 80% of copper alloy grades); weldability poor (30/100); formability poor (15/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the copper alloy family
Yield strength against density for every copper alloy grade FabDigit runs. C37000 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C37000
Is C37000 easy to machine?
Excellent free-cutting behaviour (≈70% of C36000): use sharp positive-rake carbide or HSS, high speeds, light feeds; lead gives short chips and long tool life.
Can C37000 be welded?
Fusion welding not recommended (Zn and Pb volatilisation, hot cracking); join by soft soldering (excellent) or silver brazing with low-temperature fillers and adequate fume extraction.
Can C37000 be formed, bent or molded?
Excellent hot forging/extrusion at 650–760 °C; cold forming is poor — avoid tight bends or heavy staking in the H80 temper, anneal or specify OS050 for forming.
C37000 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 ≥ 99.6% per ASTM B135/B455 practice | 59 – 62 | 60.5 |
| Pbfree-machining addition | 0.8 – 1.5 | 1.1 |
| Fe | ≤ 0.15 | 0.05 |
| Znremainder, ≈38–40% | balance |
What surface finishes work on C37000?
Takes bright polishing, nickel/chrome plating and clear lacquer well; no anodizing — degrease and mildly acid-pickle before plating to remove lead smear.
Surface treatments FabDigit runs on copper alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Equivalent designations
Standards and trade names that resolve to Copper Alloy C37000 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CW607N
How much does C37000 cost?
C37000 is a premium-cost copper alloy ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
C37000 — frequently asked
What is C37000 used for?
C37000 is typically used for hot forgings, machined hardware and marine fittings. In short: free-cutting forging brass; hot-work plus machining grade; poor cold formability.
What is the yield strength of C37000?
C37000 has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 500 MPa (72.5 ksi) — stronger than 77% of copper alloy grades. Strength varies by condition: see the 6 listed tempers.
Is C37000 easy to machine?
Yes — machinability is rated very good (75/100, better than 80% of copper alloy grades). Excellent free-cutting behaviour (≈70% of C36000): use sharp positive-rake carbide or HSS, high speeds, light feeds; lead gives short chips and long tool life.
Can C37000 be welded?
Not readily — weldability is rated poor (30/100). Fusion welding not recommended (Zn and Pb volatilisation, hot cracking); join by soft soldering (excellent) or silver brazing with low-temperature fillers and adequate fume extraction.
What surface finishes work on C37000?
Takes bright polishing, nickel/chrome plating and clear lacquer well; no anodizing — degrease and mildly acid-pickle before plating to remove lead smear.
Can C37000 be formed, bent or molded?
Excellent hot forging/extrusion at 650–760 °C; cold forming is poor — avoid tight bends or heavy staking in the H80 temper, anneal or specify OS050 for forming.
What is the maximum service temperature of C37000?
C37000 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 C37000-H80 and C37000-OS050?
H80 is the default condition — most commonly stocked condition for automatic screw-machine parts needing rigidity, straightness and clean chip break. OS050: softest condition; choose when tube must be bent, expanded or flared after supply. Yield strength is 380 MPa in H80 versus 124 MPa in OS050.
How much does C37000 cost?
C37000 is a premium-cost copper alloy ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- C37000 Alloy Data Sheet (Free-Cutting Muntz Metal) — Copper Development Association (copper.org) (2023)
- ASTM B135 / B587 — Seamless Brass Tube — ASTM International (2019)
- EN 12164/12165 — CuZn39Pb1 (CW607N) — CEN (2016)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.