Copper Alloy C27400
UNS C27400 · EN CW508L, CuZn37
C27400 is a 63/37 yellow brass (CuZn37, CW508L) in the wrought copper–zinc family, strengthened by cold work rather than by alloying additions.
Reference datasheet — C27400 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 H02 condition
C27400 tempers and conditions
C27400 is supplied in 8 conditions, soft to hard. H02 is the default FabDigit quotes; the values on this page are for it.
Compare all 8 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick for deep drawing, severe bending and spinning where maximum ductility is needed. | 125 | 340 | 55 | 60 HB | 28 % IACS |
Quarter hard | Pick when moderate strength must be combined with substantial forming or bending. | 270 | 385 | 43 | 95 HB | — |
H02Default Half hard | The general-purpose stock temper: good strength with enough ductility for stamping and 90° bends. | 340 | 425 | 23 | 125 HB | — |
Three-quarter hard | Pick for flat parts and light forming where higher yield strength is required than H02. | 395 | 470 | 12 | 145 HB | — |
Full hard | Pick for flat blanked/pierced parts, shims and contacts needing high strength and stiffness in service. | 425 | 510 | 8 | 155 HB | — |
Extra hard | Pick for thin flat springs, clips and wear surfaces where forming is limited to gentle radii. | 455 | 570 | 5 | 175 HB | — |
Spring hard | Pick for spring contacts, washers and detents requiring high elastic limit; form only across the rolling direction. | 490 | 620 | 3 | 185 HB | — |
Extra spring hard | Pick for the highest strength/elastic limit available in this alloy; essentially flat-form only. | 510 | 650 | 3 | 195 HB | — |
What is C27400?
C27400 is a 63/37 yellow brass (CuZn37, CW508L) in the wrought copper–zinc family, strengthened by cold work rather than by alloying additions. It gives a balanced combination of strength and cold workability — 340 MPa yield, 425 MPa tensile, 23% elongation and 125 HB (70 HRB) in the default condition — and is stocked as strip, sheet, rod and wire in tempers from O60 through H10 for hardware and stampings. Machinability is only about 30% of free-cutting brass, fusion welding is limited by zinc volatilisation, and service is capped near 150 °C, with cold-worked parts needing stress relief to avoid season cracking. Use C36000 when turning volume drives cost. C27400 has a density of 8.44 g/cm³ (0.305 lb/in³), lighter than 70% of copper alloy grades. It melts at 900°C (1,652 °F). C27400 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 425 MPa (61.6 ksi) — stronger than 71% of copper alloy grades. Elongation at break is 23% and the elastic modulus is 105 GPa (15.2 Msi).
What is C27400 used for?
- hardware
- stampings
- screws
- fittings
Advantages
- Polishes to a fine finish — 85/100, better than 92% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
C27400 properties
Typical room-temperature values for C27400-H02; bars are the position among copper alloy grades.
Physical3
C27400 has a density of 8.44 g/cm³ (0.305 lb/in³), lighter than 70% of copper alloy grades. It melts at 900°C (1,652 °F).
Mechanical12
C27400 has a yield strength of 340 MPa (49.3 ksi) and a tensile strength of 425 MPa (61.6 ksi) — stronger than 71% of copper alloy grades. Elongation at break is 23% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
C27400 is rated for continuous service to 150°C (302 °F). It conducts heat at 116 W/m·K (67 BTU/hr·ft·°F), better than 64% of copper alloy grades. Thermal expansion is 20.5 µm/m·K (11.4 µin/in·°F).
Electrical3
C27400 conducts electricity at 27 % IACS, better than 67% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 86% of copper alloy grades.
Sustainability4
Producing a kilogram of C27400 takes about 55 MJ of energy and emits 3.8 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 45%.
Manufacturability7
C27400's machinability is poor (32/100, worse than 57% of copper alloy grades); weldability fair (45/100); formability good (60/100).
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. C27400 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C27400
Is C27400 easy to machine?
Machinable but chip-forming (rating ~30% of free-cutting brass) — use sharp positive-rake tools, high speed and light feed; choose C36000 if turning volume matters.
Can C27400 be welded?
Resistance and brazing/soldering are excellent; fusion welding is only fair because zinc volatilises — use low-heat processes with ventilation and Si-bronze filler.
Can C27400 be formed, bent or molded?
Excellent cold formability in O60/H01 for deep drawing and bending; harder tempers need generous bend radii and stress-relief (250–300 °C) to avoid season cracking.
C27400 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 silver | 61 – 64 | 63 |
| Pbsmall intentional lead addition | 0.05 – 0.15 | 0.1 |
| Fe | ≤ 0.05 | |
| Znremainder, ~36–39% | balance |
What surface finishes work on C27400?
Polishes to a bright yellow finish, takes Ni/Cr/Ag electroplating and chemical patinas readily; lacquer or clear-coat to prevent tarnish (not anodizable).
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 C27400 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CW508LCuZn37
How much does C27400 cost?
C27400 is a high-cost copper alloy ($$$$), pricier than about 78% 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.
C27400 — frequently asked
What is C27400 used for?
C27400 is typically used for hardware, stampings, screws and fittings. In short: balanced strength and formability; general-purpose yellow brass; cold-workable to H10.
What is the yield strength of C27400?
C27400 has a typical yield strength of 340 MPa (49.3 ksi) and a tensile strength of 425 MPa (61.6 ksi) — stronger than 71% of copper alloy grades. Strength varies by condition: see the 8 listed tempers.
Is C27400 easy to machine?
Not especially — machinability is rated poor (32/100, worse than 57% of copper alloy grades). Machinable but chip-forming (rating ~30% of free-cutting brass) — use sharp positive-rake tools, high speed and light feed; choose C36000 if turning volume matters.
Can C27400 be welded?
With care — weldability is rated fair (45/100). Resistance and brazing/soldering are excellent; fusion welding is only fair because zinc volatilises — use low-heat processes with ventilation and Si-bronze filler.
What surface finishes work on C27400?
Polishes to a bright yellow finish, takes Ni/Cr/Ag electroplating and chemical patinas readily; lacquer or clear-coat to prevent tarnish (not anodizable).
Can C27400 be formed, bent or molded?
Excellent cold formability in O60/H01 for deep drawing and bending; harder tempers need generous bend radii and stress-relief (250–300 °C) to avoid season cracking.
What is the maximum service temperature of C27400?
C27400 is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C27400-H02 and C27400-O60?
H02 is the default condition — the general-purpose stock temper: good strength with enough ductility for stamping and 90° bends. O60: pick for deep drawing, severe bending and spinning where maximum ductility is needed. Yield strength is 340 MPa in H02 versus 125 MPa in O60.
How much does C27400 cost?
C27400 is a high-cost copper alloy ($$$$), pricier than about 78% 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
- ASTM B36/B36M — Brass Plate, Sheet, Strip and Rolled Bar — ASTM International (2018)
- CDA Alloy Datasheet C27400 (Yellow Brass) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- EN 1652 / CW508L CuZn37 wrought copper products — CEN (1997)
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.