Copper Alloy C27000-H10
Supply condition
UNS C27000 · ASTM B36 · EN CuZn35, CW508L · JIS C2700 · GB H65
H10 = extra spring hard
Maximum cold-worked strength for flat spring strip; essentially no formability and highest SCC sensitivity — stress relieve after forming.
Values for the H10 condition
Other C27000 tempers and conditions
C27000 is listed in 9 conditions; see the grade overview at C27000.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Choose for deep drawing, severe bending and spinning where maximum ductility is needed. | 115 | 340 | 55 | 60 HB | 27 % IACS |
As hot rolled | Low-cost mill condition for hot-extruded rod, sections and forging stock that will be machined or re-worked. | 140 | 360 | 45 | 70 HB | 27 % IACS |
Quarter hard | Light cold work for parts still needing moderate bending and forming with more stiffness than soft temper. | 275 | 395 | 43 | 105 HB | 27 % IACS |
H02Default Half hard | Default stocked temper: balanced strength and formability for hardware, stampings, fasteners and machined parts. | 340 | 430 | 23 | 125 HB | 27 % IACS |
Three-quarter hard | Use where higher yield strength is needed but shallow forming/bending across grain is still required. | 400 | 470 | 15 | 145 HB | 27 % IACS |
Full hard | Standard structural hard temper for flat springs, clips, terminals and stiff stamped parts with simple bends. | 425 | 525 | 8 | 155 HB | 26 % IACS |
Extra hard | Pick when high strength and stiffness matter and forming is limited to flat blanking or very generous bends. | 450 | 585 | 5 | 170 HB | 26 % IACS |
Spring hard | Spring temper strip for contacts, washers and light springs where elastic limit governs. | 470 | 620 | 4 | 180 HB | 26 % IACS |
H10This page Extra spring hard | Maximum cold-worked strength for flat spring strip; essentially no formability and highest SCC sensitivity — stress relieve after forming. | 490 | 650 | 3 | 188 HB | 26 % IACS |
What is C27000-H10?
C27000-H10 is C27000 supplied in the H10 condition — maximum cold-worked strength for flat spring strip; essentially no formability and highest SCC sensitivity — stress relieve after forming. C27000-H10 has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 650 MPa (94.3 ksi) — stronger than 88% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 105 GPa (15.2 Msi). C27000-H10 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 905°C (1,661 °F). H02 is the default condition FabDigit quotes; H10 is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 85/100, better than 92% of copper alloy grades
- High strength — 490 MPa (71.1 ksi), better than 88% of copper alloy grades
Limitations
- Limited service temperature — 100°C (212 °F), worse than 100% of copper alloy grades
- Needs corrosion protection — 44/100, worse than 99% of copper alloy grades
- Limited ductility — 3%, worse than 97% of copper alloy grades
- Limited formability — 10/100, worse than 89% of copper alloy grades
C27000-H10 properties
Typical room-temperature values for C27000-H10; 14 are specific to this condition. Other listed values are C27000 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C27000-H10 has a density of 8.47 g/cm³ (0.306 lb/in³), lighter than 68% of copper alloy grades. It melts at 905°C (1,661 °F).
Mechanical12
C27000-H10 has a yield strength of 490 MPa (71.1 ksi) and a tensile strength of 650 MPa (94.3 ksi) — stronger than 88% of copper alloy grades. Elongation at break is 3% and the elastic modulus is 105 GPa (15.2 Msi).
Thermal6
C27000-H10 is rated for continuous service to 100°C (212 °F). It conducts heat at 121 W/m·K (69.9 BTU/hr·ft·°F), better than 68% of copper alloy grades. Thermal expansion is 20.3 µm/m·K (11.3 µin/in·°F).
Electrical3
C27000-H10 conducts electricity at 26 % IACS, better than 63% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is fair (44/100), worse than 99% of copper alloy grades.
Sustainability4
Producing a kilogram of C27000-H10 takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 50%.
Manufacturability8
C27000-H10's machinability is fair (42/100, better than 59% of copper alloy grades); weldability fair (40/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C27000-H10
Is C27000 easy to machine?
Machinability ~30 % of free-cutting C36000 — gummy, long chips; use sharp positive-rake tools, high speed, light feed and good lubrication, or specify C37700/C36000 for high-volume turning.
Can C27000 be welded?
Best joined by soft soldering or silver brazing; resistance and GTAW welding are possible but zinc volatilises — use good fume extraction, low heat input and Si-bronze filler.
Can C27000 be formed, bent or molded?
Excellent cold formability in O60/H01 for deep drawing, spinning and bending; interstage anneal at 425–600 °C and stress relieve at 260–300 °C after severe forming to avoid season cracking.
What surface finishes work on C27000?
Polishes and buffs to a bright gold finish; readily nickel/chrome/gold plated or lacquered; not anodizable — use benzotriazole or clear coating to prevent tarnish.
C27000 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 |
|---|---|---|
| CuASTM B36 / B134 range for C27000 | 63 – 68.5 | 65 |
| Pbimpurity limit | ≤ 0.1 | — |
| Feimpurity limit | ≤ 0.07 | — |
| Zn | balance | — |
C27000-H10 — frequently asked
What is C27000-H10 used for?
C27000-H10 is typically used for hardware and fasteners, lamp and lighting fixtures, eyelets and rivets and stampings. In short: low-cost general-purpose brass; stamping and drawing grade; cheaper than cartridge brass.
What is the yield strength of C27000-H10?
C27000-H10 has a typical yield strength of 490 MPa (71.1 ksi) and a tensile strength of 650 MPa (94.3 ksi) — stronger than 88% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is C27000-H10 easy to machine?
Not especially — machinability is rated fair (42/100, better than 59% of copper alloy grades). Machinability ~30 % of free-cutting C36000 — gummy, long chips; use sharp positive-rake tools, high speed, light feed and good lubrication, or specify C37700/C36000 for high-volume turning.
Can C27000-H10 be welded?
With care — weldability is rated fair (40/100). Best joined by soft soldering or silver brazing; resistance and GTAW welding are possible but zinc volatilises — use good fume extraction, low heat input and Si-bronze filler.
What surface finishes work on C27000-H10?
Polishes and buffs to a bright gold finish; readily nickel/chrome/gold plated or lacquered; not anodizable — use benzotriazole or clear coating to prevent tarnish.
Can C27000-H10 be formed, bent or molded?
Excellent cold formability in O60/H01 for deep drawing, spinning and bending; interstage anneal at 425–600 °C and stress relieve at 260–300 °C after severe forming to avoid season cracking.
What is the maximum service temperature of C27000-H10?
C27000-H10 is rated for continuous use to about 100°C (212 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C27000-H02 and C27000-O60?
H02 is the default condition — default stocked temper: balanced strength and formability for hardware, stampings, fasteners and machined parts. O60: choose for deep drawing, severe bending and spinning where maximum ductility is needed. Yield strength is 340 MPa in H02 versus 115 MPa in O60.
Sources
- ASTM B36/B36M — Brass Plate, Sheet, Strip and Rolled Bar — ASTM International (2018)
- CDA Alloy Datasheet C27000 (Yellow Brass) — 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)
- EN 1652 / EN 12164 — CuZn35, CuZn36 (CW508L/CW507L) — 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.