Copper Alloy C66300
UNS C66300 · ASTM B592
C66300 is a tin-modified wrought brass covered by ASTM B592, supplied as strip in tempers from O60 through H14 including rolled spring tempers.
Reference datasheet — C66300 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 H08 condition
C66300 tempers and conditions
C66300 is supplied in 11 conditions, soft to hard. H08 is the default FabDigit quotes; the values on this page are for it.
Compare all 11 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Pick for deep drawing, severe forming or re-rolling before final temper rolling. | 145 | 375 | 45 | 85 HB | 27 % IACS |
Annealed to temper, half-hard level | Use where half-hard strength is needed together with a fully recrystallised, forming-friendly structure and low residual stress. | 275 | 450 | 25 | 60 HRB | — |
Half hard | General-purpose stamping temper when moderate strength plus some bend ductility is required. | 400 | 500 | 15 | 68 HRB | — |
Full hard | Standard stocked hard strip for fasteners, clips and lightly loaded flat springs. | 490 | 570 | 8 | 78 HRB | — |
Full hard and stress relieved | Choose when full-hard strength must be combined with low residual stress (flatness, reduced SCC risk in ammonia-bearing service). | 540 | 585 | 8 | 79 HRB | — |
Extra hard | Step up from full hard for higher elastic limit where only gentle forming (bends along grain) is needed. | 550 | 620 | 5 | 82 HRB | — |
H08Default Spring hard | Default stocked spring-strip temper: best balance of elastic limit and formability for stamped springs and contacts. | 600 | 660 | 3.5 | 85 HRB | — |
Spring temper and stress relieved | Spring temper with a low-temperature stress relief for higher elastic limit, better flatness and less relaxation in service. | 630 | 670 | 3.5 | 86 HRB | — |
Extra spring hard | For higher spring rate and load capacity in flat springs where bend radii can be kept large. | 640 | 700 | 3 | 88 HRB | — |
Extra spring temper and stress relieved | Extra-spring strip stabilised by stress relief for maximum elastic limit with controlled flatness and reduced SCC sensitivity. | 670 | 710 | 3 | 89 HRB | — |
Strain hardened, half hard | Maximum cold-rolled strength for very high spring loads in flat parts with minimal forming. | 690 | 740 | 2 | 90 HRB | — |
What is C66300?
C66300 is a tin-modified wrought brass covered by ASTM B592, supplied as strip in tempers from O60 through H14 including rolled spring tempers. It is used for springs, contacts and small precision stampings that need 600 MPa yield, 660 MPa tensile and 85 HRB with corrosion resistance better than plain brass. Elongation is only 3.5 % at the default temper and formability is low, so severe forms must be blanked from softer tempers; service is limited to 120 °C and machinability is about 35 % of free-cutting brass. C66200 forms better where lower strength is acceptable. C66300 has a density of 8.55 g/cm³ (0.309 lb/in³), lighter than 60% of copper alloy grades. It melts at 900°C (1,652 °F). C66300 has a yield strength of 600 MPa (87 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 94% of copper alloy grades. Elongation at break is 3.5% and the elastic modulus is 110 GPa (16 Msi).
What is C66300 used for?
- springs
- fasteners
- electrical contacts
- precision stampings
Advantages
- High strength — 600 MPa (87 ksi), better than 94% of copper alloy grades
Limitations
- Limited service temperature — 120°C (248 °F), worse than 100% of copper alloy grades
- Limited ductility — 3.5%, worse than 97% of copper alloy grades
C66300 properties
Typical room-temperature values for C66300-H08; bars are the position among copper alloy grades.
Physical3
C66300 has a density of 8.55 g/cm³ (0.309 lb/in³), lighter than 60% of copper alloy grades. It melts at 900°C (1,652 °F).
Mechanical11
C66300 has a yield strength of 600 MPa (87 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 94% of copper alloy grades. Elongation at break is 3.5% and the elastic modulus is 110 GPa (16 Msi).
Thermal6
C66300 is rated for continuous service to 120°C (248 °F). It conducts heat at 105 W/m·K (60.7 BTU/hr·ft·°F), better than 56% of copper alloy grades. Thermal expansion is 19.9 µm/m·K (11.1 µin/in·°F).
Electrical3
C66300 conducts electricity at 25 % IACS, better than 59% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 76% of copper alloy grades.
Sustainability4
Producing a kilogram of C66300 takes about 58 MJ of energy and emits 3.6 kg of CO₂ — more than 61% of copper alloy grades. Typical recycled content is 50%.
Manufacturability7
C66300's machinability is fair (35/100, better than 51% of copper alloy grades); weldability poor (30/100); formability poor (20/100).
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. C66300 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C66300
Is C66300 easy to machine?
Unleaded tin brass machines to roughly 30 % of free-cutting brass — use sharp positive-rake tools, high speed, light feed and emulsion coolant to avoid gummy chips.
Can C66300 be welded?
Not suited to fusion arc welding (zinc fume/porosity); join by resistance spot/seam welding, soft soldering or silver brazing with ventilation.
Can C66300 be formed, bent or molded?
Blank and form from O82/H02 for deep shapes; in spring tempers bend with the bend axis across the rolling direction and generous radii, then stress-relieve stamped springs at ~200–250 °C to set shape and cut relaxation.
C66300 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 |
|---|---|---|
| Curegistered range per CDA/ASTM listing for this Cu-Zn-Sn alloy — verify against the current standard before ordering | 68.5 – 71.5 | 70 |
| Sntin addition for strength and dezincification resistance | 2 – 3 | 2.5 |
| Feimpurity limit | ≤ 0.05 | |
| Pbimpurity limit | ≤ 0.05 | |
| Znremainder, nominally ~27 % | balance |
What surface finishes work on C66300?
Takes bright mechanical polishing; commonly tin-, nickel-, silver- or gold-plated for contacts, or lacquered/passivated to prevent tarnish. No anodising.
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 C66300 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B592
How much does C66300 cost?
C66300 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.
C66300 — frequently asked
What is C66300 used for?
C66300 is typically used for springs, fasteners, electrical contacts and precision stampings. In short: spring-temper tin brass; 600 MPa yield strip; low formability, high strength.
What is the yield strength of C66300?
C66300 has a typical yield strength of 600 MPa (87 ksi) and a tensile strength of 660 MPa (95.7 ksi) — stronger than 94% of copper alloy grades. Strength varies by condition: see the 11 listed tempers.
Is C66300 easy to machine?
Not especially — machinability is rated fair (35/100, better than 51% of copper alloy grades). Unleaded tin brass machines to roughly 30 % of free-cutting brass — use sharp positive-rake tools, high speed, light feed and emulsion coolant to avoid gummy chips.
Can C66300 be welded?
Not readily — weldability is rated poor (30/100). Not suited to fusion arc welding (zinc fume/porosity); join by resistance spot/seam welding, soft soldering or silver brazing with ventilation.
What surface finishes work on C66300?
Takes bright mechanical polishing; commonly tin-, nickel-, silver- or gold-plated for contacts, or lacquered/passivated to prevent tarnish. No anodising.
Can C66300 be formed, bent or molded?
Blank and form from O82/H02 for deep shapes; in spring tempers bend with the bend axis across the rolling direction and generous radii, then stress-relieve stamped springs at ~200–250 °C to set shape and cut relaxation.
What is the maximum service temperature of C66300?
C66300 is rated for continuous use to about 120°C (248 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C66300-H08 and C66300-O60?
H08 is the default condition — default stocked spring-strip temper: best balance of elastic limit and formability for stamped springs and contacts. O60: pick for deep drawing, severe forming or re-rolling before final temper rolling. Yield strength is 600 MPa in H08 versus 145 MPa in O60.
How much does C66300 cost?
C66300 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 B592 — Copper-alloy plate, sheet, strip and rolled bar (Cu-Zn based high-strength alloys) — ASTM International (2021)
- ASTM B601 — Temper Designations for Copper and Copper Alloys — ASTM International (2019)
- CDA/copper.org Standard Designations & Alloy Property Database — Copper Development Association (2023)
- 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.