Copper Alloy C65100
UNS C65100 · ASTM B98, B96 · EN CW115C · GB QSi3-1
C65100 is a low-silicon copper-silicon bronze (1.5–3.5% Si) covered by ASTM B98/B96 and EN CW115C, supplied as rod, wire, bolts, tube and plate in annealed through H08 tempers.
Reference datasheet — C65100 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 H04 condition
C65100 tempers and conditions
C65100 is supplied in 9 conditions, soft to hard. H04 is the default FabDigit quotes; the values on this page are for it.
Compare all 9 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Soft annealed | Softest condition — pick for deep drawing, heavy upsetting, hot/cold forging stock and maximum ductility. | 105 | 275 | 55 | 60 HB | 12 % IACS |
Annealed | Standard commercial annealed rod/bar temper — general fabrication, bending and machining before forming. | 120 | 290 | 50 | 65 HB | 12 % IACS |
Annealed to 0.035 mm grain size | Grain-size-controlled anneal for strip/sheet — good drawability with a fine, orange-peel-free surface. | 130 | 305 | 48 | 70 HB | 12 % IACS |
Light annealed | Partial/light anneal — stress relieved with slightly higher strength than full soft, still readily formable. | 160 | 325 | 42 | 80 HB | 12 % IACS |
Quarter hard | Light cold work — better yield strength than annealed while still allowing moderate bending and forming. | 240 | 360 | 30 | 100 HB | 12 % IACS |
Half hard | Balanced strength/ductility temper for general machined parts, shafts and moderately formed hardware. | 310 | 400 | 20 | 125 HB | 12 % IACS |
H04Default Full hard | Most commonly stocked rod/bar condition — best strength-to-cost for bolts, nuts, marine fasteners and machined fittings. | 380 | 455 | 13 | 150 HB | 12 % IACS |
Extra hard | High-strength wire/rod for load-bearing pins, rivets and screw stock where little further forming is needed. | 450 | 525 | 7 | 175 HB | 12 % IACS |
Spring hard | Maximum cold-worked strength for springs, clips and diaphragms; very limited bend formability. | 525 | 600 | 4 | 195 HB | 12 % IACS |
What is C65100?
C65100 is a low-silicon copper-silicon bronze (1.5–3.5% Si) covered by ASTM B98/B96 and EN CW115C, supplied as rod, wire, bolts, tube and plate in annealed through H08 tempers. It is the general-purpose silicon bronze, offering 380 MPa yield, 455 MPa tensile, 13% elongation, a weldability score of 92 and corrosion resistance rated 70, which suits marine, architectural and electrical hardware. Electrical conductivity is only 12% IACS, machinability is 30 and service temperature is limited to about 180 °C. Choose C66100 when machining volume dominates cost. C65100 has a density of 8.75 g/cm³ (0.316 lb/in³), lighter than 51% of copper alloy grades. It melts at 1,030°C (1,886 °F). C65100 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 455 MPa (66 ksi) — stronger than 77% of copper alloy grades. Elongation at break is 13% and the elastic modulus is 117 GPa (17 Msi).
What is C65100 used for?
- fasteners
- marine hardware
- architectural trim
- electrical hardware
Advantages
- Readily welded — 92/100, better than 99% of copper alloy grades
- High strength — 380 MPa (55.1 ksi), better than 77% of copper alloy grades
C65100 properties
Typical room-temperature values for C65100-H04; bars are the position among copper alloy grades.
Physical3
C65100 has a density of 8.75 g/cm³ (0.316 lb/in³), lighter than 51% of copper alloy grades. It melts at 1,030°C (1,886 °F).
Mechanical14
C65100 has a yield strength of 380 MPa (55.1 ksi) and a tensile strength of 455 MPa (66 ksi) — stronger than 77% of copper alloy grades. Elongation at break is 13% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C65100 is rated for continuous service to 180°C (356 °F). It conducts heat at 57 W/m·K (32.9 BTU/hr·ft·°F), worse than 64% of copper alloy grades. Thermal expansion is 17.9 µm/m·K (9.94 µin/in·°F).
Electrical3
C65100 conducts electricity at 12 % IACS, worse than 62% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (70/100), better than 76% of copper alloy grades.
Sustainability4
Producing a kilogram of C65100 takes about 58 MJ of energy and emits 3.9 kg of CO₂ — more than 61% of copper alloy grades. Typical recycled content is 40%.
Manufacturability7
C65100's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability excellent (92/100); formability good (55/100).
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. C65100 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C65100
Is C65100 easy to machine?
Gummy, stringy chips — rating ≈30% of free-cutting brass; use sharp positive-rake tools, high speed, generous feed and flood coolant to avoid built-up edge.
Can C65100 be welded?
Excellent with GTAW/GMAW using ERCuSi-A filler, argon shielding, low heat input and no preheat; resistance and brazing/soldering also very good.
Can C65100 be formed, bent or molded?
Annealed tempers cold head, draw and bend readily; anneal at 480–650 °C between heavy operations and hot work at 700–875 °C.
C65100 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 |
|---|---|---|
| Siprimary solid-solution strengthener | 0.8 – 2 | 1.5 |
| Mn | ≤ 0.7 | 0.3 |
| Fe | ≤ 0.8 | |
| Zn | ≤ 1.5 | |
| Pb | ≤ 0.05 | |
| CuCu + Ag, remainder | ≥ 96 (balance) |
What surface finishes work on C65100?
Takes a bright polish and chemical patina/statuary finishes; readily tin, nickel or chrome plated — anodizing does not apply.
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 C65100 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- ASTM
- B98B96
- EN / DIN / Werkstoff-Nr.
- CW115C
- GB (China)
- QSi3-1
How much does C65100 cost?
C65100 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.
C65100 — frequently asked
What is C65100 used for?
C65100 is typically used for fasteners, marine hardware, architectural trim and electrical hardware. In short: most weldable silicon bronze; general-purpose marine bronze; good cold-heading formability.
What is the yield strength of C65100?
C65100 has a typical yield strength of 380 MPa (55.1 ksi) and a tensile strength of 455 MPa (66 ksi) — stronger than 77% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is C65100 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% of copper alloy grades). Gummy, stringy chips — rating ≈30% of free-cutting brass; use sharp positive-rake tools, high speed, generous feed and flood coolant to avoid built-up edge.
Can C65100 be welded?
Yes — weldability is rated excellent (92/100). Excellent with GTAW/GMAW using ERCuSi-A filler, argon shielding, low heat input and no preheat; resistance and brazing/soldering also very good.
What surface finishes work on C65100?
Takes a bright polish and chemical patina/statuary finishes; readily tin, nickel or chrome plated — anodizing does not apply.
Can C65100 be formed, bent or molded?
Annealed tempers cold head, draw and bend readily; anneal at 480–650 °C between heavy operations and hot work at 700–875 °C.
What is the maximum service temperature of C65100?
C65100 is rated for continuous use to about 180°C (356 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C65100-H04 and C65100-O60?
H04 is the default condition — most commonly stocked rod/bar condition — best strength-to-cost for bolts, nuts, marine fasteners and machined fittings. O60: softest condition — pick for deep drawing, heavy upsetting, hot/cold forging stock and maximum ductility. Yield strength is 380 MPa in H04 versus 105 MPa in O60.
How much does C65100 cost?
C65100 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 B98/B98M Copper-Silicon Alloy Rod, Bar and Shapes — ASTM International (2019)
- ASTM B96/B96M Copper-Silicon Alloy Plate, Sheet, Strip and Rolled Bar — ASTM International (2016)
- CDA Alloy Datasheet C65100 (Low Silicon Bronze B) — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- ASM Handbook Vol. 13B — Corrosion: Materials — ASM International (2005)
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.