Copper Alloy C68100-ANN (Annealed)
Heat-treated state
UNS C68100
Post-braze stress relief (~250–300 °C) to reduce residual stress and ammonia-SCC risk; slightly lower strength.
Values for the ANN condition
Other C68100 tempers and conditions
C68100 is listed in 2 conditions; see the grade overview at C68100.
- ANN
- AW
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ANNThis page Annealed | Post-braze stress relief (~250–300 °C) to reduce residual stress and ammonia-SCC risk; slightly lower strength. | 160 | 390 | 30 | 90 HB | 26 % IACS |
AWDefault As-welded deposit | Default condition: properties of the undiluted braze-weld deposit on steel or copper alloys. | 190 | 415 | 25 | 105 HB | 25 % IACS |
What is C68100-ANN?
C68100-ANN is C68100 heat treated to ANN — post-braze stress relief (~250–300 °C) to reduce residual stress and ammonia-SCC risk; slightly lower strength. C68100-ANN has a yield strength of 160 MPa (23.2 ksi) and a tensile strength of 390 MPa (56.6 ksi) — weaker than 65% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 100 GPa (14.5 Msi). C68100-ANN has a density of 8.4 g/cm³ (0.303 lb/in³), lighter than 75% of copper alloy grades. It melts at 866°C (1,591 °F). AW is the default condition FabDigit quotes; ANN is available on request or by drawing note.
Advantages
- Readily welded — 80/100, better than 93% of copper alloy grades
- Forms and bends easily — 70/100, better than 80% of copper alloy grades
- Ductile — tolerates forming and impact — 30%, better than 75% of copper alloy grades
Limitations
- Low stiffness — 100 GPa (14.5 Msi), worse than 82% of copper alloy grades
C68100-ANN properties
Typical room-temperature values for C68100-ANN; 20 are specific to this condition. Other listed values are C68100 reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
C68100-ANN has a density of 8.4 g/cm³ (0.303 lb/in³), lighter than 75% of copper alloy grades. It melts at 866°C (1,591 °F).
Mechanical14
C68100-ANN has a yield strength of 160 MPa (23.2 ksi) and a tensile strength of 390 MPa (56.6 ksi) — weaker than 65% of copper alloy grades. Elongation at break is 30% and the elastic modulus is 100 GPa (14.5 Msi).
Thermal6
C68100-ANN 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 21 µm/m·K (11.7 µin/in·°F).
Electrical3
C68100-ANN conducts electricity at 26 % IACS, better than 63% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (58/100), worse than 76% of copper alloy grades.
Sustainability4
Producing a kilogram of C68100-ANN takes about 55 MJ of energy and emits 3.6 kg of CO₂ — less than 72% of copper alloy grades. Typical recycled content is 40%.
Manufacturability8
C68100-ANN's machinability is fair (40/100, better than 57% of copper alloy grades); weldability very good (80/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with C68100-ANN
Is C68100 easy to machine?
Deposits machine like unleaded 60/40 brass — sharp tools, positive rake, ~30 % of AISI 1212; avoid smearing with dull tools.
Can C68100 be welded?
Intended as the filler itself: braze weld with oxyacetylene (slightly oxidizing flame) or TIG at low heat input with brass flux; keep base metal below the filler liquidus to avoid fusion and zinc loss, and always use fume extraction.
Can C68100 be formed, bent or molded?
Rod is supplied cold drawn; can be lightly bent for feeding, but the alpha-beta structure limits sharp cold bends without a 400–500 °C anneal.
What surface finishes work on C68100?
Deposit polishes to a brass-gold color; can be tin, nickel or chrome plated, painted after abrasive cleaning, or lacquered to prevent tarnish — do not anodize.
C68100 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 |
|---|---|---|
| CuAWS A5.27 RBCuZn-C | 56 – 60 | 58 |
| Snstrengthening / deoxidation | 0.8 – 1.1 | 0.95 |
| Fegrain refinement | 0.25 – 1.2 | 0.7 |
| Mn | 0.01 – 0.5 | 0.15 |
| Sisuppresses zinc fuming | 0.04 – 0.15 | 0.1 |
| Pb | ≤ 0.05 | — |
| Al | ≤ 0.01 | — |
| Other, total | ≤ 0.5 | — |
| Znremainder, nominally ~40 % | balance | — |
C68100-ANN — frequently asked
What is C68100-ANN used for?
C68100-ANN is typically used for pipe and tank fabrication, structural steel braze welding and dissimilar metal joining. In short: low-fuming brass filler; balanced strength and ductility; good for dissimilar joints.
What is the yield strength of C68100-ANN?
C68100-ANN has a typical yield strength of 160 MPa (23.2 ksi) and a tensile strength of 390 MPa (56.6 ksi) — weaker than 65% of copper alloy grades. Strength varies by condition: see the 2 listed tempers.
Is C68100-ANN easy to machine?
Not especially — machinability is rated fair (40/100, better than 57% of copper alloy grades). Deposits machine like unleaded 60/40 brass — sharp tools, positive rake, ~30 % of AISI 1212; avoid smearing with dull tools.
Can C68100-ANN be welded?
Yes — weldability is rated very good (80/100). Intended as the filler itself: braze weld with oxyacetylene (slightly oxidizing flame) or TIG at low heat input with brass flux; keep base metal below the filler liquidus to avoid fusion and zinc loss, and always use fume extraction.
What surface finishes work on C68100-ANN?
Deposit polishes to a brass-gold color; can be tin, nickel or chrome plated, painted after abrasive cleaning, or lacquered to prevent tarnish — do not anodize.
Can C68100-ANN be formed, bent or molded?
Rod is supplied cold drawn; can be lightly bent for feeding, but the alpha-beta structure limits sharp cold bends without a 400–500 °C anneal.
What is the maximum service temperature of C68100-ANN?
C68100-ANN 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 C68100-AW and C68100-ANN?
AW is the default condition — default condition: properties of the undiluted braze-weld deposit on steel or copper alloys. ANN: post-braze stress relief (~250–300 °C) to reduce residual stress and ammonia-SCC risk; slightly lower strength. Yield strength is 190 MPa in AW versus 160 MPa in ANN.
Sources
- AWS A5.8/A5.8M — Specification for Filler Metals for Brazing and Braze Welding — American Welding Society (2019)
- AWS A5.27/A5.27M — Specification for Copper and Copper-Alloy Gas Welding Rods — American Welding Society (2017)
- UNS C68100 alloy data / copper alloy properties — Copper Development Association (copper.org) (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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.