Copper Alloy C68100
UNS C68100
C68100 is a low-fuming copper-zinc braze-welding filler with a modified iron, manganese and tin balance, from the same brass filler-rod family as RBCuZn grades.
Reference datasheet — C68100 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 AW condition
C68100 tempers and conditions
C68100 is supplied in 2 conditions, soft to hard. AW is the default FabDigit quotes; the values on this page are for it.
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
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 |
Supply forms, finishes and certifications
Ways C68100 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
FC | RB | Supply form |
BARE | Bare rod / wire, as-drawn | Surface finish |
What is C68100?
C68100 is a low-fuming copper-zinc braze-welding filler with a modified iron, manganese and tin balance, from the same brass filler-rod family as RBCuZn grades. It is used for braze welding steel and copper alloys and for dissimilar-metal joints, and is supplied as bare rod, flux-coated rod and annealed rod. Deposits give about 190 MPa yield, 415 MPa tensile, 25% elongation, 105 HB (62 HRB) and 25% IACS, with service capped at 200 °C. Deposit strength is below the C68000 manganese-bronze filler, so choose that grade when strength governs; zinc fume extraction is still required. C68100 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). C68100 has a yield strength of 190 MPa (27.6 ksi) and a tensile strength of 415 MPa (60.2 ksi) — weaker than 57% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 100 GPa (14.5 Msi).
What is C68100 used for?
- pipe and tank fabrication
- structural steel braze welding
- dissimilar metal joining
Advantages
- Readily welded — 80/100, better than 93% of copper alloy grades
Limitations
- Low stiffness — 100 GPa (14.5 Msi), worse than 82% of copper alloy grades
C68100 properties
Typical room-temperature values for C68100-AW; bars are the position among copper alloy grades.
Physical3
C68100 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 has a yield strength of 190 MPa (27.6 ksi) and a tensile strength of 415 MPa (60.2 ksi) — weaker than 57% of copper alloy grades. Elongation at break is 25% and the elastic modulus is 100 GPa (14.5 Msi).
Thermal6
C68100 is rated for continuous service to 200°C (392 °F). It conducts heat at 120 W/m·K (69.3 BTU/hr·ft·°F), better than 66% of copper alloy grades. Thermal expansion is 21 µm/m·K (11.7 µin/in·°F).
Electrical3
C68100 conducts electricity at 25 % IACS, better than 59% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (55/100), worse than 86% of copper alloy grades.
Sustainability4
Producing a kilogram of C68100 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's machinability is fair (45/100, better than 64% of copper alloy grades); weldability very good (80/100); 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. C68100 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C68100
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.
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 |
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.
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).
How much does C68100 cost?
C68100 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.
C68100 — frequently asked
What is C68100 used for?
C68100 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?
C68100 has a typical yield strength of 190 MPa (27.6 ksi) and a tensile strength of 415 MPa (60.2 ksi) — weaker than 57% of copper alloy grades. Strength varies by condition: see the 2 listed tempers.
Is C68100 easy to machine?
Reasonably — machinability is rated fair (45/100, better than 64% 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 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?
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 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?
C68100 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.
How much does C68100 cost?
C68100 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
- 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; 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.