Copper Alloy C10300
UNS C10300 · EN CW020A
C10300 (Cu-OFP, CW020A) is an oxygen-free copper with a small controlled phosphorus addition that improves resistance to hydrogen embrittlement while holding conductivity at 101 % IACS.
Reference datasheet — C10300 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 O60 condition
C10300 tempers and conditions
C10300 is supplied in 14 conditions, soft to hard. O60 is the default FabDigit quotes; the values on this page are for it.
Compare all 14 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot rolled and annealed | Heavy plate and bar softened after hot rolling for maximum conductivity, machining stability and formability. | 62 | 225 | 48 | 40 HB | 101 % IACS |
O60Default Soft annealed | Baseline soft temper for maximum conductivity, deep drawing, bending and brazed/vacuum assemblies. | 69 | 230 | 45 | 42 HB | 101 % IACS |
As hot rolled | Mill temper of hot-rolled plate/bar and bus bar where surface finish and flatness matter more than temper control. | 90 | 235 | 40 | 45 HB | 101 % IACS |
Light annealed | Partially softened temper when a little more strength than dead-soft is wanted with good formability. | 100 | 240 | 40 | 48 HB | 101 % IACS |
1/8 hard | Very light cold work for gaskets and formed parts needing slightly more spring-back control than annealed. | 170 | 250 | 30 | 60 HB | 100.5 % IACS |
Light drawn | Lightly drawn tube or rod: stiffer than annealed but still bendable by hand tooling. | 180 | 260 | 25 | 70 HB | 100 % IACS |
Quarter hard | Quarter-hard strip/sheet balancing moderate strength with 90° bending in most directions. | 205 | 262 | 25 | 68 HB | 100 % IACS |
Half hard | Most-stocked cold-worked sheet/bar temper: usable strength with limited forming (gentle bends). | 245 | 280 | 14 | 78 HB | 100 % IACS |
Three-quarter hard | Intermediate step to full hard when a flatter, stiffer strip is needed but full hard is too brittle to form. | 265 | 295 | 10 | 85 HB | 99.5 % IACS |
Hard drawn | Drawn-to-size hard rod/wire/tube for rigid conductors, machined electrodes and pressure tubing. | 275 | 315 | 10 | 90 HB | 99 % IACS |
Full hard | Standard hard temper for bus bar, terminals and flat parts needing stiffness and flatness with minimal forming. | 280 | 315 | 6 | 92 HB | 99 % IACS |
Extra hard | Extra-hard strip for flat springs, contacts and stamped parts where elastic stiffness dominates. | 315 | 345 | 4 | 100 HB | 98.5 % IACS |
Spring hard | Spring temper strip for conductive springs, shields and clips; forming limited to large-radius bends. | 340 | 365 | 4 | 105 HB | 98 % IACS |
Extra spring hard | Maximum cold-worked strength for thin conductive spring strip; essentially non-formable and softens easily on heating. | 350 | 380 | 3 | 110 HB | 97.5 % IACS |
What is C10300?
C10300 (Cu-OFP, CW020A) is an oxygen-free copper with a small controlled phosphorus addition that improves resistance to hydrogen embrittlement while holding conductivity at 101 % IACS. Annealed material gives 69 MPa yield, 230 MPa tensile, 45 % elongation, 42 HB and 391 W/m·K, with service to 300 °C, and it is stocked in tempers from O60 through H80 as plate, sheet, tube and rod. The main limits are poor machinability (about 20 % of AISI 1212), softening in the weld HAZ and no anodizing. C10100 or C10200 serve where the phosphorus addition is not wanted. C10300 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,083°C (1,981 °F). C10300 has a yield strength of 69 MPa (10 ksi) and a tensile strength of 230 MPa (33.4 ksi) — weaker than 96% of copper alloy grades. Elongation at break is 45% and the elastic modulus is 117 GPa (17 Msi).
What is C10300 used for?
- nuclear waste canisters
- high-integrity welded conductors
- hydrogen-service piping
Advantages
- Conducts heat well — 391 W/m·K (225.9 BTU/hr·ft·°F), better than 98% of copper alloy grades
- High electrical conductivity — 101 % IACS, better than 98% of copper alloy grades
- Readily welded — 85/100, better than 95% of copper alloy grades
- Forms and bends easily — 95/100, better than 94% of copper alloy grades
- Ductile — tolerates forming and impact — 45%, better than 91% of copper alloy grades
Limitations
- Low strength — 69 MPa (10 ksi), worse than 96% of copper alloy grades
- Difficult to machine — 22/100, worse than 94% of copper alloy grades
C10300 properties
Typical room-temperature values for C10300-O60; bars are the position among copper alloy grades.
Physical3
C10300 has a density of 8.94 g/cm³ (0.323 lb/in³), heavier than 90% of copper alloy grades. It melts at 1,083°C (1,981 °F).
Mechanical13
C10300 has a yield strength of 69 MPa (10 ksi) and a tensile strength of 230 MPa (33.4 ksi) — weaker than 96% of copper alloy grades. Elongation at break is 45% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
C10300 is rated for continuous service to 300°C (572 °F). It conducts heat at 391 W/m·K (225.9 BTU/hr·ft·°F), better than 98% of copper alloy grades. Thermal expansion is 17.6 µm/m·K (9.78 µin/in·°F).
Electrical3
C10300 conducts electricity at 101 % IACS, better than 98% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (65/100), better than 58% of copper alloy grades.
Sustainability4
Producing a kilogram of C10300 takes about 57 MJ of energy and emits 3.6 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 25%.
Manufacturability8
C10300's machinability is poor (22/100, worse than 94% of copper alloy grades); weldability excellent (85/100); formability excellent (95/100).
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. C10300 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with C10300
Is C10300 easy to machine?
Gummy and low-rated (~20% of AISI 1212): use sharp positive-rake tools, high speed, generous coolant and avoid dwell to prevent smearing.
Can C10300 be welded?
Excellent for GTAW/GMAW/EBW and brazing — the P deoxidation prevents hydrogen embrittlement; high heat input or preheat needed because of the 390 W/m·K conductivity.
Can C10300 be formed, bent or molded?
Annealed temper deep draws, spins and bends superbly; hard tempers need large bend radii and interstage annealing at 400–600 °C.
C10300 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 |
|---|---|---|
| Pcontrolled low-phosphorus deoxidation per ASTM B224 / EN Cu-OFP | 0 – 0.01 | 0 |
| Otypical residual oxygen, oxygen-free melting practice | ≤ 0 | 5×10⁻⁴ |
| CuCu + Ag, min; oxygen-free (no deoxidant residue other than P) | ≥ 99.95 (balance) |
What surface finishes work on C10300?
Not anodisable — electroplate Ni/Ag/Sn, chemically brighten or polish; bare surfaces tarnish and benefit from lacquer or benzotriazole treatment.
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 C10300 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CW020A
- Similar grades
- Cu-OFP
How much does C10300 cost?
C10300 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.
C10300 — frequently asked
What is C10300 used for?
C10300 is typically used for nuclear waste canisters, high-integrity welded conductors and hydrogen-service piping. In short: weld-grade oxygen-free copper; 101 % IACS conductivity; hydrogen-embrittlement resistant.
What is the yield strength of C10300?
C10300 has a typical yield strength of 69 MPa (10 ksi) and a tensile strength of 230 MPa (33.4 ksi) — weaker than 96% of copper alloy grades. Strength varies by condition: see the 14 listed tempers.
Is C10300 easy to machine?
Not especially — machinability is rated poor (22/100, worse than 94% of copper alloy grades). Gummy and low-rated (~20% of AISI 1212): use sharp positive-rake tools, high speed, generous coolant and avoid dwell to prevent smearing.
Can C10300 be welded?
Yes — weldability is rated excellent (85/100). Excellent for GTAW/GMAW/EBW and brazing — the P deoxidation prevents hydrogen embrittlement; high heat input or preheat needed because of the 390 W/m·K conductivity.
What surface finishes work on C10300?
Not anodisable — electroplate Ni/Ag/Sn, chemically brighten or polish; bare surfaces tarnish and benefit from lacquer or benzotriazole treatment.
Can C10300 be formed, bent or molded?
Annealed temper deep draws, spins and bends superbly; hard tempers need large bend radii and interstage annealing at 400–600 °C.
What is the maximum service temperature of C10300?
C10300 is rated for continuous use to about 300°C (572 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between C10300-O60 and C10300-H10?
O60 is the default condition — baseline soft temper for maximum conductivity, deep drawing, bending and brazed/vacuum assemblies. H10: maximum cold-worked strength for thin conductive spring strip; essentially non-formable and softens easily on heating. Yield strength is 69 MPa in O60 versus 350 MPa in H10.
How much does C10300 cost?
C10300 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 B224 Standard Classification of Coppers — ASTM International (2021)
- ASTM B152/B152M Copper Sheet, Strip, Plate and Rolled Bar — ASTM International (2019)
- EN 13601 / EN 1652 Copper and copper alloys — Cu-OFP (CW020A) — CEN (2013)
- CDA Alloy Database — C10300 Oxygen-Free Extra-Low Phosphorus Copper — Copper Development Association (2023)
- ASM Handbook Vol. 2 — Properties of Copper and Copper 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.