Copper Alloy Cu-DXP
EN CR025A
Cu-DXP (CR025A) is a phosphorus-deoxidized copper with controlled residual phosphorus, balanced for forming and brazing and supplied in tube, fitting and strip form in tempers from annealed R220 through R250, R290, R360 and the H040/H055/H090 hard grades.
Reference datasheet — Cu-DXP 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 R220 condition
Cu-DXP tempers and conditions
Cu-DXP is supplied in 9 conditions, soft to hard. R220 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 |
|---|---|---|---|---|---|---|
As cast | Pick for remelt or as extrusion/rolling feedstock, the form in which Cu-DXP is actually traded under EN 1976/EN 1978. | 60 | 180 | 30 | 42 HB | 70 % IACS |
R220Default Annealed (soft), Rm ≥ 220 MPa | Default for tube, fittings and deep-drawn parts: maximum ductility, easiest bending and expansion. | 70 | 230 | 45 | 45 HB | 70 % IACS |
Hardness temper, 40–65 HV | Pick when the order is placed to a hardness band instead of a tensile band, e.g. sheet/strip for deep drawing. | 70 | 230 | 42 | 48 HB | 70 % IACS |
Thermomechanically controlled processed | Pick for hot-extruded or hot-rolled semis where dimensions matter and mechanical properties are not guaranteed. | 80 | 210 | 40 | 48 HB | 70 % IACS |
Half-hard, Rm ≥ 250 MPa | Pick for straight tube and fittings needing higher pressure rating while still allowing moderate bending. | 200 | 270 | 25 | 70 HB | 69 % IACS |
Hardness temper, 55–100 HV | Pick for strip/tube ordered by hardness in the half-hard range for stamping and moderate forming. | 200 | 265 | 22 | 70 HB | 69 % IACS |
Hard drawn, Rm ≥ 290 MPa | Pick for rigid straight tube and pressure lines where stiffness and hoop strength matter more than bendability. | 260 | 315 | 8 | 95 HB | 68 % IACS |
Hardness temper, 90–110 HV | Pick for hard-drawn tube/strip specified by hardness where wall stiffness and dent resistance are key. | 280 | 320 | 7 | 95 HB | 68 % IACS |
Extra hard drawn rod/wire, Rm ≥ 360 MPa | Pick for heavily drawn rod, wire or high-strength small-bore tube where maximum cold-worked strength is needed. | 320 | 370 | 4 | 110 HB | 67 % IACS |
What is Cu-DXP?
Cu-DXP (CR025A) is a phosphorus-deoxidized copper with controlled residual phosphorus, balanced for forming and brazing and supplied in tube, fitting and strip form in tempers from annealed R220 through R250, R290, R360 and the H040/H055/H090 hard grades. Engineers use it as an alternative to DHP/DLP coppers where high thermal conductivity (290 W/m·K), about 70 % IACS electrical conductivity and 45 % elongation are needed together with oxy-fuel brazing without hydrogen embrittlement. Annealed strength is low (70 MPa yield, 230 MPa tensile, 45 HB), maximum service temperature is about 200 °C and machinability is poor; DHP copper is the closest substitute. Cu-DXP 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). Cu-DXP has a yield strength of 70 MPa (10.2 ksi) and a tensile strength of 230 MPa (33.4 ksi) — weaker than 93% of copper alloy grades. Elongation at break is 45% and the elastic modulus is 117 GPa (17 Msi).
What is Cu-DXP used for?
- tube and fitting manufacture
- brazed assemblies
- hydraulic lines
Advantages
- Readily welded — 88/100, better than 97% 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
- Conducts heat well — 290 W/m·K (167.6 BTU/hr·ft·°F), better than 83% of copper alloy grades
- High electrical conductivity — 70 % IACS, better than 83% of copper alloy grades
Limitations
- Low strength — 70 MPa (10.2 ksi), worse than 93% of copper alloy grades
- Difficult to machine — 25/100, worse than 86% of copper alloy grades
Cu-DXP properties
Typical room-temperature values for Cu-DXP-R220; bars are the position among copper alloy grades.
Physical3
Cu-DXP 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).
Mechanical12
Cu-DXP has a yield strength of 70 MPa (10.2 ksi) and a tensile strength of 230 MPa (33.4 ksi) — weaker than 93% of copper alloy grades. Elongation at break is 45% and the elastic modulus is 117 GPa (17 Msi).
Thermal6
Cu-DXP is rated for continuous service to 200°C (392 °F). It conducts heat at 290 W/m·K (167.6 BTU/hr·ft·°F), better than 83% of copper alloy grades. Thermal expansion is 17.7 µm/m·K (9.83 µin/in·°F).
Electrical3
Cu-DXP conducts electricity at 70 % IACS, better than 83% of copper alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 57% of copper alloy grades.
Sustainability4
Producing a kilogram of Cu-DXP takes about 57 MJ of energy and emits 3.8 kg of CO₂ — less than 52% of copper alloy grades. Typical recycled content is 35%.
Manufacturability8
Cu-DXP's machinability is poor (25/100, worse than 86% of copper alloy grades); weldability excellent (88/100); 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. Cu-DXP is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Cu-DXP
Is Cu-DXP easy to machine?
Gummy and non-free-cutting (~20 % of AISI 1212): use sharp positive-rake tools, high speed, low feed and generous coolant; half-hard temper cuts cleaner than annealed.
Can Cu-DXP be welded?
Excellent for oxy-fuel, TIG and MIG because the residual phosphorus prevents hydrogen embrittlement; preheat heavy sections to offset the high thermal conductivity.
Can Cu-DXP be formed, bent or molded?
In R220 it bends, expands, flares and deep-draws readily; interstage anneal above ~450 °C after heavy cold work, and avoid ammonia-bearing environments on cold-worked parts.
Cu-DXP 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 |
|---|---|---|
| Presidual deoxidizing phosphorus, upper deoxidized range (above Cu-DHP) | 0.04 – 0.07 | 0.05 |
| Agcounted as copper | ≤ 0.02 | |
| Biimpurity limit | ≤ 5×10⁻⁴ | |
| Pbimpurity limit | ≤ 0.01 | |
| Oeffectively deoxidized | ≤ 0 | |
| CuCu + Ag, min 99.90 % per EN refined-copper practice | ≥ 99.9 (balance) |
What surface finishes work on Cu-DXP?
Not anodizable — solder/braze, tin or nickel plate, or polish and lacquer; bare surfaces patinate to brown/green in service.
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 Cu-DXP in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- CR025A
How much does Cu-DXP cost?
Cu-DXP 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.
Cu-DXP — frequently asked
What is Cu-DXP used for?
Cu-DXP is typically used for tube and fitting manufacture, brazed assemblies and hydraulic lines. In short: highly formable copper tube stock; braze-friendly deoxidized copper; DHP/DLP alternative grade.
What is the yield strength of Cu-DXP?
Cu-DXP has a typical yield strength of 70 MPa (10.2 ksi) and a tensile strength of 230 MPa (33.4 ksi) — weaker than 93% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is Cu-DXP easy to machine?
Not especially — machinability is rated poor (25/100, worse than 86% of copper alloy grades). Gummy and non-free-cutting (~20 % of AISI 1212): use sharp positive-rake tools, high speed, low feed and generous coolant; half-hard temper cuts cleaner than annealed.
Can Cu-DXP be welded?
Yes — weldability is rated excellent (88/100). Excellent for oxy-fuel, TIG and MIG because the residual phosphorus prevents hydrogen embrittlement; preheat heavy sections to offset the high thermal conductivity.
What surface finishes work on Cu-DXP?
Not anodizable — solder/braze, tin or nickel plate, or polish and lacquer; bare surfaces patinate to brown/green in service.
Can Cu-DXP be formed, bent or molded?
In R220 it bends, expands, flares and deep-draws readily; interstage anneal above ~450 °C after heavy cold work, and avoid ammonia-bearing environments on cold-worked parts.
What is the maximum service temperature of Cu-DXP?
Cu-DXP 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 Cu-DXP-R220 and Cu-DXP-R360?
R220 is the default condition — default for tube, fittings and deep-drawn parts: maximum ductility, easiest bending and expansion. R360: pick for heavily drawn rod, wire or high-strength small-bore tube where maximum cold-worked strength is needed. Yield strength is 70 MPa in R220 versus 320 MPa in R360.
How much does Cu-DXP cost?
Cu-DXP 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
- EN 1976 — Copper and copper alloys: cast unwrought copper products — CEN (2012)
- EN 1978 — Copper cathodes — CEN (1998)
- EN 1173 — Copper and copper alloys: material condition designation — CEN (2008)
- EN 12735-1 / EN 1057 — Seamless round copper tubes for air conditioning, refrigeration and water — CEN (2016)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
- C12200 / Cu-DHP phosphorus-deoxidized copper alloy data — Copper Development Association (copper.org) (2023)
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.