Copper Alloy Cu-DXP-H055
Hardness band
EN CR025A
H055 = hardness temper, 55–100 HV
Pick for strip/tube ordered by hardness in the half-hard range for stamping and moderate forming.
Values for the H055 condition
Other Cu-DXP tempers and conditions
Cu-DXP is listed in 9 conditions; see the grade overview at Cu-DXP.
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 |
H055This page 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-H055?
Cu-DXP-H055 is Cu-DXP heat treated to H055 — pick for strip/tube ordered by hardness in the half-hard range for stamping and moderate forming. Cu-DXP-H055 has a yield strength of 200 MPa (29 ksi) and a tensile strength of 265 MPa (38.4 ksi) — weaker than 54% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 118 GPa (17.1 Msi). Cu-DXP-H055 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). R220 is the default condition FabDigit quotes; H055 is available on request or by drawing note.
Advantages
- Readily welded — 86/100, better than 96% of copper alloy grades
- Conducts heat well — 288 W/m·K (166.4 BTU/hr·ft·°F), better than 83% of copper alloy grades
- High electrical conductivity — 69 % IACS, better than 82% of copper alloy grades
- Forms and bends easily — 62/100, better than 77% of copper alloy grades
Limitations
- Limited service temperature — 150°C (302 °F), worse than 96% of copper alloy grades
Cu-DXP-H055 properties
Typical room-temperature values for Cu-DXP-H055; 20 are specific to this condition. Other listed values are Cu-DXP reference data and may not represent this condition. Bars are the position among copper alloy grades.
Physical3
Cu-DXP-H055 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-H055 has a yield strength of 200 MPa (29 ksi) and a tensile strength of 265 MPa (38.4 ksi) — weaker than 54% of copper alloy grades. Elongation at break is 22% and the elastic modulus is 118 GPa (17.1 Msi).
Thermal6
Cu-DXP-H055 is rated for continuous service to 150°C (302 °F). It conducts heat at 288 W/m·K (166.4 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-H055 conducts electricity at 69 % IACS, better than 82% 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-H055 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-H055's machinability is poor (30/100, worse than 67% of copper alloy grades); weldability excellent (86/100); formability good (62/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Cu-DXP-H055
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.
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.
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) | — |
Cu-DXP-H055 — frequently asked
What is Cu-DXP-H055 used for?
Cu-DXP-H055 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-H055?
Cu-DXP-H055 has a typical yield strength of 200 MPa (29 ksi) and a tensile strength of 265 MPa (38.4 ksi) — weaker than 54% of copper alloy grades. Strength varies by condition: see the 9 listed tempers.
Is Cu-DXP-H055 easy to machine?
Not especially — machinability is rated poor (30/100, worse than 67% 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-H055 be welded?
Yes — weldability is rated excellent (86/100). 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-H055?
Not anodizable — solder/braze, tin or nickel plate, or polish and lacquer; bare surfaces patinate to brown/green in service.
Can Cu-DXP-H055 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-H055?
Cu-DXP-H055 is rated for continuous use to about 150°C (302 °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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.