UNS C12200 copper
Specifying phosphorus-deoxidized C12200 by product form, temper, conductivity basis, joining route and service requirements.
Tags: materials, copper, deoxidized-copper
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C12200 is phosphorus-deoxidized copper, commonly called Cu-DHP.
Identity and chemistry
Aurubis's Cu-DHP sheet specifies at least 46 MS/m (79% IACS) in the soft condition. KME's rolled product gives 47 MS/m (81% IACS) typical in the annealed condition at 20°C, with 330 W/(m·K) thermal conductivity. Confirm delivered conductivity and measurement temperature when either property governs. Aurubis soft-condition limit, KME annealed rolled-product data
Aurubis Stolberg's Cu-DHP sheet, marked EN_2026_01, lists comparable designations UNS C12200, EN CW024A and JIS C1220. It gives minimum 99.90% Cu and 0.015–0.040% P, and explains that residual phosphorus reduces conductivity while the material offers good forming and joining behavior. Treat the cross-reference as an alloy-identification aid, not a declaration that every product standard has identical delivery and acceptance requirements. Aurubis Stolberg, Cu-DHP material datasheet
Unit conversion: 0.015–0.040 mass% phosphorus equals 150–400 ppm by mass, because 1% equals 10,000 ppm. This is a range, not a fixed nominal addition or a certificate for a supplied batch. Keep the analytical basis and applicable specification with chemistry results.
Wieland Small Tube Products identifies its Alloy 122 as C12200/Cu-DHP/CW024A and lists multiple tube-related standards and delivery forms. That breadth reinforces a procurement distinction: specifying C12200 chemistry does not choose between a straight tube, coil or fabricated shape, or select the governing product standard. Its undated webpage is not assigned a publication date from its copyright footer. Wieland Small Tube Products, Copper Alloy 122
Product form and temper are part of the requirement
The Copper Development Association's Copper Tube Handbook, printed ©2024, publication A4015-24/23, describes drawn and annealed tube as the trade's “hard” and “soft” conditions. It also distinguishes standard plumbing tube sizing from ACR tube designation: ACR is identified by actual outside diameter. Preserve tube type, actual dimensions, wall thickness and temper rather than assuming a nominal size specifies them all. CDA, Copper Tube Handbook, Standard Tubes
For rolled products, Aurubis Finland's undated Pori Cu-DHP sheet separately reports these conditions:
| Condition | Tensile strength Rm | 0.2%-proof/yield entry | Elongation A50 / A |
|---|---|---|---|
| H040 / R220 | 220–260 MPa | Maximum 140 MPa | Minimum 33 / 42% |
| H065 / R240 | 240–300 MPa | Minimum 180 MPa | Minimum 8 / 15% |
| H090 / R290 | 290–360 MPa | Minimum 250 MPa | Minimum 4 / 6% |
The elongation heading separates 0.1 to less than 2.5 mm thickness from 2.5 mm and above, using A50 and A respectively. The sheet expressly says yield, elongation and hardness entries are typical for each temper and its information is not for purchase specification. Therefore, even a row printed with “minimum” or “maximum” cannot silently become the contractual acceptance basis. Match the product specification, specimen and certificate. Aurubis Finland, Pori Cu-DHP sheet
Do not translate an EN rolled-product condition directly into an ASTM tube temper without checking both standards. Cold forming, heating and joining also require assessment against the final required condition.
Conductivity: preserve the qualification
The Aurubis Stolberg sheet specifies electrical conductivity at least 46 MS/m / 79% IACS, explicitly applying to the soft condition only. It further says conductivity depends on composition, cold deformation and grain size. These conditions belong beside the number; it is not a universal C12200 value independent of processing. Aurubis Stolberg, physical properties and conductivity note
KME's rolled-product sheet, whose actual footer reads Cu-DHP_10_2020 despite its 2021 filename, gives typical annealed values at 20 °C of 47 MS/m, 81% IACS, and 330 W/(m·K) thermal conductivity. A typical value and another supplier's qualified lower limit are different data categories. Neither replaces an agreed conductivity test on the delivered product. KME, C12200 Cu-DHP datasheet
Forming and joining
KME rates cold forming, soldering, brazing and gas-shielded arc welding favorably, while identifying resistance welding and machining as less suitable. It also identifies resistance to hydrogen embrittlement. These are process-selection indications for its Cu-DHP material, not qualified parameters for every joint, tool or atmosphere. Confirm tooling, joint design, filler/flux system, cleaning and any final-condition changes for the application. KME, fabrication characteristics
The CDA handbook requires the corresponding annealed pressure rating when drawn tube is joined by brazing or welding. Thus, the incoming hard-tube condition cannot be retained as the pressure-rating basis after a joining process that softens it. Select the complete system's rating from the applicable tube, fitting, joint and temperature requirements rather than choosing the highest published tube number. CDA, Copper Tube Handbook, pressure-rating notes
Seamless, welded and service-qualified products differ
ASTM's public B447-12a(2021) abstract covers welded copper tube with a longitudinal seam free of filler metal and lists C12200 among the permitted compositions. It distinguishes as-welded, welded-and-annealed, welded-and-cold-drawn and fully finished tempers. Consequently, a chemistry match does not establish whether the ordered product is seamless or welded, or which final condition applies. Use the required product standard and edition explicitly. ASTM, B447 welded copper tube scope and abstract
Environmental suitability also needs more than a general copper corrosion claim. Aurubis Stolberg specifically lists ammonia, certain halide/cyanide/hydrogen-sulfide environments, oxidizing acids and seawater—especially at high flow—as concerns. Assess actual fluid chemistry, temperature, velocity, contaminants and joint materials; an application list is not approval for arbitrary chemical or marine service. Aurubis Stolberg, corrosion guidance
Purchase and release record
An actionable order states alloy, product standard/edition, form, dimensions and tolerances, final temper, surface/cleanliness requirements, certification and required tests. For tubing, retain manufacturing route and joint-system requirements. For a formed or brazed part, inspect the final geometry and material condition rather than relying only on incoming stock data.
Keep supplier typical values, specification requirements and batch results visibly separate. A C12200 certificate does not by itself establish oxygen-service cleanliness, drinking-water certification, a medical-gas product requirement or a complete pressure-system approval. Verify those requirements on the actual finished product and assembly.