Phosphorus Deoxidised Copper Alloy 122 UNS-C12200 –High Residual Phosphorus Alloy
Chemical Composition
AS2738.2 – 1984, Compositions & Designations
| Copper (including silver) | Phosphorus |
| > 99.90% | 0.015 – 0.040% |
Equivalent Alloy Specifications
| Specification | Designation |
| UNS | C12200 |
| BSI | C106 |
| ISO | Cu-DHP |
| JIS | C1220 |
Australian Product Specifications
| Specification | Product Form |
| AS1432 | Copper Tubes for Water, Gas & Sanitation |
| AS1566 | Rolled Flat Products |
| AS1567 | Wrought Bars & Sections |
| AS1572 | Seamless Tubes for Engineering Purposes |
ASTM Product Specifications
| Specification | Title |
| B5 | High Conductivity Tough Pitch Copper Refinery Shapes |
| B42 | Seamless Copper Pipe, Standard Sizes |
| B68 | Seamless Copper Tube, Bright Annealed |
| B75 | Seamless Copper Tube |
| B88 | Seamless Copper Water Tube |
| B111 | Copper and Copper Alloy Seamless Condenser Tubes and Ferrule Stock |
| B152 | Copper Sheet, Strip, Plate and Rolled Bar |
| B187 | Copper Bar, Bus Bar, Rod and Shapes |
| B280 | Seamless Copper Tube for Air Conditioning and Refrigeration Field Service |
| B302 | Threadless Copper Pipe |
| B306 | Copper Drainage Tube (DWV) |
| B359 | Copper and Copper Alloy Seamless Condenser and Heat Exchanger Tubes With Integral Fins |
| B360 | Hard Drawn Copper Capillary Tube for Restrictor Applications |
| B379 | Phosphorized Coppers – Refinery Shapes |
| B395 | U Bend Seamless Copper and Copper Alloy Heat Exchanger and Condenser Tubes |
| B447 | Welded Copper Tube |
| B543 | Welded Copper and Copper Alloy Heat Exchanger Tube |
| B577 | Detection of Cuprous Oxide (Hydrogen Embrittlement Susceptibility) in Copper |
| B640 | Welded Copper and Copper Alloy Tube for Air Conditioning and Refrigeration Service |
| B698 | Seamless Copper and Copper Alloy Plumbing Pipe and Tube |
| B743 | Seamless Copper Tube in Coils |
| B837 | Seamless Copper Tube for Natural Gas and Liquified Petroleum (LP) Gas Fuel Distribution Systems |
Fabrication Properties
| Joining Technique | Suitability |
| Soldering | Excellent |
| Brazing | Excellent |
| Oxy Acetylene Welding | Good |
| Gas Shielded Arc Welding | Good |
| Coated Metal Arc Welding | Not Recommended |
| Resistance Welding – Spot | Fair |
| Resistance Welding – Seam | Fair |
| Fabrication Technique | Suitability |
| Capacity for Being Cold Worked | Excellent |
| Capacity for Being Hot Worked | Good |
| Hot Working Temperature | 750 – 950 °C |
| Annealing Temperature | 250 – 650 °C |
| Stress Relieving Temperature | 200 – 250 °C |
| Machinability Rating | 20% of free cutting brass |
| Polishing/Electroplating Finish | Excellent |
Mechanical Properties
AS1567, Wrought Rods, Bars & Sections
| Temper | Thickness | Grain Size | Minimum Tensile Strength | Minimum Elongation | Maximum Hardness | |
| Product | mm | mm | MPa | % | HV | |
| Plate & Rolled Bar | Annealed, M or O | 3.2 – 60.0 | – | 210 | 35 | 50* |
| Hard | 3.2 – 12.0 | – | 280 | 15 | 85* | |
| Sheet, Strip & Foil | Annealed, O4 | 0.025 – 0.045 | 220* | 45* | 60 | |
| 1/2 Hard | 0.15 – 3.2 | – | 245 | 10 | 75 – 90 | |
| Hard | 0.15 – 3.2 | – | 310 | 7 | 90 – 115 |
Typical
Available Forms Shanghai Capway are able to supply this alloy as sheet, strip & tube.
General Description C12200, Phosphorus deoxidised copper, has been made weldable and brazeable by deoxidising with phosphorus. It is widely used as flat products and tubing, especially where it is to be welded or brazed. Phosphorus significantly reduces the conductivity, which may go as low as 70% IACS, but also raises the softening temperature when work hardened and promotes fine grain size.
C12200 has almost exactly the same mechanical properties as the high purity copper alloys such as C11000. It has excellent deep drawing characteristics and resistance to pitting corrosion when exposed to severe weather and water environments.
Typical applications Tubes for hot & cold water, gas & heating installations, soil & waste pipes, storage tanks, cisterns & cylinders, rainwater goods, roofing, fascias, building facades, evaporators, heat exchangers, stills, vats, chemical equipment, anodes for electroplating baths.
Physical Properties
| Property | Metric Units | Imperial Units |
| Melting Point (Liquidus) | 1083°C | 1981°F |
| Melting Point (Solidus) | 1083°C | 1981°F |
| Density | 8.90 gm/cm³ @ 20°C | 0.321 lb/in³ @ 68°F |
| Specific Gravity | 8.90 | 8.90 |
| Coefficient of Thermal Expansion | 17.7 x 10 -6 / °C (20-300°C) | 9.83 x 10 -6 / °F (68-392°F) |
| Themal Conductivity | 293-364 W/m. °K @ 20°C | 169-211 BTU/ft³/ft/hr/°F @ 68°F |
| Thermal Capacity (Specific Heat) | 385 J/kg. °K @ 20°C | 0.092 BTU/lb/°F @ 68°F |
| Electrical Conductivity | 0.41-0.52 microhm?¹.cm?¹ @ 20°C | 70-90% IACS @ 68°F |
| Electrical Resistivity | 2.5-1.9 microhm.cm @ 20°C | 15-12 ohms (circ mil/ft)@ 68°F |
| Modulus of Elasticity (tension) | 115 GPa | 17 x 10 6 psi |
| Modulus of Rigidity (torsion) | 44 GPa | 6.4 x 10 6 psi |
| Poisson’s Ratio | 0.33 | 0.33 |
Corrosion Resistance
C12200 has similar corrosion resistance to C11000. It gives excellent resistance to weathering and very good resistance to many chemicals. It is often used specifically for corrosion resistance. It is suitable for use with most waters, and can be used underground because it resists soil corrosion. It resists non-oxidising mineral and organic acids, caustic solutions and saline solutions.
Depending on concentration and specific conditions of exposure, copper generally resists:
Acids: mineral acids such as hydrochloric and sulphuric acids; organic acids such as acetic acid (including acetates and vinegar), carbolic, citric, formic, oxalic, tartaric and fatty acids; acidic solutions containing sulphur, such as the sulphurous acid and sulphite solutions used in pulp mills.
Alkalies: fused sodium and potassium hydroxide; concentrated and dilute caustic solutions.
Salt solutions: aluminium chloride, aluminium sulphate, calcium chloride, copper sulphate, sodium carbonate, sodium nitrate, sodium sulphate, zinc sulphate.
Waters: all potable waters, many industrial and mine waters, seawater and brackish water.
Other media: The corrosion resistance of C12200 is not adequate for: ammonia, amines and ammonium salts; oxidizing acids such as chromic and nitric acids and their salts; ferric chloride; persulphates and perchlorates; mercury and mercury salts. Copper may also corrode in aerated non oxidising acids such as sulphuric and acetic acids, although it is practically immune from these acids if air is completely excluded. Copper is not suitable for use with acetylene, which can react to form an acetylide which is explosive.
Consult Shanghai Capway for your specific application.