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| Наименование марки: | YUHONG |
| Номер модели: | ASTM B111 UNS C70600 Медно-никелевая бесшовная труба |
| MOQ: | 500 кг |
| Цена: | Подлежит обсуждению |
| Условия оплаты: | Л/К, Т/Т |
ASTM B111 UNS C70600 / CuNi 90/10 Temper O61 Copper Nickel Seamless Tube
ASTM B111 C70600 O61 seamless tube is not a generic commodity, but a sophisticated, engineered material solution. Its value lies in the deliberately balanced chemistry that creates a robust, self-healing surface film, the integrity of seamless construction, and its proven performance in the challenging, variable environment of flowing seawater and harsh coolants. The O61 temper is a specific guarantee of fit-for-purpose metallurgical condition and used in heat exchangers.
Chemical Composition of Copper Alloys
| Designation | Chemical Composition % | ||||||||
| Cu | Sn | Al | As | Ni | Fe | Mn | Pb max. | Zn | |
| C44300 | 70.0-73.0 | 0.9-1.2 | – | 0.02-0.06 | – | 0.06 max | – | 0.07 | Rem |
| C68700 | 76.0-79.0 | – | 1.8-2.5 | 0.02-0.06 | – | 0.06 max | – | 0.07 | Rem |
| C70400 | Rem | – | – | – | 4.8-6.2 | 1.3-1.7 | 0.3-0.8 | 0.05 | 1.0max |
| C70600 | Rem | – | – | – | 9.0-11.0 | 1.0-1.8 | 1.0max | 0.05 | 1.0max |
| C71500 | Rem | – | – | – | 29.0-33.0 | 0.4-1.0 | 1.0max | 0.05 | 1.0max |
| C71640 | Rem | – | – | – | 29.0-32.0 | 1.7-2.3 | 1.5-2.5 | 0.05 | 1.0max |
O61 (Temper): This is a critical but often overlooked spec. "O61" refers to a specific annealed temper achieved by a controlled process (heating to a minimum of 1000°F / 538°C) that results in a recrystallized grain structure. This is distinct from a soft, as-fabricated anneal. It provides an optimal balance: excellent ductility for tube expansion into tube sheets, sufficient strength for handling and operation, and most importantly, maximized resistance to stress corrosion cracking (SCC) in service. It is the preferred temper for most heat exchanger applications.
Equivalent Grades of Copper Alloys
| Material Designation | Corresponding Material Symbol | ||||
| GB/T8890 | ASTM B111 | BS2871 | JIS H3300 | DIN1785 | |
| Copper-Nickel | BFe10-1-1 | C70600 | CN102 | C7060 | CuNi10Fe1Mn |
| BFe30-1-1 | C71500 | CN107 | C7150 | CuNi30Mn1Fe | |
| (BFe30-2-2) | C71640 | CN108 | C7164 | CuNi30Fe2Mn2 | |
| (BFe5-1.5-0.5) | C70400 | – | – | – | |
| B7 | – | – | – | – | |
| Aluminums Brass | HAL77-2 | C68700 | CZ110 | C6870 | CuZn20Al2 |
| Admiralty Brass | HSn70-1 | C44300 | CZ111 | C4430 | CuZn28Sn1 |
| Boric Brass | Hsn70-18 | – | – | – | – |
| HSn70-1 AB | – | – | – | – | |
| Arsenical Brass | H68A | – | CZ126 | – | – |
| Brass Tube | H65/H63 | C28000/C27200 | CZ108 | C2800/C2700 | CuZn36/CuZn37 |
Tensile Requirements:
| Copper or Copper Alloy UNS NO. | Temper Designation | Tensile Strength | Yield Strength | |
| Standard | Former | min ksi | min ksi | |
| C44300 | O61 | annealed | 45 | 15 |
| C68700 | O61 | annealed | 50 | 18 |
| C70400 | H55 | light-drawn | 38 | 30 |
| C70600 | H55 | light-drawn | 45 | 15 |
| C71500 | O61 | annealed | 52 | 18 |
| C71640 | O61 | annealed | 63 | 25 |
Competitive Context: When to Choose It Over Alternatives
vs. Admiralty Brass (C44300): C70600 is superior in erosion-corrosion resistance, ammonia SCC resistance, and general seawater corrosion. It is the upgrade choice for more demanding duty.
vs. 70/30 CuNi (C71500): C71500 has better overall corrosion resistance (especially to high velocity) and strength, but at a ~20-30% cost premium. C70600 is often the cost-performance optimum for standard seawater services.
vs. Titanium Gr. 2: Titanium is unbeatable for extreme chloride/SCC environments and very high velocities. C70600 is chosen when biofouling resistance is desired (titanium is prone to biofilm), for compatibility with existing CuNi systems, or where first-cost is a major constraint.
vs. Super Duplex Stainless Steel (e.g., S32750): Super duplex offers immense strength and pitting resistance. C70600 is selected in systems with risk of under-deposit corrosion from sand/silt, where its inherent tolerance to low-flow conditions and its noble corrosion potential (less galvanic corrosion to other components) are beneficial.
Application
While used in power plant condensers, its unique profile makes it the engineered choice for:
Offshore & Marine Seawater Systems: Not just main condensers, but for cooler bundles on seawater lift pumps, high-pressure side-stream filters, and produced water coolers. Its resistance to biofouling and high-velocity seawater is key.
Desalination Plants: Specifically in Multi-Stage Flash (MSF) distiller brine heaters and heat rejection sections, where tolerance to chlorination and sulfides is required.
Shipbuilding: For lubricant coolers, charge air coolers, and central cooling system heat exchangers where reliability in polluted or variable salinity harbor water is critical.
Chemical Process Industries: Handling cooling media with trace sulfides or in ammonia environments, where stainless steels or other copper alloys would fail.
Geothermal and Brackish Water Cooling: Where water chemistry is aggressive but not fully representative of clean ocean water.
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