ASTM B466 Pipe specification
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What is the ASTM 466 pipe specification cover?
There are many requirements for seamless pipes of many UNS standards that ASTM 466 pipe specification covers. ASME SB – 466 pipes and tubes are the American Society of Mechanical Engineers’ specifications that covers the unique UNS of copper and nickel alloys.
ASTM B466 seamless piping systems cover the requirements for many nickel-copper alloys that have different UNS or unified numbering system numbers. It includes UNS C 70400, UNS C 70600, UNS C 71000, UNS C 71500, UNS C 71520, and UNS C 72200. The specifications include manufacturing all these products using cast billets by piercing or hot extrusion followed by annealing and cold working.
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What are the standard tempers of ASTM B466m tubing?
ASTM B466m tube specification for Cu-Ni pipe and tube in straight lengths makes it suitable for general engineering requirements. There are different copper-nickel alloys with many UNS numbers like UNS Nos. C 70620, C 71520 etc are best for many applications.
The standard tempers of ASTM B 466 tubing specifications are 060, or soft annealed; H55, or light-drawn; H80, or hard-drawn; and HE80, or end annealed. Test performances and Rockwell hardness should confirm the ASTN B 466 specified values. The performance requirements include those from flattening, expansion, and Eddy Current tests.
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Are ASTM B466 seamless pipes suitable for general engineering purposes?
Yes. ASTM B 466 seamless pipes are suitable for general engineering purposes. It is because their specifications cover the requirements of a good deal of seamless copper-nickel alloys. The low macrofouling rates and excellent fabricability of ASTM B466 make it ideal for marine applications.
ASTM B 466 piping systems have high copper and nickel along with fortifying elements like manganese and iron also add up to their high strength and corrosion resistance. Hence, it is best for seawater applications and many corrosive FGD or flue gas desulfurization systems. Thus it helps to remove the sulfur dioxide from flue gas produced by furnaces, boilers, and others.
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What are the disadvantages of ASTM B466 material?
ASTM B466 material being copper-nickel alloys with varying compositions of 90-10, 70-30, and others are expensive. It is a significant disadvantage as there are many alloys with more iron content and reduced copper and nickel content to be cheaper. But B466 material covers the ASTM specifications for many copper-nickel alloys and is used for many high-end applications.
Another disadvantage of B466 material is the reduced biofouling capability of alloys with less copper content. Since copper has anti-microbial properties, having less in alloys with 70-30 composition will not be suitable for biofouling applications.
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How does the flattening test apply to ASTM b466 seamless tube?
Pipes and tubes have become an essential part of today’s world with use from infrastructure, nuclear plants to rockets. Hence using piping systems with no defects for a long time is critical for not causing any damage to property and life. And flattening test is one of the practical tests for finding such defects in seamless pipes and tubes.
The flattening test for ASTM B 466 seamless tube is by taking a sample from any part of it to flatten in the direction perpendicular to its longitudinal axis. The flattening gets done until reaching the value specified by the ASTM B 466 specifications. The primary principle for the flattening test is to determine the deformation ability of the seamless tubes.