ASTM a691 pipe

ASTM A691 Pipe

What is ASTM A691 Pipe?

Metal alloy pipes are used in different specific applications that require certain levels of corrosion resistance, strength, and hardness. The pipe specifications govern the different properties of the metals like the chemical composition, mechanical properties, and dimensions. The ASTM A691 Pipe is any pipe made under this specification for carbon and alloy steel pipes. The composition of the material is chromium, molybdenum, carbon, manganese, phosphorus, sulfur, and silicon. Some of the grades also have vanadium.

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ASTM A691 Pipe Specification

ASTM A691 Pipe Properties

ASTM A691 Pipe Grades and Classes

What are a691 pipe material grades?

Even though the specification specifies the pipes for certain use cases, there are needs for minor details of the pipes. Also, the expensive variations don’t need to be used at all times. The a691 pipe material comes in grades that are further divisions of the specifications. There are 14 such grades within these specifications. They are CM65, CM70, CM75, CMSH70, CMS75, CMSH80, 0.5CR, 1CR, 1.25CR, 2.25CR, 3CR, 5CR, 9CR and 91CR. These grades share the common characteristics of the A691 material yet, have more specific characters inside each grade.

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What are the benefits of ASTM a691 class 22 steel pipe?

These pipes come in diameters ranging from ½ inches to 36 inches with wall thicknesses ranging from 3mm to 12mm. The ASTM a691 class 22 steel pipe also has different schedules from which you can choose based on your pressure and thickness needs. Since these pipes are available in round, square, rectangular, and hydraulic types, it is handy to choose one for your applications. Moreover, it is a corrosion-resistant, heat-resistant, and mild pressure-resistant class.

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is A691 alloy steel EFW pipe is corrosion resistance ?

A691 alloy steel EFW pipe is made up of carbon, manganese, phosphorus, sulfur, silicon, chromium, molybdenum, and vanadium in the composition. This makes the pipe strongly corrosion-resistant against most agents. They are in particular resistant to atmospheric corrosion, water corrosion, and mild acid corrosion.

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What are the classes of ASTM A691 Pipe?

ASTM A691 Chrome Moly Welded Pipe also has several classes inside each grade. There are classes starting from class 10 to class 73. Each class has a slightly different composition, specification, and use case. Yet, many of the classes can be used interchangeably. The main reason for the number of classes is to use only what is required with a cost-effective solution.

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what is the Post-Weld Heat-Treat Temperature Range of A691 alloy steel EFW pipe ?

ASTM a691 cl22 EFW pipes and pipes of other grades and classes can be treated after being welded upon. The welding sites have been exposed to uneven temperatures and are susceptible to developing cracks. With the heat treatment, the ASTM a691 seamless pipe can be stabilized. The heat treatment involves heating up the pipes to a certain temperature and then cooling them down to room temperature with the help of cool air or water.