Your ASTM A671 EFW Steel Pipe manufacturer in China

Frequently Asked Questions​

• 1. What is ASTM A671?

  ASTM A671 grade covers standard specifications for EFW pipe, which have a filler metal added. The ASTM A671 Pipe is made up of main constituents of 0.98 Manganese, 0.25-carbon max, 0.64 molybdenum, and 0.45 Silicon. They are produced with the help of high-quality plates having excellent strength and toughness.

• 2. What’s the difference between ASTM A671 and ASTM A672?

  A671 and A672 are EFW (Electric-Fusion Welded) Carbon Steel Pipes used for atmospheric and lower temperatures applications (A671) and high-pressure service at moderate temperatures (A672). As mentioned above, A671 is used for atmospheric and lower temperature application and A672 is used for high-pressure service applications at moderate temperature. However, if we compare the details e.g. A672 Gr.C60 & A671 Gr. CC60; the raw material plate used is same for both pipes & final mechanical properties are same. Heat treatment is same. The only difference between the 2 grades is only in the testing requirements. A672 requires weld sample drawn from a 500ft length of pipe and allows you to double the samples in case, original sample fails. A671 requires weld sample drawn from a 200ft length of pipe with no provision for a rejected weld.

• 3. What is ASTM A671 steel used for?

  ASTM A671 is used in a variety of applications where mild-temperature and atmospheric conditions are present, such as water supply systems, sewer systems, industrial piping, cooling water systems, and more. It is not intended for high-pressure or high-temperature applications.

• 4. What are the properties of ASTM A671?

  The properties of ASTM A671 steel pipes can vary depending on the specific grade and class of the pipe. ASTM A671 is a standard specification that covers a range of grades and classes of electric-fusion-welded steel pipes for atmospheric and lower-temperature service. Here are some of the key properties associated with ASTM A671 pipes:

  Mechanical Properties:

  Tensile Strength: ASTM A671 pipes exhibit varying tensile strength properties depending on the grade and class. Tensile strength measures the material’s ability to withstand axial loads or stretching forces.
  Yield Strength: Yield strength is the amount of stress at which the material undergoes plastic deformation. Like tensile strength, it varies based on the grade and class.
  Elongation: ASTM A671 pipes typically have specified elongation values, which indicate how much the material can stretch before it breaks. Elongation is expressed as a percentage of the original length.
  Chemical Composition: The chemical composition of ASTM A671 pipes varies depending on the grade and class. Common elements found in these pipes include carbon, manganese, phosphorus, sulfur, silicon, and trace amounts of alloying elements like molybdenum, chromium, and nickel in some low-alloy grades.

  Impact Properties: Some grades and classes of ASTM A671 pipes are subjected to impact testing to determine their resistance to brittle fracture, especially at lower temperatures. This is crucial for applications in colder environments.

  Hardness: ASTM A671 pipes may have specified hardness requirements, which can affect their resistance to wear and abrasion. Hardness is typically measured using the Rockwell or Brinell scale.

  Weldability: ASTM A671 pipes are designed for electric-fusion welding, and their weldability is an important property. Proper welding techniques and procedures should be followed to ensure the integrity of the welded joints.

  Corrosion Resistance: The corrosion resistance of ASTM A671 pipes is generally good, but it can vary depending on the specific alloying elements and environmental conditions. Additional coatings or treatments may be necessary for highly corrosive environments.

• 5. What's the material of ASTM A671?

  5.What’s the material of ASTM A671?
  The materials used for ASTM A671 pipes are typically carbon and low-alloy steels. The specific material and grade used depend on the intended application and the service conditions. Some of the common steel materials used for ASTM A671 pipes include:

  Carbon Steel: ASTM A671 pipes made from carbon steel are suitable for a wide range of applications where moderate strength and corrosion resistance are required. Common carbon steel grades used include A671 CC60, A671 CC65, A671 CC70, and others.

  Low-Alloy Steel: Low-alloy steels contain small amounts of alloying elements such as manganese, molybdenum, chromium, and nickel to improve mechanical properties. ASTM A671 low-alloy steel pipes are used in applications that require higher strength and toughness compared to carbon steel. Common low-alloy steel grades used include A671 C70, A671 C75, and A671 C80.

• 6. How to determine the wall thickness for an ASTM A671 pipe?

  To determine the appropriate wall thickness for an ASTM A671 pipe for a specific application, you should consult the ASTM A671 standard and consider factors such as:

  Service Conditions: The operating temperature and pressure of the piping system will influence the required wall thickness. Higher pressures and temperatures may require thicker-walled pipes to withstand the stress.

  Fluid Transported: The nature of the fluid being transported, including its corrosiveness and potential for erosion, can impact the selection of wall thickness to ensure durability and prevent leaks.

  Code and Regulatory Requirements: Depending on the industry and jurisdiction, there may be specific code or regulatory requirements that dictate the minimum wall thickness for certain applications.

  Safety Factors: Engineers often apply safety factors to account for uncertainties and variations in service conditions, which can influence the selection of wall thickness.

  Design Standards: The design standards and engineering calculations for a particular project will provide guidance on the required wall thickness to meet safety and performance criteria.

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