ASTM A312 Vs ASTM A778: What’s The Difference?

Choosing the right type of stainless steel for your project is crucial to ensuring its success. You have plenty of options regarding stainless steel pipes, including ASTM A312 and ASTM A778. These stainless steel pipes have unique properties that make them ideal for specific applications. In this blog post, we will compare and contrast ASTM A312 and ASTM A778 pipes, so you can decide which one is right for your project.

What Are ASTM A312 And ASTM A778

ASTM A312 is an American Society for Testing and Materials (ASTM) specification which covers seamless, straight-seam welded, and cold-worked welded austenitic stainless steel pipe intended for high temperature and general corrosive service. The corresponding material in ASTM A778 is a ferritic/austenitic, duplex stainless steel pipe that has been annealed after welding. This pipe grade has higher corrosion resistance than standard austenitic grades such as 304L or 316L due to its higher chromium and low carbon content. It can be used in applications requiring superior strength at elevated temperatures, like chemical and food processing plants.

Difference Between ASTM A312 And ASTM A778

ASTM A312 and ASTM A778 are two different standards for manufacturing and testing stainless steel pipes. The main difference between these standards is that ASTM A312 covers manufacturing requirements for welded, seamless, and cold-worked austenitic stainless steel pipes. In contrast, ASTM A778 only covers requirements for electric fusion arc welded austenitic stainless steel pipes. Regarding chemical composition and mechanical properties, both standards require similar-grade materials to ensure the desired performance. However, there are some additional tests required by both standards that must be conducted to guarantee the integrity of each pipe. For example, whereas ASTM A312 requires a hydrostatic test before installation or repair work on any pipe with an outside diameter exceeding 8 inches (20 cm), no such requirement exists in ASTM A778 specifications.

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1.ASTM A312 is a specification for seamless, welded, and heavily cold-worked austenitic stainless steel pipe.

2.ASTM A778 is a specification for welded austenitic stainless steel tubing.

3.ASTM A312 and ASTM A778 are produced in various grades, including 304, 316, and 317.

4.The main difference between ASTM A312 and ASTM A778 is that ASTM A312 is produced as seamless or welded pipe, while ASTM A778 is only produced as welded tubing.

5.Another difference between ASTM A312 and ASTM A778 is that ASTM A312 can be used in high-temperature service, while ASTM A778 should not be used in service above 1000 degrees F.


In conclusion, choosing between ASTM A312 and ASTM A778 pipes depends on your project’s specific requirements. If you need a pipe that can withstand high temperatures and high-pressure environments, then ASTM A312 is the right choice. However, if you’re working on an industrial or architectural project that doesn’t require high-temperature resistance and needs to be cost-effective, ASTM A778 pipes could be a better option. Make sure you consider all the factors before making your final decision to ensure the success of your project.

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