1.ASTM A790 is a standard specification developed by the American Society for Testing and Materials (ASTM) that specifically addresses the composition and mechanical property requirements for seamless and welded ferritic/austenitic stainless steel pipes1. This standard specification covers the manufacturing process, heat treatment, sampling and testing requirements, and basic details of product marking. To ensure the integrity of the product, A790 pipes are usually subjected to static pressure or non-destructive electrical tests such as eddy current or ultrasonic testing (UT).
2.Application of ASTM A790
A790 pipes are mainly used in applications under general corrosive environments, with particular emphasis on their resistance to stress corrosion cracking. Although this material may become sensitive and prone to brittle cracking after long-term use at high temperatures, it exhibits good performance under general corrosive conditions.
3.Manufacturing process
A790 pipes can be manufactured by seamless or automatic welding processes, without adding any filler metal during the welding process. Thermal analysis is performed during the manufacturing process to determine the percentage of specified elements to ensure that the chemical composition of the material meets the standard requirements.
4. Supplementary requirements
For pipes that require a higher degree of testing, ASTM A790 also provides optional supplementary requirements. These supplementary requirements may include additional test items, which can be specified in the order.
5. Standard version
The versions of the ASTM A790 standard are updated over time, for example, A790/A790M-11 and A790/A790M-14a are versions of different years, and each version may have some editorial changes or updates.
6. Conclusion
In summary, ASTM A790 is an important standard specification that ensures the quality and performance of seamless and welded ferritic/austenitic stainless steel pipes for various industrial applications, especially in corrosive environments. The standard specifies the chemical composition, mechanical properties, manufacturing process and testing requirements of the material in detail to ensure the reliability and safety of the product.
