Standard Overview
ASTM A733 is a technical standard for welded and seamless carbon steel and austenitic stainless steel pipe fittings issued by the The latest version, ASTM A733-16, was re-examined and released in 2022. The standard specifies in detail the material requirements, manufacturing process, dimensional tolerances and applicable scenarios of pipe fittings. It covers standard sizes from 1/8 inch to 12 inches, including ferrous metal and galvanized carbon steel pipe fittings, as well as austenitic stainless steel pipe fittings, which makes this standard widely used in various occasions and meets the needs of various industries.
Material classification and scope of application
Carbon steel pipe fittings
- Welded carbon steel: This is a material widely used in general piping systems, in accordance with ASTM A53/A53M and ASTM A333/A333M standards. ASTM A333/A333M is mainly used for low-temperature applications (such as liquefied natural gas equipment)
- Seamless carbon steel: Mainly suitable for ASTM A53/A53M (general application), A106/A106M (high temperature application) and A333/A333M (low temperature application), because the seamless design allows it to work normally under high temperature and high pressure, and can cope with special scenes and various overload working environments.
Austenitic stainless steel pipe fittings
In accordance with ASTM A312/A312M standards, the fittings are specially designed for high temperature and corrosive environments and are widely used in chemical design, food processing and other industries.
5. Synergy with other standards
Cooperation with other standards
ASTM A733 pipe fittings are only a fitting, and they must cooperate with other pipes to ensure the safety of the entire pipe system. The following are the main pipe standards used in cooperation with the ASTM A733 standard:
ASTM A53/A53M
This standard mainly involves general-purpose welded and seamless steel pipes, covering a variety of sizes and wall thicknesses, so it provides great compatibility for ASTM A733 pipe fittings, making the fittings widely used in industrial or water supply applications.
ASTM A333/A333M
This standard is specifically for low-temperature toughness pipes, suitable for relatively low temperature environments (-45℃ to -195℃), and is used in conjunction with ASTM A733 pipe fittings to ensure that the entire pipe system can still maintain normal operation in extremely low temperature environments.
ASTM A312/A312M:
This is a standard specifically for austenitic stainless steel corrosion-resistant pipes, mainly used in high temperature and corrosive environments. This type of standard pipe has favorable performance. When ASTM A733 pipe fittings are used with pipe materials of this standard, they can form a piping system with extremely excellent performance, meeting the engineering projects with strict requirements on corrosion resistance and heat resistance.
