Difference Between Aisi And Astm


What Is The Difference Between Aisi And Astm Standards

ASTM stands for the American Society for Testing and Materials. The AISI stands for the American Iron and Steel Institute. While both these agencies produce and maintain standards for metallic materials and products, the AISI is more specific on iron steel while the ASTM has a larger area of coverage for materials such as petroleum, rubber and more.There are over 12000 standards of ASTM used today all around the world. There are over 30000 technical experts worldwide that are contributing to the management of the ASTM standards. It is an institute that produces testing methods, classifications of materials, specifications and guidance for both consumers and suppliers.

The society was first put in place by Charles B Dudley, Ph.D in 2001 and it has been operating ever since. There are several offices worldwide in Peru, China, Washington, Canada and in Belgium with the headquarters in West Conshohocken.The AISI was formed initially in 1855 as the American Iron Association in the Eastern America. They were mostly focused on the pig iron production standards. The association renamed to become the American Iron and Steel Association (AISA) in 1864 and was head quartered in Philadelphia.

Later on in 1908, the AISI was formed and operated parallelly with the AISA for four year up to 1912. Then the AISA was merged into the AISI as one institution and was head quartered in New York.
However, the AISI is mostly focused on the North American side of the steel industry where the ASTM is an international organization and the standards are internationally recognized and used. The aim of the AISI is mostly to making the North American steel industry to have a respectable place in the world steel market, produce quality materials and to have better profits. The ASTM is an international organization that provides standards and specifications for the world of steel and other materials with standard developing partners in over 140 countries around the world.

The AISI is a business organization where the ASTM membership is voluntary. Due to the international recognition, most of the ASTM standards are also used in many of the federal agencies and regulations in the United States of America as well. The ASTM includes the terminology standard that provides a definition of terms that are agreed upon. It provides the standard classification which is a grouping of materials with similar characteristics to be put together according to product, service, system and material.

The standard guide is an information and options provider developed by the ASTM. The standard practice offered by the ASTM is the definition of a sequence of operation for any particular process. The standard test methods are to determine how the tests are made and how best the results of a test are. The standard specification set forth by the ASTM defines the requirement for any particular standard specification.


AISI & American standards Stainless Steel Pipes and Tubes
304 ASTM A312 TP304





X 5 CrNi 18 10

X 5 CrNi 18 12

23 32
304L ASTM A312 TP304L 304S11 1.4306 X 2 CrNi 18 11 23 52
310 ASTM A312 TP310 310S24 1.4845 X 12 CrNi 25 21  
316 ASTM A312 TP316 316S31 1.4401 X 5 CrNiMo 17 12 2 23 47
316L ASTM A312 TP316L 316S11 1.4404 X 2 CrNiMo 17 13 2 23 48
317L ASTM A312 TP317L 317S12 1.4438 X 2 CrNiMo 18 16 4 23 67
321 ASTM A312 TP321 321S31



X 6 CrNiTi 18 10

X 12 CrNiTi 18 9

23 37
347 ASTM A312 TP347 347S31 1.4550 X 6 CrNiNb 18 10 23 38