What is the difference between ASME and ASTM?

Nov. 21, 2022

The standard issue of malleable pipe fittings is an important and serious issue. The determination of relevant standards is actually a very convenient communication tool because various issues about product parameters and quality that are often involved in the process of communication between buyers and sellers can be answered smoothly through whether a certain product meets a certain standard. Therefore, both buyers and sellers need to be quite familiar with the standards of related products, so that buyers and sellers can communicate more efficiently and achieve satisfactory results for both parties.


In the field of malleable pipe fittings, American ASME and ASTM standards have a very important position. Especially the malleable pipe fittings to be imported to the United States must meet these standards, and even some South American countries and Middle Eastern countries will require malleable pipe fitting threads that meet these American standards. Below we will introduce in detail what ASME and ASTM standards are, what are the similarities and differences between them, and which malleable pipe fittings produced by Jianzhi Group meet these standards.


Table of contents


● What is the ASME


● What is ASTM


● What are the similarities and differences between ASME and ASTM


● Whether the malleable pipe fittings of Jianzhi Group meet ASME or ASTM standards


1. What is the ASME standard


ASME is the English abbreviation of the American Society of Mechanical Engineers. Founded in 1880, the American Society of Mechanical Engineers has branches all over the world. It is an international academic organization with great authority and influence.

ASME is mainly engaged in the development of science and technology in mechanical engineering and related fields, encouraging basic research, promoting academic exchanges, developing cooperation with other engineering and associations, carrying out standardization activities, and formulating mechanical specifications and standards. It has 125,000 members, manages the world's largest technical publishing agency, hosts 30 technical conferences per year, 200 professional development courses, and develops many industry and manufacturing standards.

Since its inception, ASME has led the development of mechanical standards and has developed more than 600 standards from the original thread standard to the present. In 1911, the Boiler Machinery Directive Committee was established, and the Machinery Directive was promulgated from 1914 to 1915. Later, the directive was combined with the laws of various states and Canada.

ASME has become a worldwide engineering institution primarily in the fields of technology, education, and survey. In addition, ASME is one of the five sponsors of ANSI. ANSI's mechanical standards are mainly proposed by it, and represent the technical advisory group of the American National Standards Committee to participate in ISO activities.


ASME standard thread 

ASME standard thread



2. What is ASTM


The predecessor of ASTM was the International Association for Testing Materials (IATM). The first meeting of IATM was held in Europe in 1882. At that time, it mainly studied and solved the problem of test methods for steel and other materials. At the same time, the International Association for Testing and Materials also encourages national organizations to organize chapters.

Subsequently, on June 16, 1898, 70 IATM members gathered in Philadelphia, USA to hold a meeting to establish the American Branch of the International Association for Testing and Materials. In 1902, at the fifth annual meeting of the International Society for Testing Materials, the American branch was declared to be officially independent and named the American Society for Testing Materials.

With the continuous expansion and development of its business scope, the work center of the Society is not only to research and formulate material specifications and test method standards, but also to include the characteristics and performance standards of various materials, products, systems, service items, and test methods, procedures and other standards. In 1961, the organization changed its name to the American Society for Testing and Materials (ASTM), which is still in use today.

3. What are the similarities and differences between ASME and ASTM


● ASME materials are recognized by the Boiler and Pressure Vessel Association for use in pressure equipment, while ASTM materials are not recognized.

● Materials in ASME standards start with SA, while those in ASTM standards start with A.

● Whether it is equivalent to ASTM is clearly stated on the ASME standard. In addition, ASME has more material inspection items than ASTM. After all, ASME materials are used for pressure equipment.

● ASTM materials become ASME materials after being approved by ASME for pressure-bearing equipment, and most of the ASME material standards refer to ASTM.


4. Whether the malleable pipe fittings of Jianzhi Group meet ASME or ASTM standards

As far as the threads of malleable pipe fittings are concerned, ASTM and ASME are the same and can be collectively referred to as American standard threads, abbreviated as NPT (abbreviation for National (American) Pipe Thread). NPT is a 60degree tapered pipe thread.

In the field of malleable pipe fittings, American standards are divided into two types: class150 and class300. The working pressure of class300 is 4-5 times higher than that of class150 under the same working pressure, so the use environment and conditions are completely different. Class300 fittings are thicker and heavier than class150 fittings.

The malleable pipe fittings currently produced by Jianzhi Group are not purely American standard, because American standard malleable pipe fittings are too heavy to be welcomed by many countries and regions in the world, and of course, they are not economical. However, due to the influence of historical factors, many countries and regions in the world generally use the thread of the American National Standard. Therefore, according to the market demand, Jianzhi Group creatively launched a series of malleable pipe fittings that meet the American standard thread, are lighter in weight, and are more economical. Although the weight is slightly lighter than the American standard, it fully complies with the British standard in terms of relevant technical parameters, ensuring the safety of the pipeline system.

Jianzhi brand malleable pipe fittings 

Jianzhi brand malleable pipe fittings


It is precise because of this unique combination that the pipe fittings of Jianzhi Group are widely favored all over the world. Our colleagues in the United States can provide you with more competitive prices. I hope to get your inquiry. Of course, you can also click the link below to enter the official YouTube homepage of Jianzhi Group and have a more intuitive understanding of the malleable pipe fittings products of Jianzhi Group.


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