What is ASTM?
ASTM (American Society for Testing and Materials) is an organization that sets standards for many sectors. By providing a framework for the production methods, chemical and physical properties of the products, these standards helps manufacturers, sellers, buyers, developers and users to describe all the properties of the product they want in one or a few words. Standards make all stages more transparent from production to assembly.
ASTM Standards Stainless Pipe
As with standards mentioned above, many standards have been developed under the main heading for stainless pipes. It is detailed according to the production method of the pipe, usage area, chemical and physical factors.
In general, stainless steel pipes are preferred in environments where there is corrosion and in pressure systems. However, in the details of the stainless pipe subhead;
- Annealed (Heat Treated)
- Unannealed (Untreated)
- Cold Drawing
- Hot Drawing
- According to Raw Material Type
- Austenitic Stainless Steel
- Ferritic Stainless Steel
- Martenitic Stainless Steel
- Duplex Stainless Steel
- Precipitation Hardened Stainless Steel
Seamless Tube Production
ASTM-A269 Stainless Pipes Overview
Pipes according to ASTM-A269 standards are corrosion- resistant and they are welded and seamless austenitic steel stainless pipes which are suitable for general use. Therefore, ASTM-A269 stainless pipes are generally used in hydraulic systems. It is preferred in low and high temperatures and high pressure producing systems. It is produced from AISI 304 or AISI 316 quality stainless steel with or without stitching. Since AISI 316 stainless steel contains more molybdenum (Mo) and nickel (Ni) elements than AISI 304 quality stainless steel, it is more useful in environments that require acidic, salty and high temperature resistance.
The recommended pipe standard for hydraulic fittings according to DIN 2353 is ASTM-A269. In hydraulic systems, the operating and bursting pressure of the installation is determined by the circuit element with the weakest resistance to pressure in the hydraulic installation. All products in DIN-2353 norm are produced from filled rods or forged raw materials. Therefore, their compressive strengths of course have a working pressure of at least 250 Bar depending on the product to be used and its quality.
Some ASTM Standards and Features
ASTM A213: Pipes used in production of seamless (drawn) heat treated boiler, heat exchanger and super heater.
ASTM A249: Stainless steel pipes manufactured for use in the production of welded heat treated heat exchangers.
ASTM A269: Seamy (welded) or seamless (drawn) heat treated pipes for general purpose.
ASTM A270: Seamy (welded) or seamless (drawn) heat treated steainless steel pipes for use in sanitary applications (food – cosmetics – special production pharmaceutical).
ASTM A358: Stainless steel pipes produced with EFW (Electric Fusion Welding). During the manufacture of these pipes, each pipe passes the radiography test (X-Ray Control). In this welding, both sides of the sheet metal are heated to melting point by means of electrical resistance and welding process is completed with the help of welding filler without applying any pressure.
ASTM A554: Stainless steel pipes used in welded construction. The definition of “Ornamental Pipes” has been made due to their use for decorative purposes. It is mainly HF welded low cost pipes and is definitely not recommended for use in processes.
ASTM A778: Welded and unheat-treated (non-annealed) stainless steel pipes.
ASTM A789: Seamy or seamless ferritic/austenitic (duplex) stainless steel pipe standard.
ASTM A790: Seamy or seamless ferritic/austenitic structure (duplex feature) is the standard of stainless steel pipes.