Since the SS 304 welded pipe is an economically viable option, they are more often used in heat exchangers. While heat exchangers require moderate resistance to corrosion and good tensile strength as primary properties, the very versatile SS 304 efw pipe is able to cater to their needs without causing a dent in the buyer’s pocket. Moreover, the Stainless Steel 304 erw pipe performs the functions rather effectively.
Therefore, the ASTM A312 tp 304 seamless pipe is a popular choice across various industrial sectors such as power stations, chemical plants, refrigeration, air conditioning, petrochemical plants as well as petroleum refineries. The ASTM A312 specified aisi 304 pipe have been designed keeping in mind their use for applications that not only involve high temperature conditions but also for general corrosive applications.
Cold working the ASME SA312 grade 304 pipe is usually performed in order to permanently change the crystalline structure of the alloy by application of mechanical strength. This in turn is what causes an increase in the tensile strength properties of the SS 304 seamless pipe, that too without the use of heat.
Manufacturers produce SS 304 seamless pipe by extruding billet to specific length and welded pipe by jointing and welding the seam of Strip or coil. The cost of seamless pipe is 20% higher than a welded pipe no matter it is ERW or EFW. For drilling smls pipe is always better.
Chemical Material Composition of Astm a312 tp 304 seamless pipes
Yield Strength of asme sa312 grade 304 pipes
Elongation (% in 50mm) minimum
Strength of Yield 0.2% Proof (MPa) minimum
Strength of Tensile (MPa) minimum
Rockwell B (HR B) maximum
Brinell (HB) maximum
Equivalent material of stainless steel 304 erw pipes
Is Stainless steel 304 seamless pipe is suitable for the exhaust line?
The stainless steel 304 is a chromium nickel alloy that has 18% chromium and 8% nickel in its composition. The material has some extent of general corrosion resistance and has good strength. The operating temperature range can be up to 899 degrees Celsius without scaling for continuous operation. The exhaust lines work under temperatures ranging from 300 degrees Celsius to 1200 degrees. Although it seems like the 304 material can be used for some of the exhaust pipes, the major problem is the oxidation of the pipes at a high temperature. The 304 pipes are not oxidation resistant and can immediately be oxidized under high temperatures. So the 304 seamless pipes can be used for exhaust pipes but oxidation is expected.