An acid-resistant, low-carbon alloy grade is SS 904L pipes. These 904L Grade 1.4539 Stainless Steel Pipes are noted for having a greater content of both nickel and molybdenum in addition to having a lower carbon content in their alloy. Characteristically, the Stainless Steel 904L Pipes exhibit traits like as excellent resistance to corrosion and good activation passivation conversion ability. In fact, the stainless steel 904L pipes’ ability to resist corrosion is particularly noticeable in non-oxidizing acids including acetic acid, sulfuric acid, formic acid, and phosphoric acid at any concentration, under normal pressure, and at any temperature.
Stainless Steel Grade 1.4539 Seamless Pipes have exceptional pitting resistance when utilized in neutral chloride-containing environments. In addition to being resistant to stress-related corrosion cracking and crevice corrosion, Stainless Steel 904L Pipes is also well suited for usage in sulfuric acid solution at varied concentrations below 70 °C. Since ASTM A312 uns n08904 1.4539 pipes have a low carbon content, they are not susceptible to carbide precipitation, even after general heat treatment or welding operations have been performed on the pipes. Intergranular corrosion, which can happen after either general heat treatment or welding procedures, is thereby eliminated.
The specified grade SA 312 uns n08904 Electro polished Pipes can be passivated even in settings containing reducing acids, such as sulfuric acid and formic acid, due to the increased amounts of all three elements, chromium, nickel, and molybdenum, as well as the inclusion of copper.
Due to its high nickel content, seamless stainless steel 904L is extremely resistant to stress-related corrosion cracking in environments with hydrogen sulphide, chloride, and concentrated hydroxide solutions.