ASTM A312 TP304L EFW pipe
Type 304L is a variant of Type 304 with a low carbon content to improve weldability and reduce the risk of reduced corrosion resistance around the weld. The yield strength and tensile energy of Type 304L are also slightly reduced compared to Type 304.
These steel grades are the symbols of many of the most commonly used or have become standard stainless steel products. They may be an important part of 300 series steels (as described in SAE requirements) processing a range of austenitic chromium-nickel alloys. They are also known as 18/8 stainless steels because their elemental composition includes approximately 18% chromium and 8% nickel by weight. AISI 04 stainless steel and 304L stainless steel are general purpose stainless steels with good resistance to atmospheric corrosion, many organic and inorganic chemicals, and food and beverages. The difference between 304 and 304L stainless steel is that 304L has a maximum carbon content of 0.03, which is suitable for welding, while 304 has a moderate carbon content.