Stainless steels which – beside the necessary percentage of Chromium – contain a good amount of Nickel and possibly of Molybdenum.
|304L||Chemical Composition - Maximum Value|
|Tensile Strength (MPa) min||Yield Strength 0.2% Proof (MPa) min||Elongation (% in 50mm) min||Hardness|
|Rockwell B (HR B) max||Brinell (HB) max|
AISI 304L steel is the same as AISI 304, however with less Carbon content, where the “L” in the name stands for “Low carbon”.
The lesser quantity of Carbon means this grade of stainless steel does not require annealing and therefore is widely used in very thick components (> 6 mm). The lesser quantity of Carbon minimises the precipitation of Chromium carbides produced in the welding phases and therefore susceptibility to intergranular corrosion. This characteristic makes 304L grade steel particularly suitable for welding even in very serious corrosive conditions. In general, the mechanical characteristics are comparable (in some cases slightly worse) to the corresponding AISI 304.
As AISI 304, AISI 304 L also presents magnetic characteristics and can be used in cryogenic environments and up to 700 degrees. Its main uses are heat exchangers, piping, pressurised tanks, valves and in general all applications requiring good sealing against atmospheric agents.