904L stainless steel combines molybdenum, copper, and iron for greatly improved resistance to reducing acids such as sulfuric acid. It has excellent resistance to chlorides in the environment, resulting in low pitting and crevice corrosion and stress corrosion cracking.

We can machine this steel to suit your application using our in-house machining capabilities and services on your schedule.

The "L" in 904L stands for low carbon, specifically, 0.03% or less carbon added to the alloy. This means that 904L has very good welding properties. It is also an austenitic alloy, which means that iron carbide, or a non-magnetic solid solution of carbon in iron, is used to increase corrosion resistance.

Properties and uses of 904L stainless steel
904L cannot be hardened by heat treatment. You can weld 904L stainless steel using any standard method, but it is prone to hot cracking. It can be processed but not processed well.

Common applications take advantage of the corrosion resistance of 904L. These include acid processing plants, pulp and paper operations, equipment for cooling seawater, oil refining and environmental protection equipment.

The chemical processing industry uses 904L stainless steel extensively because of its broad corrosion resistance.