ELC Extra Low Carbon Stabilized Molybdenum Grades

ELC – Extra Low Carbon – Grades (304L, 308L)

The 0.04% maximum carbon content of ELC grades helps eliminate damaging carbide precipitation caused by welding. These grades are most often used for weldments which operate in severe corrosive conditions at temperatures under 800°F (427°C).

ELC steels are generally welded with the ELC electrode, AWS E308L-XX. Although the stabilized electrodes AWS E347-XX produce welds of equal resistance to carbide precipitation and similar mechanical properties, the ELC electrode welds tend to be less crack sensitive on heavy sections and have better low temperature notch toughness.

The low carbon content in ELC grades leaves more chromium to provide resistance to intergranular corrosion.

Stabilized Grades (321, 347, 348)

Stabilized grades contain small amounts of titanium (321), niobium (columbium) (347), or a combination of niobium and tantalum (347, 348). These elements have a stronger affinity for carbon then does chromium, so they combine with the carbon leaving the chromium to provide corrosion resistance.

These grades are most often used in severe corrosive conditions when service temperatures reach the sensitizing range. They are welded with the niobium stabilized electrodes, AWS E347-XX.

Type 321 electrodes are not generally made because titanium is lost in the arc. AWS E347-XX is usually quite satisfactory for joining type 321 base metal.

Molybdenum Grades (316, 316L, 317, 317L, D319)

Molybdenum in stainless steel increases the localized corrosion resistance to many chemicals. These steels are particularly effective in combatting pitting corrosion. Their most frequent use is in industrial

Directory | Standard | Heat | Heat Exchanger | Temperature | Pressure | Corrosion | Hardness | Surface | Properties | Select Stainless Steel | Contact US