Known as ultra-low carbon stainless steel, grade 304L is widely used to make equipment and parts that require good overall performance (corrosion resistance and formability). 304L is a lower carbon variant of 304 stainless steel, suitable for applications requiring welding. The lower carbon content minimizes carbide precipitation in the heat affected zone around the welding sections, which in result eliminates intergranular corrosion (weld erosion) in certain environments.
|Grade||Chemical Component %|
Stainlesss Steel 304L Plates Equivalent Grades
|SS 304L||S30403||1.4306/1.4307||Z3CN18‐10||X2CrNi18-9 / X2CrNi19-11||SUS 304L||304S11||03Х18Н11|
|SS 304||S30400||1.4301||Z7CN18‐09||X5CrNi18-10||SUS 304L||304S31||08Х18Н10|
|Grade||Density (kg/m3)||Elastic Modulus (GPa)||Mean Coefficient of Thermal Expansion (m/m/0C)||Thermal Conductivity (W/m.K)||Specific Heat 0-1000C (J/kg.K)||Electrical Resistivity (n.m)|
|0-1000C||0-3150C||0-5380C||at 1000C||at 5000C|
|Grade||Tensile Strength (MPa) min||Yield Strength 0.2% Proof (MPa) min||Elongation (% in 50mm) min||Hardness|
|Rockwell B (HR B) max||Brinell (HB) max|
Corrosion Resistance Performance
The series have good performance in various environments of atmosphere or corrosive mediums. It could have pitting and crevice corrosion in chloride of certain temperature, and stress-corrosion cracking above 60℃. At room temperature it stands in high chloride content of 200mg/L without pitting, and at 60℃ when the chloride content reduced to about 150mg/L, the corrosion resistance of 304 and 304L are not different.
When it is applied to intermittent use below 870°C, and continuous use below 925°C, there remains good antioxidation. If the follow-up corrosion in aqueous solutions is important, it is not suggested to use 304 stainless steel continuously at 425-860°C. 304L stainless steel is resistant to carbide precipitation, which could be applied to this range of temperature.