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.

Standard: ASTM, JIS, AISI, GB, DIN, EN


Grade Chemical Component %
C Cr Ni Mn P S Mo Si Cu N Other
304 0Cr18Ni9 ≤0.07 17.00-19.00 8.00-10.00 ≤2.00 ≤0.035 ≤0.030 - ≤1.00 - - -
304L 00Cr19Ni10 ≤0.030 18.00-20.00 8.00-10.00 ≤2.00 ≤0.035 ≤0.030 - ≤1.00 - - -

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

Physical properties

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
304L 8000 193 17.2 17.8 18.4 16.2 21.5 500 720
304 8000 193 17.2 17.8 18.4 16.2 21.5 500 720

Mechanical properties

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
304L 485 170 40 92 201
304L 515 205 40 92 201

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.

Heat Resistance

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.

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