SUS329J4L Stainless Steel: Properties, Strength, and Corrosion Resistance
Last updated : 2025/11/6
SUS329J4L is a duplex stainless steel that combines both austenitic and ferritic phases, providing excellent strength and corrosion resistance. With high chromium and molybdenum content, it offers strong resistance to carbon dioxide and chloride environments, protecting against pitting and crevice corrosion.
Key Properties of SUS329J4L
Among stainless steels, SUS329J4L offers excellent corrosion resistance, particularly against chloride environments and crevice corrosion.
SUS329J4L has greater corrosion resistance than SUS316, making it suitable for applications requiring higher performance.
SUS329J4L has higher strength than SUS304, but it is also more difficult to machine.
Its high-temperature strength is lower than SUS304, and deformation may occur under extremely high temperatures.
Welding can be performed using similar methods to SUS304.
SUS329J4L is a magnetic stainless steel.
Typical Composition of SUS329J4L
C | Si | Mn | P | Ni | S | Cr | Mo | N | |
|---|---|---|---|---|---|---|---|---|---|
Content (%) | ~0.03 | ~1.0 | ~1.5 | ~0.04 | 5.50~7.5 | ~0.03 | 24.00~26.0 | 2.50~3.5 | 0.08~0.3 |
Mechanical Properties of SUS329J4L
Yield Strength N/mm^2 | Tensile Strength N/mm^2 | Elongation % | Reduction of Area % | Hardness HBW | Hardness HRC | Hardness HV |
|---|---|---|---|---|---|---|
≥390 | ≥590 | ≥18 | ≥40 | ≤392 | ≤32 | ≤320 |
Key Points
SUS329J4L is a type of duplex stainless steel, and with its high chromium and molybdenum content, it offers excellent strength and outstanding corrosion resistance, particularly in chloride environments and against crevice corrosion.
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