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SS204 and SS304 are both austenitic stainless steels, but they belong to different series and serve distinct purposes. SS304, a 300-series alloy, is the most widely used stainless steel for its excellent corrosion resistance and versatility. SS204, from the 200-series, is a cost-effective alternative with higher manganese and lower nickel, making it suitable for less demanding environments. Gangsteel, a leading manufacturer and exporter in China, supplies both grades under standards like ASME SA240. As specialists in ASME SA240 stainless steel plates, Gangsteel offers customized solutions for global clients. This comparison highlights the differences to help choose the right material.
The primary difference lies in nickel and manganese content. SS304 has higher nickel for better corrosion resistance, while SS204 substitutes manganese for nickel to reduce costs. The table below shows the compositions:
|
Element |
SS204 (%) |
SS304 (%) |
Impact |
|---|---|---|---|
|
Chromium (Cr) |
16-18 |
18-20 |
Similar base for corrosion, but SS304 has slightly more for enhanced protection. |
|
Nickel (Ni) |
1-3 |
8-10.5 |
SS304's higher Ni improves ductility and resistance; SS204's low Ni makes it cheaper but less corrosion-resistant. |
|
Manganese (Mn) |
5-7 |
≤2 |
Higher in SS204 for austenite stability, increasing hardness but reducing corrosion performance. |
|
Carbon (C) |
≤0.15 |
≤0.08 |
Higher in SS204, potentially leading to more sensitization. |
|
Silicon (Si) |
≤1 |
≤0.75 |
Minor difference; both aid oxidation resistance. |
Gangsteel’s SS304 meets ASTM A240 stainless plate standards, while SS204 is often used for non-critical applications.
SS204 is harder due to manganese, but SS304 is more ductile and easier to form. The table below compares typical values:
|
Property |
SS204 |
SS304 |
Notes |
|---|---|---|---|
|
Tensile Strength |
620 MPa |
515 MPa (min) |
SS204 is stronger in annealed state but less formable. |
|
Yield Strength |
310 MPa |
205 MPa (min) |
SS204 has higher yield but can be brittle. |
|
Elongation |
40% |
40% |
Similar ductility. |
|
Hardness (Brinell) |
201 (max) |
201 (max) |
SS204 often feels harder in practice. |
|
Density |
7.8 g/cm³ |
7.93 g/cm³ |
Comparable. |
For high-strength needs, Gangsteel recommends SS304 over SS204.
SS304 significantly outperforms SS204 in corrosion resistance due to higher nickel, making it suitable for outdoor or humid environments. SS204 rusts more easily and is best for indoor use. In salt spray tests, SS304 lasts longer, while SS204 is prone to red rust. Gangsteel’s SS304 is ideal for marine applications, unlike SS204.
Both are weldable, but SS304 is better for complex welds due to lower manganese, which can cause cracking in SS204. Formability is similar, but SS304 is more ductile.
SS204 is 20-30% cheaper than SS304 due to low nickel ($1,200-$1,800/MT vs $1,820-$3,584/MT), but SS304's longevity often justifies the cost. Gangsteel offers both at competitive rates.
SS304 for corrosive or outdoor use (e.g., chemical tanks, marine fittings); SS204 for indoor, non-corrosive (e.g., furniture, utensils). Gangsteel’s SA240 Gr 304L enhances weldability for advanced needs.
Gangsteel provides both grades under ASME SA240 stainless steel plates, with custom sizes and certifications. Contact for quotes on JIS G 4304 stainless steel plate.
SS204 is a budget option with moderate performance, while SS304 excels in corrosion resistance and durability. For quality supply, Gangsteel offers solutions like SA240 Gr 316L. Contact for UNS stainless steel plates.
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