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SS204 and SS304 are both austenitic stainless steels, but they differ significantly in composition, performance, and cost, making the choice between them critical for applications in construction, automotive, and food processing. SS304, the industry standard with higher nickel content, offers superior corrosion resistance, while SS204, a cost-optimized alternative with manganese substitution, provides acceptable performance for less demanding environments. Gangsteel, a premier manufacturer and exporter in China, supplies both grades under ASME SA240 stainless steel plates standards, ensuring compliance for global projects. This guide compares SS204 and SS304 based on real-world data, helping buyers make informed decisions.
SS204 is a low-nickel austenitic stainless steel, often used as a budget alternative to SS304. It contains about 2% nickel, compensated by higher manganese (around 5-7%) to maintain austenitic structure. This makes it harder and more cost-effective but less resistant to corrosion. Equivalent to AISI 204 or UNS S20400, it's suitable for indoor or mildly corrosive settings.
SS304 is the most widely used austenitic stainless steel, with 8% nickel and 18% chromium for excellent corrosion resistance and formability. Known as AISI 304 or UNS S30400, it's non-magnetic and highly weldable, ideal for harsh environments. Gangsteel's SA240 Gr 304 meets ASTM A240 stainless plate specs.
The table below shows key differences in composition:
|
Element |
SS204 (%) |
SS304 (%) |
Impact |
|---|---|---|---|
|
Chromium (Cr) |
16-18 |
18-20 |
Similar corrosion base, but SS304 edges in oxidizing environments. |
|
Nickel (Ni) |
1-3 |
8-10.5 |
SS304's higher Ni improves ductility and resistance; SS204 uses Mn (5-7%) substitute, reducing cost but corrosion resistance. |
|
Manganese (Mn) |
5-7 |
≤2 |
Higher in SS204 for austenite stability, making it harder. |
|
Carbon (C) |
≤0.03 |
≤0.08 |
Both low, but SS304 can be higher for strength. |
SS204 is harder due to manganese, while SS304 is more ductile:
|
Property |
SS204 |
SS304 |
Notes |
|---|---|---|---|
|
Tensile Strength |
620 MPa (typical) |
515 MPa (min) |
SS204 has higher annealed strength but lower work hardening rate. |
|
Yield Strength |
310 MPa |
205 MPa |
SS204 stronger but less formable. |
|
Elongation |
40% |
40% |
Similar ductility. |
|
Hardness (Brinell) |
201 (max) |
201 (max) |
SS204 often harder in practice. |
|
Density |
7.8 g/cm³ |
7.93 g/cm³ |
Comparable. |
SS304 outperforms SS204 in corrosion resistance due to higher nickel and chromium. SS204 offers moderate resistance but rusts easier in humid or chloride environments. SS304 is preferred for outdoor or wet applications, while SS204 suits indoor, dry settings.
SS304 is easier to weld with better results, while SS204 is weldable but less so due to composition. Both have good formability, but SS304's ductility makes it superior for complex shapes.
SS204 is cheaper (20-30% less) due to low nickel; SS304 averages $1,820-$3,584/MT, SS204 $1,200-$1,800/MT. Gangsteel's pricing for SS304 is $1,820/MT FOB China.
SS304 for corrosive environments (e.g., marine, food); SS204 for cost-sensitive indoor uses (e.g., furniture, appliances). Gangsteel's SA240 Gr 304L enhances weldability.
Gangsteel offers both grades under ASME SA240 stainless steel plates, with custom sizes and competitive pricing. Contact for quotes on ASTM A240 stainless plate.
SS204 is a budget option with moderate performance, while SS304 excels in corrosion resistance and weldability. For reliable supply, Gangsteel provides high-quality options like SA240 Gr 316L. Contact for UNS stainless steel plates.
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