What is the Difference between 204 and 304 Stainless Steel
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What is the Difference between 204 and 304 Stainless Steel
Both SS 204 and SS 304 are austenitic stainless steels, but their compositions, properties, and applications differ. SS 304 is a 300 series alloy with a high nickel content, offering excellent corrosion resistance; while SS 204 is a 200 series alloy with a low nickel content, high manganese content, and lower cost. Understanding these differences is crucial for selecting the right material. Gnee Steel Group, a leading Chinese manufacturer and exporter, supplies both grades of stainless steel conforming to the ASME SA240 standard. As an expert in ASME SA240 stainless steel sheets, Gnee Steel provides customized solutions to customers worldwide. This guide compares SS 204 and SS 304, including the density of SS 304 sheet, SA-240 304L material, and other key aspects.
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What are the disadvantages of 304 stainless steel?
304 stainless steel does have one disadvantage-it is susceptible to corrosion from chloride solutions or saline environments (such as near the sea). Chloride ions can form corrosion points in localized areas, called "pitting corrosion," which can spread beneath the chromium protective layer, thus damaging the internal structure.
What is SS 204 stainless steel?
SS 204 is a 200 series austenitic stainless steel with a lower nickel content (1-3%) and a higher manganese content (5-7%), resulting in a lower price but slightly lower corrosion resistance. It is equivalent to UNS S20400 and is suitable for interior applications such as furniture. Gnee Steel's SS 204 meets the standards for SS 240 and SS 304 alternatives, and its non-magnetic properties are similar to SS 304.
What is SS 304 stainless steel?
SS 304 is a 300 series austenitic stainless steel with a higher nickel content (8-10.5%), exhibiting excellent corrosion resistance and ductility. It is equivalent to UNS S30400 and EN 1.4301 and is suitable for corrosive environments. Gnee Steel's SA240 Gr 304 is ideal for the SA 240 type 304 304L variant, and the SA 240 304L material meets low carbon requirements.
Chemical Composition Comparison
The table below shows the compositions:
|
Element |
SS 204 (%) |
SS 304 (%) |
Impact |
|---|---|---|---|
|
Chromium (Cr) |
16-18 |
18-20 |
Similar, but 304 has more for better resistance. |
|
Nickel (Ni) |
1-3 |
8-10.5 |
Higher in 304 for superior corrosion; 204 uses Mn (5-7%) instead. |
|
Manganese (Mn) |
5-7 |
≤2 |
Higher in 204 for austenite stability, increasing hardness. |
|
Carbon (C) |
≤0.15 |
≤0.08 |
Lower in 304 to avoid sensitization. |
For sa 240 304 material and material sa 240 304, 304's composition ensures better durability.
Mechanical Properties Comparison
SS 204 is harder, while SS 304 is more ductile.
|
Property |
SS 204 |
SS 304 |
Notes |
|---|---|---|---|
|
Tensile Strength |
620 MPa |
515 MPa (min) |
204 is stronger. |
|
Yield Strength |
310 MPa |
205 MPa (min) |
204 has higher yield. |
|
Elongation |
40% |
40% |
Similar. |
|
Hardness (Brinell) |
201 max |
201 max |
204 often harder. |
|
Density |
7.8 g/cm³ |
7.93 g/cm³ |
Similar ss 304 plate density and sa 240 304l density. |
Corrosion Resistance: SS 204 vs 304
Due to its higher nickel content, 304 stainless steel has better corrosion resistance and is more suitable for outdoor or humid environments. 204 stainless steel is prone to rusting in humid environments and is more suitable for indoor use.
Weldability and Formability
Both can be welded, but SS 304 is better suited for complex welds. Their formability is similar, but SS 304 has better ductility.
Price Comparison
Due to its lower nickel content, SS 204 is priced at $1200-$1800 per tonne, which is 20-30% cheaper than SS 304 ($1820-$3584 per tonne). Gnee Steel offers highly competitive prices for 304 stainless steel sheets, plates, thin sheets, and thick plates.
Applications of SS 204 and SS 304
The table below highlights applications:
|
Industry |
SS 204 Applications |
SS 304 Applications |
Related Products |
|---|---|---|---|
|
Chemical |
Mild tanks |
Corrosive reactors |
SA240 Gr 317L |
|
Food |
Indoor equipment |
Processing vessels |
SA240 Gr 316L |
|
Construction |
Indoor panels |
Outdoor structures |
SA240 Gr 321 |
|
Automotive |
Interior trims |
Exhaust systems |
SA240 Gr 409 |
Gnee Steel's ASME SA 213/SA 213M stainless pipes complement both.
Comparing SS 204 and SS 304 with Other Grades
204/304 Stainless Steel vs. 430 Stainless Steel: 304 stainless steel offers better corrosion resistance, while 430 stainless steel is magnetic and less expensive.
204/304 Stainless Steel vs. 316 Stainless Steel: 304 stainless steel has a wide range of applications, while 316 stainless steel is suitable for chloride environments.
Gnee Steel offers a variety of advanced options in its stainless steel selection.
Why Choose Gangsteel for SS 204 and SS 304?
Gnee Steel offers the following products and services:
Quality Assurance: Meets ASME SA240 and ASTM A240 standards.
Customization Services: Available in various sizes and finishes.
Global Shipping: Worldwide shipping.
Product Range: Includes SA240 Gr 347 and SA240 Gr 201L.
