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At Gangsteel, a trusted supplier of stainless steel, we provide high-quality SA 240 GR 304H and SA 240 GR 321 plates compliant with ASME SA 240 and ASTM A240 standards.
304H stainless steel(UNS S30409, AISI 304H, EN 1.4948) is a high-carbon austenitic grade designed for high-temperature strength up to 1500°F (815°C).
321 stainless steel(UNS S32100, AISI 321, EN 1.4541) is a titanium-stabilized austenitic grade for enhanced weldability and high-temperature performance.
Both are non-magnetic with a density of 8.00 g/cm³. This guide compares 304H vs 321 stainless steel, focusing on high-temperature performance, stabilization, and applications like plat stainless 304 and SA 240 GR 304 pipe. Contact us at admin@gangsteel.com or explore our ASME SA240 Stainless sheet.
304Huses high carbon for creep resistance in high-heat environments like boilers.
321employs titanium stabilization to prevent sensitization, improving weldability at high temperatures.
Both excel in high-temperature applications, but 321 is better for welded components.
Titanium in 321 and carbon content in 304H drive performance differences.
|
Element |
304H (%) |
321 (%) |
Role |
|---|---|---|---|
|
Carbon (C) |
0.04 - 0.10 |
0.00 - 0.08 |
304H’s high carbon boosts creep strength; 321’s lower carbon aids weldability. |
|
Chromium (Cr) |
18.00 - 20.00 |
17.00 - 19.00 |
Both resist corrosion via oxide layer. |
|
Nickel (Ni) |
8.00 - 10.50 |
9.00 - 12.00 |
Higher Ni in 321 enhances toughness. |
|
Titanium (Ti) |
- |
5xC - 0.70 |
321’s Ti prevents sensitization. |
|
Iron (Fe) |
Balance |
Balance |
Base metal for structure. |
Titaniumin 321 binds carbon, preventing chromium carbide formation. Carbon in 304H enhances high-temperature strength. See sa240 gr 304h and sa240 gr 321.
304H:
321:
Performance: 304H excels in non-welded high-heat; 321 is superior for welded high-temperature components. See sa240 gr 321h.
304H: Resists mild acids and atmospheric conditions, outperforming SS204 vs SS 304.
321: Similar resistance but better in welded applications due to titanium stabilization.
Titanium Benefit: 321 maintains corrosion resistance in welds at high temperatures. See sa240 gr 316l.
|
Property |
304H (Min) |
321 (Min) |
Notes |
|---|---|---|---|
|
Tensile Strength (MPa) |
515 |
515 |
Equal at room temperature. |
|
Yield Strength (MPa) |
205 |
205 |
Both resist deformation well. |
|
Elongation (%) |
40 |
40 |
Highly formable for plat SS 304 3mm. |
|
Hardness (Brinell) |
≤ 201 HB |
≤ 217 HB |
321 slightly harder due to Ti. |
Both offer similar strength, but 321’s stabilization enhances weld performance at high temperatures. See sa240 gr 304.
304H: Fair with ER308H fillers; higher carbon risks sensitization, needing annealing.
321: Excellent with ER347 fillers; titanium prevents sensitization.
For welds, see sa240 gr 321.
304H: Boilers, heat exchangers, power generation (non-welded).
321: Welded high-temperature components, aerospace, chemical processing.
For cost-effective options, see sa240 gr 201.
As of October 19, 2025:
Gangsteel offers $1.60/kg for 304H, $2.00/kg for 321 FOB (MOQ 1 ton). Visit astm a 240 stainless plate.
304His cost-effective for high-temperature, non-welded applications, leveraging high carbon for strength. 321’s titanium stabilization enhances weldability and corrosion resistance for high-temperature welded components. Choose 304H for heat, 321 for welds.
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