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At Gangsteel, a leading manufacturer and exporter of stainless steel products, we supply premium 304H stainless steel plates compliant with ASME SA 240 and ASTM A240 standards. 304H stainless steel, also known as AISI 304H, UNS S30409, or EN 1.4948, is a high-carbon austenitic stainless steel optimized for high-temperature strength and creep resistance. This guide details the maximum temperature service limits and performance of 304H stainless steel for applications like boilers, heat exchangers, and SA 240 GR 304 pipe. For inquiries, contact us at admin@gangsteel.com or explore our ASME SA240 Stainless sheet offerings.
The maximum temperature service limits for 304H stainless steel, as specified by ASME BPVC Section II, Part D and ASTM A240, are:
These limits are driven by the high carbon content (0.04-0.10%), which enhances creep and stress rupture strength compared to 304 (≤0.08% C) and 304L (≤0.03% C). For higher-temperature applications, explore sa240 gr 321 or sa240 gr 310s.
304H stainless steelexcels in high-temperature environments due to its enhanced creep and stress rupture properties:
For applications requiring chloride resistance, see sa240 gr 317l.
The chemical composition of 304H stainless steel supports its high-temperature capabilities:
Element |
Range (%) |
Role in High-Temperature Performance |
---|---|---|
Carbon (C) |
0.04 - 0.10 |
Enhances creep and stress rupture strength at high temperatures. |
Chromium (Cr) |
18.00 - 20.00 |
Forms a passive oxide layer, resisting scaling up to 1200°F. |
Nickel (Ni) |
8.00 - 10.50 |
Stabilizes austenitic structure (SA 240 304 non magnetic), aiding thermal stability. |
Manganese (Mn) |
0.00 - 2.00 |
Supports structural integrity at high temperatures. |
Silicon (Si) |
0.00 - 0.75 |
Enhances scaling resistance at elevated temperatures. |
Phosphorus (P) |
0.00 - 0.045 |
Controlled to avoid embrittlement at high temperatures. |
Sulfur (S) |
0.00 - 0.030 |
Limited to maintain weld quality and thermal stability. |
Nitrogen (N) |
0.00 - 0.10 |
Strengthens alloy; supports creep resistance. |
Iron (Fe) |
Balance |
Base metal; ensures structural stability up to 1500°F. |
Higher carbon content compared to 304 (≤0.08%) and 304L (≤0.03%) is key to 304H’s high-temperature performance. For comparison, see sa240 gr 304.
The mechanical properties of 304H stainless steel for annealed plates (8-75 mm thick) complement its temperature limits:
Property |
Value (Minimum) |
Notes |
---|---|---|
Tensile Strength |
515 MPa (75 ksi) |
Maintains strength at high temperatures |
Yield Strength (0.2% Offset) |
205 MPa (30 ksi) |
Stronger than 304L (170 MPa) |
Elongation (A5, 50 mm) |
40% |
High ductility for forming |
Hardness (Brinell) |
≤ 201 HB |
Supports machinability |
Hardness (Rockwell B) |
≤ 92 HRB |
Comparable to 304 |
These properties, combined with fine grain size (ASTM 5-8), ensure creep resistance and structural integrity at 1500°F, ideal for applications like plat SS 304 3mm.
These properties support performance at high temperatures, unlike ferritic grades like sa240 gr 430.
304H stainless steeloffers excellent corrosion resistance in:
Higher carbon (0.04-0.10%) increases sensitization risk in weld zones (797°F-1580°F), requiring annealing. For chloride-heavy environments, see sa240 gr 316ln.
Weldability is fair using ER308H fillers. Higher carbon risks sensitization, necessitating low heat input (<2.0 kJ/mm) or post-weld annealing (1870-2100°F). For better weldability, see sa240 gr 304l.
304H stainless steelis used in:
For cost-effective alternatives, see sa240 gr 201.
As of October 19, 2025, 304H stainless steel plate prices (2B finish, 3-6mm) range from $1.60-$3.50/kg. Gangsteel offers $1.60/kg FOB (MOQ 1 ton) for sa240 gr 304h. Contact admin@gangsteel.com or visit astm a 240 stainless plate.
Up to 1500°F (815°C), where it maintains creep resistance and structural integrity, ideal for boilers and heat exchangers.
Up to 1600°F (871°C) for short-term exposure, suitable for cyclic operations like startup/shutdown in power plants.
304H supports 1500°F continuous service with 25.5 ksi allowable stress at 1000°F, while 304L is limited to ~800°F with 14.9 ksi, due to 304H’s higher carbon content.
Higher carbon (0.04-0.10%) and fine grain size (ASTM 5-8) enhance creep resistance, ensuring durability up to 1500°F in pressure vessels.
Boilers, heat exchangers, superheaters, and SA 240 GR 304 pipe leverage 304H’s high-temperature strength for reliable performance.
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