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At Gangsteel, a leading manufacturer and exporter of stainless steel products, we supply high-quality SA 240 Type 304H stainless steel plates compliant with ASME SA 240 and ASTM A240 standards. SA 240 Type 304H welding rod, used for joining this high-carbon austenitic grade (UNS S30409, AISI 304H, EN 1.4948), must match its composition to maintain high-temperature strength up to 1500°F (815°C). This guide covers recommended filler metals, best practices, and precautions for welding SA 240 Type 304H stainless steel in applications like boilers and heat exchangers. For inquiries, contact us at admin@gangsteel.com or explore our ASME SA240 Stainless sheet offerings.
The filler metal for SA 240 Type 304H welding rod should match the base metal’s high-carbon content to ensure creep resistance and corrosion stability. Common recommendations include:
Filler Type |
AWS Classification |
Key Composition |
Applications |
---|---|---|---|
ER308H |
AWS A5.9 ER308H |
High C (0.04-0.08%), 19-21% Cr, 9-11% Ni |
TIG/MIG for high-temperature welds; matches carbon for creep strength. |
E308H-16 |
AWS A5.4 E308H-16 |
High C, coated electrode |
SMAW for field repairs; good for thick plates. |
ER321 |
AWS A5.9 ER321 |
Ti-stabilized, low C |
For titanium-stabilized welds to reduce sensitization risk. |
See sa240 gr 304h for base material.
To maintain the SA 240 Type 304H stainless steel’s high-temperature strength and corrosion resistance, follow these best practices:
These practices ensure welds match the base metal’s performance. For low-carbon alternatives, see sa240 gr 304l.
Avoid processes like oxyacetylene due to high heat risk.
For stabilized grades, see sa240 gr 321.
SA 240 Type 304H stainless steeloffers good corrosion resistance in mild acids and atmospheric conditions. The high carbon content (0.04-0.10%) risks sensitization during welding, potentially depleting chromium in the weld zone and reducing corrosion resistance. Using recommended fillers and post-weld annealing mitigates this. For chloride-heavy environments, see sa240 gr 316l.
Welded SA 240 Type 304H stainless steel is used in:
For high-temperature stability, see sa240 gr 321h.
As of October 19, 2025, SA240 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.
ER308H is recommended for TIG/MIG, matching the high-carbon content for creep resistance and high-temperature strength.
Use low heat input (<2.0 kJ/mm), interpass temperature ≤300°F (149°C), and post-weld annealing to prevent sensitization and maintain corrosion resistance.
GTAW (TIG) for precision, GMAW (MIG) for efficiency, and SMAW (Stick) for field repairs; avoid high-heat processes like oxyacetylene.
304H’s higher carbon (0.04-0.10%) risks sensitization, requiring annealing, while 316L’s low carbon (≤0.03%) and molybdenum make it more weld-friendly for corrosive environments. See sa240 gr 316l.
Clean surfaces, use argon shielding, and anneal post-weld to avoid carbide precipitation and ensure high-temperature durability.
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