sa240 gr 304H Filler Metal: Selection for High-Temperature W

SA240 GR 304H Filler Metal: Selection for High-Temperature Welds

At Gangsteel, a leading manufacturer and exporter of stainless steel products, we supply premium SA240 GR 304H plates compliant with ASME SA 240 and ASTM A240 standards. SA240 GR 304H filler metal is crucial for welding this high-carbon austenitic grade (UNS S30409, AISI 304H, EN 1.4948), ensuring creep resistance and corrosion stability up to 1500°F (815°C). This guide outlines filler metal selection, specifications, and best practices for applications like boilers and heat exchangers. Contact us at admin@gangsteel.com or explore our ASME SA240 Stainless sheet offerings.

Why Filler Metal Selection Matters for SA240 GR 304H

Filler metal for SA240 GR 304H must match the base metal’s high-carbon content (0.04-0.10%) to preserve high-temperature strength and minimize sensitization risks. Poor selection can lead to carbide precipitation, reducing corrosion resistance in welds. Choose fillers that ensure compatibility with the austenitic structure (SA 240 304 non magnetic) and high-temperature performance.

Recommended Filler Metals for SA240 GR 304H

The primary filler for SA240 GR 304H filler metal is high-carbon austenitic types. Below are top recommendations:

• ER308H: Best for TIG/GMAW; high carbon matches 304H to avoid dilution.
• E308H-16: For stick welding; high-carbon flux for coastal strength.
• ER321: Titanium-stabilized alternative for enhanced weld stability.

For low-carbon alternatives, see sa240 gr 304l.

Filler Metal Specifications for SA240 GR 304H

Specifications ensure compatibility:

• Carbon Matching: 0.04-0.08% in ER308H aligns with 304H’s 0.04-0.10% for thermal strength.
• Chromium/Nickel: 19-21% Cr and 9-11% Ni maintain corrosion resistance.
• Titanium in ER321: Stabilizes against carbide formation, reducing sensitization.

For welding processes, see sa240 gr 304h.

Best Practices for SA240 GR 304H Filler Metal

• Heat Input: Limit to <2.0 kJ/mm to avoid carbide precipitation in the 797°F-1580°F (425°C-860°C) range.
• Interpass Temperature: ≤300°F (149°C) to prevent sensitization and ensure uniform cooling.
• Shielding Gas: Pure argon or Ar-He mix (10-20 L/min) to protect against oxidation.
• Post-Weld Annealing: Recommended at 1870-2050°F (1020-1120°C) with rapid cooling to restore corrosion resistance.
• Pre-Weld Preparation: Clean surfaces; use low-hydrogen electrodes to avoid cracking.

These practices maintain the SA 240 GR 304H filler metal’s performance. For stabilized alternatives, see sa240 gr 321.

Applications of SA 240 GR 304H Filler Metal

Welded SA 240 GR 304H filler metal is used in:

• Boilers and pressure vessels (steam drums).
• Heat exchangers (tubes, shells).
• Power generation (superheaters).
• High-temperature piping and fittings (SA 240 GR 304 pipe).

For chloride-heavy environments, see sa240 gr 316l.

Pricing and Availability

As of October 19, 2025, SA240 TP 304H filler wire prices range from $2.00-$4.00/kg. Gangsteel offers $2.00/kg FOB (MOQ 1 ton) for ER308H, including sizes 0.8-4.0 mm. Contact admin@gangsteel.com or visit sa240 gr 304h.

FAQ on SA 240 GR 304H Filler Metal

What is the best filler metal for SA 240 GR 304H?

ER308H is recommended for TIG/MIG, matching the high-carbon content for creep resistance and high-temperature strength.

What are the specifications of SA 240 GR 304H filler metal?

AWS A5.9 ER308H with 0.04-0.08% C, 19.5-21.5% Cr, 9.0-11.0% Ni; diameters 0.8-4.0 mm; use with argon shielding.

Why is ER308H preferred for SA 240 GR 304H welding?

It matches the 0.04-0.10% carbon to maintain high-temperature strength and prevent dilution during welding.

What alternatives to ER308H are available for SA 240 GR 304H filler metal?

ER308 for general use, ER321 for titanium stabilization, or E308H-16 for stick welding; choose based on application.

What precautions are needed when using SA 240 GR 304H filler metal?

Limit heat input to <2.0 kJ/mm, interpass ≤300°F, and anneal post-weld to avoid sensitization and ensure high-temperature durability.