A240 GR 304H: Material Equivalents and Properties

At Gangsteel, a leading manufacturer and exporter of stainless steel products, we supply high-quality A240 GR 304H stainless steel plates compliant with ASTM A240 and ASME SA 240 standards. A240 GR 304H, also known as AISI 304H, UNS S30409, or 1.4948, is a high-carbon austenitic stainless steel optimized for high-temperature strength and creep resistance up to 1500°F (815°C). This guide covers the material equivalents and key properties of A240 GR 304H, including chemical composition, mechanical properties, physical properties, corrosion resistance, weldability, and applications for uses like plat stainless 304 and SA 240 GR 304 pipe. For inquiries, contact us at admin@gangsteel.com or explore our ASME SA240 Stainless sheet offerings.

Material Equivalents for A240 GR 304H

A240 GR 304H is specified under ASTM A240 for chromium and chromium-nickel stainless steel plates, sheets, and strips used in pressure vessels and high-temperature service. Its equivalents in other standards share the high-carbon composition (0.04-0.10% C, 18-20% Cr, 8-10.5% Ni) and properties, ensuring compatibility for global sourcing. The table below lists key equivalents:

These equivalents facilitate seamless integration in international projects, with minimal variations in testing or certification. For low-carbon variants, see sa240 gr 304l.

Chemical Composition of A240 GR 304H

The chemical composition ensures high-temperature performance and corrosion resistance:

• Carbon: High (0.04-0.10%) boosts creep resistance, higher than 304 (≤0.08%) and 304L (≤0.03%).
• Chromium: 18-20% forms a passive oxide layer for corrosion resistance.
• Nickel: 8-10.5% ensures non-magnetic austenitic structure (SA 240 304 non magnetic).

Mechanical Properties of A240 GR 304H

• High-temperature strength: Allowable stress 25.5 ksi at 1000°F (538°C).

Physical Properties of A240 GR 304H

• Density: 8.00 g/cm³.
• Melting Point: 1400-1450°C.
• Thermal Conductivity: 16.2 W/m·K.
• Coefficient of Thermal Expansion: 17.2 × 10⁻⁶/K.
• Max Service Temperature: 1500°F (815°C) continuous.

Corrosion Resistance

A240 GR 304H resists mild acids and atmospheric conditions, outperforming SS204 vs SS 304. Higher carbon risks sensitization in welds; anneal for protection. See sa240 gr 316l for chlorides.

Weldability

Fair with ER308H fillers; low heat input (<2.0 kJ/mm) and annealing required. See sa240 gr 321.

Applications of A240 GR 304H

A240 GR 304H is used in:

• Boilers and pressure vessels.
• Heat exchangers.
• Power generation piping.
• High-temperature chemical processing.

For cost-effective options, see sa240 gr 201.

Pricing and Availability

As of October 19, 2025, A240 GR 304H 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.

FAQ on A240 GR 304H Equivalents

What is the ASME equivalent of A240 GR 304H?

ASME SA 240 GR 304H, identical to A240 GR 304H for BPVC pressure vessels.

What is the EN equivalent of A240 GR 304H?

EN 1.4948 (X6CrNi18-10), matching the high-carbon composition for creep resistance.

What is the JIS equivalent of A240 GR 304H?

JIS SUS 304H, used in Asia for piping and sheets with similar properties.

What is the GB equivalent of A240 GR 304H?

GB 06Cr19Ni10H, prevalent in Chinese manufacturing for high-temperature applications.

Why are equivalents important for A240 GR 304H?

They ensure global sourcing compatibility for high-temperature applications like boilers.