SA 240M Type 304H Metric Specifications and Equivalents

SA 240M Type 304H: Metric Specifications and Equivalents

At Gangsteel, a leading manufacturer and exporter of stainless steel products, we supply premium SA 240M Type 304H plates compliant with ASME SA 240M and ASTM A240M standards. SA 240M Type 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). The "M" in SA 240M indicates metric units, ensuring international compatibility. This article details the metric specifications and equivalents of SA 240M Type 304H. Contact us at admin@gangsteel.com or explore our ASME SA240 Stainless sheet.

Overview of SA 240M Type 304H

SA 240M Type 304His specified under ASME SA 240M for chromium and chromium-nickel stainless steel plates, sheets, and strips used in pressure vessels and high-temperature service. With 0.04-0.10% carbon, it enhances creep and rupture strength compared to standard 304 or 304L. Non-magnetic with a density of 8.00 g/cm³, it’s ideal for global applications. The metric designation supports SI units for international trade. See sa240 gr 304h.

Metric Chemical Specifications

The chemical composition of SA 240M Type 304H uses metric units for global consistency:

High carbon (0.04-0.10%) boosts creep resistance. See sa240 gr 304l.

Metric Mechanical Specifications

Mechanical properties for annealed plates (8-75 mm thick) in metric units:

High strength at high temperatures (25.5 ksi allowable at 1000°F). See sa240 gr 304.

Physical Properties in Metric Units

• Density: 8.00 g/cm³.
• Melting Point: 1400-1450°C.
• Thermal Conductivity: 16.2 W/m·K at 100°C.
• Coefficient of Thermal Expansion: 17.2 × 10⁻⁶/K (20-100°C).
• Max Service Temperature: 815°C continuous.

Corrosion Resistance

SA 240M Type 304Hresists 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

SA 240M Type 304His used in:

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

For cost-effective options, see sa240 gr 201.

Equivalents of SA 240M Type 304H

ASTM A240 304H: Identical to SA 240M Type 304H for general high-temperature service.

EN 1.4948: European equivalent with matching high-carbon composition for creep resistance.

JIS SUS 304H: Japanese standard for Asian markets, used in piping and sheets.

GB 06Cr19Ni10H: Chinese equivalent for domestic manufacturing.

Pricing and Availability

As of October 19, 2025, SA 240M Type 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 SA 240M Type 304H Equivalents

What is the ASTM equivalent of SA 240M Type 304H?

ASTM A240 304H, identical to SA 240M Type 304H for high-temperature service.

What is the EN equivalent of SA 240M Type 304H?

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

What is the JIS equivalent of SA 240M Type 304H?

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

What is the GB equivalent of SA 240M Type 304H?

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

Why are equivalents important for SA 240M Type 304H?

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