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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.
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.
The chemical composition of SA 240M Type 304H uses metric units for global consistency:
Element |
Range (%) |
---|---|
Carbon (C) |
0.04 - 0.10 |
Manganese (Mn) |
0.00 - 2.00 |
Silicon (Si) |
0.00 - 0.75 |
Phosphorus (P) |
0.00 - 0.045 |
Sulfur (S) |
0.00 - 0.030 |
Chromium (Cr) |
18.00 - 20.00 |
Nickel (Ni) |
8.00 - 10.50 |
Nitrogen (N) |
0.00 - 0.10 |
Iron (Fe) |
Balance |
High carbon (0.04-0.10%) boosts creep resistance. See sa240 gr 304l.
Mechanical properties for annealed plates (8-75 mm thick) in metric units:
Property |
Value (Minimum) |
---|---|
Tensile Strength |
515 MPa |
Yield Strength (0.2% Offset) |
205 MPa |
Elongation (A5, 50 mm) |
40% |
Hardness (Brinell) |
≤ 201 HB |
Hardness (Rockwell B) |
≤ 92 HRB |
High strength at high temperatures (25.5 ksi allowable at 1000°F). See sa240 gr 304.
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.
Fair with ER308H fillers; low heat input (<2.0 kJ/mm) and annealing required. See sa240 gr 321.
SA 240M Type 304His used in:
For cost-effective options, see sa240 gr 201.
Standard |
Equivalent Grade |
UNS Number |
---|---|---|
ASTM A240 |
A240 304H |
S30409 |
EN (Europe) |
1.4948 (X6CrNi18-10) |
S30409 |
JIS (Japan) |
SUS 304H |
S30409 |
GB (China) |
06Cr19Ni10H |
S30409 |
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.
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.
ASTM A240 304H, identical to SA 240M Type 304H for high-temperature service.
EN 1.4948 (X6CrNi18-10), matching the high-carbon composition for creep resistance.
JIS SUS 304H, used in Asia for piping and sheets with similar properties.
GB 06Cr19Ni10H, prevalent in Chinese manufacturing for high-temperature applications.
They ensure global sourcing compatibility for high-temperature applications like boilers.
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