A240 Type 304H ASTM Equivalent to ASME SA 240

A240 Type 304H: ASTM Equivalent to ASME SA 240

At Gangsteel, a leading manufacturer and exporter of stainless steel products, we supply premium A240 Type 304H stainless steel plates compliant with ASTM A240 and ASME SA 240 standards. A240 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). This article explains the equivalence between ASTM A240 Type 304H and ASME SA 240 Grade 304H, including specifications, properties, 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.

Equivalence Between ASTM A240 Type 304H and ASME SA 240 Grade 304H

ASTM A240 Type 304Hand ASME SA 240 Grade 304H are technically identical, with ASME SA 240 being the direct adoption of ASTM A240 for use in the ASME Boiler and Pressure Vessel Code (BPVC). Both standards specify chromium and chromium-nickel stainless steel plates, sheets, and strips for pressure vessels and general corrosive service. The equivalence means:

• Technical Requirements: Identical chemical composition, mechanical properties, and testing (e.g., tensile, hardness).
• Differences: ASME SA 240 adds BPVC certification, traceability, and additional testing (e.g., impact, bend) for pressure vessel compliance, while ASTM A240 is for general applications.
• Interchangeability: A240 Type 304H can be used in ASME applications if certified under SA 240, but SA 240 is mandatory for BPVC-coded vessels.

Gangsteel's sa240 gr 304h plates meet both standards.

Chemical Composition

The chemical composition of A240 Type 304H (equivalent to ASME SA 240 Grade 304H) is:

• Carbon: High (0.04-0.10%) for creep resistance, higher than 304 (≤0.08%) and 304L (≤0.03%).
• Chromium/Nickel: Ensure corrosion resistance and non-magnetic properties (SA 240 304 non magnetic).

Mechanical Properties

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

Physical Properties

• 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 Type 304H (ASME SA 240 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

A240 Type 304H (ASME SA 240 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 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 A240 Type 304H Equivalence to ASME SA 240

Is A240 Type 304H equivalent to ASME SA 240 GR 304H?

Yes, ASME SA 240 GR 304H is the ASME adoption of A240 Type 304H, with identical technical specifications; SA 240 adds BPVC certification for pressure vessels.

What are the chemical differences between A240 Type 304H and SA 240 GR 304H?

None; both share the same composition (0.04-0.10% C, 18-20% Cr, 8-10.5% Ni).

How do mechanical properties differ between A240 Type 304H and SA 240 GR 304H?

They are the same: tensile strength 515 MPa (75 ksi), yield strength 205 MPa (30 ksi), elongation 40%.

What applications use A240 Type 304H equivalent to ASME SA 240 GR 304H?

High-temperature pressure vessels, boilers, and heat exchangers, where creep resistance is critical.

Why choose Gangsteel for A240 Type 304H or SA 240 GR 304H?

Competitive pricing ($1.60/kg FOB), 600+ ton stock, custom sizes, and full certifications for global delivery. See sa240 gr 304h.