SA240 SS 304H Material Data Sheet Properties and Composition

SA240 SS 304H Material Data Sheet: Properties and Composition

At Gangsteel, a leading manufacturer and exporter of stainless steel products, we supply premium SA240 SS 304H stainless steel plates compliant with ASME SA 240 and ASTM A240 standards. SA240 SS 304H, also known as AISI 304H, UNS S30409, or EN 1.4948, is a high-carbon austenitic stainless steel optimized for high-temperature strength and creep resistance up to 1500°F (815°C).

This material data sheet provides a complete overview of the properties and composition of SA240 SS 304H for applications like boilers, heat exchangers, and SA 240 GR 304 pipe. For inquiries, contact us at admin@gangsteel.com or explore our ASME SA240 Stainless sheet products.

Material Designation and Standards

• Designation: AISI 304H, UNS S30409, EN 1.4948, JIS SUS 304H, GB 06Cr19Ni10H.
• Standards: ASME SA 240 GR 304H, ASTM A240 304H, for plates, sheets, and strips in pressure vessels and high-temperature service.
• Form: Plates, sheets, bars (A479 TP 304H), pipes (SA 312 TP 304H), flanges (SA 182 F304H).
• Condition: Annealed; non-magnetic in annealed state (SA 240 304 non magnetic).
• Density: 8.00 g/cm³.

Chemical Composition

The chemical composition of SA240 SS 304H ensures high-temperature performance and corrosion resistance:

• Carbon: High (0.04-0.10%) enhances creep resistance.
• Chromium: 18-20% for corrosion resistance.
• Nickel: 8-10.5% for non-magnetic austenitic structure.

Mechanical Properties

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

• High-temperature: 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 at 100°C.
• Coefficient of Thermal Expansion: 17.2 × 10⁻⁶/K (20-100°C).
• Electrical Resistivity: 0.72 × 10⁻⁶ Ω·m.
• Modulus of Elasticity: 193 GPa.
• Max Service Temperature: Continuous 1500°F (815°C); intermittent 1600°F (871°C).

Corrosion Resistance

SA240 SS 304Hresists mild acids, freshwater, 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 post-weld annealing (1870-2050°F) required to avoid sensitization. See sa240 gr 304l for low-carbon variant.

Heat Treatment

• Annealing: 1870-2100°F (1020-1149°C) followed by rapid cooling.
• Purpose: Dissolves carbides, restores corrosion resistance.

Applications

SA240 SS 304His used in:

• Boilers and pressure vessels.
• Heat exchangers.
• Superheaters and reheaters in power plants.
• High-temperature chemical processing equipment.

For cost-effective alternatives, see sa240 gr 201.

Pricing and Availability

As of October 19, 2025, SA240 SS 304H plate prices (2B finish, 3-6mm) range from $1.60-$3.50/kg globally. 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 SA240 SS 304H Data Sheet

What is the density of SA240 SS 304H?

8.00 g/cm³, supporting lightweight designs for high-temperature applications.

What is the melting point of SA240 SS 304H?

1400-1450°C, suitable for high-temperature processing and service.

What is the thermal conductivity of SA240 SS 304H?

16.2 W/m·K at 100°C, moderate for heat transfer in high-temperature applications.

What is the coefficient of thermal expansion for SA240 SS 304H?

17.2 × 10⁻⁶/K (20-100°C), stable for thermal expansion in high-heat environments.

What is the maximum service temperature for SA240 SS 304H?

Continuous up to 1500°F (815°C), with excellent creep resistance for boilers and heat exchangers.