304H Stainless Steel Data Sheet Complete Specifications

304H Stainless Steel Data Sheet: Complete Specifications

At Gangsteel, a leading manufacturer and exporter of stainless steel products, we supply premium 304H stainless steel plates and components compliant with ASME SA 240 and ASTM A240 standards. 304H stainless steel, 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 comprehensive data sheet provides complete specifications for 304H stainless steel, including chemical composition, mechanical properties, physical properties, corrosion resistance, weldability, and applications. 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, pipes (SA 312 TP 304H equivalent), 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 304H stainless steel ensures high-temperature performance and corrosion resistance:

• Carbon: High (0.04-0.10%) boosts 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

304H stainless steelresists mild acids, freshwater, and atmospheric conditions, outperforming SS204 vs SS 304. Higher carbon risks sensitization in welds; anneal for protection. Less chloride-resistant than SA 240 GR 316L. See sa240 gr 316l.

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

304H stainless steelis used in:

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

For cost-effective options, see sa240 gr 201.

Pricing and Availability

As of October 19, 2025, 304H stainless steel 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 304H Stainless Steel Data Sheet

What is the density of 304H stainless steel?

8.00 g/cm³, identical to 304 and 304L, supporting lightweight designs.

What is the melting point of 304H stainless steel?

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

What is the thermal conductivity of 304H stainless steel?

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

What is the coefficient of thermal expansion for 304H stainless steel?

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

What is the maximum service temperature for 304H stainless steel?

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