A479 304H Bar Equivalent and Properties

A479 304H: Bar Equivalent and Properties

At Gangsteel, a leading manufacturer and exporter of stainless steel products, we supply high-quality A479 304H stainless steel bars compliant with ASTM A479 and ASME SA 479 standards. A479 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 guide details the bar equivalents and properties of A479 304H, including chemical composition, mechanical properties, physical properties, corrosion resistance, weldability, and applications for uses like high-temperature shafts and fasteners. For inquiries, contact us at admin@gangsteel.com or explore our ASME SA240 Stainless sheet offerings.

Overview of A479 304H Bar

A479 304H bar is specified under ASTM A479 for stainless steel bars and shapes used in pressure vessels and general applications. As the bar equivalent to SA 240 GR 304H plates and SA 182 F304H forgings, it features 0.04-0.10% carbon for enhanced creep and rupture strength. Non-magnetic with a density of 8.00 g/cm³, A479 304H bar is forged or hot-rolled for components like shafts and bolts in high-temperature environments. See sa240 gr 304h for plate equivalents.

Chemical Composition

The chemical composition of A479 304H bar ensures high-temperature performance:

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

Mechanical Properties

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

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

A479 304H bar resists mild acids and atmospheric conditions, outperforming SS204 vs SS 304. Higher carbon risks sensitization in forged 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 for forged components. See sa240 gr 321.

Applications of A479 304H Bar

A479 304H bar is used in:

• Shafts and rods for high-temperature machinery.
• Fasteners and bolts in pressure vessels.
• Valve stems in heat exchangers.
• Structural bars in boilers.

For cost-effective options, see sa240 gr 201.

Pricing and Availability

As of October 19, 2025, A479 304H bar prices (6-500mm diameter) range from $1.80-$4.00/kg. Gangsteel offers $1.80/kg FOB (MOQ 1 ton) for sa240 gr 304h. Contact admin@gangsteel.com or visit astm a 240 stainless plate.

FAQ on A479 304H Bar Equivalents

What is the chemical equivalence between A479 304H bar and SA 240 GR 304H plate?

Identical: 0.04-0.10% C, 18-20% Cr, 8-10.5% Ni, ensuring high-temperature compatibility.

How do mechanical properties differ between A479 304H bar and SA 240 GR 304H plate?

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

What are the physical properties of A479 304H bar equivalent to SA 240 plate?

Density 8.00 g/cm³, melting point 1400-1450°C, max service temperature 1500°F (815°C) continuous.

What applications use A479 304H bar as equivalent to SA 240 GR 304H plate?

High-temperature shafts, fasteners, and valve stems in boilers, heat exchangers, and pressure vessels.

Why choose Gangsteel for A479 304H bar or SA 240 GR 304H plate?

Competitive pricing ($1.80/kg FOB for bar, $1.60/kg for plate), 600+ ton stock, custom fabrication, and full certifications.