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309H Stainless Steel Sheet & Plate

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309H Stainless Steel Sheet & Plate (UNS S30909,1.4828)

DNYA Stainless Steel is a trusted supplier of 309H Stainless Steel Sheets & Plates, a high-carbon variant of 309 stainless steel specifically engineered for enhanced strength and creep resistance at elevated temperatures. With its excellent heat resistance, superior oxidation protection, and high-temperature structural integrity, 309H (UNS S30909 / 1.4828) is ideal for use in furnaces, kilns, heat exchangers, and petrochemical systems operating under intense thermal conditions.

 

Backed by international standards like ASTM A240 and ASME SA240, our 309H stainless steel products are available in various thicknesses and surface finishes, with mill test certification and value-added services.

 

What is 309H Stainless Steel?

309H stainless steel is a high-carbon version of 309 stainless steel, designed for applications requiring superior high-temperature strength and improved creep resistance. It contains similar levels of chromium (22–24%) and nickel (12–15%) as 309 but includes a carbon content ≥ 0.04%, which enhances structural performance in elevated temperature service beyond 1000°C (1832°F).

 

Its excellent oxidation resistance, toughness, and mechanical strength make it a preferred material in the thermal processing, petrochemical, and power generation sectors.

 

Key Features 

  • Outstanding High-Temperature Performance
    Sustains strength and stability in continuous service above 1000°C.

  • Excellent Creep Resistance
    Withstands long-term stress at elevated temperatures.

  • Oxidation & Scale Resistant
    Ideal for furnace linings and exhaust manifolds.

  • Non-Magnetic in Annealed State
    Becomes slightly magnetic after cold working.

  • Good Fabrication & Weldability
    Compatible with conventional forming and welding techniques.

  • ASME & ASTM Compliant
    Suitable for pressure vessels and critical heat-related applications.

Available Thickness

3/16″1/4″5/16″3/8″1/2″5/8″3/4″1″
4.8mm6.3mm7.9mm9.5mm12.7mm15.9mm19mm25.4mm
1 1/4″1 1/2″1 5/8″1 3/4″2″2 1/2″3″
31.8mm38.1mm41.3mm44.5mm50.8mm63.5mm76.2mm
310h-stainless-steel-sheet-plate

Application

  • Automotive
  • Chemical and Pharmaceutical
  • Fertilizer
  • Food Processing and Handling
  • Manufacturing
  • Mining
  • Oil & Gas
  • Phosphate Mining

Standard

  • ASTM A240 / A240M
  • ASTM A276 / A276M
  • ASTM A312 / A312M
  • ISO 15510
  • EN 10088-2
  • IN 10204
  • HE G4304
  • HE G4305
  • ASME SA240 / SA240M
  • ASME SA312 / SA312M

Worldwide Equivalent Grade 309H

Country
Standard
Grade
United States
ASTM
309H
United States
ANSI
309H
European Union
EN
X15CrNiSi20-12
Germany
DIN
1.4828
Japan
JIS
SUS 309H
United Kingdom
BS
309S24
France
AFNOR
Z15CN24-12
Russia
Gost
20Kh23N18

Corrosion Resistance

Oxidation Resistance: 309H is highly resistant to oxidation at elevated temperatures, making it suitable for applications where exposure to high heat is a concern. It can withstand temperatures up to around 980°C (1800°F) before losing its protective oxide layer.

Corrosion in Various Environments:

  • Sulfur Compounds: It shows good resistance to sulfurous gases and other high-temperature corrosive environments.
  • Acidic and Alkaline Conditions: While it performs well in certain acidic and alkaline conditions, it’s less resistant than more specialized alloys like 316L or 904L. For severe environments, its performance should be evaluated carefully.
  • Chloride Stress Corrosion: Compared to grades like 316, 309H is less resistant to chloride stress corrosion cracking. It’s not typically recommended for marine or saltwater applications where chloride exposure is a significant concern.

Heat Resistance: 309H’s ability to resist scaling and oxidation at high temperatures makes it suitable for use in heat exchangers, furnace parts, and similar applications where high-temperature corrosion is an issue.

309H Chemical Composition

ElementComposition (%)
Carbon (C)0.20 max
Manganese (Mn)2.00 – 2.50
Silicon (Si)1.00 max
Chromium (Cr)24.00 – 26.00
Nickel (Ni)13.00 – 17.00
Phosphorus (P)0.045 max
Sulfur (S)0.030 max
Nitrogen (N)0.20 – 0.40

309H Physical Properties

Property Value
Density 7.93 g/cm³ (7930 kg/m³)
Melting Point 1400-1450°C (2550-2640°F)
Thermal Conductivity 15.1 W/m·K
Specific Heat Capacity 500 J/kg·K
Modulus of Elasticity 200 GPa (29,000 ksi)
Poisson’s Ratio 0.3
Thermal Expansion 16.0 × 10⁻⁶ /°C (9.0 × 10⁻⁶ /°F)
Electrical Resistivity 0.72 µΩ·m

309H Mechanical Properties

PropertyValue
Tensile Strength515-690 MPa (75-100 ksi)
Yield Strength205 MPa (30 ksi)
Elongation (in 50 mm)40%
Hardness190-220 HB (Brinell)
Modulus of Elasticity200 GPa (29,000 ksi)
Poisson’s Ratio0.3

Fabrication Data

  • Cutting: Stainless steel plates can be cut using plasma arc cutting, laser cutting, or water jet cutting. Ensure proper equipment settings to avoid overheating and warping.
  • Welding: 309H can be welded using various methods, including MIG, TIG, and stick welding. The filler material typically used is 309L or 309Mo depending on specific requirements. Pre-heating and post-weld heat treatment may be necessary to avoid cracking.
  • Machining: This alloy is machinable with standard tools, though it can be harder to machine than other stainless steels due to its higher chromium and nickel content. Use cutting tools with good wear resistance and proper lubrication.
  • Heat Treatment: 309H is used in the annealed condition. If heat treatment is required, the recommended temperature range is between 1010-1150°C (1850-2100°F). Rapid cooling is necessary to avoid carbide precipitation.
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