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309H Stainless Steel Sheet & Plate

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

309H stainless steel sheet and plate are high-temperature resistant materials commonly used in demanding applications that require superior strength and durability. Part of the 300 series, 309H is an austenitic chromium-nickel steel alloy with a higher carbon content than 309, which enhances its high-temperature strength and oxidation resistance.

 

Key Features 309H stainless steel sheet and plate

High-Temperature Resistance: It is designed for high-temperature applications, offering excellent resistance to oxidation and carburization at temperatures up to 1900°F (1038°C).

Corrosion Resistance: Provides strong resistance to a wide variety of corrosive environments, including those in the chemical and food industries.

Excellent Weldability: 309H offers good weldability, making it ideal for applications requiring complex welding operations.

High Strength: It has a higher carbon content compared to 309 stainless steel, improving its strength at elevated temperatures.

Durability: Resistant to scaling and other forms of deterioration in high-heat environments, making it durable for heavy industrial use.

Versatile Applications: Often used in heat exchangers, furnaces, boilers, and various high-temperature environments.

 

Technical Specifications

  • UNS Number: S30909
  • DIN/EN Designation: 1.4828

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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