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310H Stainless Steel Sheet & Plate

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310H Stainless Steel Sheet & Plate (UNS S31009)

At DNYA Stainless Steel, we offer premium-quality 310H Stainless Steel Sheets & Plates, engineered to withstand extreme heat, thermal cycling, and oxidation in the most demanding environments. As a high-carbon version of standard 310 stainless steel, 310H (UNS S31009) delivers enhanced strength, creep resistance, and structural stability under prolonged high-temperature exposure.

 

Trusted across industries such as refineries, power plants, petrochemical facilities, and heat treatment equipment, 310H stainless steel offers dependable performance where conventional stainless grades fail.

 

What is 310H Stainless Steel?

310H stainless steel is a high-carbon austenitic stainless steel, specifically designed for elevated temperature service. It contains the same high levels of chromium (24–26%) and nickel (19–22%) as standard 310, but with a higher carbon content (≥ 0.04%) to provide superior creep strength and thermal stability in pressure vessel and structural applications.

 

Ideal for service in oxidizing atmospheres up to 1100°C (2012°F), 310H maintains its integrity in high-stress, high-heat, and aggressive gas environments, making it a top choice for pressure-retaining and long-duration thermal applications.

 

Key Features 

  • Enhanced High-Temperature Strength
    Maintains mechanical strength at temperatures beyond 1000°C.

  • Excellent Oxidation and Scaling Resistance
    Resists spalling and corrosion in oxidizing atmospheres.

  • Superior Creep Resistance
    High carbon content ensures better performance under thermal stress.

  • Non-Magnetic in Annealed Condition
    Becomes slightly magnetic after cold work.

  • Good Formability and Weldability
    Suitable for most conventional fabrication techniques.

  • Conforms to ASTM A240 / ASME SA240
    Approved for use in pressure vessels and heat exchangers.

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 3/4″2″2 1/4″2 1/2″3″
31.8mm38.1mm44.5mm50.8mm57.2mm63.5mm76.2mm
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

Corrosion Resistance

  • Oxidation Resistance: The high chromium (24.0-26.0%) and nickel (19.0-22.0%) content in Stainless Steel Plate 310H enhances its resistance to oxidation. This makes it particularly suitable for applications involving continuous high temperatures and exposure to oxidizing agents.
  • Sulfuric Acid Resistance: Stainless Steel Plate 310H is well-suited for environments with sulfurous gases. Its resistance to sulfuric acid and other sulfur-containing compounds ensures longevity and reliability in harsh conditions.
  • Acid Resistance: The alloy’s composition provides robust resistance against acidic environments, including dilute acids. This makes it a reliable choice for chemical processing and other applications where exposure to acids is a concern.
  • Corrosion in High-Temperature Conditions: One of the standout features of 310H is its ability to maintain resistance to corrosion even at elevated temperatures. This property is crucial for components in high-temperature applications such as furnace parts, heat exchangers, and gas turbines.

Chemical Composition of Stainless Steel Plate 310H

ElementContent Range (%)
Chromium (Cr)24.0 – 26.0
Nickel (Ni)19.0 – 22.0
Carbon (C)≤ 0.25
Manganese (Mn)≤ 2.0
Silicon (Si)≤ 1.5
Phosphorus (P)≤ 0.045
Sulfur (S)≤ 0.03

Physical Properties for Stainless Steel Plate 310H

PropertyValue
Density7.8 g/cm³
Melting Point1400 – 1450°C
Thermal Conductivity16.2 W/m·K
Specific Heat Capacity500 J/kg·K
Modulus of Elasticity200 GPa
Poisson’s Ratio0.3
Thermal Expansion Coefficient15.7 µm/m·K

Mechanical Properties for Stainless Steel Plate 310H

PropertyValue
Tensile Strength520 MPa (minimum)
Yield Strength205 MPa (minimum)
Elongation35% (minimum)
HardnessBrinell 220 HB (maximum)
Modulus of Elasticity200 GPa
Impact Toughness27 J (minimum at -196°C)
Proof Strength205 MPa (minimum)
Reduction of Area45% (minimum)

Fabrication Data

Welding

  • Process Compatibility: Stainless Steel Plate 310H is weldable using common methods such as TIG (Tungsten Inert Gas), MIG (Metal Inert Gas), and Stick welding. The high chromium and nickel content contributes to good weldability.
  • Filler Material: Use filler materials such as ER310 or ENiCrFe-3 to match the composition of the base metal and maintain strength and corrosion resistance.
  • Preheating: Preheating is generally not required, but it can be beneficial to avoid thermal cracking in thicker sections.
  • Post-Weld Heat Treatment: For critical applications, post-weld heat treatment may be recommended to relieve stresses and improve mechanical properties.

Machining

  • Machining Techniques: Stainless Steel Plate 310H can be machined using standard techniques such as turning, milling, and drilling. Due to its hardness, carbide-tipped tools are often recommended.
  • Cutting: Plasma cutting, water jet cutting, and laser cutting are effective methods for cutting Stainless Steel Plate 310H. Ensure that cutting tools are sharp and well-maintained to achieve clean edges and minimize tool wear.
  • Tooling Recommendations: Use high-speed steel (HSS) or carbide tools. Lubricants and coolants can help to reduce tool wear and improve surface finish.

Heat Treatment

  • Annealing: Annealing can improve ductility and relieve internal stresses. Typical annealing temperatures for Stainless Steel Plate 310H range from 1040°C to 1150°C. Rapid cooling is generally recommended.
  • Hardening: Stainless Steel Plate 310H is not typically hardened by heat treatment. Its hardness is generally achieved through alloying elements and cold working.

Surface Finish

  • Polishing: The surface finish can be enhanced through polishing. Stainless Steel Plate 310H can achieve a high-quality finish suitable for aesthetic applications or where reduced surface roughness is required.
  • Cleaning: Regular cleaning helps maintain the corrosion-resistant properties of Stainless Steel Plate 310H. Use non-abrasive cleaning agents and methods to avoid damaging the surface.

Handling and Storage

  • Handling: Use appropriate lifting equipment and methods to prevent damage. Avoid dropping or mishandling, as this can cause surface imperfections or deformations.
  • Storage: Store Stainless Steel Plate 310H in a dry, clean environment to prevent contamination. Avoid contact with reactive materials that could lead to corrosion or staining.
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For more information or to request a quote, contact us today to discuss how Stainless Steel Plate 304H can meet your specific project needs.