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316h Stainless Steel Sheet & Plate

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316h Stainless Steel Sheet & Plate (UNS S31609,1.4919)

316H stainless steel, designated as UNS S31609, is a high-carbon version of the standard 316 stainless steel, designed to offer enhanced strength and stability at elevated temperatures. Like 316, it contains 16-18% chromium, 10-14% nickel, and 2-3% molybdenum, but with a higher carbon content (0.04% to 0.10%) to improve its mechanical properties at high temperatures. This makes 316H stainless steel particularly suitable for high-stress, high-temperature applications in industries like petrochemical, power generation, and marine environments.

 

Key Features

  • High-Temperature Strength: The increased carbon content in 316H enhances its strength and resistance to creep, making it ideal for high-temperature applications (up to approximately 870°C in continuous service).
  • Superior Corrosion Resistance: Like 316, 316H exhibits excellent resistance to oxidation, pitting, and crevice corrosion, particularly in marine environments and in the presence of chloride ions.
  • Mechanical Properties: 316H has enhanced tensile strength, with values typically around 520-720 MPa, making it more suitable for high-temperature applications where strength is critical.
  • Weldability and Fabricability: While it is designed for high-temperature applications, 316H remains weldable and can be fabricated easily, although care must be taken to avoid excessive heat input during welding to prevent carbide precipitation.

 

Technical Specifications:

  • UNS Number: S31609
  • DIN/EN Designation: 1.4919

Available Thickness

3/8″1/2″5/8″3/4″1″
9.5mm12.7mm15.9mm19mm25.4mm
1 1/4″1 1/2″1 3/4″2″
31.8mm38.1mm44.5mm50.8mm
316h-stainless-steel-sheet-plate

Application

  • Chemical Processing
  • Aerospace
  • Power Generation
  • Oil and Gas
  • Food and Beverage Industry
  • Construction and Architecture
  • Pharmaceutical Industry

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

  • High Molybdenum Content: The inclusion of molybdenum in 316H enhances its resistance to corrosion, particularly in environments with chlorides or other halides. This makes it suitable for marine and coastal applications.
  • Pitting and Crevice Corrosion: 316H offers superior resistance to pitting and crevice corrosion compared to standard stainless steels. This is particularly important in environments where the material is exposed to saltwater or acidic conditions.
  • Oxidation Resistance: 316H stainless steel maintains its integrity and resists scaling even at high temperatures, thanks to its high chromium content. This makes it perfect for high-temperature applications.
  • Intergranular Corrosion: The high carbon content of 316H can sometimes lead to sensitization during welding. However, with proper heat treatment, this risk can be mitigated, ensuring the material remains resistant to intergranular corrosion.
  • Stress Corrosion Cracking: 316H is also resistant to stress corrosion cracking, especially in chloride environments. This property is crucial for applications where the material is under constant mechanical stress.

Chemical Composition for Stainless Steel Plate 316H

ElementComposition (%)
Chromium (Cr)16.0 – 18.0
Nickel (Ni)10.0 – 14.0
Molybdenum (Mo)2.0 – 3.0
Carbon (C)0.04 – 0.10
Manganese (Mn)≤ 2.0
Silicon (Si)≤ 0.75
Phosphorus (P)≤ 0.045
Sulfur (S)≤ 0.030
Nitrogen (N)≤ 0.10
Iron (Fe)Balance

Physical Properties for Stainless Steel Plate 316H

PropertyValue
Density7.98 g/cm³ (0.289 lb/in³)
Melting Point1371 – 1399°C (2500 – 2550°F)
Tensile Strength515 MPa (75 ksi) minimum
Yield Strength205 MPa (30 ksi) minimum
Elongation40% minimum in 50 mm
Hardness, Rockwell B95 maximum
Modulus of Elasticity193 GPa (28 x 10⁶ psi)
Thermal Conductivity16.3 W/m·K (112.8 BTU/hr·ft·°F) at 100°C
Specific Heat Capacity500 J/kg·K (0.12 BTU/lb·°F) at 0-100°C
Electrical Resistivity740 nΩ·m (29.1 μΩ·in) at 20°C

Mechanical Properties for Stainless Steel Plate 316H

PropertyValue
Tensile Strength515 MPa (75 ksi) minimum
Yield Strength205 MPa (30 ksi) minimum
Elongation40% minimum in 50 mm
Hardness, Rockwell B95 maximum
Modulus of Elasticity193 GPa (28 x 10⁶ psi)
Impact Toughness75 J (55 ft-lb) at room temperature (Charpy V-notch)

Fabrication Data

  • Machinability: Good, though slower compared to other grades due to its higher nickel and molybdenum content.
  • Weldability: Excellent; can be welded using conventional methods such as TIG, MIG, and stick welding. Preheating is generally not required, but post-weld heat treatment may be recommended in some cases.
  • Formability: Can be cold-formed with ease. However, it may work-harden quickly.
  • Heat Treatment: Solution annealing at 1010-1120°C (1850-2050°F), followed by rapid cooling, to restore corrosion resistance.
  • Corrosion Resistance: Superior resistance to pitting and crevice corrosion, particularly in chloride environments.

Conclusion:

316H stainless steel sheet and plate offer a superior combination of properties, making them ideal for demanding applications. Their excellent corrosion resistance, high-temperature strength, and good weldability make them a valuable material in various industries.

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