Stainless Steel 304H Plates are an integral part of the stainless steel family, specially designed to withstand high-temperature environments. As a high-carbon version of the widely used 304 grade, 304H provides enhanced strength and durability, making it an ideal choice for industrial sectors that require resistance to extreme heat and corrosive atmospheres.
What is Stainless Steel 304H?
Stainless Steel 304H is a modification of the austenitic 304 grade, with a higher carbon content — typically ranging between 0.04% and 0.10%. This increased carbon concentration enhances the material’s high-temperature strength, making it suitable for pressure vessels and structural components in elevated temperature service.
304H conforms to ASTM A240 standards and is most commonly used in plate form. These plates are widely recognized for their superior mechanical properties and excellent weldability.
Key Chemical Composition of SS 304H Plates
ElementContent (%)Carbon (C)0.04 – 0.10Chromium (Cr)18.0 – 20.0Nickel (Ni)8.0 – 11.0Manganese (Mn)≤ 2.00Silicon (Si)≤ 0.75Phosphorus (P)≤ 0.045Sulfur (S)≤ 0.030Iron (Fe)Balance
The high chromium and nickel content provide excellent oxidation and corrosion resistance, while the carbon addition boosts tensile and yield strength at elevated temperatures.
Mechanical Properties of SS 304H Plates
PropertyValueTensile Strength≥ 515 MPaYield Strength (0.2% offset)≥ 205 MPaElongation (in 50mm)≥ 40%Hardness (Brinell)≤ 201 HBMelting Point1400 – 1450°C
Due to these mechanical properties, 304H performs reliably under high-stress and high-heat conditions.
Key Features and Benefits
- High-Temperature Strength: 304H offers better creep resistance and higher tensile strength at temperatures above 500°C.
- Excellent Corrosion Resistance: Resists oxidation and corrosion in a wide range of environments, including acidic and marine conditions.
- Good Weldability: Suitable for welding by all standard methods, especially suitable for heavy-gauge components.
- Cost-Effective Alternative: Provides a balance between performance and cost, making it a widely preferred option in various sectors.
- Easy Fabrication: It can be easily formed and machined using conventional techniques.
Applications of Stainless Steel 304H Plates
Due to its strength and corrosion resistance, SS 304H plates are used in many high-temperature and high-stress environments:
- Power Generation Plants: Heat exchangers, boilers, and steam piping systems.
- Petrochemical Industry: Pressure vessels and reactors.
- Oil & Gas Sector: Refineries and offshore platforms.
- Nuclear Plants: Reactor core and containment structures.
- Food Processing Units: Components exposed to high heat and corrosive agents.
- Pharmaceutical Industry: Sterile and high-temperature equipment.
304 vs. 304L vs. 304H: What’s the Difference?
GradeCarbon ContentKey Feature304≤ 0.08%Standard grade with balanced properties304L≤ 0.03%Low carbon for improved weldability304H0.04 – 0.10%High carbon for improved high-temp strength
While 304L is chosen for weld-heavy applications to reduce the risk of sensitization, 304H is preferred for use in high-temperature environments where mechanical strength is critical.
Available Forms and Sizes
304H stainless steel plates are available in a variety of thicknesses, widths, and lengths. Custom sizes can also be produced to meet specific project requirements. Surface finishes can range from hot rolled, annealed, and pickled to polished finishes for aesthetic or functional needs.
Conclusion
Stainless Steel 304H Plates are a reliable and cost-effective solution for applications requiring strength, corrosion resistance, and high-temperature stability. Their versatile nature and superior properties make them indispensable in several critical industries. Whether for use in power plants, refineries, or heavy industrial machinery, SS 304H plates consistently deliver high performance and durability.
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