JISCO Mass Produces 347H Stainless Steel Plates for CSP Projects
China’s specialty stainless steel industry continues moving toward high-end applications. Jiuquan Iron and Steel Group (JISCO) has successfully achieved mass production of 347H stainless steel plates for concentrated solar power (CSP) molten salt storage tanks.
These plates are widely used in thermal energy storage systems. CSP molten salt tanks are considered the “energy storage heart” of solar thermal power plants.
The new production capability strengthens JISCO’s position in high-temperature stainless steel materials. It also supports global demand for long-life industrial energy storage systems.
Why 347H Stainless Steel Plates Are Important for CSP Plants
The global concentrated solar power market continues to expand. More projects require materials that can withstand extreme heat and long-term operation.
347H stainless steel plates belong to the niobium-stabilized austenitic stainless steel family.
The niobium element prevents chromium carbide formation at grain boundaries. This improves long-term structural stability under high temperature.
Key advantages include:
- Strong intergranular corrosion resistance
- Excellent creep resistance
- High-temperature strength stability
- Good weldability
- Long service life in thermal systems
The material performs reliably in temperatures from 800°F to 1500°F. It is especially suitable for molten salt storage systems operating above 500°C.
JISCO Produces Wide 347H Stainless Steel Plates for Industrial Tanks
JISCO used its 4200mm wide plate production line to manufacture CSP-grade materials.
The produced specification includes:
- Thickness: 8mm
- Width: 2600mm
Wider plates significantly reduce weld seams in large storage tanks.
This brings several advantages:
- Fewer welding joints
- Lower construction risk
- Faster installation
- Reduced maintenance cost
- Improved long-term reliability
The plates also maintain stable performance in extreme conditions ranging from -30°C to 560°C.
Strong Technical Capability Behind JISCO 347H Production
JISCO began developing 347H stainless steel plates in 2023. Since then, the product has been widely applied in CSP projects across China.
So far, more than 8,000 tons have been supplied to projects in regions such as Gansu, Qinghai, and Xinjiang.
The company also participated in the development of a national industry standard for stainless steel plates used in CSP molten salt tanks. The standard became effective in March 2026.
In addition, JISCO has filed multiple patents related to this product system.
Mechanical Performance of 347H Stainless Steel Plates
Testing results show strong mechanical properties and thermal stability.
At room temperature:
- Tensile strength: 608 MPa
- Yield strength: 265 MPa
- Elongation: 52%
At 593°C:
- Tensile strength: 385 MPa
- Yield strength: 146.5 MPa
The material fully complies with ASTM A240 standards.
Sulfur content is controlled below 0.001%, improving purity and stability.
Creep testing conducted with the University of Science and Technology Beijing confirms long-term reliability.
At 593°C, the material supports a design life of over 100,000 hours.
Growing Demand for Heat Resistant Stainless Steel
Global industries are increasing investments in renewable energy and high-temperature systems.
This is driving demand for heat resistant stainless steel materials used in:
- CSP molten salt tanks
- Pressure vessels
- Petrochemical reactors
- Industrial furnaces
- Thermal energy storage systems
Compared with standard stainless steel grades, 347H offers better long-term thermal stability and structural safety.
Global Supply of Stainless Steel Plates
As demand increases, buyers are focusing more on stable supply and reliable quality.
LYH Steel supplies stainless steel plates for high-temperature and industrial applications worldwide.
The company provides:
- ASTM A240 stainless steel plates
- Custom cutting services
- Export packaging solutions
- Third-party inspection support
- Industrial processing services
Explore more materials:
Conclusion
JISCO’s mass production of 347H stainless steel plates marks an important milestone in China’s high-end stainless steel industry.
The product supports CSP energy storage systems and other high-temperature industrial applications.
As global renewable energy projects expand, demand for advanced heat resistant stainless steel materials will continue to grow.
FAQ
What are 347H stainless steel plates used for?
They are mainly used in CSP molten salt tanks, pressure vessels, petrochemical equipment, and high-temperature industrial systems.
Why is 347H suitable for high-temperature applications?
It offers excellent creep resistance, corrosion resistance, and stable mechanical strength under long-term heat exposure.
What is the difference between 347 and 347H stainless steel?
347H contains higher carbon content, improving high-temperature strength and structural stability.
What standard do 347H plates follow?
They comply with ASTM A240 stainless steel plate standards.
Why are wider plates important for CSP tanks?
Wider plates reduce weld seams, lowering construction risk and improving tank durability.
What temperature can 347H stainless steel withstand?
It performs reliably from sub-zero conditions up to around 560°C in industrial applications.
Which industries use 347H stainless steel plates?
They are widely used in renewable energy, petrochemical, thermal power, and industrial furnace systems.