Product Description: X7Ni9 (1.5662) / A353 Sheet Steel
X7Ni9 (1.5662) sheet steel and its American equivalent A353 belong to high-quality nickel steels containing approximately 9% nickel, designed for operation at extremely low and cryogenic temperatures. The material is widely used in the production of equipment for storage and transportation of liquefied gases.
General Technical Characteristics
X7Ni9 steel is characterized by high strength, excellent impact toughness, and resistance to brittle fracture at temperatures down to -196°C. It maintains its mechanical properties even under extreme cold conditions, making it indispensable for cryogenic applications.
Key properties:
- high strength
- exceptional impact toughness
- resistance to cryogenic temperatures
- good weldability
Chemical Composition
The composition is optimized for low-temperature performance:
- Carbon (C): up to 0.10%
- Manganese (Mn): up to 0.9%
- Silicon (Si): up to 0.35%
- Nickel (Ni): 8.5–9.5%
- Sulfur (S) and Phosphorus (P): minimal content
The high nickel content ensures excellent toughness and resistance to fracture.
Mechanical Properties
X7Ni9 / A353 steel typically demonstrates:
- yield strength: approximately 490–620 MPa
- high impact toughness at temperatures down to -196°C
- resistance to deformation
- high reliability in cryogenic conditions
Applications
X7Ni9 sheet steel is widely used for:
- LNG storage tanks (liquefied natural gas)
- cryogenic vessels
- heat exchange equipment
- gas storage and transportation systems
It is commonly applied in energy, gas, and chemical industries.
Features
Key advantages include:
- performance at extremely low temperatures
- high strength and reliability
- resistance to cryogenic fracture
- excellent manufacturability and weldability
Supply Formats and Standards
The steel is supplied in sheet form:
- hot-rolled sheets
- various thicknesses and sizes available
The material complies with:
- EN 10028-4 (1.5662 / X7Ni9)
- ASTM A353
X7Ni9 (1.5662) sheet steel is an optimal choice for cryogenic systems and equipment where strength, reliability, and resistance to extremely low temperatures are critical.
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