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As the global demand for LNG continues to surge, the integrity of storage and transportation infrastructure becomes paramount. X7Ni9 steel plate, commonly known as 9% Nickel steel, stands as the industry standard for ultra-low temperature applications. Designed specifically to maintain exceptional toughness at 196 degrees Celsius, this material is the backbone of modern cryogenic engineering.
X7Ni9 also known as 9% Nickel Steel or 1.5663 according to EN 10028-4 is a specialized low-carbon nickel alloy steel designed specifically for cryogenic applications, including the storage and transportation of LNG at temperatures down to -196°C. This high-strength steel is renowned for its excellent fracture toughness and ductility at ultra-low temperatures, preventing brittle failure in cryogenic pressure vessels.
Standard Compliance: EN 10028-4 (European), ASTM A553 / ASME SA553 Type I
Thickness Range: 6mm - 50mm
Width: 1,500mm - 4,000mm
Delivery Condition:Quenched and Tempered (QT). This heat treatment is critical to refining the grain structure and achieving the required cryogenic impact propertie.
Chemical Composition
Element
C (max)
Si (max)
Mn
P (max)
S (max)
Ni (Nickel)
Value
0.10
0.35
0.30 - 0.80
0.010
0.005
8.50 - 9.50
Mechanical Properties
Property
Value (Typical)
Remarks
Yield Strength (MPa)
≥ 585
High load-bearing capacity
Tensile Strength (MPa)
680 - 820
Structural integrity
Elongation (%)
≥ 18
Ductility for fabrication
Impact Energy (-196°C)
≥ 70 J
Charpy V-Notch Test (Critical)
Why X7Ni9 is the Standard for LNG Storage?
The choice of X7Ni9 over other materials like stainless steel or aluminum is driven by a unique balance of physics and economics:
Exceptional Brittle Fracture Resistance: Unlike carbon steel, which becomes brittle as temperatures drop, the 9% nickel content in X7Ni9 prevents crack propagation even at the boiling point of liquid nitrogen
Low Thermal Expansion: In large LNG tanks, thermal contraction during cooling can cause massive structural stress. X7Ni9 has a low coefficient of thermal expansion, ensuring dimensional stability
High Strength-to-Weight Ratio: The high yield strength allows for thinner tank walls compared to other cryogenic materials, reducing the overall weight of LNG carriers and the cost of onshore tanks
Superior Weldability: Despite its alloy content, X7Ni9 is engineered for excellent weldability using specialized nickel-based consumables, maintaining joint integrity at cryogenic temperatures
Why Choose GNEE for Your X7Ni9 Steel Supply?
As a leading global supplier of high-performance alloy steels, GNEE provides more than just raw materials; we provide project-ready solutions.
Class Society Certification: Our X7Ni9 plates are certified by major international bodies, including DNV, ABS, LR, and BV, specifically for marine and offshore cryogenic applications
Global Logistics Expertise: We understand the complexities of shipping large-format plates to LNG terminal sites in the Middle East, Southeast Asia, and beyond
Precision Processing: From laser cutting to beveling, we provide pre-processed plates that are ready for immediate welding upon arrival at the project site
Full Documentation: Every shipment is accompanied by a 3.1 or 3.2 MTC (Mill Test Certificate), detailing the -196°C impact test results and chemical heat analysis
Frequently Asked Questions
Can X7Ni9 steel be used for Liquid Hydrogen storage?
Generally, no. Liquid Hydrogen is stored at -253°C. While X7Ni9 is excellent for LNG (-162°C) and Liquid Nitrogen (-196°C), it reaches its safety limit at -196°C. For Liquid Hydrogen applications, austenitic stainless steels (like 304L) or specialized aluminum alloys are typically required to handle the even more extreme cold.
What is "Magnetic Arc Blow" and why is it a problem for 9% Ni steel?
9% nickel steel is highly susceptible to residual magnetism. During welding, this magnetism causes the electric arc to deflect , leading to weld defects, lack of fusion, or slag inclusions.
What makes X7Ni9 suitable for cryogenic environments?
X7Ni9 contains 9% nickel, which dramatically improves its low-temperature toughness and resistance to brittle fracture, even at the extreme -196°C temperatures of LNG operations.
What welding consumables are recommended for X7Ni9 plates?
X7Ni9 cannot be welded with matching 9% Ni fillers. Instead, Nickel-based alloys (such as Inconel-type consumables) or Hastelloy-type fillers are used. These fillers remain austenitic and provide excellent toughness at cryogenic temperatures, ensuring the weld joint is as strong and ductile as the base metal.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Trading Company
Year Established:
2008
Total Annual:
3000000-3500000
Employee Number:
100~200
Ecer Certification：
Verified Supplier
Gnee Steel Co.,Ltd (GNEE) is the affiliated company for ANGANG GROUP who are one large state-owned iron and steel group located in Henan, China.
GNEE are specialized in manufacturing and supplying large quantities Seamless steel pipes and Shipping-building plates, We are provide high quality steel ... Gnee Steel Co.,Ltd (GNEE) is the affiliated company for ANGANG GROUP who are one large state-owned iron and steel group located in Henan, China.
GNEE are specialized in manufacturing and supplying large quantities Seamless steel pipes and Shipping-building plates, We are provide high quality steel ...
