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9% Nickel Alloy Steel Plate For LNG & Cryogenic
BRAND: PROMISTEEL
GRADES: ASTM A553 Type I, ASME SA553, EN 10028 X8Ni9
SHAPES: Wide & Heavy Plate, Ultra-thin Plate (Coil)
THICKNESS: 5 mm - 100mm (Rare 5 mm Supply Capability)
WIDTH: 1500mm - 4800mm
IMPACT TEST: -196°C (Liquid Nitrogen Temp)
FEATURE: Excellent Crack Arrest Properties, Zero Brittle Fracture
APPLICATION: LNG Storage Tanks, LNG Ships, Cryogenic Vessels
MOQ: Project Based / 10 Tons
9% Nickel Alloy Steel is the ultimate material for safety in the cryogenic world. Designed to operate at temperatures as low as -196°C, it is the primary structural material for Liquefied Natural Gas (LNG) storage tanks and carriers. Standard carbon steel becomes brittle like glass at these temperatures, but 9% nickel steel maintains exceptional toughness and ductility, preventing catastrophic fractures.
Promisteel is one of the few suppliers globally capable of providing the full range of 9Ni steel specifications, including the highly specialized 5mm Ultra-Thin 9% Ni Steel Plate. Leveraging our premium supply chain partners and advanced heat treatment capabilities, we offer plates that meet the most stringent "Crack Arrest" requirements for next-generation mega-scale LNG tanks.
Product Specifications & Grade Equivalents
Our material is certified by major classification societies (CCS, DNV, ABS) for marine and onshore applications.
Table-1
Our material is certified by major classification societies (CCS, DNV, ABS) for marine and onshore applications.
International Grade Comparison |
||||
| ASTM / ASME (USA) | EN 10028 (Europe) | GB (China) | JIS (Japan) | Application |
| A553 Type I | X8Ni9 (1.5662) | 06Ni9DR | SL9N590 |
LNG Tanks (-165°C) |
| A553 Type II | X7Ni9 | - | - | Lower Ni (8%) |
| A645 | X12Ni5 (1.5680) | 06Ni5DR | SL5N590 |
LEG Tanks (-100°C) |
Table-2
Precise nickel content guarantees cryogenic phase stability.
Chemical Composition (Mass Fraction %) |
||||||
| Grade | C | Ni | Mn | P | S | Si |
| A553 Type I | ≤0.13 | 8.50~9.50 | ≤0.90 | ≤0.035 | ≤0.035 | 0.15~0.40 |
| X8Ni9 | ≤0.10 | 8.50~10.0 | 0.30~0.80 | ≤0.020 | ≤0.005 | ≤0.35 |
Table-3
Featuring the rare capability to supply 5 mm plates for lightweight inner shells.
Supply Range & Formats |
||||
| Product Form | Thickness (mm) | Width (mm) | Length (mm) |
Delivery Condition |
| Ultra-Thin Plate | 5.0 - 8.0 | 1500 - 3000 | 6000 - 12000 | QT / N+N |
| Heavy Plate | 8.0 - 100 | 2000 - 4800 | Custom |
Quenched & Tempered (QT) |
Key Features
5mm Ultra-Thin Capability
Traditionally, 9Ni steel was limited to thicker plates. We have successfully integrated the supply chain to offer 5mm thickness plates with superior flatness. This allows tank designers to optimize the upper courses of the tank shell, reducing weight and welding costs for large storage projects.
Crack Arrest Properties
Safety is paramount. Our supplied plates pass the rigorous Crack Arrest Test at -165°C, ensuring that even if a micro-crack initiates, it will not propagate into a catastrophic failure.
High Purity Melting
Produced using advanced refining to minimize impurities (P, S), ensuring the steel remains ductile even at liquid nitrogen temperatures.
High Strength
With a Yield Strength >585 MPa and Tensile Strength >680 MPa, 9Ni steel offers a high strength-to-weight ratio, reducing the total steel tonnage required for tank construction.
Typical Applications
LNG Storage Tanks
Inner shells of onshore LNG terminals (160,000m³ to 270,000m³ capacity).
LNG Carriers & Ships
Fuel tanks for LNG-powered vessels and cargo tanks for gas carriers.
Cryogenic Vessels
Storage and transport equipment for Liquid Nitrogen (LIN), Liquid Oxygen (LOX), and Liquid Argon (LAR).
Offshore Platforms
FLNG (Floating Liquefied Natural Gas) processing units.
FAQ
Q1: Why is 9% nickel used for LNG instead of stainless steel?
A1: Cost & Strength. While 304 Stainless Steel also works at -165°C, 9% Nickel Steel is significantly stronger (almost double the yield strength). This allows engineers to use thinner plates, reducing the overall weight and cost of massive storage tanks.
Q2: What is the significance of the 5 mm thickness?
A2: Producing 5 mm 9Ni steel is extremely difficult due to shape control issues during quenching. Our unique supply capability for 5 mm plates allows for more efficient tank designs, specifically for the top layers of the inner shell where pressure is lower but weight saving is critical.
Q3: Is 9% Nickel Steel magnetic?
A3: Yes. Unlike Austenitic Stainless Steel (304), 9% Nickel Steel has a ferritic/martensitic structure and is ferromagnetic. This allows for the use of magnetic lifting cranes during construction.
Q4: How do you weld 9% Nickel Steel?
A4: It requires specialized nickel-based welding consumables (like Inconel type). Because the steel is magnetic but the weld metal is non-magnetic, "Arc Blow" can be an issue, so AC welding is often preferred. We can recommend matching welding consumables.
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