9Ni steel plate is mainly used in the manufacture of liquefied natural gas (LNG) storage tanks and transport ships, the minimum use temperature can reach -196℃, its high strength, low temperature toughness, good welding performance, is the best toughness of Marine steel plate used in the cryogenic environment.

ASME SA-353 is a steel specification in the American Society of Mechanical Engineers (ASME) standard for the manufacture of ships and pressure vessels. Specifically, the ASME SA-353 code covers the requirements for 9% nickel steel (9Ni steel).

9Ni steel plate is a kind of steel with high strength, toughness and excellent corrosion resistance, and has good toughness and crack resistance in low temperature environment. It is commonly used in the manufacture of liquefied natural gas (LNG) storage tanks, Marine steam condensers, pressure vessels and other applications to meet high strength requirements at low temperatures.

ASME SA-353 standard specifies the chemical composition, mechanical properties, impact toughness, hardness, heat treatment and other aspects of 9% nickel steel.

9Ni steel plate national standard

9Ni steel plate chemical composition design standards are shown in the table:

Effect of alloying elements on 9Ni steel plate

C -- carbide precipitation will cause pitting, generally controlled at <0.08%;

Mn- austenitic phase stabilization element, improve wear resistance and nitrogen solid capacity;

Si-- helps to resist high temperature oxidation and acid corrosion;

Ni- Stabilizes the element, reduces brittleness and improves mechanical properties, enhancing acid resistance.

9Ni steel plates can issue naturalization inspection reports of classification societies such as CCS, ABS, DNV, LR, NK, BV, KR, etc.

9Ni steel plate has a number of applications in ship construction, mainly including the following aspects:

1. Hull structure: 9Ni steel plate can be used for the structural components of the hull, such as the shell plate, deck, bulkhead, etc. Due to the high strength and good toughness of 9% nickel steel, it can provide good structural strength and seismic performance.

2. Storage tanks and cargo holds: 9Ni steel plate has excellent corrosion resistance and can resist corrosion and oxidation in the Marine environment. Therefore, it is often used in the internal structure of storage tanks and cargo holds on ships, such as liquefied natural gas (LNG) storage tanks, oil tanks and chemical storage tanks.

3. Ship pipeline system: 9Ni steel plate can also be used for the construction of ship pipeline systems, such as liquid and gas transmission pipelines, heating systems and cooling systems. Due to its corrosion resistance and good low temperature performance, 9Ni steel ensures the safe operation of pipeline systems in harsh Marine environments and low temperature conditions.

4. Marine equipment and components: 9Ni steel plates can also be used to manufacture various equipment and components on ships, such as support structures for Marine engines, propellers and supports for propulsion devices. By using 9Ni steel, these equipment and components can have high strength and good durability.

It is important to note that in ship construction, the requirements and specifications for material properties in each application field may vary. Therefore, when selecting and using 9Ni steel plates, it is necessary to follow the requirements of relevant classification societies (such as classification society specifications) and international standards (such as ASME, etc.), and carry out reasonable design and treatment to ensure the safety and reliability of the ship.