Special Steel for Cryogenic Pressure Vessels: Detailed Introduction to 07Ni5DR Steel Plates
I. Basic Information
07Ni5DR steel plate is a high-performance steel plate for low-temperature vessels, featuring high strength, high toughness and excellent low-temperature impact performance.
It is mainly used in manufacturing storage tanks for storing and transporting liquefied natural gas (LNG) as well as ultra-low temperature vessels for LNG ships. Meanwhile, it is also widely applied in the petroleum, chemical, pharmaceutical, food and other industries for manufacturing low-temperature pressure vessels.
Meaning of the grade:
"07" indicates that the carbon (C) content is ≤ 0.07%;
"Ni5" indicates that the average content of nickel (Ni) is 4.75% - 5.25%;
"DR" is the abbreviation of "cryogenic vessel".
II.Chemical Composition
Main elements:
- Nickel (Ni): 4.75% - 5.25% (core alloying element);
- Carbon (C): ≤ 0.10%;
- Silicon (Si): 0.10% - 0.35%;
- Manganese (Mn): 0.30% - 0.80%;
Other alloying elements include chromium (Cr), copper (Cu), molybdenum (Mo), vanadium (V), niobium (Nb), etc., all of which are controlled at relatively low levels.
III. Performance Characteristics
Cryogenic Performance:
The minimum service temperature can reach -120°C, maintaining good impact toughness and mechanical properties.
Implements the standard GB/T 713.4-2023 (effective from March 2024).
Mechanical Properties:
Tensile strength: 530~700MPa;
Yield strength: ≥370MPa for thickness 5~30mm, ≥360MPa for 30~50mm, ≥350MPa for 50~80mm;
Elongation: ≥20%.
Other Characteristics:
Excellent weldability and corrosion resistance (resistant to acids, alkalis, etc.);
Superior thermal conductivity, helping to maintain stable temperature inside the vessel.
IV. Application Fields
LNG storage tanks, ultra-low temperature vessels for LNG ships;
Cryogenic equipment in chemical, petroleum, marine engineering, nuclear energy and other industries (such as CO₂ absorption towers, methanol washing towers).
V. Delivery Status
Usually delivered in the state of offline quenching + tempering (quenched and tempered). For plates with thickness ≤12mm, the process of double normalizing + tempering can be adopted, with the tempering temperature not lower than 540°C.
ABOUT US
The production department of GNEE currently has 150 employees, including 2 senior engineers, 17 engineers, and 10 assistant engineers. The company covers an area of 80,000 square meters, with a production area of 20,000 square meters, and an annual production capacity of 30,000 tons of pressure vessels. With excellent product quality and services, we have established more than 300 long-term cooperative customers in China, and have provided products to overseas customers through design institutions. Up to now, we have produced more than 50,000 various types of pressure vessels.
If you want to know about certain products, you can send an email to alloy@gneesteelgroup.com
