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What material is 12MnNiVR? 12MnNiVR is a steel plate used for large oil storage tanks. The production technical specifications for 12MnNiVR steel plates are established on the basis of the GB19189 standard, in accordance with the design requirements for such steel plates put forward by relevant design institutes. The crack sensitivity coefficient Pcm, as specified in Japan’s JIS G3115 standard for SPV490Q, is lower in these specifications, which facilitates welding of the steel plates ； The sampling direction for the impact test was changed from longitudinal to transverse, the impact temperature was changed from -10 degrees to -15 degrees or lower, and the impact energy was increased. I. Chemical composition of 12MnNiVR (for cutting and shaping): Steel grade, P, %S, Akv at -20°C, J: 12MnNiVR – ≤0.025, ≤0.010, ≥47; WH610D2 – ≤0.020, ≤0.010, ≥80. II. Standards applicable to 12MnNiVR: 12MnNiVR steel plates are covered by the GB 19189 standard. To meet the requirements of user units, the technical specifications for WH610D2 in Wuhan Iron and Steel (Group) Company’s enterprise standard Q/WG(ZB)05-2005 have been improved. Table 5 specifies the requirements for phosphorus, sulfur content, and impact energy values of 12MnNiVR and WH610D2 steel plates. III. Mechanical properties of 12MnNiVR: Steel plate thickness/mm – Tensile test, Impact test, Bend test. Yield strength ReL/Mpa, Tensile strength Rm/Mpa, Elongation after fracture A/%, Temperature/℃, Impact energy absorbed KV2/J. For 180°b=2a: 10~60, ≥490; for 610~730: ≥17–20, ≥80. For d=3a: Remarks: When the yield phenomenon is not apparent, RP0.2 is used. IV. Application of 12MnNiVR: 12MnNiVR is primarily used in the construction of large-scale projects such as large oil storage tanks, large spherical tanks, and oil production platforms. V. Characteristics of 12MnNiVR: The high-strength quality of 12MnNiVR is achieved through the use of various new processes and technologies, such as multi-element micro-alloying, vacuum treatment of the molten steel, modification of inclusions, low-speed heavy rolling of the steel plate, as well as controlled rolling and controlled cooling. While ensuring that the steel possesses high purity, high strength, high toughness, and good weldability, appropriate quenching and tempering treatments are applied to the base material prior to welding, in order to meet the requirements of low sensitivity to welding cracks. Development of 12MnNiVR: Since Beijing Yanshan Petrochemical Company used WH610D2 steel plates produced by Wuhan Iron and Steel (Group) Corporation to manufacture 4 oil storage tanks with a capacity of 100,000 cubic meters in 1999, for various reasons, China still imports a large amount of steel plates for oil storage tanks from Japan.