12MnNiVR steel plate for pressure vessels

12MnNiVR is a steel plate used for pressure vessels, which has a lower crack sensitivity coefficient Pcm compared to the Japanese standard JIS G3115 SPV490Q, which is more conducive to steel plate welding; The sampling direction for impact testing has been changed from longitudinal to transverse, and the impact temperature has been changed from -10 degrees to -15 degrees or lower, with an increase in impact energy. 12MnNiVR steel plate is used for the manufacturing of large oil storage tanks.

Chemical composition of 12MnNiVR steel plate:
C≤0.15, Si: 0.15-0.40, Mn: 1.20-1.60, P≤0.018, S≤0.008, Ni: 0.15-0.40
Cr≤0.30, Mo≤0.30, V: 0.02-0.06, Ceq≤0.43, Pcm≤0.23, PsR＜0.00

The tensile and yield strength of 12MnNiVR pressure vessel steel plate:
Tensile strength Rm (N/mm2) 610-730
Yield point Rel (N/mm2) ≥ 490
Elongation A (%) ≥ 17
Yield strength ratio ≤ 0.91

Quenching and tempering heat treatment of 12MnNiVR steel plate:
Technical specifications for 12MnNiVR/12MnNiVR-SR steel plates/quenched and tempered high-strength steel plates for pressure vessels/steel plates for boilers and pressure vessels:
All steel plates need to be quenched and tempered, and the final tempering temperature of the 12MnNiVR SR steel plate should not be lower than 620.