What kind of steel is 07mnnivdr, 07mnivdr material steel plate fixed rolling, 07mnivdr chemical comp

What kind of steel is 07mnnivdr, 07mnivdr material steel plate fixed rolling, 07mnivdr chemical comp

07MnNiVDR is a low welding crack susceptibility steel, 07MnNiVDR is also called a cryogenic container plate, using electric furnace steelmaking, made of scrap iron steel, 07MnNiVDR This requirement is applicable to the thickness of 10mm-60mm pressure vessel with quenched and tempered high-strength steel plate

steel plate rolling: Wugang Xiangyang

07MnNiVDR steel plate implementation standard is: GB/ 19189 special technical conditions.

The chemical composition

of 07MnNiVDR steel plate 07MnNiVDR steel plate is made of scrap steel, the overall steel quality is pure, there are few impurities, and the sulfur and phosphorus content is low;

1. The carbon (C) element content of 07MnNiVDR steel plate is less than or equal to 0.09;

2. The silicon (Si) element content of 07MnNiVDR steel plate is between 0.15 and 0.40;

3. The manganese (Mn) content of 07MnNiVDR steel plate is between 1.20 and 1.60,

4. The sulfur (S) content of 07MnNiVDR steel plate is less than or equal to 0.008, 5

. The phosphorus (P) content of 07MnNiVDR steel plate is less than or equal to 0.018.

The overall heat treatment of spherical tank is an effective measure to improve the performance of welded joints, eliminate residual stress and residual hydrogen, and improve the operation reliability of spherical tank according to factors such as group deformation, welding residual stress, weld residual hydrogen and joint hardening tendency in the process of manufacturing and installation.

Due to the inherent characteristics of 07MnNiCrMo VDR mesh in heat treatment, the domestic academic community has different opinions on whether the overall heat treatment is required in the 1500m ethylene spherical tank made of 7MnNiCrMoV DR steel, but foreign standards are examined; For example, the first and second parts of ASME in the United States, JISB8243-1981 and other standards in Japan, there are provisions on heat treatment when the thickness of the shell plate is greater than 38mm, and the thickness of carbon steel and low-alloy steel that needs to be heat treated in China's current pressure vessel technical standards is lower than 38mm, etc., and the overall heat treatment has been carried out in China's first large-scale ethylene spherical tank (1500m3 ethylene spherical tank of Daqing Petrochemical General Plant).

The use of Daqing ethylene spherical tank and the results of the opening inspection prove that the overall heat treatment is reliable. Due to the relatively mature overall heat treatment technology of spherical tanks in China, the overall heat treatment is required for 2 sets of Lanzhou Chemical Engineering Company and 4 sets of ethylene spherical tanks of Dongfang Chemical Plant built with 07MnNiCrMoVDR material.