09MnNiDR boiler steel plate is ferrite and a small amount of pearlite type low temperature steel, which can be used to prepare -45 ~ -70℃ low temperature pressure vessel.
Mn and Ni are the main alloying elements in 09MnNiDR boiler steel plate. Mn can improve the strength of steel through solution strengthening, while Ni can improve the low temperature toughness of ferrite and obviously reduce the cold brittle transition temperature. At present, 09MnNiDR steel plate is mainly used in the manufacture of low temperature vessels for petroleum and chemical equipment.
(1) The results show that the heat input and interlayer temperature of 09MnNiDR boiler steel plate have influence on the impact absorption energy. The heat input of electrode arc welding should be within 15 KJ/cm, the heat input of submerged arc welding should be within 15 KJ/cm, and the interlayer temperature of 09MnNiDR boiler steel plate should not exceed 160℃.
(2) The impact energy absorbed by 09MnNiDR boiler steel plate is affected by post-weld heat treatment temperature, and the impact property of 590℃ heat treatment joint is better than 620℃.
(3) For the hot formed 09MnNiDR boiler steel plate, the hot forming temperature should be 910 ~ 960℃, the normalizing temperature should be 910℃, the final annealing temperature should be 590 ~ 620℃, and the best specification is 910℃ + 910℃ + 590℃.
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