GB 3531 low temperature boiler quality 09MnNiDR pressure vessel steel plate

09MnNiDR steel is low-temperature pressure vessle steel. Since nickel (Ni) is added to the steel, GB 3531 low temperature boiler quality 09MnNiDR pressure vessel steel plate can maintain a relatively high mechanical strength and toughness under ultra-low temperature conditions. And 09MnNiDR steel is mainly used for low temperature pressure vessels.

Mn and Ni are its main alloys. Mn mainly enhances the strength of GB 3531 low temperature boiler quality 09MnNiDR pressure vessel steel plate by solid solution strengthening, while Ni can improve the low temperature toughness of ferrite and has the effect of significantly reducing the temperature of cold and crisp transitions. Its carbon equivalent is less than or equal to 0.44, hardenability tends to be small, and cold cracks are not easily formed. The weld has good plasticity and toughness, and usually does not require preheating. When the GB 3531 low temperature boiler quality 09MnNiDR pressure vessel steel plate thickness exceeds a certain thickness, the rigidity of the joint is restricted, or the carbon equivalent is high, preheating should be considered.