P92 steel submerged arc welding wire

Abstract

The invention discloses a P92 steel submerged arc welding wire, which contains the following chemical components in percentage by mass: 0.06 to 0.08% of C, not less than 0.40% of Si, 0.4-1.0% of Mn, not less than 0.015% of P, not less than 0.015% of S, 9.0 to 10% of Cr, 0.3 to 0.6% of Mo, 0.15 to 0.25% of V, 1.5 to 2.0% of W, not less than 0.6% of Ni, 0.03 to 0.07% of Nb, 0.8 to 1.0% of Co, 0.001to 0.05% of B, 0.03 to 0.07% of N, and the balance of Fe. The welding wire is used in the submerged arc welding, on the premise of guaranteeing high temperature performance of a welding joint, the toughness of a weld seam is increased, and the application of a highly efficient welding method of the submerged arc in the boiler production is ensured.

Description

technical field [0001] The invention relates to a welding material for P92 steel, in particular to a welding material applied to a submerged arc welding process for P92 steel. Background technique [0002] P92 steel is a new type of martensitic heat-resistant steel obtained by adding a certain amount of tungsten element, appropriately reducing the content of molybdenum element, and adding trace boron element on the basis of P91 steel. It is widely used in the main steam pipe of ultra-supercritical boilers. , headers and other thick-walled pipes. As a mechanized welding method, submerged arc welding has the advantages of high production efficiency, high weld quality and good working conditions, and has significant technical and cost advantages in the manufacture of boiler components. However, the weld seam toughness of submerged arc welding is low, which affects the application of submerged arc welding, an efficient welding method, in boiler manufacturing. At present, most ...

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Problems solved by technology

However, the weld seam toughness of submerged arc welding is low, which affects the application of submerged arc welding, an efficient welding method, in boiler manufacturing.

At present, most P92 steel submerged arc welding wire adopts alloying design similar to P92 steel composition, and some nickel and manganese elements are added on the basis of P92 steel to improve weld toughness, but the effect is limited, and if the content of nickel and manganese elements is too high Assembly leads to Ac 1 The phase transition point is significantly reduced, which affects the implementation of the post-weld heat treatment process and adversely affects the high-temperature performance of the welded joint (Brühl.Verhalten des 9%-ChromstahlesX10CrMoVNb91 und seiner Schweiβverbindungen im Kurz-undLangzeitversuch.Dissertation, Graz 1989)

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