Novel stainless steel submerged-arc welding wire for improving tensile strength after heat treatment

Abstract

The invention provides a novel stainless steel submerged-arc welding wire for improving tensile strength after heat treatment, belonging to the technical field of stainless steel welding wires for submerged-arc welding. The stainless steel welding wire provided by the invention comprises the following chemical components in percentage by weight: not more than 0.025 percent of C, not more than 0.60 percent of Si, 1.00-2.50 percent of Mn, not more than 0.02 percent of S, not more than 0.02 percent of P, 19.00-22.00 percent of Cr, 0.00-11.00 percent of Ni, not more than 0.50 percent of Mo, not more than 0.20 percent of Co, 0.07-0.20 percent of N and the balance of Fe. The welding wire benefits the solution to the technical problem that the tensile strength of the deposited metal, generated after tailor-welding heat treatment is carried out on a reactor end socket, is not in accordance to design requirements. The welding wire in the invention is mainly used for the tailor welding of end socket materials of an EPR (Electron Paramagnetic Resonance) nuclear power machine set and the welding of other materials.

Description

technical field [0001] The invention proposes a stainless steel submerged arc welding wire with improved tensile strength after heat treatment. The welding wire belongs to the field of stainless steel welding materials, and in particular relates to a stainless steel whose tensile strength can still meet the technical requirements of nuclear power products after high temperature heat treatment. Submerged arc welding wire. Background technique [0002] Many new requirements are put forward for welding technology in the manufacture of EPR nuclear power units. For example, the heads of large stainless steel vessels used in nuclear secondary equipment are made of Z2 CN 19-10 nitrogen-resistant stainless steel. Due to the insufficient size of the steel plate, tailor welding is required. The welding method is submerged arc welding. Tests have shown that the weakest part of this type of steel welded joint is the weld metal, that is, the deposited metal. Therefore, the present inven...

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Problems solved by technology

[0004] The comparative column welding wire welding test shows that the tensile strength of the deposited metal after heat treatment is 480MPa, which cannot meet the technical requirements for welding of the above-mentioned EPR nuclear power unit

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