Welding method to prevent block ferrite from thermal influence in weld seam of sa335-t/p92 steel

A SA335-T, massive ferrite technology, applied in welding equipment, welding/welding/cutting items, arc welding equipment, etc., can solve the problem that P91 cannot meet the requirements of long-term safe operation, hidden dangers of power station safe operation, high cost, etc. problems, achieve the effect of reducing stress corrosion sensitivity, eliminating welding residual stress, and improving economy

Active Publication Date: 2019-09-24
SUZHOU NUCLEAR POWER RES INST +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the early 1990s, on the basis of extensive promotion of SA335-P91 steel, Japan found that when the operating temperature exceeds 600 °C, P91 can no longer meet the requirements for long-term safe operation.
However, this method has a long cycle and high cost, and the long-term use of T / P92 steel high-temperature and high-pressure equipment with low high-temperature performance will bring major hidden dangers to the safe operation of the power station.

Method used

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  • Welding method to prevent block ferrite from thermal influence in weld seam of sa335-t/p92 steel
  • Welding method to prevent block ferrite from thermal influence in weld seam of sa335-t/p92 steel
  • Welding method to prevent block ferrite from thermal influence in weld seam of sa335-t/p92 steel

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Effect test

Embodiment 1

[0027] The present embodiment provides a kind of welding method that prevents SA335-T / P92 steel weld seam from heat-affected massive ferrite to produce, and it comprises the following steps:

[0028] (a) The material is T / P92 steel (specification ) and Super304H (Specification Process it into a wall thickness of 6.8mm before welding) Make grooves between the end faces of dissimilar steels;

[0029] (b) Carry out argon arc welding without preheating of the root layer, and then weld layer by layer until the weld is formed; welding parameters are shown in Table 1;

[0030] Welding parameters in table 1 embodiment 1

[0031] Process content Parameter requirements Groove V-shaped groove, the groove angle is 50° on one side pre-heat temperature no warm-up Welding current 160A arc voltage 16V interlayer temperature 150～200℃ welding speed 60~80mm / min Protective gas pure argon shielding gas flow 10-20L / min

[003...

Embodiment 2

[0034] This embodiment provides a welding method for preventing the SA335-T / P92 steel weld seam from being affected by the blocky ferrite produced by heat. Its specific operation steps and operating parameters are consistent with those in Embodiment 1. The difference is that the material is T / P92 steel (specification ) and HR3C (Specification Process it into a wall thickness of 6.8mm before welding) for welding; the metallographic structure of the heat-affected zone on the T / P92 side of the final welded product is as follows image 3 shown.

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Abstract

The invention relates to a melding method for preventing the generation of granular ferrite in an SA335-T / P92 steel weld heat affected zone. The method comprises the following steps: (a) fabricating a groove between to-be-welded SA335-T / P92 steel end faces or between the to-be-welded SA335-T / P92 steel end faces and dissimilar steel, (b) performing non-preheating argon arc welding on a root bottom layer, and then performing welding layer by layer until a seam is formed, wherein the welding current is 130-160A, the arc voltage is 15-17V, and the interlayer temperature is 150-200 DEG C; and performing heat treatment after cooling. Therefore, the granular ferrite is not generated in the T / P92 steel weld heat affected zone; and moreover, the tissues can be improved, the plasticity of the seam is improved, the oxygen can escape, the residual welding stress is eliminated, the stress corrosion susceptibility is reduced, and the heat affected zone is softened.

Description

technical field [0001] The invention belongs to the technical field of welding, and relates to a welding method for preventing the generation of blocky ferrite affected by the heat of weld seams of SA335-T / P92 steel. Background technique [0002] In the early 1990s, on the basis of extensive promotion of SA335-P91 steel, Japan found that when the service temperature exceeds 600 °C, P91 can no longer meet the requirements for long-term safe operation. On the basis of P91, Japan developed T / P92 steel through the following improvements: by adding 1.5% to 2.0% W on the basis of P91 steel, the Mo content was reduced to adjust the balance between ferrite and austenite elements . [0003] T / P92 is mainly used to replace stainless steel in superheaters and reheaters in power plant boilers, as well as headers and steam pipes under extremely severe steam conditions. T / P92 has stronger high temperature strength and creep properties than other ferritic alloy steels. Its corrosion res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/235B23K9/095B23K9/16B23K103/04
Inventor 薛建强成鹏王志刚尹少华金敏华尚建路薛军王淦刚
Owner SUZHOU NUCLEAR POWER RES INST
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