Submerged-arc welding flux suitable for Q550qENH steel, preparation method and deposited metal

By designing a submerged arc welding flux suitable for Q550qENH steel, the performance problems of Q550qENH steel welded joints under high temperature, high pressure and corrosive media conditions are solved, and the high strength, high toughness and good corrosion resistance of the welded joints are achieved.

CN119973463AActive Publication Date: 2025-05-13ATLANTIC CHINA WELDING CONSUMABLES
View PDF 5 Cites 0 Cited by

Patent Information

Application Number
CN202411977526.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-31
Publication Date
2025-05-13
Estimated Expiration
2044-12-31

AI Technical Summary

Technical Problem

How to ensure that the performance of Q550qENH steel welded joints is the same as that of the base material under high temperature, high pressure and various corrosive media conditions, and has good tensile strength, impact toughness and corrosion resistance.

Method used

A submerged arc welding flux suitable for Q550qENH steel is provided, and its chemical compositions include SiO2, MgO, Al2O3, ΣCaO, MnO, Na2O, K2O, TiO2, Fe2O3, S, P and LiF. By precisely controlling the content of each component and baking conditions, a flux with excellent welding performance is prepared.

Benefits of technology

The good formability, mechanical properties and process performance of the welds are achieved, ensuring that the tensile strength, cross-section shrinkage and impact work of the welded joints meet the standards of 700Mpa~760Mpa, 55%~62% and ≥100J, and meets the high strength and high toughness requirements of Q550qENH steel.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN119973463A_ABST
    Figure CN119973463A_ABST
Patent Text Reader

Abstract

The invention provides a submerged-arc welding flux suitable for Q550qENH steel, a preparation method and deposited metal, and belongs to the field of flux. The submerged-arc welding flux comprises the following chemical components: 1-5 parts of SiO2, 10-18 parts of MgO, 30-40 parts of Al2O3, 40-45 parts of sigma CaO, 0.5-3 parts of MnO, 0.5-1 part of Na2O, 0.5-1 part of K2O, 0.5-3 parts of TiO2, less than or equal to 1.0 part of Fe2O3, less than or equal to 0.020 part of S, less than or equal to 0.020 part of P and less than or equal to 5 parts of LiF. The chemical components of the submerged-arc welding flux are reasonably designed and matched with a special welding wire, so that the chemical components and the structure of weld metal can be optimal, good and reasonable mechanical performance indexes such as tensile strength, impact value, bending performance, crack resistance and hardness are achieved under the welding state condition, no air hole, no slag inclusion and no crack exist in a weld, and the welding quality is improved. And the low-temperature impact toughness at-40 DEG C is 100 J or above, and the standard requirements of Q550qENH steel are completely met.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Special submerged-arc welding flux resistant to marine atmospheric corrosion

    CN107175429A

  • Ultralow diffusible hydrogen sintered flux used for welding low-temperature steel and preparation and application

    CN108581273A

  • Bridge 800 MPa weather-proof high-strength steel matched welding flux and preparation method thereof

    CN109530976A

  • Gas shielded welding wire matched with weather-resistant bridge steel Q690qE and preparation method thereof

    CN110549033A

  • Submerged arc welding FLUX containing filler metal in the form of iron powder

    GB1273825A