CN-121972858-A - Titanium type flux-cored wire for ocean atmospheric corrosion resistant bridge steel

Abstract

The invention discloses a titanium type flux-cored wire for ocean atmospheric corrosion resistant bridge steel, which comprises a carbon steel sheath and medicinal powder filled in the carbon steel sheath, wherein the medicinal powder comprises nonmetal powder and metal powder; the nonmetal powder comprises the following components in parts by weight: 380-400 parts of titanium dioxide, 20-50 parts of potassium silicon titanate, 10-20 parts of potassium fluosilicate, 10-20 parts of sodium fluoaluminate, 10-20 parts of zircon sand and 10-20 parts of rare earth fluoride; the invention establishes the formula of the titanium type flux-cored wire for the marine atmospheric corrosion resistant Q345 qDNHY-1 bridge steel, and has excellent comprehensive mechanical property and corrosion resistance when the formula meets the requirement of a novel marine climate resistant steel Q345 qDNHY-1 welding joint matched with a welding wire.

Inventors

• ZHANG JIAN
• BAI YINGHUA
• XIA RUIQI
• HE ZHENGWEI
• MA QIANG

Assignees

• 天津市金桥焊材集团股份有限公司
• 天津市永昌焊丝有限公司

Dates

Publication Date

20260505

Application Date

20260318

Claims (8)

1. 1. A titanium type flux-cored wire for ocean atmospheric corrosion resistant bridge steel comprises a carbon steel sheath and medicinal powder filled in the carbon steel sheath, and is characterized in that the medicinal powder comprises nonmetal powder and metal powder; The nonmetallic powder comprises, by weight, 380-400 parts of titanium dioxide, 20-50 parts of potassium titanate, 10-20 parts of potassium fluosilicate, 10-20 parts of sodium fluoaluminate, 10-20 parts of zircon sand and 10-20 parts of rare earth fluoride; the metal powder comprises, by weight, 100-120 parts of nickel powder, 15-20 parts of ferromolybdenum, 25-30 parts of copper powder, 10-30 parts of electrolytic manganese, 100-140 parts of silicomanganese alloy, 40-60 parts of magnesium powder, 10-20 parts of ferrotitanium and 150-200 parts of iron powder.
2. 2. The titanium-type flux-cored wire for ocean atmospheric corrosion-resistant bridge steel of claim 1, wherein the flux-cored wire has a powder filling rate of 14% -16%.
3. 3. The titanium-type flux-cored wire for ocean atmospheric corrosion-resistant bridge steel of claim 1, wherein the diameter of the flux-cored wire is 1.2mm.
4. 4. The titanium-type flux-cored wire for ocean atmospheric corrosion resistant bridge steel, which is characterized in that the composition of the flux-cored wire deposited metal meets the following relational expression that 0.6 is less than or equal to 10 MoMo/(NiNi + CuCu) is less than or equal to 1.0, wherein MoMo, niNi, cuCu represents the mass percentage of Mo, ni and Cu in the deposited metal respectively.
5. 5. The titanium-type flux-cored wire for ocean atmospheric corrosion resistant bridge steel of claim 1, wherein the flux-cored wire is used for welding Q345qDNHY-1 bridge steel to form a welding joint, and the weather-resistant alloy index V of the welding joint is more than or equal to 1.3 and less than or equal to 1.4; The weather resistant alloy index V=1/｛（1.0-0.16［C］）×（1.05-0.05［Si］）×（1.04-0.016［Mn］）×（1.0-0.5［P］）×（1.0+1.9［S］）×（1.0-0.10［Cu］）×（1.0-0.12［Ni］）×（1.0-0.3［Mo］）×（1.0-1.7［Ti］）｝; where [ C ], [ Si ], [ Mn ], [ P ], [ S ], [ Cu ], [ Ni ], [ Mo ] and [ Ti ] represent the deposited metal content percentages of C, si, mn, P, S, cu, ni, mo and Ti, respectively.
6. 6. The titanium-type flux-cored wire for ocean atmospheric corrosion-resistant bridge steel, which is characterized in that the tensile strength of deposited metal of the flux-cored wire is not less than 510MPa, the yield strength is not less than 400MPa, the elongation is not less than 22%, and the impact toughness at-20 ℃ is not less than 80J.
7. 7. The titanium-type flux-cored wire for marine atmospheric corrosion-resistant bridge steel of claim 1, wherein the flux-cored wire is used for welding Q345qDNHY-1 bridge steel to form a welded joint which meets the requirement that the potential difference between a welding line and a base metal is equal to or less than 5mV and equal to or less than 30mV.
8. 8. The titanium-type flux-cored wire for marine atmospheric corrosion resistant bridge steel of claim 1, wherein the flux-cored wire is used for welding a welding joint formed by Q345qDNHY-1 bridge steel, and the thinning ratio beta of a welding seam to a base metal is less than 1.33.

Description

Titanium type flux-cored wire for ocean atmospheric corrosion resistant bridge steel Technical Field The invention belongs to the technical field of welding materials, and particularly relates to a titanium type flux-cored wire for ocean atmospheric corrosion resistant bridge steel. Background With the rapid promotion of the construction of the infrastructure of China and the continuous deepening of the urban process, the steel structure bridge is taken as a key component part of the modern traffic engineering, and is in an important opportunity period for transformation and upgrading. From the early simple steel girder structure to the current large-span intelligent bridge system, the steel structure bridge has wide application in highway, railway and municipal engineering by virtue of the advantages of light dead weight, high strength, short construction period, strong recoverability and the like. Because the steel has high strength, light dead weight and good plasticity and toughness, the large-span bridge crossing the large river and the deep mountain canyon adopts a steel bridge. However, steel bridges made of ordinary steel have the disadvantage of being prone to rust. In order to ensure the long-term use safety of the steel bridge within the design period, the corrosion prevention of the steel bridge is very important. Corrosion problems are important issues affecting the long-term use safety performance of steel bridges. Along with the development of the construction of the traffic infrastructure in China, the construction of the large-span steel structure bridge is dramatically increased, and the corrosion prevention problem of the bridge steel structure is further emphasized. Along with the high-quality development of economic construction in China, green and long-life assumptions are provided for the corrosion resistance of the cross-sea bridge. From the material aspect, developing a bridge steel which is difficult to rust and can avoid coating bridge construction in a proper environment greatly reduces the whole life cost. The atmospheric corrosion is most serious in the ocean, and brings a certain obstruction to the development of China to the ocean field, because the ocean atmospheric environment has the characteristics of high humidity, heat and salt content, the environmental factors are more severe, and the requirements on the corrosion resistance of bridge steel are more strict. Therefore, the method has great significance for developing the high-humidity heat weather-resistant bridge steel. The novel marine climate resistant steel Q345qDNHY-1 is a new generation of weather resistant steel plate specially developed for coastal high-salt fog and high-humidity hot environments in China, has excellent marine atmospheric corrosion resistance, and can remarkably prolong the service life of steel structure facilities in severe marine environments. As a green environment-friendly material, the steel has outstanding advantages in the aspects of reducing coating dependence, reducing maintenance cost of a full life cycle and the like. In the marine atmospheric environment with high humidity and high salinity, compared with the ordinary carbon steel, the novel marine climate resistant steel has 5-10 times of corrosion resistance. At present, the research on the welding performance, the corrosion resistance of the welding joint and the welding process of the novel weathering steel is less, and the related engineering practice experience is lacking. Disclosure of Invention In view of the above, the invention aims to provide a titanium type flux-cored wire for ocean atmospheric corrosion resistant bridge steel, which aims to solve at least one technical problem in the background art. In order to achieve the above purpose, the technical scheme of the invention is realized as follows: A titanium type flux-cored wire for marine atmospheric corrosion resistant Q345qDNHY-1 bridge steel, which is matched with novel marine climate resistant steel Q345qDNHY-1 welded joint, has excellent comprehensive mechanical property and corrosion resistance. The matched Q345qDNHY-1 bridge steel solves the mechanical property and corrosion property of the welded joint. The flux-cored wire comprises a carbon steel sheath and medicinal powder filled in the sheath, wherein the medicinal powder comprises nonmetal medicinal powder and metal medicinal powder. According to the invention, a Ni-Mo-Cu alloy system is creatively and optimally adopted for the metal powder components used in the flux-cored wire formula, so that the titanium-type flux-cored wire formula for the marine atmospheric corrosion resistant Q345qDNHY-1 bridge steel is established, and the titanium-type flux-cored wire formula has excellent comprehensive mechanical properties and corrosion resistance in the aspect of meeting the requirement of a novel marine climate resistant steel Q345qDNHY-1 welding joint matched with a welding wire. The invention provides a tit