一种800MPa级中厚板高强钢用药芯焊丝及应用

By adjusting the composition of the flux-cored welding wire and the welding parameters, the problem of insufficient low-temperature impact performance in the existing technology was solved, achieving high strength and low-temperature toughness of 800MPa grade low alloy high-strength steel plates, meeting the low-temperature impact requirements of -60℃, and the welded joint has excellent cold crack resistance.

CN117206740BActive Publication Date: 2026-07-17WUHAN MARINE MACHINERY PLANT
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WUHAN MARINE MACHINERY PLANT
Filing Date
2023-08-03
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

There is a lack of flux-cored welding wires for 800MPa grade low alloy high-strength steel plate Q690 that can meet the low-temperature impact requirement of -60℃, and existing welding wires are difficult to meet the high requirements of engineering machinery and marine equipment in terms of cold crack resistance and comprehensive mechanical properties.

Method used

The welding wire is composed of a specific ratio of flux-cored wire, including rutile, calcium titanate, calcium fluoride, feldspar, magnesium powder, ferrosilicon, high-carbon ferromanganese, metallic manganese, metallic zirconium, nickel powder, and molybdenum powder. By adjusting the contents of C, Si, Mn, Ni, Mo, and Zr, a TiO2-CaO titanium-calcium type slag system is formed to ensure that the weld metal has good low-temperature impact toughness and cold crack resistance at -60℃.

Benefits of technology

The weld metal achieved an impact toughness of over 80J at -60℃ and a diffusible hydrogen content of less than 5.0mL/100g. The welded joint has excellent comprehensive mechanical properties, meeting the high strength requirements of engineering machinery and marine equipment.

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Abstract

一种800MPa级中厚板高强钢用药芯焊丝，包括碳钢外皮、重量占药芯焊丝总重量的15%‑16%的药芯，药芯的原料组成及其重量百分比含量为：金红石16%‑18%、钛酸钙20%‑24%、氟化钙4%‑7%、长石3%‑6%、镁粉4%‑7%、硅铁9%‑11%、高碳锰铁1%‑4%、金属锰6%‑9%、金属锆1%‑3%、镍粉21%‑23%、钼粉1%‑2%、余量为铁粉。该药芯焊丝用于Q690钢的全位置焊接，不仅具有良好的焊接工艺性能，而且抗拉强度≥800MPa，屈服强度≥690MPa，伸长率≥20％，‑60℃下Akv≥80J，熔敷金属的扩散氢含量≤5.0mL / 100g，抗冷裂性能好。
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