A submerged arc welding wire for eh47 crack arrest steel

Abstract

A submerged arc welding wire for EH47 crack arresting steel, the chemical composition weight percentage is: C 0.05-0.10%; Si 0.15-0.25%; Mn 1.00-1.50%; P<0.010%; S<0.010%; Ti 0.015-0.025% %; Cr 0.05‑0.15%; Mo 0.15‑0.25%; Ni 1.5‑2.0%; N 0.0040‑0.0075%; the balance is Fe and other unavoidable impurities, and must meet at the same time: E COD =C+Mn / 8+Ni / 12, 0.410-0.440%; Ti / N, 3.30-3.50. The submerged arc welding wire of the present invention, when the welding wire is matched with the basic flux SJ101, can obtain a weld that meets the requirements of the EH47 welding joint, and has excellent fracture toughness, the yield strength of the weld is ≥ 460 MPa; the tensile strength is ≥ 570 MPa, and the impact energy at -60 °C Greater than 80J, weld CTOD value δ 0 ≥0.25mm (-40°C).

Description

technical field [0001] The invention relates to the technical field of welding wires, in particular to a submerged arc welding wire for EH47 crack arresting steel. Background technique [0002] The localization of high-tech ships and high-end offshore steel products in China is in the research and development stage. The construction of high-tech ships such as new super-large container ships, liquefied gas ships, and high-end offshore platforms such as deep-sea platforms requires the import of a large number of high-grade steel plates, including high-grade steel plates. The supporting welding materials required for steel plate welding are basically all imported. For new high-grade steel plates such as high-tech ship crack arrest steel, low-temperature steel, polar steel, marine steel with excellent CTOD performance, and steel for high-humidity and heat environments in the South China Sea, the corresponding supporting welding materials are crucial for the smooth domestic produ...

AI Technical Summary

Problems solved by technology

[0009] Chinese Patent Publication No. CN106001990 discloses a high-strength and tough submerged arc welding wire for high-strength steel for offshore platforms. It is characterized in that the yield strength is as high as 650-800 MPa, and it is mainly suitable for steel plates of E690 grade. For EH47, the strength is too high and the toughness is insufficient. , and there is no crack arrest performance design

Other patents such as CN1714985 mainly reflect the weather resistance performance, and CN1923433 mainly embodies the high heat input welding characteristics, which generally guarantee the toughness and toughness, and there is no special design for CTOD fracture toughness

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