A kind of submerged arc welding flux-cored welding wire and its preparation method

Abstract

A flux-cored welding wire for submerged arc welding, including a steel strip and a flux core, wherein the chemical composition of the steel strip, by weight percentage: C≤0.02%, Mn0.2‑1.2%, Si0.3‑1.8%, Cr22‑28 %, W2‑8%, Cu 0.2‑0.4%, V0.1‑0.3%, S≤0.005%, P≤0.006%, the balance is Fe; the composition of the drug core is calculated by its weight percentage: marble 20‑35%, Fluorite 15‑28%, Mica 7‑12%, Titanium Dioxide 6‑14%, Ferro Vanadium 2‑8%, Ferrosilicon 2‑6%, FerroTitanium 2‑12%, Ferroboron 13‑17%, Ferromolybdenum 2-8%, graphite 3-12%, and the balance is ferrochromium; the welding wire of the present invention can improve its toughness and crack resistance while improving the hardness of the deposited metal, and improve it from both metallurgy and technology. It ensures the strength, toughness and crack resistance of high-hardness deposited metal, and at the same time ensures good welding processability, easy slag removal, no spatter, high hardness and excellent wear resistance.

Description

technical field [0001] The invention relates to a welding material, in particular to a submerged arc welding flux-cored welding wire and a preparation method thereof. Background technique [0002] Self-submerged arc welding flux-cored wire has only received attention and attention, and it is used for outdoor welding of parts such as petroleum, bridges, natural gas, ships, and offshore platforms. In the late 1970s, Baosteel imported hundreds of tons of submerged arc welding from abroad in the late 1970s. Flux cored wire is used in metallurgy, rolling stock and other fields. [0003] Foreign submerged arc welding flux-cored welding wire mainly studies the performance of two kinds of submerged arc welding flux-cored welding wire with aluminum content of 1.7% and 0.53% respectively, and establishes relevant models to predict the microstructure change. Thermodynamic calculations show that AlN is better than Ti (C, N) and A1203 in high-alumina welds, and the opposite is true in ...

AI Technical Summary

Problems solved by technology

[0004] The production of flux-cored welding wire in my country currently exists: product quality and stability need to be further improved There is still a lot of work to be done in terms of further improving product quality and stability, and the product varieties and specifications need to be increased urgently; Increase varieties and specifications to meet different needs; The degree of production scale should be further expanded. Small production scale will cause many problems such as high product cost and poor product quality stability. Only when a certain production scale is reached, will it enter Virtuous circle

[0005] Judging from the current high-hardness surfacing materials at home and abroad, almost all of them have a hardness greater than or equal to 60HRC; the content of carbon and chromium in the surfacing materials is relatively high, which belongs to the high-carbon and high-chromium alloy system, and is often suitable for severe wear and tear. In working conditions where cracks are not sensitive, a small amount of cracks are allowed to exist during use, and this alloy system is obviously not suitable for roll surfacing layers that require high toughness and crack resistance

Images