Self-shielded flux-cored wire for non-magnetic steel 20Mn23Al and preparing method of wire

Abstract

The invention discloses a s elf-shielded flux-cored wire for non-magnetic steel 20Mn23Al. The wire comprises a flux core and a skin; the flux core is composed of 18 to 28% of chromium powder, 2 to 8% of nickel powder, 1.5 to 3.5% of molybdenum powder, 2.5 to 10% of manganese powder, 0.5 to 1.5% of ferrosilicon powder, 2 to 8% of aluminum and magnesium, 0.5 to 1.5% of ferrocolumbium, 0.5 to 1% of ferrotitanium, 10 to 17% of barium fluoride, 5 to 15% of magnesium oxide, 1 to 5% of aluminum oxide, 0.5 to 1.5% of cerium oxide, 1 to 3.5% of quartz sand, 18 to 26% of rutile, 2 to 8% of zircon sand, 1 to 3% of lithium carbonate, 0.5 to 3% of calcium carbonate and 0.5 to 5% of iron oxide powder. The wire is used for 20Mn23Al welding, protection gas does not need to be added, a welding joint with higher tensile strength and corrosion resistance can be obtained, the welding wire is simple in preparing method, and large-scale batched production is facilitated.

Description

technical field

[0001] The invention belongs to the technical field of metal material welding, and in particular relates to a self-protecting flux-cored welding wire for non-magnetic steel 20Mn23Al, and also relates to a preparation method of the flux-cored welding wire. Background technique

[0002] The non-magnetic steel belongs to the Fe—Mn—Al—C series austenitic metal material. 20Mn23A1 is used as a special low magnetic steel plate for transformers. It has low permeability and high resistivity. The eddy current loss in the magnetic field is extremely small, thereby improving the performance of the transformer. Therefore, this iron-manganese-aluminum low-magnet steel has been widely used in transformer manufacturers across the country. Moreover, the mechanical properties are excellent, and the cutting, welding, drilling, bending, etc. are as easy as ordinary steel in processing and manufacturing. Compared with stainless steel, it not only reduces material costs, improves...