Flux-cored wire for repairing hot forging die and using method of flux-cored wire

Abstract

The invention provides a flux-cored wire for repairing a hot forging die and a using method of the flux-cored wire. The flux-cored wire comprises an alloy steel strip outer skin and flux-cored powder; the alloy steel strip outer skin is prepared from the components including, by mass, 0.20%-0.29% of C, 0.60%-0.70% of Si, 0.5%-0.8% of Mn, less than or equal to 0.01% of S, less than or equal to 0.015% of P, 12%-13% of Cr, 2%-3% of Ni, 4.0%-4.9% of Mo, 0.3%-0.5% of V and the balance Fe; the flux core powder is prepared from the components including, by mass, 55%-60% of rutile, 3%-5% of sodium fluoride, 1%-2% of magnetite, 3%-5% of potassium cryolite, 5%-8% of zircon sand, 4%-7% of potassium titanate, 2%-3% of cerium oxide and the balance Fe. According to the flux-cored wire, main alloy elements are transited through the alloy steel strip outer skin, the transition rate of the alloy elements is increased, so that surfacing metal has good abrasion resistance and impact toughness, and the service life of the hot forging die is prolonged.

Description

【Technical field】 [0001] The invention belongs to the technical field of welding materials, and in particular relates to a flux-cored welding wire for repairing a hot forging die and a using method thereof. 【Background technique】 [0002] The hot forging die is the die used in the production of "die forging" in the hot forging manufacturing process. The common material of the hot forging die is hot forging die steel (such as 5CrMnMo), which is a kind of air-cooled hardening die steel widely used at home and abroad. It has high toughness and resistance to cold and heat fatigue, and is not easy to produce thermal fatigue cracks. It can be used as a die-casting mold and a hot forging mold. It is a kind of steel with high quality and low price. Due to the repeated heating and cooling of the hot forging die, and under the condition of high unit pressure and impact, the surface will be damaged after working for a period of time (usually a set of new dies will have problems with ab...

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Problems solved by technology

[0003] However, the service life of the hot forging die repaired by existing surfacing materials is short. For example, patents CN201410748560.6 and CN201510015261.5 disclose a hot forging die repair flux-cored welding wire, but both of them use carbon steel With wrapped drug core powder, the main alloying elements are transitioned through the drug core powder. Since there are few minerals added to the drug core, it is difficult to achieve all-position welding, and the service life of the hot forging die repaired by this patented technology is not very high (up to 13500 pieces)

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