Flux-cored welding wire for repairing hot forging die and using method thereof

Abstract

The invention provides a flux-cored welding wire for repairing a hot forging die and a method for using the same. The flux-cored welding wire includes an alloy steel strip sheath and a flux-cored powder, wherein the components in the alloy steel strip sheath and their proportion in the total mass of the steel strip sheath are provided. The percentages are: C0.20~0.29%, Si0.60~0.70%, Mn0.5~0.8%, S≤0.01%, P≤0.015%, Cr12~13%, Ni2~3%, Mo4.0~4.9 %, V0.3~0.5%, the balance is Fe; the components in the core powder and their percentages in the total mass of the core powder are: rutile 55-60%, sodium fluoride 3-5%, magnetite 1-2%, potassium cryolite 3-5%, zircon sand 5-8%, potassium titanate 4-7%, cerium oxide 2-3%, the balance is Fe; the flux-cored welding wire of the present invention passes through the alloy The main alloying elements are transferred to the outer skin of the steel strip, which improves the transition rate of the alloying elements, so that the surfacing metal has better wear resistance hardness and impact toughness, and improves the service life of the hot forging die.

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 method for using the same. 【Background technique】 [0002] Hot forging die is a die used for "die forging" production in hot forging manufacturing process. The common material of 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 cold and heat fatigue resistance, and is not easy to produce thermal fatigue cracks. It can be used as both a die-casting die and a hot forging die. It is a kind of strong and tough steel with high quality and low price. Because the hot forging die is repeatedly heated and cooled, and works under the condition of high unit pressure and impact, the surface will be damaged after working for a period of time (usually a new set of dies will have problems wh...

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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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