21-10Mn7Mo steel ingot and smelting process thereof

Abstract

The invention provides a 21-10Mn7Mo steel ingot and a smelting process thereof, belonging to the technology of solid cored welding wires for gas-shielded arc welding, and in particular provides a smelting method and a steel ingot prepared by using the method. The steel ingot comprises the following chemical components by mass percent: not more than 0.10% of C, not more than 0.8% of Si, 5.5-8.0% of Mn, not more than 0.030% of P, not more than 0.020% of S, 9.0-11.0% of Ni, 19.0-22.0% of Cr and 0.5-2.0% of Mo, wherein the Mn / Mo ratio is controlled to be 7-7.5. The problem that Mn is easy to burn out in a remelting process can be effectively avoided through reasonable component allocation and setting of the Mo / Mn ratio. The steel ingot has the beneficial effects that the strength and corrosion resistance of the steel ingot are effectively improved; the technical effect of fine crystal strengthening is achieved by refining microscopic crystal particles of steel; with the components, the steel ingot has better degree of purity and uniformity and has good impacts on welding wire processing and subsequent welding.

Description

technical field [0001] This case belongs to the field of welding technology, and involves the preparation method of solid welding wire for gas shielded arc welding, its finished products and its process equipment. In particular the method of smelting and its ingots. Background technique [0002] Stainless steel welding wire and welding rod are used more and more in automation technology, but the common quality problems of stainless steel welding wire prepared by existing technologies are that the appearance of the welding wire is not good, and the wire feeding is not stable enough, so it is difficult to meet the requirements of high-automation welding equipment. [0003] It is generally known that the quality of welding wire is closely related to the subtle changes in chemical composition caused by steelmaking, and has a close relationship with the impurity content of material components. What is important is that the welding wire preparation process and process equipment ar...

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Problems solved by technology

[0011] The welding wire in this case is an innovation based on the existing H1Cr21Ni10Mn6 welding wire, including adding an appropriate amount of Mo and increasing the content of Mn correspondingly. The problem is that the change of the material composition will bring technical difficulties to the later production. It is generally known that, When the content of molybdenum in alloy steel is within a certain range, molybdenum will reduce the plasticity and toughness of alloy steel, so the industry urgently needs to solve such problems by improving the process methods including smelting

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