Method for producing steel for small square billet continuous casting high titanium alloy bonding wire

Abstract

A method for producing steel used in a titanium master alloy bonding wire by small billet continuous casting belongs to the steelmaking technical field. The process route is as follows: low-sulfur molten iron and scrap steel, converter blowing, slag blocking and tapping, steel ladle deoxidation alloying, secondary refining, complete protection continuous casting by a small billet caster and casting blank inspection. The method is characterized by controlling technical parameters of critical process links, reducing the contents of aluminum and nitrogen in the molten steel, solving the problem of submerged nozzle clogging and crystallizer protecting slag floater easily occurring at the small billet continuous casting of high titanium steel variety, and realizing the smooth production of the steel used in the titanium master alloy bonding wire by the small billet continuous casting. The method has the advantages of being capable of replacing a production process for producing the steel used in the titanium master alloy bonding wire by continuous casting of die casting and large billets, achieving 0.08-0.17% titanium content of a product and fully meeting the use requirement of the steel used in the bonding wire.

Description

Technical field [0001] The invention belongs to the technical field of steelmaking, and in particular provides a method for producing steel for billet continuous casting of high-titanium alloy welding wire; it is specially applied to the production of a class of high-titanium high-strength alloy welding wire steel, which can replace die Casting and bloom continuous casting production methods. Background technique [0002] So far, the development of welding technology has been aimed at increasing energy rate and efficiency. As far as welding materials are concerned, higher energy efficiency includes welding materials that can achieve high deposition and high speed, welding materials with excellent all-position weldability, etc.; higher efficiency includes welding materials that can omit post-processing steps by reducing spatter, etc. . Welding materials have evolved from welding rods to submerged arc welding wires, and then to solid-core welding wires and flux-cored welding wires....

AI Technical Summary

Problems solved by technology

However, due to the relatively high titanium content of this type of steel, problems have been exposed in smelting production: nozzle blockage and mold slag agglomeration (commonly known as "fish formation") are prone to occur in the continuous casting process, see figure 1 )

On the one hand, the blockage of the nozzle will deteriorate the quality of the billet, and on the other hand, it may also lead to the interruption of production; the crystallization of mold slag will directly affect the quality of the billet, and then the rolled material will have serious scarring, as follows figure 2 , image 3 As shown, the welding wire production plant cannot be drawn and used smoothly. In addition, the mold slag will also cause risks such as leakage and endanger production safety.

The key to solving these two problems is to control the content of aluminum, nitrogen and other elements in the molten steel within an appropriate range, but it is difficult to achieve under the conventional technical conditions of the billet continuous casting process

In order to reduce the harm of these problems, advanced iron and steel production enterprises at home and abroad adopt die casting technology or large billet continuous casting when producing titanium-containing long products, and then roll after blanking, such as steel in Japan, South Korea and other countries. The company's continuous casting billet shape is 300×400mm 2 Left and right, the existing mature technology in China is the die casting method, and both the bloom continuous casting and the die casting process have the disadvantages of long process, low yield and high production cost

[0004] The billet shape currently used by Shougang Corporation is 130×130mm 2 Billet, compared with the die casting and bloom production process, the billet production process has the advantages of high yield and low production cost, but it is more susceptible to the above problems due to the change of the specific surface area of ​​the billet when casting high titanium steel. negative impact

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