Continuous casting production method of small square billet of hollow steel for drill tool
A technology of continuous casting and production method of small billet, which is applied in the direction of manufacturing tools, casting equipment, casting melt containers, etc. Effect
Inactive Publication Date: 2019-08-16
SHOUGANG CORPORATION +1
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Problems solved by technology
[0004] The purpose of the present invention is to provide a continuous casting production method of hollow steel billets for drilling tools, which solves the problem that the current technology needs to carry out secondary casting of die-casting ingots or large-section billets, and the billet density is low
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Embodiment 1
[0019] A production method of billet continuous casting of hollow steel for 55SiMnMo drilling tools. This embodiment takes the production of hollow steel of Shougang Guigang as an example. The specific steps and parameters are as follows:
[0020] 1. Electric furnace smelting: 100% all scrap steel smelting production, the carbon content at the end of the electric furnace is 0.1wt%, the tapping temperature is controlled at 1640°C, and the aluminum-containing deoxidizer is used for deoxidation after tapping.
[0021] 2. LF-VD refining: LF furnace processing time is 70 minutes, VD furnace processing time is 30 minutes, and the composition meets the requirements of steel grade standards.
[0022] 3. Billet full-protection casting: the billet continuous casting machine is a 4-machine, 4-flow type 150mm×150mm billet continuous casting machine;
[0023] 1) A T-shaped tundish is used, and a U-shaped slag retaining wall with diversion holes is installed in the tundish;
[0024] 2) The...
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The invention discloses a continuous casting production method of a small square billet of hollow steel for a drill tool, and belongs to the technical field of special steel smelting production. The continuous casting production method is suitable for a 120*120 mm<2>-200*200 mm<2> billet continuous casting machine. The production method comprises the following steps that a 100% high-quality full-waste steel electric furnace is adopted for smelting, and LF-VD refining is carried out, wherein the processing time of an LF is 30-70 minutes, and the processing time of a VD furnace is 10-30 minutes;the small square billet is fully protected and cast, wherein a large ladle cover is additionally arranged for heat preservation in the pouring process, the pulling speed of the continuous casting machine is 1.5-1.9 m / min, the casting period is 50-70 minutes / furnace, and casting blank inspection is carried out after slow cooling; and finally, the production of the hollow steel is completed througha drilling method. The method has the advantages that secondary cogging of a die casting or a large-section casting blank is replaced by an optimization process, and meanwhile, the processes of continuous casting tail end electromagnetic stirring and the like are cancelled, so that the density of a casting blank is improved, the casting blank can be directly drilled to produce the hollow steel, and the production cost and the operation difficulty are effectively reduced.
Description
technical field [0001] The invention belongs to the technical field of special steel smelting and production, and in particular relates to a production method of billet continuous casting of hollow steel for drilling tools. It is suitable for the subsequent production of casting slabs for the production of hollow steel by the drilling method. Background technique [0002] There are two types of brazing steel, namely solid brazing steel and hollow brazing steel. The latter is what people usually call hollow steel. Hollow steel is a hexagonal or circular bar structural steel with a circular through hole in the center. After partial upsetting forging, partial machining, partial or overall heat treatment, it can be made into a drilling tool product—drilling rod. For the production of small-sized hollow steel, it is generally produced by casting pipe method, hot piercing and hot drawing, rolling method and drilling method. Among them, high-quality hollow steel products at home...
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IPC IPC(8): B22D11/111B22D11/16B22D41/00B23P15/00C21C5/52C21C7/00C21C7/06C21C7/10
CPCB22D11/111B22D11/16B22D41/00B23P15/00C21C5/52C21C7/0006C21C7/06C21C7/10Y02P10/20
Inventor 张慧峰熊家泽邓素怀杨接明刘厚权王翔刘银波徐士新刘轲
Owner SHOUGANG CORPORATION