Method for revolving furnace smelting 45CrMnMo steel

A converter smelting and converter technology, applied in the field of metallurgy, can solve the problems of low alloy yield, prolonged smelting time, less than 90%, etc. Effect
CN101550516AInactive Publication Date: 2009-10-07PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
PANGANG GROUP RESEARCH INSTITUTE CO LTD
Publication Date
2009-10-07
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a producing method for revolving furnace smelting 45CrMnMo steel, which belongs to metallurgy field. The technical scheme includes the following steps: a) adding desulphurizing hot-metal into the revolving furnace, and smelting with adding lime stock, b) gradually adding the chromium irons, ferro-molybdenum and silicon-manganese alloy confected by proportion into molten steel parcel during the revolving furnace exporting molten steel, and adding coherer aluminum into the molten steel parcel to be deoxidized at the same time, c) blowing argon gas into the molten steel in the ladle after tapping, d) vacuum treating the molten steel and carrying through micro-adjustment with the chemical constituents in the vacuum procedure at the same time, then casting 45CrMnMo steel. The invention provides a method for revolving furnace producing 45CrMnMo steel, in which the recovery rate of chromium iron is higher, saves more time, improves economic benefit, and provides a better choice for producing 45CrMnMo steel.
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Description

technical field

[0001] The invention belongs to the field of metallurgy, and in particular relates to a method for smelting 45CrMnMo steel in a converter. Background technique

[0002] 45CrMnMo steel is a special steel used in the production of oil drill collars. The drill collar is a key component of the drill string in oil drilling facilities, and it is the part that connects the drill bit and the drill pipe. The main function is to transmit torque to the drill bit, provide drilling pressure, ensure the rigidity and stability of the lower part of the drill string and prevent well deviation. The chemical composition (weight%) of 45CrMnMo steel is: carbon 0.42-0.48%; silicon 0.15-0.30%; manganese 0.75-1.20%; molybdenum 0.15-0.25%; chromium 0.75-1.20%; . Each item of low-magnification structure is ≀2.0, each level of non-metallic inclusions is ≀2.5, and the total level of non-metallic inclusions is ≀16. The grain size of 45CrMnMo steel after heat treatment is β‰₯5.0, the yi...

Claims

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