Dephosphorization and chromium-preserving smelting process of crmo steel scrap
A waste and dephosphorization technology, applied in the direction of process efficiency improvement, furnace type, furnace, etc., can solve the problems of waste of resources and energy consumption, reduce surface tension and crack resistance, etc., to reduce production costs, reduce metallurgical energy consumption, Effect of CO2 emission reduction
Active Publication Date: 2016-02-24
ZHANGJIAGANG CITY GUANGDA MACHINERY FORGING
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Problems solved by technology
[0003] As we all know, alloy steel uses emulsion to cool and lubricate during the cutting process. During the natural stacking process of waste chips, they often contact the medium and cause corrosion, so that there are a lot of harmful impurities in the waste chips. The negative effect of alloy steel waste recycling is Phosphorus enrichment, high phosphorus content will cause the "cold brittleness" of steel, reduce the surface tension and crack resistance of steel, dephosphorization is one of the important tasks in smelting alloy steel, the dephosphorization method in the current smelting process, the steel The Cr in the alloy is also oxidized together. During the smelting process, ferroalloy needs to be added to match the effective components such as Cr in the alloy, resulting in a waste of resources and an increase in energy consumption.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0016] CrMo steel scrap dephosphorization and chromium-preserving smelting process comprises the following steps:
[0017] (1) Smelting scrap in medium frequency induction furnace
[0018] Melt waste molten iron, oxidation temperature is 1620°C, C removal rate in crude water is 0.40%, end point C is 0.08%, slag tapping temperature is 1620°C, tapping temperature is 1630°C, double slag blocking tapping, tapping time is 170 seconds;
[0019] (2) Refining molten steel in LF furnace enters LF furnace, and goes to the ladle for refining to add CaO / BaO mixed base dephosphorization agent 12kg / t, compound molten steel refining agent 4kg / t, CaSi line 0.5kg / t, alkalinity control is 4.0, Oxygen is supplied by the oxygen lance, the protective gas is stirred, and the pressure of the protective gas is controlled at 0.2MPa; the amount of slag is controlled at 16%, the excess is discharged, and the refining temperature is 1595°C for 12 minutes;
[0020] (3) The molten steel refined in the VD ...
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Abstract
The invention discloses a CrMo steel waste dephosphorization and chromium-preserving smelting process, which belongs to the category of resource recycling and green manufacturing. The raw material used is chip alloy waste, which is smelted by an intermediate frequency induction furnace, and a specific content of Bao / Cao mixed base dephosphorization agent is added. , using low-vacuum dephosphorization and chromium-preserving process technology, which reduces metallurgical energy consumption and CO2 emissions in the steelmaking process. The content of element P is 0.01%, and the recovery rate of Cr reaches 92%. Its alloy composition meets the requirements of American ASTM standards. , Improve the recovery rate of Cr, Ni, Mo and other alloying elements in scrap steel, and reduce the production cost of steel by about 250 yuan per ton.
Description
technical field [0001] The invention belongs to a steelmaking process, in particular to a CrMo steel waste dephosphorization and chromium-preserving smelting process. Background technique [0002] CrMo steel is the most representative type of steel among alloy steels, also known as medium-temperature hydrogen-resistant steel. It has good hydrogen corrosion resistance and high temperature resistance, so it is widely used in ships, oil refining, chemical industry, electric locomotives, gas turbines and other equipment requiring corrosion resistance and high temperature equipment. Due to the unique properties of CrMo steel and alloy steel Recycled materials can be used to reduce production costs and other factors. The economical production method of smelting high-quality CrMo steel under renewable resources has been continuously explored at home and abroad. [0003] As we all know, alloy steel uses emulsion to cool and lubricate during the cutting process. During the natural s...
Claims
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IPC IPC(8): C21C5/52C21C7/064C21C7/10
CPCY02P10/20
Inventor 罗晓芳
Owner ZHANGJIAGANG CITY GUANGDA MACHINERY FORGING