Process for melting 25Cr2Ni4MoV rotor steel

A rotor steel and process technology, which is applied in the smelting process field of 25Cr2Ni4MoV rotor steel, can solve the problems of difficult to guarantee product performance, rotor cracking, and coarse grains in rotor heat treatment, so as to improve the purity of molten steel, prevent phosphorus reversion, and reduce non-metallic Effects of Inclusions and Gas Content

Inactive Publication Date: 2015-09-02
CITIC HEAVY INDUSTRIES CO LTD
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Problems solved by technology

The deoxidation of the traditional smelting process is generally through the precipitation deoxidation method of adding deoxidizer at the end of the primary smelting furnace and LF refining. The deoxidation products are mostly high melting point inclusions such as alumina and silicon oxide. Float in time to remove and stay in the molten steel, resulting in nodules in the nozzle during the pouring process of molten steel, resulting in a high content of inclusions in the steel ingot, which seriously affects product quality; in addition, the V content is also a key factor affecting the quality of the rotor. Cracking during the process,

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  • Process for melting 25Cr2Ni4MoV rotor steel
  • Process for melting 25Cr2Ni4MoV rotor steel

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[0021] A smelting process of 25Cr2Ni4MoV rotor steel, the weight percentage of each element content in 25Cr2Ni4MoV rotor steel is: C content 0.20%~0.25%, Si content≤0.10%, Mn content 0.20%~0.35%, P content≤0.010%, S content Content≤0.005%, Cr content 1.80%~2.00%, Ni content 3.55%~3.75%, Mo content 0.35%~0.45%, V content 0.05%~0.10%, Nb content 0.020%~0.030%, Cu content≤0.20% , Sb content ≤ 0.002%, Al content ≤ 0.010%, As content ≤ 0.015%, Sn content ≤ 0.010%, and the rest is Fe; the smelting process of 25Cr2Ni4MoV rotor steel specifically includes the following steps:

[0022] (1) Select raw materials

[0023] Select high-quality scrap steel and scrap, and mix it into pig iron;

[0024] (2) Primary smelting in electric arc furnace

[0025] Put the raw materials into the electric arc furnace for smelting. After the molten pool is formed at the lower end of the electrode, oxygen blowing and fluxing are started to make foamy slag. When the temperature of molten steel is ≥1550℃,...

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Abstract

The invention discloses a process for melting a 25Cr2Ni4MoV rotor steel. The process particularly comprises the following steps: (1) selecting the raw materials; (2) performing primary smelting in an electric-arc furnace; (3) refining by an LF furnace; (4) performing carbon deoxidization; (5) pouring. When preparing the materials, the high-quality steel scrap and the stub bar are selected, the harmful residual element contents As, Sn, Sb, Cu, Al in the steel solution are strictly controlled to met the process requirement; the operation of dominant slag and steel is processed during electric furnace tapping so that the rephosphorization is effectively prevented; the deoxidization method is a vacuum carbon deoxidization process, so that the molten steel non-metallic inclusion and the gas content are effectively reduced and the purity of the molten steel is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of steelmaking process, and in particular relates to a smelting process of 25Cr2Ni4MoV rotor steel. Background technique [0002] With the rapid development of the power industry in recent years, thermal power equipment has entered a higher-level development period, mainly focusing on improving efficiency and reducing pollution, energy consumption and cost. Power equipment is developing in the direction of high parameters, large capacity and automation. With the continuous enlargement of the unit and the increase in the size and weight of the rotor forgings, the requirements for the mechanical properties, metallurgical quality, forging equipment and quality of the materials are also getting higher and higher. This also correspondingly puts forward higher requirements for the steel ingot smelting process. [0003] 25Cr2Ni4MoV steel is a low-carbon high-strength alloy structural steel with superior mechanica...

Claims

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Application Information

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IPC IPC(8): C22C38/60C22C38/48C21C7/10C21C7/06
Inventor 李昌义宋玉冰薛秋云姬立功杜旋辛雪倩孙统辉田丰张瑞华陈明胡振志
Owner CITIC HEAVY INDUSTRIES CO LTD
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