Martensite stainless steel smelting process

A martensitic stainless steel, process technology, applied in the field of smelting, can solve the problems of alloy loss, long smelting time, cumbersome process, etc., and achieve the effect of avoiding re-oxidation and shortening smelting time

Active Publication Date: 2013-05-22
TONGYU HEAVY IND
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Problems solved by technology

[0003] The purpose of the present invention is to provide a martensitic stainless steel smelting process to solve the problems of long smelting time, cumbersome process and high cost in the prior art, and a small amount of alloy loss during the VOD process.

Method used

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Embodiment Construction

[0012] This process is non-VOD smelting, which reduces the VOD or AOD process and the subsequent re-reduction process of unstable oxides, and needs to continue slagging to remove oxidation products, so that the ladle is kept at high temperature for a long time, which accelerates the corrosion loss of the ladle ; The content of C and P is reduced in the final composition; the specific raw material composition percentage of martensitic stainless steel is as follows:

[0013] C: 0.1%, Cr: 9.3%, Mo: 1%, N: 0.040%, P: 0.01%, Fe89.5%.

[0014] The process steps of martensitic stainless steel smelting are as follows:

[0015] A: EAF rough smelting: The molten steel mixed with raw materials according to the above ratio is rough smelted in EAF; EAF rough smelting molten steel, in order to ensure that the C content does not exceed the standard, and the P content is low enough, EAF must ensure that P≤0.003% when tapping, C≤0.02%, secondary slagging can be carried out at 1570 ° C, EAF st...

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Abstract

The invention discloses a martensite stainless steel smelting process which is characterized in that the process adopts non-VOD (vacuum oxygen decarbufization) smelting, secondary reduction processes of unstable oxides in and after the VOD or AOD (argon oxygen decarburization) process are reduced, and the oxidation products are removed through continuous slagging, so that the steel ladle is positioned in a high-temperature state for a long time, and erosion loss of the steel ladle is accelerated; the contents of C and P in final components are reduced; the martensite stainless steel comprises the following raw material components in percentage by weight: 0.09-0.12 percent of C, 8-9.5 percent of Cr, 0.85-1.05 percent of Mo, 0.030-0.060 percent of N, less than or equal to 0.02 percent of P and the balance of Fe; and the smelting process comprises the following steps of: A, performing EAF (electric arch furnace) crude refining; B, performing LF (ladle furnace) refining, C, performing VD refining, D, adding chromium nitride and E, discharging to obtain the martensite stainless steel product. According to the process, the smelting time is shortened, the contents of C and P are guaranteed, and the re-oxidation of Cr and carbon is avoided.

Description

technical field [0001] The invention belongs to the technical field of smelting. Background technique [0002] P91 is a kind of martensitic stainless steel, which is characterized by carbon content of 0.09%-0.12%, the total content of Cr and Mo elements is about 10%, and nitrogen content of 0.030%-0.060%. Due to the high alloy content, the heating time during refining is too long , will inevitably cause serious increase in molten steel C. One of the current smelting methods is the VOD method, and the other is the AOD method. However, the disadvantages of these two processes are that the smelting time is long, the refining time is more than 3 hours, and the process is cumbersome. After the VOD / AOD process is completed, there is also a reduction process of Cr oxides, and the cost is also high. At the same time, there is also a small amount of alloy loss. Contents of the invention [0003] The purpose of the present invention is to provide a martensitic stainless steel sme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C21C5/52C21C7/00C21C7/10
CPCY02P10/216Y02P10/20
Inventor 司兴奎刘殿山倪洪运王成业
Owner TONGYU HEAVY IND
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