Smelting method of high nitrogen martensitic stainless steel
A technology of martensitic stainless steel and smelting methods, applied in the manufacture of converters, etc., can solve the problems of reducing production efficiency, increasing nitrogen by blowing nitrogen, and denitrifying by blowing argon, so as to avoid repeated nitrogen blowing, high utilization rate, and reduce consumption volume effect
Inactive Publication Date: 2018-04-13
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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Problems solved by technology
Since the nitrogen content in molten steel is affected by the temperature of molten steel, chemical composition, converter conditions, etc., the smelting of high-nitrogen stainless steel in AOD furnace is prone to repeated nitrogen blowing to increase nitrogen and argon to denitrify, which increases energy consumption and is not conducive to the life of AOD converter. , reduce production efficiency
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[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0022] 20Cr13HN martensitic stainless steel, according to the mass percentage, its chemical composition is, C: 0.190%, Si: 0.500%, Mn: 0.600%, P: 0.015%, S: 0.001%, Ni: 0.095%, Cr: 13.800%, Cu: 0.018%, N: 0.092%, and the balance is mainly Fe.
[0023] The smelting method of 20Cr13HN martensitic stainless steel is carried out according to the following steps:
[0024] (1) Dephosphorization converter smelting: Si, P, C, and Mn elements in blast furnace molten iron are removed by stirring the dephosphorized converter top blowing oxygen lance and bottom blowing nitrogen. The molten iron after dephosphorization is required to be < 0.150%, C is 2.500-4.000%, P is <0.010%, and Mn is 0.200-0.500%.
[0025] (2) AOD furnace smelting: molten iron is mixed at a temperature of 1360°C, and nitrogen is blown to the annular gap of the side blowing gun duri...
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The invention belongs to the technical field of smelting, and mainly relates to a smelting method of high nitrogen martensitic stainless steel. A technology method that the liquid nitrogen content ofsteel is controlled by an argon oxygen decarburization furnace (AOD) and a ladle refining furnace (LF) is adopted; the controlled percentages of components in molten steel is the same as the mass percentages of chemical components in obtained liquid steel: by mass, 0.150-0.450% of C, 0.400-0.800% of Si, 0.400-0.800% of Mn, less than or equal to 0.020% of P, less than or equal to 0.001% of S, lessthan or equal to 0.250% of Ni, 12.000-14.000% of Cr, less than or equal to 0.250% of Cu, 0.080-0.150% of N and the balance Fe. By adopting the smelting method, the smelting production process can be stabilized, the smelting cost can be reduced, the strength performance of a plate product after quenching is conducted can be effectively improved, the high utilization rates of nitrogen and argon areachieved, nitrogen replaces argon in the decarburization process of the AOD furnace, the consumption amount of high-cost argon is reduced, and the problem that the production period and the service life of the AOD furnace are influenced due to the fact that the AOD furnace is subjected to nitrogen blowing and argon blowing repeatedly can be effectively avoided by adopting an LF finery nitrogen bottom blowing stably nitrogen controlling technology.
Description
technical field [0001] The invention belongs to the technical field of smelting, and mainly relates to a method for smelting high-nitrogen martensitic stainless steel. Background technique [0002] Martensitic stainless steel is mainly used in civilian products such as tableware and knives, which require strong cutting ability, wear resistance and corrosion resistance. At present, the main steel types are SUS420J1 (20Cr13), 30Cr13, 4Cr13, 5Cr15MoV, etc. Nitrogen is used as an alloying element in martensitic, austenitic, and duplex series stainless steels. It can effectively improve the strength performance of products through solid solution strengthening and precipitation strengthening, and also improve the resistance to intergranular corrosion of austenitic and duplex stainless steel series. , Corrosion resistance such as pitting corrosion. [0003] Nitrogen-containing stainless steel smelting usually uses nitrogen and argon blowing in AOD furnace to meet the requirements ...
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Login to View More IPC IPC(8): C21C5/35C21C7/072C21C7/06C21C7/068C22C38/02C22C38/04C22C38/42
CPCC21C5/005C21C7/06C21C7/0685C21C7/072C22C38/001C22C38/02C22C38/04C22C38/42
Inventor 徐斌李聚宝纪显彬吴德明
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD