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High-nitrogen austenitic stainless steel smelting method

A technology of high-nitrogen austenite and smelting methods, applied in the field of stainless steel production, can solve the problems of increased difficulty in controlling the cleanliness of molten steel and affecting the control accuracy of nitrogen content, and reduce the incidence of central loose defects, energy consumption and production costs Low, the effect of reducing the cost of smelting

Pending Publication Date: 2018-12-07
SHANDONG TAISHAN STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent application number 201210550153.4 discloses a high-nitrogen and high-manganese stainless steel and its smelting method. The process uses an electric furnace to melt scrap steel containing manganese and chromium or high-carbon ferrochromium. Add 2 to 2.5 tons of manganese nitride alloy. Although this process meets the requirements of nitrogen and manganese content in high-nitrogen steel, adding a large amount of alloy to molten steel that has been fully reduced will increase the difficulty of controlling the cleanliness of molten steel. And affect the control accuracy of nitrogen content and chromium content

Method used

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Embodiment 1

[0029] A method for smelting high-nitrogen austenitic stainless steel, comprising the steps of:

[0030] (1) Desiliconization treatment, desulfurization treatment and dephosphorization treatment are carried out in blast furnace molten iron in the molten iron tank. Iron oxide scale and fluorite are added into the molten iron tank and lime powder is sprayed by the dusting gun at the same time for desiliconization treatment. When the silicon content in the molten iron reaches 0.13%, start top lance oxygen blowing to carry out dephosphorization treatment and desulfurization treatment simultaneously; the mass distribution ratio of molten iron after treatment is: C: 4.0%, Si: 0.009%, P: 0.014%, S: 0.023%, and the temperature of molten iron is 1400℃ . Oxygen blowing flow 30Nm 3 / min, the gun position is 1.0m, the flow rate of lime powder sprayed by the dusting gun is 50kg / min, 0.25kg of oxidized iron scale is required for each ton of molten iron, and 200kg of fluorite is added to th...

Embodiment 2

[0035] A method for smelting high-nitrogen austenitic stainless steel, comprising the steps of:

[0036] (1) Desiliconization treatment, desulfurization treatment and dephosphorization treatment are carried out in blast furnace molten iron in the molten iron tank. Iron oxide scale and fluorite are added into the molten iron tank and lime powder is sprayed by the dusting gun at the same time for desiliconization treatment. When the silicon content in the molten iron reaches 0.11%, start top lance oxygen blowing to carry out dephosphorization treatment and desulfurization treatment simultaneously; the mass distribution ratio of molten iron after treatment is: C: 5.0%, Si: 0.007%, P: 0.012%, S: 0.021%, and the temperature of molten iron is 1500℃ . Oxygen blowing flow rate 10Nm 3 / min, the gun position is 0.7m, the flow rate of lime powder sprayed by the powder spray gun is 30kg / min, the iron sheet needs to be 0.15kg per ton of molten iron, and 100kg of fluorite is added to the m...

Embodiment 3

[0041] A method for smelting high-nitrogen austenitic stainless steel, comprising the steps of:

[0042] (1) Desiliconization treatment, desulfurization treatment and dephosphorization treatment are carried out in blast furnace molten iron in the molten iron tank. Iron oxide scale and fluorite are added into the molten iron tank and lime powder is sprayed by the dusting gun at the same time for desiliconization treatment. When the silicon content in the molten iron reaches 0.13%, start top lance oxygen blowing to carry out dephosphorization treatment and desulfurization treatment simultaneously; the mass distribution ratio of molten iron after treatment is: C: 3.5%, Si: 0.008%, P: 0.011%, S: 0.023%, and the temperature of molten iron is 1600℃ . Oxygen blowing flow rate 20Nm 3 / min, the gun position is 0.8m, the flow rate of lime powder sprayed by the dusting gun is 40kg / min, the iron sheet needs to be oxidized 0.20kg per ton of molten iron, and 150kg of fluorite is added to t...

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Abstract

The invention relates to a high-nitrogen austenitic stainless steel smelting method. The high-nitrogen austenitic stainless steel smelting method comprises the following steps of (1) blast-furnace molten iron pretreatment, (2) refining in a top-bottom combined blowing TSR stainless steel refining furnace, (3) refining outside a ladle refining furnace and (4) continuous casting. Compared with the prior art, the high-nitrogen austenitic stainless steel smelting method has the characteristics that the smelting cost is low, and the plate blank surface and interior quality meets the steel type requirements of the high-nitrogen austenitic stainless steel.

Description

technical field [0001] The invention relates to the technical field of stainless steel production, in particular to a method for smelting high-nitrogen austenitic stainless steel. Background technique [0002] High-nitrogen austenitic stainless steel refers to austenitic stainless steel with a nitrogen content exceeding 0.4% (mass fraction) in steel. This type of steel generally exhibits high strength, high toughness, and corrosion resistance, especially grain boundary corrosion resistance. And other advantages, and has fatigue strength and good welding performance. [0003] The role of nitrogen in stainless steel, on the one hand, as a solid solution strengthening element, can effectively refine the grain, improve the yield strength, tensile strength and corrosion resistance of austenitic stainless steel, on the other hand, as a strong austenite forming element, It can effectively reduce the formation ability of ferrite and deformed martensite, which greatly saves nickel r...

Claims

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Application Information

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IPC IPC(8): B22D11/115B22D11/117B22D11/16B22D11/22C21C7/00C21C7/06C21C7/064C21C7/068C22C33/04C22C38/02C22C38/58
CPCB22D11/115B22D11/117B22D11/16B22D11/22C21C7/0006C21C7/06C21C7/064C21C7/0685C22C33/04C22C38/001C22C38/002C22C38/02C22C38/58
Inventor 王永胜陈培敦王俊海亓海燕王宏霞张爽李江江吴月龙李铁谷宁
Owner SHANDONG TAISHAN STEEL GROUP
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