CN103484746A - Method for remelting high-strength stainless steel - Google Patents
Method for remelting high-strength stainless steel Download PDFInfo
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- CN103484746A CN103484746A CN201310421753.5A CN201310421753A CN103484746A CN 103484746 A CN103484746 A CN 103484746A CN 201310421753 A CN201310421753 A CN 201310421753A CN 103484746 A CN103484746 A CN 103484746A
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Abstract
The invention relates to a method for remelting high-strength stainless steel. The method is characterized by including the steps that Fe-Mn-Cr nitrogen absorption alloy melt containing manganese and chromium is first smelted, then, high-nitrogen steel waste material is added to the nitrogen absorption alloy melt step by step at low melt temperature, nitrogen-containing alloy is added in proportion according to the designed composition proportion of high-nitrogen steel, and after being completely melted and homogenized, the nitrogen-containing alloy is discharged for pouring. The method solves the problem that the nitrogen content is insufficient in the recovering and remelting processes of the high-nitrogen steel waste material and can control the nitrogen content of new high-nitrogen steel smelted by the high-nitrogen steel waste material to be close to or not lower than that of the original high-nitrogen steel waste material.
Description
Technical field
The present invention relates to a kind of method of remelting high-strength stainless steel, is a kind of method of normal pressure refusion and smelting high nitrogen stainless steel, belongs to field of iron and steel smelting.
Background technology
High nitrogen stainless steel (hereinafter referred to as high nitrogen steel) is attracted attention with excellent properties such as its joint nickel, anti-corrosion, high strength, high-ductilities, as anti-corrosion stainless novel steel grade of tough while of height, can obtain widespread use in broader more complicated field.
High nitrogen steel (N >=0.6wt%) nitrogen when smelting is more difficult to add and easily overflows from melt and form nitrogen, therefore general the employing under high pressure smelted, same, high nitrogen steel molten melt back body again, also to adopt melt back under high pressure, otherwise also can make the nitrogen in melt overflow in a large number.200810050792.8 patent application has proposed under the normal pressure high nitrogen ferrochrome is added the method for Fe-Mn melt smelting high-nitrogen steel, 201210458675.1 patent application has also proposed under the normal pressure nitrogenized manganese is added the method for Fe-Cr melt smelting high-nitrogen steel, makes to produce and become possibility under high nitrogen steel normal pressure.But at high nitrogen steel ingot, in foundry goods and processing process, can produce many high nitrogen steel waste materials (as cast rising head material, the feed trumpet material, stub bar, cutting, waste casting, waste product etc.), as it not melted down and again obtains the high nitrogen steel of higher nitrogen content, will reduce waste materials recycle and be worth and cause the waste material waste, and experiment shows that these high nitrogen steel waste materials have a large amount of nitrogen and overflow under normal pressure when refuse is solidified or be blended into new molten steel, the nitrogen content of the high nitrogen steel that obtains is significantly reduced (generally being down to 0.5wt% following), thereby reduced the nitrogen content grade of high nitrogen steel.
Summary of the invention
The object of the present invention is to provide a kind of method of remelting high-strength stainless steel, the high nitrogen steel melting method that it can make high nitrogen steel waste materials recycle remelting and obtain higher nitrogen content; It is that first melting partly contains the strong suction nitrogen alloy melt of inhaling the nitrogen element such as a large amount of manganese, chromium and molybdenum, again high nitrogen steel waste material is progressively joined under lower melt temperature and inhale in the nitrogen alloy melt, can make like this nitrogen in high nitrogen steel waste material contact with melt suction nitrogen element in time when waste material melts and dissolve in melt, thereby greatly reduce the formation of nitrogen, (do not comprise waste material by high nitrogen steel virgin material more subsequently, down together) composition proportion is allocated corresponding nitrogen-containing alloy into, obtains the high nitrogen steel of high nitrogen-containing.
Technical scheme of the present invention is achieved in that a kind of method of remelting high-strength stainless steel, it is characterized in that: the Fe-Mn-Cr that first melting contains manganese and chromium inhales the nitrogen alloy melt, then under lower melt temperature, high nitrogen steel waste material is progressively joined and inhale in the nitrogen alloy melt, allocate nitrogen-containing alloy into by the high nitrogen composition of steel proportioning of design again, until melt fully and evenly after the cast of coming out of the stove, concrete steps are as follows:
1) first melting Fe-Mn-Cr inhales the nitrogen alloy melt: metallic iron and extra low carbon ferrochromium are added in smelting furnace after heat fused is fusant or iron-chromium melt, add again manganese metal, form iron-manganese melt or iron-manganese-chromium melt, wherein the metallic iron consumption adds 30～50wt% by high nitrogen steel virgin material composition proportion, the manganese metal addition adds 10～25wt% by high nitrogen steel virgin material composition proportion, and the extra low carbon ferrochromium addition adds 0-20wt% by high nitrogen steel virgin material composition proportion; After forming melt, all solid-state material fusings keep melt temperature in 1450 ℃～1550 ℃ scopes;
2) high nitrogen steel waste material is joined one or more times and inhale in the nitrogen alloy melt, its weight of adding high nitrogen steel waste material is 1/5-3 times of high nitrogen steel virgin material weight, and adding procedure keeps melt temperature in 1450 ℃～1550 ℃ scopes;
3) add nitrogen-containing alloy, interpolation speed≤300kg/min to the melt that fuses into high nitrogen steel waste material; Nitrogen-containing alloy comprises nitrided ferro-chromium, high nitrogen ferrochrome, nitrogenized manganese, wherein: the nitrided ferro-chromium addition adds 10～35wt% by high nitrogen steel virgin material composition proportion, the high nitrogen ferrochrome addition adds 0-25wt% by high nitrogen steel virgin material composition proportion, and the nitrogenized manganese addition adds 0-10wt% by high nitrogen steel virgin material composition proportion; Adding procedure keeps melt temperature in 1450 ℃～1550 ℃ scopes;
4) after melting fully, solid-state material in melt continues uniform stirring 0～15min, the cast of coming out of the stove after then temperature being risen to 1550 ℃～1650 ℃ fast.
The melt temperature of the high nitrogen steel of described interpolation waste material process remains in 1450 ℃～1500 ℃ scopes.
The described interpolation speed≤200kg/min that adds nitrogen-containing alloy to melt.
The described melt temperature to melt interpolation nitrogen-containing alloy process remains in 1450 ℃～1500 ℃ scopes.
Described metallic iron is technically pure iron or is the soft steel of carbon content≤0.1wt%.
Carbon content≤the 0.1wt% of described extra low carbon ferrochromium, chromium content is 60～70wt%.
Described nitrogen-containing alloy, the chromium content of its nitrided ferro-chromium is 60～70 wt%, and the chromium content of high nitrogen ferrochrome is 60～70 wt%, and the manganese content of nitrogenized manganese is about 90 wt%.
Except adding to melt above-mentioned alloy, also can add to melt alloy or the metal of other element, total addition level adds 0～8wt% by high nitrogen steel virgin material composition proportion; Its principal element content is: molybdenum≤5.0wt%, niobium≤0.5wt%, copper≤3.0wt%, titanium≤0.5wt%, vanadium≤0.5wt%, rare earth≤0.5wt%.
The de-S of described smelting process, de-P, de-O and slag making, deslagging method are conventional steel-making working method.
Positively effect of the present invention is to have solved the high nitrogen steel waste materials recycle not enough problem of melting nitrogen content again, the nitrogen content that can to control with the melting of high nitrogen steel waste material be new peak nitrogen steel, and its nitrogen content can approach or be not less than the nitrogen content of former high nitrogen steel waste material.
Embodiment
Below in conjunction with embodiment, the present invention will be further described:
Test is technically pure iron (C≤0.05wt%), high nitrogen ferrochrome (N=8wt% with material, Cr=60wt%), nitrided ferro-chromium (N=3wt%, Cr=60wt%), extra low carbon ferrochromium (C=0.03wt%, Cr=60wt%), nitrogenized manganese (N=7wt%, Mn=90wt%), electrolytic metal Mn (Mn >=98wt%); High nitrogen steel waste material (C=0.03wt%, N=0.85wt%, Mn=18wt%, Cr=20wt%, Mo=1.0wt%, Fe=58wt%, surplus is other element).
Test is adopted as a 5T medium-frequency induction furnace with smelting furnace; The about 5000kg of each test high nitrogen steel weight of preparation.
Test design new peak nitrogen composition of steel is: C≤0.05wt%, and Cr=18～20wt%, Mn=15～18wt%, N >=0.8wt%, other element≤3wt% such as Mo, Si, S, P, surplus is Fe;
Embodiment 1
Get high nitrogen steel waste material 3700kg; Prepare the about 1300kg of high nitrogen steel virgin material, technically pure iron 610kg wherein, nitrided ferro-chromium 160kg, high nitrogen ferrochrome 110kg, extra low carbon ferrochromium 160kg, electrolytic metal Mn 240kg, nitrogenized manganese 20kg.
Concrete melting step:
1) add whole technically pure irons and extra low carbon ferrochromium to medium-frequency induction furnace, add whole electrolytic metal Mns after melting, adjusting its melt temperature is 1450 ℃;
2) progressively add high nitrogen steel waste material in stove, keep 1450 ℃ of melt temperatures, until all melt for melt;
3) progressively add high nitrogen ferrochrome in stove, interpolation speed is 100kg/min, keeps 1450 ℃ of melt temperatures;
4) progressively add nitrided ferro-chromium in stove, interpolation speed is 100kg/min, keeps 1450 ℃ of melt temperatures;
5) progressively add nitrogenized manganese in stove, interpolation speed is 50kg/min, keeps 1450 ℃ of melt temperatures;
6) after nitrogen-containing alloy has all added, keeping melt temperature is 1450 ℃, after utilizing the function composite by electromagnetic stirring of intermediate frequency furnace to stir 1min, melt temperature is risen to 1600 ℃ of also deoxidation cast that sampled and come out of the stove after slagging tap simultaneously.
Detection obtains high nitrogen steel 4953kg, detects its main chemical compositions and is: C=0.034wt%, and Cr=19.6wt%, Mn=17.6wt%, N=0.85wt%, Fe=59.0wt%, remaining is other element.
Embodiment 2
Get high nitrogen steel waste material 1000kg; Prepare the about 4000kg of high nitrogen steel virgin material, technically pure iron 1870kg wherein, nitrided ferro-chromium 1330kg, electrolytic metal Mn 650kg, nitrogenized manganese 150kg.
The melting step:
1) add whole technically pure irons to medium-frequency induction furnace, add whole electrolytic metal Mns after melting, adjusting its melt temperature is between 1500 ℃;
2) progressively add high nitrogen steel waste material in stove, keep 1500 ℃ of melt temperatures, until all melt for melt;
3) progressively add nitrided ferro-chromium in stove, interpolation speed is 300kg/min, keeps 1500 ℃ of melt temperatures;
4) progressively add nitrogenized manganese in stove, interpolation speed is 100kg/min, keeps 1500 ℃ of melt temperatures;
5) after nitrogen-containing alloy has all added, keeping melt temperature is 1500 ℃, after utilizing the function composite by electromagnetic stirring of intermediate frequency furnace to stir 1min, melt temperature is risen to 1650 ℃ of also deoxidation cast that sampled and come out of the stove after slagging tap simultaneously.
Detection obtains high nitrogen steel 4960kg, detects its main chemical compositions and is: C=0.031wt%, and Cr=19.3wt%, Mn=17.7wt%, N=0.81wt%, Fe=58.5wt%, remaining is other element.
Embodiment 3
Get high nitrogen steel waste material 2500kg; Prepare the about 2500kg of high nitrogen steel virgin material, technically pure iron 610kg wherein, nitrided ferro-chromium 490kg, high nitrogen ferrochrome 160kg, extra low carbon ferrochromium 140kg, electrolytic metal Mn 500kg.
The melting step:
1) add whole technically pure irons and extra low carbon ferrochromium to medium-frequency induction furnace, add whole electrolytic metal Mns after melting, adjusting its melt temperature is between 1480 ℃;
2) progressively add high nitrogen steel waste material in stove, keep between 1550 ℃ of melt temperatures, until all melt for melt;
3) progressively add high nitrogen ferrochrome in stove, interpolation speed is 100kg/min, keeps 1550 ℃ of melt temperatures;
4) progressively add nitrided ferro-chromium in stove, interpolation speed is 200kg/min, keeps 1550 ℃ of melt temperatures;
5) after nitrogen-containing alloy has all added, keeping melt temperature is 1550 ℃, after utilizing the function composite by electromagnetic stirring of intermediate frequency furnace to stir 1min, melt temperature is risen to 1600 ℃ of also deoxidation cast that sampled and come out of the stove after slagging tap simultaneously.
Detection obtains high nitrogen steel 4956kg, detects its main chemical compositions and is: C=0.035wt%, and Cr=18.5wt%, Mn=17.2wt%, N=0.84wt%, Fe=60.4wt%, remaining is other element.
Can find out from above-described embodiment, with the high nitrogen base steel that high nitrogen steel waste materials recycle melting is again obtained of the present invention, originally guarantee higher nitrogen content, and guarantee that Cr, Mn content are in the scope of design.
Claims (7)
1. the method for a remelting high-strength stainless steel, it is characterized in that: the Fe-Mn-Cr that first melting contains manganese and chromium inhales the nitrogen alloy melt, then under lower melt temperature, high nitrogen steel waste material is progressively joined and inhale in the nitrogen alloy melt, allocate nitrogen-containing alloy into by the high nitrogen composition of steel proportioning of design again, until melt fully and evenly after the cast of coming out of the stove, wherein concrete steps are as follows:
1) first melting Fe-Mn-Cr inhales the nitrogen alloy melt: metallic iron and extra low carbon ferrochromium are added in smelting furnace after heat fused is fusant or iron-chromium melt, add again manganese metal, form iron-manganese melt or iron-manganese-chromium melt, wherein the metallic iron consumption adds 30～50wt% by high nitrogen steel virgin material composition proportion, the manganese metal addition adds 10～25wt% by high nitrogen steel virgin material composition proportion, and the extra low carbon ferrochromium addition adds 0-20wt% by high nitrogen steel virgin material composition proportion; After forming melt, all solid-state material fusings keep melt temperature in 1450 ℃～1550 ℃ scopes;
2) high nitrogen steel waste material is joined one or more times and inhale in the nitrogen alloy melt, it adds 1/5-3 times that high nitrogen steel waste material weight is high nitrogen steel virgin material weight, and adding procedure keeps melt temperature in 1450 ℃～1550 ℃ scopes;
3) add nitrogen-containing alloy, interpolation speed≤300kg/min to the melt that fuses into high nitrogen steel waste material; Nitrogen-containing alloy comprises nitrided ferro-chromium, high nitrogen ferrochrome, nitrogenized manganese, wherein: the chromium nitride addition adds 10～35wt% by high nitrogen steel virgin material composition proportion, the high nitrogen ferrochrome addition adds 0-25wt% by high nitrogen steel virgin material composition proportion, and the nitrogenized manganese addition adds 0-10wt% by high nitrogen steel virgin material composition proportion; Adding procedure keeps melt temperature in 1450 ℃～1550 ℃ scopes;
4) after melting fully, solid-state material in melt continues uniform stirring 0～15min, the cast of then coming out of the stove after fast temperature to 1550 ℃～1650 ℃.
2. the method for a kind of remelting high-strength stainless steel according to claim 1, is characterized in that the melt temperature of the high nitrogen steel of described interpolation waste material process remains in 1450 ℃～1500 ℃ scopes.
3. the method for a kind of remelting high-strength stainless steel according to claim 1, is characterized in that the described interpolation speed≤200kg/min that adds nitrogen-containing alloy to melt.
4. the method for a kind of remelting high-strength stainless steel according to claim 1, is characterized in that the described melt temperature to melt interpolation nitrogen-containing alloy process remains in 1450 ℃～1500 ℃ scopes.
5. the method for a kind of remelting high-strength stainless steel according to claim 1, is characterized in that described metallic iron is technically pure iron or is the soft steel of carbon content≤0.1wt%.
6. the method for a kind of remelting high-strength stainless steel according to claim 1, is characterized in that the carbon content≤0.1wt% of described extra low carbon ferrochromium, and chromium content is 60～70wt%.
7. the method for a kind of remelting high-strength stainless steel according to claim 1, is characterized in that described nitrogen-containing alloy, and the chromium content of its nitrided ferro-chromium is 60～70 wt%, and the chromium content of high nitrogen ferrochrome is 60～70 wt%, and the manganese content of nitrogenized manganese is about 90 wt%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110343815A (en) * | 2018-04-08 | 2019-10-18 | 吉林常春高氮合金研发中心有限公司 | A method of improving useless high nitrogen steel mechanical property |
| CN112921251A (en) * | 2021-01-23 | 2021-06-08 | 青岛浦友精密金属有限公司 | Nickel-saving high-performance stainless steel raw material composition |
| CN115401216A (en) * | 2022-09-21 | 2022-11-29 | 华北理工大学 | Method for preparing high-nitrogen stainless steel by selective laser melting of alloy over-mixed powder |
| CN115446331A (en) * | 2022-09-21 | 2022-12-09 | 华北理工大学 | Method for preparing high-nitrogen stainless steel by selective laser melting of pure metal over-mixed powder |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3402756A (en) * | 1964-05-12 | 1968-09-24 | Frehser Josef | Process of producing high-nitrogen alloy steel |
| CN101250662A (en) * | 2008-03-24 | 2008-08-27 | 二重集团（德阳）重型装备股份有限公司 | Method for smelting high-nitrogen steel |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3402756A (en) * | 1964-05-12 | 1968-09-24 | Frehser Josef | Process of producing high-nitrogen alloy steel |
| CN101250662A (en) * | 2008-03-24 | 2008-08-27 | 二重集团（德阳）重型装备股份有限公司 | Method for smelting high-nitrogen steel |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110343815A (en) * | 2018-04-08 | 2019-10-18 | 吉林常春高氮合金研发中心有限公司 | A method of improving useless high nitrogen steel mechanical property |
| CN112921251A (en) * | 2021-01-23 | 2021-06-08 | 青岛浦友精密金属有限公司 | Nickel-saving high-performance stainless steel raw material composition |
| CN115401216A (en) * | 2022-09-21 | 2022-11-29 | 华北理工大学 | Method for preparing high-nitrogen stainless steel by selective laser melting of alloy over-mixed powder |
| CN115446331A (en) * | 2022-09-21 | 2022-12-09 | 华北理工大学 | Method for preparing high-nitrogen stainless steel by selective laser melting of pure metal over-mixed powder |
| CN115401216B (en) * | 2022-09-21 | 2024-03-05 | 华北理工大学 | Method for preparing high-nitrogen stainless steel by alloy powder passing through selective laser melting |
| CN115446331B (en) * | 2022-09-21 | 2024-03-05 | 华北理工大学 | Method for preparing high-nitrogen stainless steel by laser melting of pure metal powder through selected area |
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