CN103484599B - Smelting method of high-manganese wear-resistant steel - Google Patents
Smelting method of high-manganese wear-resistant steel Download PDFInfo
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Abstract
The invention discloses a smelting method of high-manganese wear-resistant steel. In the smelting process, abundant alloy is molten in an intermediate frequency furnace and mixed with crude molten steel smelted in a converter to obtain Mn13 steel. Compared with the smelting method of directly adding solid alloy into the molten steel, the method disclosed by the invention shortens the smelting time, lowers the P and S contents in the finished product, and can implement multi-furnace continuous casting. Since the burning loss of precious metals is low in the intermediate frequency furnace, the molten steel subjected to deep deoxidation in the intermediate frequency furnace enhances the recovery rates of precious metal elements, such as Cr, Mn and the like, thereby lowering the production cost.
Description
Technical field
The present invention relates to a kind of smelting process of high manganese wear-resistant steel, belong to metallurgical technology field.
Background technology
High manganese wear-resistant steel Mn13 has the incomparable Work Hardening Characteristic of other high-abrasive material, in greater impact load or compared with under the effect of large contacting stress, steel plate top layer produces work hardening, surface hardness rises to more than HB500 rapidly by HB200, thus produce the upper layer of high abrasion, and steel plate internal layer austenite still keeps good impelling strength.Become high-abrasive material first-selected in the sophisticated equipments such as magnetic suspension train, strong box, bullet-proof car, problem of rock-drilling robot, new type tank.
Succeed in developing up to the present from Mn13 in 2002 is domestic, mainly rely on electric arc furnace smelting, smelting process alloy adds in electric furnace, and main metal element (Cr, Mn etc.) rate of recovery is low; Production cycle is long, and cost is high, and product competitiveness is low.
Summary of the invention
In order to overcome above-mentioned deficiency, the present invention aims to provide a kind of smelting process of high manganese wear-resistant steel, makes high manganese wear-resistant steel Mn13 shorten smelting cycle, reduces finished product P, S content, improves the rate of recovery of main metal element Cr, Mn etc., thus reduce production cost.
The GB component requirements of Mn13 of the present invention is:
C：0.90-1.20%、Si: 0.30-0.80%、Mn: 11.00-14.00%、P≤0.035%、S≤0.030%，
For ensureing the performance of Mn13, also need to add a certain amount of Cr, Mo and V element in actual production process, its span of control is:
Cr：0.60-1.00%、Mo：0.05-0.15%、V：0.05-0.15%
All the other are Fe and inevitable material.
The smelting process of a kind of high manganese wear-resistant steel provided by the invention, processing step is: converter+intermediate frequency furnace smelting, LF ladle refining, RH are degassed, continuous casting, it is characterized in that: concrete operation steps is as follows:
1. converter+intermediate frequency furnace is smelted
Desulfurization process, the molten iron after desulfurization and iron quality per-cent are:
C:3.8-4.2%, Si:0.30-0.60%, Mn:0.30 ± 0.01%, P:0.070 ± 0.002%, S≤0.005%, all the other are Fe and inevitable material;
Blast-meltedly after desulfurization process, be blended into converter, add the desulfurization pig iron of massfraction 10% simultaneously, smelt by normal smelting process, before smelting endpoint, pour out more than 50% slag, then add 500kg iron ore and 1.5 tons of lime points blow 1 minute, tapping after sampling analysis P≤0.005%, tapping process adds aluminum shot and ferrosilicon, and wherein the add-on of aluminum shot is 2.5kg/t, and the add-on of ferrosilicon is 8.1kg/t, converter tapping process pushing off the slag, slag is thick≤50mm; After converter tapping, composition is:
C：0.10-0.15、Si：0.40-0.60、Mn：0.05-0.15、P≤0.010、S≤0.007、Cr：0.01-0.05、Mo：0.10-0.20、V：0.10-0.20；
During converter smelting, with intermediate frequency furnace by high carbon ferro-chrome and electrolytic metal Mn fusing, wherein the add-on of high carbon ferro-chrome is 12.3kg/t, and the composition of high carbon ferro-chrome is:
C:6.0-7.9%, Si:1.0-1.5%, Cr:58-61%, P:0.020-0.030%, S:0.020-0.030%, all the other are Fe and inevitable material;
Wherein the add-on of electrolytic metal Mn is 140 kg/t; Electrolytic metal Mn composition is: Mn:99.7-99.9%, and all the other are inevitable material;
Alloy molten solution after fusing mixes with converter crude molten steel, and after mixing, molten steel component is:
C：0.17-0.24%、Si：0.40-0.60%、Mn：11.5-12.5%、P≤0.013%、S≤0.010%、Cr：0.65-0.85%、Mo：0.05-0.15%、V：0.05-0.15%
2. LF ladle refining
Alloy molten solution after fusing mixes with converter crude molten steel.Mixed molten steel is transported to the refining of LF stove, adjustment carbon component, to arrive RH after Mn13 standard-required degassed to meeting completely to finely tune other compositions; Molten steel component is:
C:0.90-1.20%, Si:0.30-0.80%, Mn:11.00-14.00%, P≤0.035%, S≤0.030%, Cr:0.60-1.00%, Mo:0.05-0.15%, V:0.05-0.15%, all the other are Fe and inevitable material;
3. RH is degassed
Molten steel arrives after RH, and evacuation cycle 3 minutes thermometrics, sampling, under vacuum tightness is less than 10mbar, cycling time is greater than 10 minutes, thermometric, broken empty, for continuous casting.
4. continuous casting
Calm 5-8 minute after molten steel to continuous casting yoke, opens and waters, and for 220mm thickness steel billet, cooling twice water consumption is 530L/t steel, and casting speed is 0.8-1.0m/min.
Beneficial effect of the present invention: the present invention owing to melt a large amount of alloys smelted needed for Mn13 afterwards and converter slightly refines mixing of molten steel in intermediate frequency furnace, shorten the Electric furnace steel making time, improve alloy recovery, shorten to 45min tap to tap time completely, continuous casting sequence casting can be realized; Mn, Cr rate of recovery reaches 96%, and finished product P drops to less than 0.020%.
Embodiment
Further illustrate the present invention below by embodiment, but be not limited to following examples.
embodiment 1:
Have 30 tons of intermediate frequency furnaces one, melting the cycle when melted alloy expires stove is 60min, and when staying steel 50%, the fusing cycle is 40min; Separately have 80t converter 3, when smelting Mn13, Composition Control is as follows:
C：0.95-1.15%、Si: 0.40-0.70%、Mn: 11.50-13.50%、P≤0.020%、S≤0.010%，Cr：0.60-1.00%、Mo：0.05-0.15%、V：0.05-0.15%
(1) the high carbon ferro-chrome composition smelting Mn13 use is
C:7.0%, Si:1.0%, Cr:60%, P:0.025%, S:0.020%, all the other are Fe and inevitable material;
Electrolytic metal Mn composition is: Mn:99.7%, and all the other are inevitable material;
Intermediate frequency furnace fusing is filled in the ratio of 1 ton of high carbon ferro-chrome, 10 tons of electrolytic metal Mns;
Actual enter intermediate frequency furnace high carbon ferro-chrome 0.993t, electrolytic metal Mn 10.007t.
(2) the molten iron 69.8t after the rear converter loading desulfurization in 20 minutes of intermediate frequency furnace power transmission and the pig iron 8.1t after desulfurization, start normally to smelt, the hot metal composition after desulfurization is:
C:4.1%, Si:0.45%, Mn:0.29%, P:0.070%, S:0.003%, all the other are Fe and inevitable material;
The composition of the pig iron is:
C:3.9%, Si:0.40%, Mn:0.31%, P:0.071%, S:0.003%, all the other are Fe and inevitable material.
More than 50% slag is poured out before smelting endpoint, then add 497Kg iron ore and 1.50 tons of lime points blow 1 minute, tap after sampling analysis P=0.005%, tapping process adds aluminum shot 205kg, ferrosilicon 665 kg, carbon dust 100kg, molybdenum-iron and vanadium iron, converter tapping process pushing off the slag, slag is thick≤50mm;
Converter tapping quantity 71.1 tons, after tapping, composition is:
C：0.15%、Si：0.60%、Mn：0.06%、P：0.006%、S：0.006%、Cr：0.01%、Mo：0.13%、V：0.12%；
(3) after tapping, molten steel is transported to intermediate frequency furnace tapping position, intermediate frequency furnace mixing solutions 11.001 tons goes out in converter ladle, tapping process Bottom Argon Stirring, and stir by force after tapping after 5 minutes and sample, composition is:
C：0.23%、Si：0.52%、Mn：11.72%、P：0.006%、S：0.006%、Cr：0.70%、Mo：0.11%、V：0.11%；
(4) mixing liquid is transported to LF and adjusts carbon component, adjustment temperature, be then transported to RH degassed, the Mn13 composition after RH process is:
C：1.02%、Si：0.50%、Mn：11.70%、P：0.006%、S：0.006%、Cr：0.70%、Mo：0.11%、V：0.11%；
(5) fill intermediate frequency furnace 11 tons in the ratio of 1 ton of high carbon ferro-chrome, 10 tons of electrolytic metal Mns after intermediate frequency furnace tapping, continue fusing and smelt next stove Mn13.
embodiment 2:
Have 30 tons of intermediate frequency furnaces one, melting the cycle when melted alloy expires stove is 60min, and when staying steel 50%, the fusing cycle is 40min; Separately have 80t converter 3, when smelting Mn13, Composition Control is as follows:
C：0.95-1.15%、Si: 0.40-0.70%、Mn: 11.50-13.50%、P≤0.020%、S≤0.010%，Cr：0.60-1.00%、Mo：0.05-0.15%、V：0.05-0.15%
(1) the high carbon ferro-chrome composition smelting Mn13 use is
C:6.8%, Si:1.2%, Cr:59%, P:0.022%, S:0.020%, all the other are Fe and inevitable material;
Electrolytic metal Mn composition is: Mn:99.7%, and all the other are inevitable material;
Intermediate frequency furnace fusing is filled in the ratio of 1 ton of high carbon ferro-chrome, 10 tons of electrolytic metal Mns;
Actual enter intermediate frequency furnace high carbon ferro-chrome be 1.015t, electrolytic metal Mn is 10.043t.
(2) the molten iron 70.4t after the rear converter loading desulfurization in 20 minutes of intermediate frequency furnace power transmission and the pig iron 8.1t after desulfurization, start normally to smelt, the hot metal composition after desulfurization is:
C:4.1%, Si:0.47%, Mn:0.29%, P:0.068%, S:0.003%, all the other are Fe and inevitable material;
The composition of the pig iron is:
C:3.9%, Si:0.40%, Mn:0.30%, P:0.072%, S:0.003%, all the other are Fe and inevitable material.
More than 50% slag is poured out before smelting endpoint, then add 520kg iron ore and 1.51 tons of lime points blow 1 minute, tap after sampling analysis P=0.004%, tapping process adds aluminum shot 210kg, ferrosilicon 672 kg, carbon dust 100kg, molybdenum-iron and vanadium iron, converter tapping process pushing off the slag, slag is thick≤50mm;
Converter tapping quantity 71.4 tons, after tapping, composition is:
C：0.13%、Si：0.60%、Mn：0.05%、P：0.005%、S：0.005%、Cr：0.01%、Mo：0.12%、V：0.11%；
(3) after tapping, molten steel is transported to intermediate frequency furnace tapping position, intermediate frequency furnace mixing solutions 10.984 tons goes out in converter ladle, tapping process Bottom Argon Stirring, and stir by force after tapping after 5 minutes and sample, composition is:
C：0.22%、Si：0.54%、Mn：11.70%、P：0.006%、S：0.006%、Cr：0.69%、Mo：0.10%、V：0.10%；
(4) mixing liquid is transported to LF and adjusts carbon component, adjustment temperature, be then transported to RH degassed, the Mn13 composition after RH process is:
C：1.05%、Si：0.53%、Mn：11.68%、P：0.006%、S：0.006%、Cr：0.70%、Mo：0.11%、V：0.11%；
(5) fill intermediate frequency furnace 11 tons in the ratio of 1 ton of high carbon ferro-chrome, 10 tons of electrolytic metal Mns after intermediate frequency furnace tapping, continue fusing and smelt next stove Mn13.
Claims (1)
1. a smelting process for high manganese wear-resistant steel, processing step is: converter+intermediate frequency furnace smelting, LF ladle refining, RH are degassed, continuous casting, it is characterized in that: concrete operation steps is as follows:
1. converter+intermediate frequency furnace is smelted
Desulfurization process, the molten iron after desulfurization and iron quality per-cent are:
C:3.8-4.2%, Si:0.30-0.60%, Mn:0.30 ± 0.01%, P:0.070 ± 0.002%, S≤0.005%, all the other are Fe and inevitable material;
Blast-meltedly after desulfurization process, be blended into converter, add the desulfurization pig iron of massfraction 10% simultaneously, smelt by normal smelting process, before smelting endpoint, pour out more than 50% slag, then add 500kg iron ore and 1.5 tons of lime points blow 1 minute, tapping after sampling analysis P≤0.005%, tapping process adds aluminum shot and ferrosilicon, and wherein the add-on of aluminum shot is 2.5kg/t, and the add-on of ferrosilicon is 8.1kg/t, converter tapping process pushing off the slag, slag is thick≤50mm; After converter tapping, composition is:
C：0.10-0.15、Si：0.40-0.60、Mn：0.05-0.15、P≤0.010、S≤0.007、Cr：0.01-0.05、Mo：0.10-0.20、V：0.10-0.20；
During converter smelting, with intermediate frequency furnace by high carbon ferro-chrome and electrolytic metal Mn fusing, wherein the add-on of high carbon ferro-chrome is 12.3kg/t, and the composition of high carbon ferro-chrome is:
C:6.0-7.9%, Si:1.0-1.5%, Cr:58-61%, P:0.020-0.030%, S:0.020-0.030%, all the other are Fe and inevitable material;
Wherein the add-on of electrolytic metal Mn is 140 kg/t; Electrolytic metal Mn composition is: Mn:99.7-99.9%, and all the other are inevitable material;
Alloy molten solution after fusing mixes with converter crude molten steel, and after mixing, molten steel component is:
C：0.17-0.24%、Si：0.40-0.60%、Mn：11.5-12.5%、P≤0.013%、S≤0.010%、Cr：0.65-0.85%、Mo：0.05-0.15%、V：0.05-0.15%
2. LF ladle refining
Mixed molten steel is transported to the refining of LF stove, adjustment carbon component, to arrive RH after Mn13 standard-required degassed to meeting completely to finely tune other compositions; Molten steel component is: C:0.90-1.20%, Si:0.30-0.80%, Mn:11.00-14.00%, P≤0.035%, S≤0.030%, Cr:0.60-1.00%, Mo:0.05-0.15%, V:0.05-0.15%, and all the other are Fe and inevitable material;
3. RH is degassed
Molten steel arrives after RH, evacuation cycle 3 minutes thermometrics, sampling, and under vacuum tightness is less than 10mbar, cycling time is greater than 10 minutes, thermometric, broken empty, for continuous casting;
4. continuous casting
Calm 5-8 minute after molten steel to continuous casting yoke, opens and waters, and for 220mm thickness steel billet, secondary cooling water is 530L/t steel, and casting speed is 0.8-1.0m/min.
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| CN105499269A (en) | 2015-12-14 | 2016-04-20 | 宝山钢铁股份有限公司 | Dual-hardness clad steel plate and production method thereof |
| CN112708725A (en) * | 2020-12-03 | 2021-04-27 | 河钢股份有限公司 | Method for smelting high manganese steel by vacuum induction furnace |
| CN112853194B (en) * | 2021-01-06 | 2022-05-13 | 鞍钢股份有限公司 | Nitrogen-controllable vanadium alloying method for high manganese steel |
| CN114427014B (en) * | 2022-01-18 | 2023-02-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Smelting method of high-manganese non-magnetic steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101191180A (en) * | 2006-11-21 | 2008-06-04 | 鞍钢集团矿业公司 | Ultra-high performance wearable high-manganese steel and producing method thereof |
| CN101838718A (en) * | 2010-04-02 | 2010-09-22 | 温州开诚机械有限公司 | Medium frequency furnace internal dephosphorization and desulfurization smelting process |
| CN101956141A (en) * | 2010-10-08 | 2011-01-26 | 莱芜钢铁股份有限公司 | Low-cost non-quenched and tempered high-strength wear-resistant steal plate with yield strength of 780 MPa grade and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101191180A (en) * | 2006-11-21 | 2008-06-04 | 鞍钢集团矿业公司 | Ultra-high performance wearable high-manganese steel and producing method thereof |
| CN101838718A (en) * | 2010-04-02 | 2010-09-22 | 温州开诚机械有限公司 | Medium frequency furnace internal dephosphorization and desulfurization smelting process |
| CN101956141A (en) * | 2010-10-08 | 2011-01-26 | 莱芜钢铁股份有限公司 | Low-cost non-quenched and tempered high-strength wear-resistant steal plate with yield strength of 780 MPa grade and manufacturing method thereof |
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