CN103388099B - A kind of method of dephosphorization molten iron smelting austenitic stainless steel - Google Patents
A kind of method of dephosphorization molten iron smelting austenitic stainless steel Download PDFInfo
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- CN103388099B CN103388099B CN201310343613.0A CN201310343613A CN103388099B CN 103388099 B CN103388099 B CN 103388099B CN 201310343613 A CN201310343613 A CN 201310343613A CN 103388099 B CN103388099 B CN 103388099B
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Abstract
The present invention relates to a kind of method of dephosphorization molten iron smelting austenitic stainless steel, it comprises following step: <b> I </b>. medium-frequency induction furnace fusing nickel-base alloy becomes the mass percent of Ni, P of pre-solution nickel-base alloy to be: Ni=4 ~ 99.5, P≤0.045; <b> II </b> hot metal pretreatment provides the mass percent of C, P of dephosphorization dephosphorization of molten iron molten iron to require: C=2.5 ~ 4.0, P≤0.01; <b> III </b>. dephosphorization molten iron and pre-solution are blended into KOBMS to carry out blowing after nickel-base alloy that medium-frequency induction furnace melts mixes with dephosphorization molten iron and is blended into KOBMS, in KOBMS, carry out oxygen decarburization melting; <b> IV </b>.VOD blows, adjusting component VOD goes out composition of steel according to KOBMS and blows, and carries out alloying adjustment according to steel grades.<b> V </b>.LF refining LF adjusting component, adjustment temperature are to target outbound temperature.Shorten the stainless steel smelting austenitic time by the method for dephosphorization molten iron smelting austenitic stainless steel, improve stainless steel operating rate.
Description
Technical field
The present invention relates to a kind of method of dephosphorization molten iron smelting austenitic stainless steel.
Background technology
Electric energy melting stainless steel raw material is utilized to be the main method of smelting austenitic stainless steel, and using dephosphorization molten iron smelting stainless steel to be also another major technique developed in recent years, its principal feature is that use is blast-melted through dephosphorization smelting stainless steel in stainless converter.But dephosphorization molten iron smelting stainless steel in stainless steel mainly exists the solid-state cold burden of process to add excessive, and the stainless steel smelting austenitic time is long, causes smelting cycle longer, and consume higher, stainless steel operating rate is low.
Summary of the invention
In order to overcome the above-mentioned deficiency of the method for existing dephosphorization molten iron smelting austenitic stainless steel, the invention provides a kind of shortening stainless steel smelting austenitic time, improving the method with dephosphorization molten iron smelting austenitic stainless steel of stainless steel operating rate.
Design of the present invention is that the nickel raw material used in producing stainless steel process mainly contains pure nickel, high-grade nickel, ferronickel and the chromium nickel pig iron, utilizes the Ni-based raw material of intermediate frequency furnace melting to provide pre-solution for stainless steel, can shorten stainless steel tap to tap time.The consumption of temperature raising ferrosilicon can be reduced simultaneously, and then reduce the usage quantity of slag material.The present invention can give full play to each operation equipment advantage, utilize pre-treatment to carry out dephosphorization and intermediate frequency furnace nickel-base alloy, both can reduce phosphorus content in molten steel, and also utilize intermediate frequency furnace thermal source, decrease the temperature drop in stainless steel smelting process, shorten the smelting cycle of converter.
The method of this use dephosphorization molten iron smelting austenitic stainless steel comprises following step successively:
imedium-frequency induction furnace fusing nickel-base alloy becomes pre-solution;
iIhot metal pretreatment provides dephosphorization molten iron;
iIIdephosphorization molten iron and pre-solution are blended into KOBMS and blow;
iVvOD blowing, adjusting component;
vlF refining.
The method of above-mentioned dephosphorization molten iron smelting austenitic stainless steel, its steps characteristic is:
imedium-frequency induction furnace fusing nickel-base alloy becomes pre-solution
The mass percent of Ni, P of nickel-base alloy is:
Ni=4%～99.5%，P≤0.045%；
All the other are inevitable impurity;
Intermediate frequency furnace tapping temperature is 1550 ~ 1680 DEG C;
iIhot metal pretreatment provides dephosphorization molten iron
The mass percent of C, P of dephosphorization molten iron requires:
C=2.5%～4.0%；P≤0.01%；
Processing molten iron temperature is 1250 ~ 1380 DEG C;
iIIdephosphorization molten iron and pre-solution are blended into KOBMS and blow
Be blended into KOBMS after the nickel-base alloy that medium-frequency induction furnace melts mixes with dephosphorization molten iron, in KOBMS, carry out oxygen decarburization melting, carry out alloying adjustment according to steel grades.
iVvOD blowing, adjusting component
VOD goes out composition of steel according to KOBMS and blows, and carries out alloying adjustment according to steel grades
vlF refining
LF adjusting component, adjustment temperature are to target outbound temperature.
The method of above-mentioned dephosphorization molten iron smelting austenitic stainless steel, its steps characteristic is: the Ni-based Ni content in step I is the content needs according to smelting Ni in steel grade finished product; Matching principle is after the pre-solution of intermediate frequency furnace fusing is blended into KOBMS, and KOBMS only needs the adjustment variable quantity of trace adjustment Ni, Ni 1% ~ 4%.
The present invention can give full play to each operation equipment advantage, pre-treatment is utilized to carry out dephosphorization and intermediate frequency furnace nickel-base alloy, both phosphorus content in molten steel can be reduced, also utilize intermediate frequency furnace thermal source, decrease the temperature drop in stainless steel smelting process, shorten the smelting cycle of converter, reduce KOBMS and consume.Reduce the consumption of alloy, auxiliary material.Make stainless steel shorten 10min ~ 15min tap to tap time, ferrosilicon, supplementary product onsumption reduce 20 ~ 30%.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.Those skilled in the art belongs to protection scope of the present invention what do not obtain under performing creative labour with by the technical scheme of nickel-base alloy and dephosphorization molten iron smelting austenitic stainless steel.
embodiment one
The steel grade that the present embodiment is smelted is SUS304.
The present embodiment comprises following step successively:
imedium-frequency induction furnace fusing nickel-base alloy becomes pre-solution
The capacity of medium-frequency induction furnace is 35t, and the nickel-base alloy added is the 30t chromium nickel pig iron, and the mass percent of Ni and the P in composition is:
Ni=12.0%，P=0.021%；
Intermediate frequency furnace induction tapping temperature is 1628 DEG C, and going out iron is 30t;
iIhot metal pretreatment provides dephosphorization molten iron
The mass percent of C and the P in dephosphorization hot metal composition is:
C=3.2%，P=0.007%；
Processing molten iron temperature is 1320 DEG C, and going out iron is 38t;
iIIdephosphorization molten iron and pre-solution are blended into KOBMS and blow
Be blended into KOBMS after the pre-solution that medium-frequency induction furnace melts mixes with dephosphorization molten iron, the capacity of KOBMS is 90 tons, in KOBMS, carry out oxygen decarburization melting, carries out alloying adjustment according to steel grades.
The mass percent that KOBMS goes out composition of steel is:
C0.28%；Si0.12%；Mn1.33%；P0.019%；S0.025%；
Cr18.13%；Ni8.17%；
All the other are Fe and inevitable impurity; Tapping temperature is 1660 DEG C.
iVvOD blowing, adjusting component
VOD goes out composition of steel according to KOBMS and blows, and carries out alloying adjustment according to steel grades, and the mass percent that VOD processes composition is:
C0.041%；Si0.42%；Mn1.33%；P0.019%；
S0.002%；Cr18.20%；Ni8.11%；
All the other are Fe and inevitable impurity.
vlF refining
LF feeding temperature-raising process to 1539 DEG C starts weak stirring, and weak churning time 12min, out-station temperature is 1531 DEG C.The mass percent of departures molten steel is:
C0.042%；Si0.41%；Mn1.34%；P0.019%；
S0.001%；Cr18.18%；Ni8.07%。
embodiment two
The steel grade that the present embodiment is smelted is 316L.
The present embodiment comprises following step successively:
I medium-frequency induction furnace fusing nickel-base alloy becomes pre-solution
The capacity of intermediate frequency furnace is 35t, and the nickel-base alloy used is ferronickel, and the mass percent of its composition is:
Ni=40%，P=0.019%；
All the other are inevitable impurity;
Intermediate frequency furnace tapping temperature is 1637 DEG C, and going out iron is 30t;
II hot metal pretreatment provides dephosphorization molten iron
The mass percent of C and the P in dephosphorization hot metal composition is:
C=3.22%，P=0.005%；
Processing molten iron temperature is 1332 DEG C, and going out iron is 31t;
III dephosphorization molten iron and pre-solution are blended into KOBMS and blow
Be blended into KOBMS after the pre-solution that medium-frequency induction furnace melts mixes with dephosphorization molten iron, the capacity of KOBMS is 90 tons, in KOBMS, carry out oxygen decarburization melting, carries out alloying adjustment according to steel grades.
The mass percent that KOBMS goes out composition of steel is:
C0.32%；Si0.12%；Mn1.80%；P0.015%；
S0.021%；Cr16.20%；Ni13.90%；Mo2.05%；
All the other are Fe and inevitable impurity; Tapping temperature is 1657 DEG C.
iVvOD blowing, adjusting component
VOD goes out composition of steel according to KOBMS and blows, and carries out alloying adjustment according to steel grades, and the mass percent that VOD processes composition is:
C0.011%；Si0.45%；Mn1.81%；P0.015%；
S0.001%；Cr16.23%；Ni13.83%；Mo2.03%；
All the other are Fe and inevitable impurity.
vlF refining
LF feeds silicon-calcium wire 330m, and feeding temperature-raising process to 1536 DEG C starts weak stirring, and weak churning time 17min, out-station temperature is 1528 DEG C.The mass percent of departures molten steel is:
C0.012%；Si0.49%；Mn1.80%；P0.015%；
S0.001%；Cr16.19%；Ni13.80%；Mo2.03%；
All the other are Fe and inevitable impurity.
Explanation of nouns: VOD-vacuum-oxygen decarbonizing stove
KOBMS, the top and bottom combined blown converter developed by German Kombiniert, " S " is the stainless meaning, so KOBMS is called stainless steel top bottom blown converter.
LF ladle refining furnace.
Claims (2)
1., by a method for dephosphorization molten iron smelting austenitic stainless steel, it comprises following step successively:
imedium-frequency induction furnace fusing nickel-base alloy becomes pre-liquation
The mass percent of Ni, P of nickel-base alloy is:
Ni=4～99.5，P≤0.045；
All the other are inevitable impurity;
Intermediate frequency furnace tapping temperature is 1550 ~ 1680 DEG C;
iIhot metal pretreatment provides dephosphorization molten iron
The mass percent of C, P of dephosphorization molten iron requires:
C=2.5～4.0，P≤0.01；
Processing molten iron temperature is 1250 ~ 1380 DEG C;
iIIdephosphorization molten iron and pre-solution are blended into KOBMS and blow
Be blended into KOBMS after the nickel-base alloy that medium-frequency induction furnace melts mixes with dephosphorization molten iron, in KOBMS, carry out oxygen decarburization melting, carry out alloying adjustment according to steel grades;
iVvOD blowing, adjusting component
VOD goes out composition of steel according to KOBMS and blows, and carries out alloying adjustment according to steel grades;
vlF refining
LF adjusting component, adjustment temperature are to target outbound temperature.
2. use the method for dephosphorization molten iron smelting austenitic stainless steel according to claim 1, its steps characteristic is: step
iin Ni-based Ni content be content needs according to smelting Ni in steel grade finished product; Matching principle is after the pre-solution of intermediate frequency furnace fusing is blended into KOBMS, and KOBMS only needs the adjustment variable quantity of trace adjustment Ni, Ni to be 1% ~ 4%.
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| CN104561733B (en) * | 2015-01-06 | 2017-01-11 | 山西太钢不锈钢股份有限公司 | Smelting method of high alloy stainless steel |
| CN109554515B (en) * | 2017-09-27 | 2020-09-01 | 鞍钢股份有限公司 | Method for smelting stainless steel by top-blown converter |
| CN110923551B (en) * | 2019-11-13 | 2021-06-08 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Production method of austenitic stainless steel for controlling cobalt content nucleus |
| CN110894565B (en) * | 2019-12-04 | 2021-07-16 | 山西太钢不锈钢股份有限公司 | Method for smelting stainless steel by using ultrahigh silicon, carbon and chromium solution |
| CN115287405A (en) * | 2022-07-20 | 2022-11-04 | 山西太钢不锈钢股份有限公司 | Production method for deferrization and nickel increase of iron-nickel alloy |
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| CN102691001A (en) * | 2011-03-22 | 2012-09-26 | 宝山钢铁股份有限公司 | Method for manufacturing austenitic stainless steel with excellent surface polishing processing performance |
| CN102766799A (en) * | 2012-08-01 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Method for smelting stainless steel with high chrome melts and dephosphorized melted iron |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102691001A (en) * | 2011-03-22 | 2012-09-26 | 宝山钢铁股份有限公司 | Method for manufacturing austenitic stainless steel with excellent surface polishing processing performance |
| CN102766799A (en) * | 2012-08-01 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Method for smelting stainless steel with high chrome melts and dephosphorized melted iron |
Non-Patent Citations (1)
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| SUS304奥氏体不锈钢的摩擦变形层研究;李晓春等;《摩擦学学报》;20070731;第27卷(第4期);第341-345页 * |
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