CN103352168A - Low-carbon and high-chromium steel and converter smelting technology thereof - Google Patents
Low-carbon and high-chromium steel and converter smelting technology thereof Download PDFInfo
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- CN103352168A CN103352168A CN2013102787110A CN201310278711A CN103352168A CN 103352168 A CN103352168 A CN 103352168A CN 2013102787110 A CN2013102787110 A CN 2013102787110A CN 201310278711 A CN201310278711 A CN 201310278711A CN 103352168 A CN103352168 A CN 103352168A
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Abstract
The invention discloses low-carbon and high-chromium steel and a converter smelting technology thereof and belongs to the technical field of metal smelting. The low-carbon and high-chromium steel comprises the components in percentage by weight as follows: 4.5-5.5 percent of Cr, no more than 0.06 percent of C, no more than 1.0 percent of Mn, no more than 0.50 percent of Si, no more than 0.010 percent of S, no more than 0.015 percent of P, no more than 0.0080 percent of N, and the balance of Fe and unavoidable impurities. The converter smelting technology of the low-carbon and high-chromium steel comprises a converter process, an RH decarbonization process, an LF (Ladle Furnace) smelting process and an RH degasification process, adopts common molten iron and smelting equipment, reasonably utilizes the procedure capacity of the equipment so as to successfully obtain the low-carbon and high-chromium steel via smelting, the content of chromium is controlled within the range of 4.5-5.5%., and the content of C is less than or equal to 0.06 percent, so that the requirement of anti-corrosion steel on components is required.
Description
Technical field
The present invention relates to a kind of low-carbon (LC) high chromium steel and converter smelting process thereof, belong to the Metal smelting technical field.
Background technology
At present, in order to satisfy the demand of different corrosive environments, progressively developed chromium content at 3% ~ 9% corrosion-resisting steel.When smelting above-mentioned steel, because the existence of chromium greatly reduces the activity of carbon and oxygen element in the molten steel, in order to reach the purpose of decarburization and cr yield, mainly be to adopt electric furnace single stage method or electric furnace+VOD two-step approach to smelt at present, above smelting technology needs carry out dephosphorizing pretreatment or adopt the high-quality steel scrap molten iron, and smelting cost is high or require the configuration specific installation.
Because the Cr content in the converter smelting steel need to need to add high carbon ferro-chrome more than or equal to the ultra low-carbon steel of 5 wt% in converter, for guaranteeing the recovery rate of chromium, tapping carbon requires more than 0.2%.Because carbon content is higher in the steel, therefore be not adopt the RH stove to process mostly, but by vacuum degassing furnace (VOD stove) process for producing Ultra-low carbon high chromium steel, so domestic Special Steel Works all is to adopt the VOD stove to produce the low-carbon (LC) high chromium steel.Because stainless steel contains a large amount of alloys, chromium content is 11% ~ 30%, and cost is higher, has limited being widely used of its.
Summary of the invention
Technical problem to be solved by this invention is, need not increase newly in the Special Steel Works equipment situation in common steel mill, utilize existing RH equipment reasonable twice, realized that general steel mill smelts special steel, proposed a kind of low-carbon (LC) high chromium steel and converter smelting process thereof, by the appropriate design to technique and composition, made its chromium content can control 4.5% ~ 5.5%, C≤0.06% has satisfied the composition requirement of corrosion-resisting steel.
The technical scheme that the present invention solves above technical problem is: a kind of low-carbon (LC) high chromium steel is provided, be by weight percentage, Cr:4.5%～5.5%, C :≤0.06%, Mn :≤1.0%, Si :≤0.50%, S :≤0.010%, P :≤0.015%, N :≤0.0080%, all the other are Fe and inevitable impurity.
Chemical composition is one of key factor that affects continuously cast bloom internal soundness and High Strength Steel Plate performance, and the present invention is in order to make described steel obtain excellent over-all properties, and the chemical composition of described steel is limited, and reason is:
C: carbon is the one of the chief elements that affects the high-strength steel mechanical property, improves the intensity of steel by the gap solid solution, and during too high levels, toughness and weldability be variation, and carbon content control of the present invention is at C :≤0.06%.
Si: silicon is the necessary deoxidant element of steel-making, has certain solution strengthening effect; Silicone content is too high, is unfavorable for plate surface quality and low-temperature flexibility, and silicone content of the present invention is controlled at Si :≤0.50%.
Mn: the effect that manganese has thinning microstructure, improves intensity and low-temperature flexibility, and also with low cost.During the manganese too high levels, easily cause continuous casting slab segregation.Manganese content of the present invention is controlled at Mn :≤1.0%.
Impurity element such as S, P etc. in the steel, can grievous injury the low-temperature flexibility of described steel and the nearly weld metal zone of welding, increase the continuous casting slab segregation degree, so sulphur, phosphorus content should be controlled at S≤0.0010% and P≤below 0.015%.
The technical scheme that the present invention further limits is: aforesaid low-carbon (LC) high chromium steel comprises following composition: Cr:4.7%, C:0.04%, Mn :≤1.0% by weight percentage, Si :≤0.50%, S:0.005%, P:0.008%, N:0.0061%,, all the other are Fe and inevitable impurity.
Aforesaid low-carbon (LC) high chromium steel comprises following composition: Cr:5.3% by weight percentage, C:0.03%, and Mn :≤1.0%, Si :≤0.50%, S:0.008%, P:0.011%, N:0.0052%,, all the other are Fe and inevitable impurity.
Aforesaid low-carbon (LC) high chromium steel converter smelting process, comprise converter process, RH decarbonization process, LF stove smelting technology and RH degasification technique, converter process adopts conventional molten iron blowing, phosphorus content is controlled at P:0.090 ~ 0.140% by weight percentage in the molten iron, bessemerize the control of endpoint molten steel component: C≤0.06%, S≤0.015%, P≤0.013%, O≤1500ppm; Converter tapping adopts weak deoxidation, and Oxygen Content in Liquid Steel is 150 ~ 400ppm;
The operation terminal point C of RH decarbonization process≤0.02%;
LF stove smelting technology carries out chromium alloying and desulfurization operations, adds 1/5 extra low carbon ferrochromium before LF begins to process; After processing 30 minutes, add 2/5 extra low carbon ferrochromium; After processing 60 minutes, add 1/5 extra low carbon ferrochromium; After processing 80 minutes, add 1/5 extra low carbon ferrochromium, final alloy dimension water component: Cr:4.5% ~ 5.5%, S≤0.010%;
Vacuum tightness≤the 500Pa of RH degasification technique, vacuum hold-time 〉=15min, endpoint molten steel nitrogen≤0.0080%.
Aforementioned low-carbon (LC) high chromium steel converter smelting process,
Converter process adopts conventional molten iron blowing, and phosphorus content is controlled at P:0.092% by weight percentage in the molten iron, bessemerizes endpoint molten steel component control C:0.04%, S:0.013%, P:0.008%, O:800ppm; Converter tapping adopts weak deoxidation, and Oxygen Content in Liquid Steel is 200ppm;
The operation terminal point C:0.015% of RH decarbonization process;
LF stove smelting technology carries out chromium alloying and desulfurization operations, molten steel component Cr:4.7%, S:0.005%;
The vacuum tightness 350Pa of RH degasification technique, vacuum hold-time 16min, endpoint molten steel nitrogen 0.0061%.
Aforementioned low-carbon (LC) high chromium steel converter smelting process,
Converter process adopts conventional molten iron blowing, and phosphorus content is controlled at P:0.135% by weight percentage in the molten iron, bessemerizes endpoint molten steel component control C:0.03%, S:0.010%, P:0.011%, O:1400ppm; Converter tapping adopts weak deoxidation, and Oxygen Content in Liquid Steel is 350ppm;
The operation terminal point C:0.010% of RH decarbonization process;
LF stove smelting technology carries out chromium alloying and desulfurization operations, molten steel component Cr:5.3%, S:0.008%;
The vacuum tightness 310Pa of RH degasification technique, vacuum hold-time 19min, endpoint molten steel nitrogen 0.0052%.
The invention has the beneficial effects as follows: technique of the present invention is by adopting conventional molten iron and smelting equipment, rationally utilize the process capability of each equipment, successfully smelted the low-carbon (LC) high chromium steel, its chromium content can control 4.5% ~ 5.5%, C≤0.06% has satisfied the composition requirement of corrosion-resisting steel.
Embodiment
Embodiment 1
Conventional molten iron blowing is adopted in converter, in the molten iron is by weight percentage, and P:0.092% bessemerizes endpoint molten steel component control C:0.04%, S:0.013%, P:0.008%, O:800ppm; Converter tapping adopts weak deoxidation, and Oxygen Content in Liquid Steel is 200ppm; RH Decarburization Operation terminal point C:0.015%; The LF stove carries out chromium alloying and desulfurization operations, adds 1/5 extra low carbon ferrochromium before LF begins to process, and when processing 35 minutes, adds 2/5 extra low carbon ferrochromium; When processing 62 minutes, add 1/5 extra low carbon ferrochromium; When processing 83 minutes, add 1/5 extra low carbon ferrochromium, final steel water component Cr:4.7%, S:0.005%; The vacuum tightness 350Pa that RH is degassed, vacuum hold-time 16min, endpoint molten steel nitrogen 0.0061%.(please replenish concrete production technique and working method thereof)
Embodiment 2
Conventional molten iron blowing is adopted in converter, in the molten iron is by weight percentage, and P:0.135% bessemerizes endpoint molten steel component control C:0.03%, S:0.010%, P:0.011%, O:1400ppm; Converter tapping adopts weak deoxidation, and Oxygen Content in Liquid Steel is 350ppm; RH Decarburization Operation terminal point C:0.010%; The LF stove carries out chromium alloying and desulfurization operations, adds 1/5 extra low carbon ferrochromium before LF begins to process, and after processing 32 minutes, adds 2/5 extra low carbon ferrochromium; After processing 61 minutes, add 1/5 extra low carbon ferrochromium; After processing 85 minutes, add 1/5 extra low carbon ferrochromium, final steel water component Cr:5.3%, S:0.008%; The vacuum tightness 310Pa that RH is degassed, vacuum hold-time 19min, endpoint molten steel nitrogen 0.0052%.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (6)
1. low-carbon (LC) high chromium steel is characterized in that: be by weight percentage, Cr:4.5%～5.5%, C :≤0.06%, Mn :≤1.0%, Si :≤0.50%, S :≤0.010%, P :≤0.015%, N :≤0.0080%, all the other are Fe and inevitable impurity.
2. low-carbon (LC) high chromium steel as claimed in claim 1 is characterized in that: comprise by weight percentage following composition: Cr:4.7%, C:0.04%, Mn :≤1.0%, Si :≤0.50%, S:0.005%, P:0.008%, N:0.0061%,, all the other are Fe and inevitable impurity.
3. low-carbon (LC) high chromium steel as claimed in claim 1 is characterized in that: comprise by weight percentage following composition: Cr:5.3%, C:0.03%, Mn :≤1.0%, Si :≤0.50%, S:0.008%, P:0.011%, N:0.0052%,, all the other are Fe and inevitable impurity.
4. such as the described low-carbon (LC) high chromium steel of arbitrary claim converter smelting process among the claim 1-3, comprise converter process, RH decarbonization process, LF stove smelting technology and RH degasification technique, it is characterized in that:
Described converter process is conventional molten iron blowing, and phosphorus content is controlled at P:0.090 ~ 0.140% by weight percentage in the molten iron, bessemerizes the control of endpoint molten steel component: C≤0.06%, S≤0.015%, P≤0.013%, O≤1500ppm; Oxygen Content in Liquid Steel is 150 ~ 400ppm during converter tapping;
The operation terminal point of described RH decarbonization process is C≤0.02%;
Described LF stove smelting technology carries out chromium alloying and desulfurization operations, adds 1/5 extra low carbon ferrochromium before LF begins to process; After processing 30 minutes, add 2/5 extra low carbon ferrochromium; After processing 60 minutes, add 1/5 extra low carbon ferrochromium; After processing 80 minutes, add 1/5 extra low carbon ferrochromium, final alloy dimension water component: Cr:4.5% ~ 5.5%, S≤0.010%;
Vacuum tightness≤500Pa in the described RH degasification technique, vacuum hold-time 〉=15min, endpoint molten steel nitrogen≤0.0080%.
5. the described low-carbon (LC) high chromium steel of claim 4 converter smelting process is characterized in that:
Conventional molten iron blowing is adopted in described converter, and phosphorus content is controlled at P:0.092% by weight percentage in the molten iron, bessemerizes endpoint molten steel component control C:0.04%, S:0.013%, P:0.008%, O:800ppm; Oxygen Content in Liquid Steel is 200ppm during converter tapping;
Described RH Decarburization Operation terminal point C:0.015%;
Described LF stove carries out chromium alloying and desulfurization operations, molten steel component Cr:4.7%, S:0.005%;
The vacuum tightness 350Pa that described RH is degassed, vacuum hold-time 16min, endpoint molten steel nitrogen 0.0061%.
6. the described low-carbon (LC) high chromium steel of claim 4 converter smelting process is characterized in that:
Conventional molten iron blowing is adopted in described converter, and phosphorus content is controlled at P:0.135% by weight percentage in the molten iron, bessemerizes endpoint molten steel component control C:0.03%, S:0.010%, P:0.011%, O:1400ppm; Oxygen Content in Liquid Steel is 350ppm during converter tapping;
Described RH Decarburization Operation terminal point C:0.010%;
Described LF stove carries out chromium alloying and desulfurization operations, molten steel component Cr:5.3%, S:0.008%;
The vacuum tightness 310Pa that described RH is degassed, vacuum hold-time 19min, endpoint molten steel nitrogen 0.0052%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103642967A (en) * | 2013-11-18 | 2014-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing high-chromium steel by converter |
| CN105908056A (en) * | 2016-06-17 | 2016-08-31 | 辽宁科技大学 | Smelting method of low-carbon low-nitrogen high-chrome steel |
| WO2019128285A1 (en) * | 2017-12-25 | 2019-07-04 | 南京钢铁股份有限公司 | Anti-carburetion method for producing low-carbon and low-sulfur steel by means of lf refining furnace |
| CN115401177A (en) * | 2022-08-02 | 2022-11-29 | 首钢京唐钢铁联合有限责任公司 | Low-carbon steel continuous casting and rolling smelting method capable of avoiding blockage of stopper rod |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103642967A (en) * | 2013-11-18 | 2014-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing high-chromium steel by converter |
| CN105908056A (en) * | 2016-06-17 | 2016-08-31 | 辽宁科技大学 | Smelting method of low-carbon low-nitrogen high-chrome steel |
| WO2019128285A1 (en) * | 2017-12-25 | 2019-07-04 | 南京钢铁股份有限公司 | Anti-carburetion method for producing low-carbon and low-sulfur steel by means of lf refining furnace |
| RU2750303C1 (en) * | 2017-12-25 | 2021-06-25 | Наньцзин Айрон Энд Стил Ко., Лтд. | Method for producing low-carbon steel with sulfur content [s] ≤ 0.0015% in bucket furnace refining unit |
| CN115401177A (en) * | 2022-08-02 | 2022-11-29 | 首钢京唐钢铁联合有限责任公司 | Low-carbon steel continuous casting and rolling smelting method capable of avoiding blockage of stopper rod |
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