CN103045948A - High-chromium steel and manufacturing method thereof - Google Patents
High-chromium steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides high-chromium steel and a manufacturing method thereof. The manufacturing method comprises the following steps: (a) performing primary melting of molten steel; (b) discharging steel from a ladle when the C content in the molten steel is 0.04%-0.10%, the P content is not more than 0.010 and the S content is not more than 0.008%; (c) during the steel discharge process, adjusting the Cr content of the molten steel to be 1.8%-2.5% and adjusting the oxygen content of the molten steel to be not more than 0.005%; (d) adjusting the oxidizability level of the ladle slag to not more than 1%; (e) refining the molten steel in a ladle refining furnace, and adjusting the Cr content to be 2.7%-3.0% and the S content to be not more than 0.003%; (f) performing calcification treatment on the molten steel; (g) performing circulated vacuum degassing treatment on the molten steel and adjusting the Cr content of the molten steel to be 2.8%-3.2%; and (h) performing calcification treatment on the molten steel, to obtain high-chromium steel. According to the invention, the manufacturing method of high-chromium steel can prevent molten steel temperature drop caused by alloying resulting from excessive amount of ferrochrome iron, and can increase the chromium yield by repeatedly feeding ferrochrome iron.
Description
Technical field
The present invention relates to a kind of high chromium steel and manufacture method thereof.
Background technology
High chromium steel has many advantages, and for example, the high chromium steel of chromium content about 3% has anti-C0
2, H
2Advantages such as the sour gas such as S and can be used as oil casing pipe steel.
Above-mentioned high chromium steel usually carries out alloying by adding ferrochrome in smelting tapping process and obtains.Because the chromium content in the high chromium steel is larger, so need to add a large amount of ferrochrome in tapping process.Yet this mode that adds a large amount of ferrochrome in tapping process can make the temperature of molten steel sharply reduce and be unfavorable for the subsequent disposal of molten steel.In addition, in order to reduce a large amount of adding ferrochrome to the impact of liquid steel temperature, usually in tapping process, add expensive low carbon ferrochromium, cause the production cost of high chromium steel to increase, and the adding low carbon ferrochromium is limited to preventing the rapid contribution that descends of liquid steel temperature in tapping process.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art and a kind of high chromium steel and manufacture method thereof are provided.
According to an aspect of the present invention, provide a kind of manufacture method of high chromium steel, this manufacture method may further comprise the steps: (a) first steel-making water; (b) be 0.04%～0.10% at the C of molten steel content, P content is not more than 0.010%, when S content is not more than 0.008%, taps to ladle; (c) in tapping process, the Cr content of adjusting molten steel be 1.8%～2.5% and the oxygen level of adjusting molten steel for being not more than 0.0005%; (d) oxidisability of ladle slag is adjusted into is not more than 1%; (e) refined molten steel in ladle refining furnace is adjusted Cr content and is 2.7%～3.0%, S content is for being not more than 0.003%; (f) molten steel is carried out calcification processing; (g) molten steel is carried out the degassed processing of circulating vacuum, and the Cr content of adjustment molten steel is 2.8%～3.2%; (h) molten steel is carried out calcification processing, thereby obtain high chromium steel, described high chromium steel comprises 0.15%～0.20% C, 0.15%～0.30% Si, 0.45%～0.60% Mn, 2.8%～3.2% Cr, 0.40%～0.50% Mo, 0.01%～0.04% Al, 0.01%～0.03% Ti, be not more than 0.015% P, be not more than 0.008% S, the iron of surplus and inevitable impurity, the content of each element is weight percent content in the high chromium steel.
According to exemplary embodiment of the present invention, in step (a), can adopt converter just to make steel water.
According to exemplary embodiment of the present invention, in step (c), can adopt ferrochrome to adjust the Cr content of molten steel.
According to exemplary embodiment of the present invention, in step (c), can adopt high carbon ferro-chrome to adjust the Cr content of molten steel.
According to exemplary embodiment of the present invention, in step (c), can adjust Si content in the molten steel and be 0.15%～0.25%, Mn content is 0.40%～0.50%, Mo content is 0.40%～0.50%.
According to exemplary embodiment of the present invention, in step (c), can adjust Si content, Mn content and Mo content by alloying material being added molten steel, alloying material can comprise for aluminium ferromanganese, manganese metal and the ferromanganese of adjusting Mn content at least a, be used for adjusting the ferrosilicon of Si content and the molybdenum-iron that is used for adjusting Mo content.
According to exemplary embodiment of the present invention, in step (c), can adopt ferro-aluminum to adjust the oxygen level of molten steel for being not more than 0.0005%.
According to exemplary embodiment of the present invention, in step (d), can add the high alumina slag supplying agent in the ladle slag and the oxidisability of ladle slag is adjusted into is not more than 1%.
According to exemplary embodiment of the present invention, can adjust Cr content to adding low carbon ferrochromium in the molten steel in step (e) is 2.7%～3.0%.
According to exemplary embodiment of the present invention, the silicon-calcium wire that can add 0.33kg/ ton molten steel～0.55kg/ ton molten steel in step (f) in the molten steel after the ladle refining furnace refining carries out calcification processing.
According to exemplary embodiment of the present invention, in step (g), can be 2.8%～3.2% to the Cr content of adding low carbon ferrochromium adjustment molten steel in the molten steel.
According to exemplary embodiment of the present invention, in step (g), can be 0.01%～0.03% to the Ti content of adding ferrotianium adjustment molten steel in the molten steel.
According to exemplary embodiment of the present invention, the silicon-calcium wire that can add to circulating vacuum 0.22kg/ ton molten steel～0.44kg/ ton molten steel in step (h) in the molten steel after the degassed processing carries out calcification processing.
According to exemplary embodiment of the present invention, the manufacture method of high chromium steel can also be included in step (h) pours into a mould to make steel billet afterwards to molten steel step.
According to a further aspect in the invention, a kind of high chromium steel is provided, this high chromium steel comprises 0.15%～0.20% C, 0.15%～0.30% Si, 0.45%～0.60% Mn, 2.8%～3.2% Cr, 0.40%～0.50% Mo, 0.01%～0.04% Al, 0.01%～0.03% Ti by weight, be not more than 0.015% P, be not more than 0.008% S, the iron of surplus and inevitable impurity.
Manufacture method according to high chromium steel of the present invention, respectively in refined molten steel in ladle tapping, ladle refining furnace and molten steel is carried out in the process of the degassed processing of circulating vacuum the chromium content in the molten steel is adjusted, prevented from once adding in a large number ferrochrome and carried out the liquid steel temperature that alloying causes and reduce.In addition, can improve the recovery rate of chromium by repeatedly adding ferrochrome.
Embodiment
Comprise by weight percentage 0.15%～0.20% C, 0.15%～0.30% Si, 0.45%～0.60% Mn, 2.8%～3.2% Cr, 0.40%～0.50% Mo, 0.01%～0.04% Al (full aluminium), 0.01%～0.03% Ti, be not more than 0.015% P, be not more than 0.008% S according to high chromium steel of the present invention, and the iron of surplus and inevitable impurity.The content of all components that relates in this manual, is weight percent content.
The below describes the manufacture method of the high chromium steel with said components in detail with reference to exemplary embodiment.
The manufacture method of high chromium steel comprises just steel-making water, LF stove refined molten steel and molten steel is carried out the degassed processing of circulating vacuum (that is, the degassed processing of RH circulating vacuum) according to an exemplary embodiment of the present invention.
At first, can in converter, add molten iron, utilize the function of Converter Oxigen Blowing decarburization, molten iron just is smelt molten steel.According to an exemplary embodiment of the present invention molten iron just is smelt molten steel and is not subjected to concrete restriction.For example, according to exemplary embodiment of the present invention, low-sulfur can be contained vanadium-titanium-iron-water and blow in the blowing vanadium extracting converter and obtain half steel, then the half steel that makes being blown in top and bottom combined blown converter obtains molten steel.When just refining of molten steel to the C content of molten steel be 0.04%～0.10%, P content is not more than 0.010%, when S content is not more than 0.008%, taps to ladle.
In tapping process, can add in the ladle alloy, reductor and refining slag adjust the Cr content of molten steel be 1.8%～2.5% and the oxygen level of adjusting molten steel for being not more than 0.0005%.According to exemplary embodiment of the present invention, can in tapping process, in ladle, add the Cr content that ferrochrome is adjusted molten steel, preferably, can in ladle, add the Cr content that high carbon ferro-chrome is adjusted molten steel, this is can be to molten steel recarburization because the Cr content that adopts high carbon ferro-chrome to adjust molten steel has not only reduced manufacturing cost, makes the carbon content of the molten steel that final smelting obtains reach requirement.Yet, the invention is not restricted to this, can adopt low carbon ferrochromium or medium carbon ferrochrome to adjust the Cr content of molten steel here, and can adopt the mode that adds separately carburelant to come molten steel is carried out carburetting.Here, for example, high carbon ferro-chrome can be that the trade mark is FeCr
67C
6.0, FeCr
55C
6.0, FeCr
67C
9.5And FeCr
55C
10.0Ferrochrome, medium carbon ferrochrome can be that the trade mark is FeCr
69C
1.0, FeCr
69C
2.0And FeCr
69C
4.0Ferrochrome, low carbon ferrochromium can be that the trade mark is FeCr
69C
0.25And FeCr
69C
0.50Ferrochrome, yet, those skilled in the art will recognize that, high carbon ferro-chrome of the present invention, medium carbon ferrochrome and low carbon ferrochromium are not limited to this.According to exemplary embodiment of the present invention, can be in tapping process add in the ladle and adjust the oxygen level of molten steel for being not more than 0.0005% such as the reductor of ferro-aluminum.
In addition, according to exemplary embodiment of the present invention, in converter tapping process, can follow ferrochrome to add together the alloy of adjusting Mn, Si and Mo content in the ladle, take adjust Si content in the molten steel as 0.15%～0.25%, Mn content as 0.40%～0.50%, Mo content is as 0.40%～0.50%.According to exemplary embodiment of the present invention, the alloy that is used for adjustment Si content can be ferrosilicon (FeSi), the alloy that is used for adjustment Mn content can be at least a of aluminium ferromanganese, manganese metal and ferromanganese (for example low carbon ferromanganese), and the alloy that is used for adjustment Mo content can be molybdenum-iron (FeMo).Here, the Si in the alloying material, Mn, Al also have the effect of deoxidation, can play the effect of reductor.
Next, after converter tapping is finished, the oxidisability (FeO+MnO) of ladle slag is adjusted into is not more than 1%, to reduce the oxygen level in the molten steel.According to exemplary embodiment of the present invention, can adopt the high alumina slag supplying agent to adjust the oxidisability of ladle slag.
Next, refined molten steel in the LF stove, take adjust Cr content as 2.7%～3.0%, S content is for being not more than 0.003%.According to exemplary embodiment of the present invention, can adding low carbon ferrochromium in the ladle, to adjust the Cr content of molten steel be 2.7%～3.0%.In addition, according to exemplary embodiment of the present invention, can add refining slag, reductor (for example, ferro-aluminum reductor) in the ladle and control the compositions such as S, P in the molten steel, Al.According to exemplary embodiment of the present invention, the temperature of the molten steel after the refining of LF stove can be 1625 ℃～1645 ℃.
Next, after refined molten steel is finished in the LF stove, molten steel is carried out calcification processing, with to the Al in the molten steel
2O
3Thereby carry out denaturing treatment and improve steel quality.According to exemplary embodiment of the present invention, the silicon-calcium wire that can add 0.33kg/ ton molten steel～0.55kg/ ton molten steel in the molten steel after the ladle refining furnace refining carries out calcification processing.
Next, molten steel is carried out the degassed processing of RH circulating vacuum, and the Cr content of adjustment molten steel is 2.8%～3.2%.According to exemplary embodiment of the present invention, can adding low carbon ferrochromium in the ladle, to adjust the Cr content of molten steel be 2.8%～3.2%.In addition, in the degassed treating processes of RH circulating vacuum, can finely tune the amount of other alloying constituents so that the amount of the alloy compositions in the molten steel meets the molten steel component of expection.According to exemplary embodiment of the present invention, in the degassed treating processes of RH circulating vacuum, can be 0.01%～0.03% to the adding 0.7kg/ ton Ti content that molten steel～40 ferrotianiums of 0.9kg/ ton molten steel are adjusted in the molten steel in the molten steel, the titanium content of molten steel is adjusted in this scope the crystal grain of the high chromium steel that can refinement obtains, thereby improves the intensity of high chromium steel.According to exemplary embodiment of the present invention, can be 1575 ℃～1595 ℃ through the temperature of the molten steel of the degassed processing of RH circulating vacuum.
At last, molten steel is carried out calcification processing, thereby obtain high chromium steel.According to exemplary embodiment of the present invention, the silicon-calcium wire that can add 0.22kg/ ton molten steel～0.44kg/ ton molten steel in the molten steel after the degassed processing of RH circulating vacuum carries out calcification processing.
The description of as above manufacture method of high chromium steel according to an exemplary embodiment of the present invention being carried out can be found out, by respectively in refined molten steel in ladle tapping, ladle refining furnace and molten steel is carried out in the process of the degassed processing of circulating vacuum the chromium content in the molten steel is adjusted, can prevent from once adding in a large number ferrochrome and carry out the liquid steel temperature reduction that alloying causes, and can improve the recovery rate of chromium by repeatedly adding ferrochrome.In addition, the manufacture method of high chromium steel is being carried out calcification processing and to Al after the refining of LF stove and after the degassed processing of RH circulating vacuum respectively according to an exemplary embodiment of the present invention
2O
3Be mingled with and carry out modification, therefore, can improve steel quality.
In addition, after the manufacturing of finishing above-mentioned high chromium steel molten steel, can also pour into a mould to make steel billet to the high chromium steel molten steel that obtains.For example, adopt continuous casting protection pouring, M-EMS technique can obtain the high chromium steel base that section is Φ 200mm to the molten steel in the ladle.
Further specify the manufacture method of high chromium steel of the present invention below in conjunction with example.
Example 1
The half steel that contains after the vanadium-titanium-iron-water vanadium extraction take low-sulfur carries out just steel-making water as raw material, wherein, half steel comprises 3.70% C, 0.05% Mn, 0.068% P, 0.0045% S, 0.033% V and Cr, Si and the Ti of tracer level by weight percentage, and surplus is iron and inevitable impurity.
140 tons of above-mentioned half steels are added in the top and bottom combined blown converter of 120 tons (nominal capacities), utilize the function of top and bottom combined blown converter oxygen decarburization that above-mentioned half steel just is smelt molten steel.When just refining of molten steel to C content be 0.040%, Mn content is 0.033%, P content is 0.0030%, S content is 0.0052%, when temperature is 1688 ℃, begins pushing off the slag and tap in ladle.
In tapping process, in ladle, add the high alkalinity refining slag of 4.5kg/ ton molten steel and the ferro-aluminum reductor of 2.3kg/ ton molten steel, and add alloy material in the ladle and carry out the molten steel alloying, wherein, the high alkalinity refining slag that uses in this example comprises by weight percentage and is not less than 70% CaO, is not more than 5% Al
2O
3, be not more than 5% SiO
2And 8%～14% CaF
2Specifically, in tapping process, add the high carbon ferro-chrome of 35kg/ ton molten steel, the ferrosilicon of 2.7kg/ ton molten steel, the manganese metal of 4.5kg/ ton molten steel, the molybdenum-iron of 7.5kg/ ton molten steel.After adding, recording molten steel actual oxygen content with apparatus for determination of oxygen is 0.0003%, and Cr content is 2.03% in the molten steel, Si content is 0.22%, Mn content is 0.45%, Mo content is 0.42%, P content is 0.004%, S content is 0.006%.
After the molten steel tapping is finished in the converter, on the ladle top of the slag, add high alumina slag supplying agent 200kg, carried out the soft blow argon gas 5 minutes, thereby the oxidisability of ladle slag is adjusted into 0.8%, wherein, the high alumina slag supplying agent comprises by weight percentage and is not less than 30% metallic aluminium, 5%～15% Al
2O
3, 6%～12% CaF
2With the CaO that is not less than 25%.
In the LF stove, above-mentioned molten steel is carried out refining.In the LF stove in the refined molten steel process, add ferro-aluminum reductor and the heating of high alkalinity refining slag and the 0.15kg/ ton molten steel of 1.15kg/ ton molten steel in the ladle.After the high alkalinity refining slag melting that adds, in ladle, add the high alkalinity refining slag of 1.05kg/ ton molten steel and the ferro-aluminum reductor of 0.15kg/ ton molten steel again.After the refining slag melting that again adds, add the low carbon ferrochromium of 15kg/ ton molten steel in the ladle.Refined molten steel is after 42 minutes in the LF stove, and Cr content is 2.88% in the molten steel after the refining, Si content is 0.23%, Mn content is 0.47%, Mo content is 0.46%, Als (full aluminium) content is 0.03%, P content is 0.005%, S content is 0.003%.
In the LF stove after the refined molten steel, add the silicon-calcium wire of 0.55kg/ ton molten steel in the molten steel and carry out soft blow argon gas 8 minutes to carry out calcification processing.
Molten steel after the calcification processing is carried out the degassed processing of RH circulating vacuum, and wherein, the lift gas flow is 1400NL/ minute, and vacuum tightness is less than 3mbar, and the treatment time is 12 minutes.Process after 12 minutes, keep vacuum tightness, the low carbon ferrochromium, the Al ball of 0.3kg/ ton molten steel and 40 ferrotianiums of 0.9kg/ ton molten steel that add 1kg/ ton molten steel in the molten steel carry out alloying.After the alloying, recycling processing 5 minutes is so that molten steel composition is even.
After the degassed processing of RH circulating vacuum, add the silicon-calcium wire of 0.22kg/ ton molten steel in the molten steel and carry out soft blow argon gas 5 minutes to carry out calcification processing.By analysis, molten steel after calcification processing comprises 0.16% C, 0.29% Si, 0.53% Mn, 2.93% Cr, 0.46% Mo, 0.02% Al, 0.027% Ti, 0.007% P, 0.003% S, surplus is iron and inevitable impurity, and the chromium recovery rate of adding is 96%.
At last, adopting continuous casting protection pouring, M-EMS technique to obtain section to the molten steel in the ladle is the high chromium strand of Φ 200mm.
Example 2
The half steel that contains after the vanadium-titanium-iron-water vanadium extraction take low-sulfur carries out just steel-making water as raw material, wherein, half steel comprises 3.66% C, 0.045% Mn, 0.077% P, 0.0033% S, 0.031% V and Cr, Si and the Ti of tracer level by weight percentage, and surplus is iron and inevitable impurity.
140 tons of above-mentioned half steels are added in the top and bottom combined blown converter of 120 tons (nominal capacities), utilize the function of top and bottom combined blown converter oxygen decarburization that above-mentioned half steel just is smelt molten steel.When just refining of molten steel to C content be 0.043%, Mn content is 0.032%, P content is 0.0035%, S content is 0.0037%, when temperature is 1677 ℃, begins pushing off the slag and tap in ladle.
In tapping process, in ladle, add the high alkalinity refining slag of 4.5kg/ ton molten steel and the ferro-aluminum reductor of 2.5kg/ ton molten steel, and add alloy material in the ladle and carry out the molten steel alloying, wherein, the high alkalinity refining slag that uses in this example comprises by weight percentage and is not less than 70% CaO, is not more than 5% Al
2O
3, be not more than 5% SiO
2And 8%～14% CaF
2Specifically, in tapping process, add the high carbon ferro-chrome of 36kg/ ton molten steel, the ferrosilicon of 2.6kg/ ton molten steel, the manganese metal of 4.5kg/ ton molten steel, the molybdenum-iron of 5.6kg/ ton molten steel.After adding, recording molten steel actual oxygen content with apparatus for determination of oxygen is 0.0004%, and Cr content is 2.05% in the molten steel, Si content is 0.19%, Mn content is 0.41%, Mo content is 0.42%, P content is 0.0044%, S content is 0.0042%.
After the molten steel tapping is finished in the converter, on the ladle top of the slag, add high alumina slag supplying agent 200kg, carried out the soft blow argon gas 5 minutes, thereby the oxidisability of ladle slag is adjusted into 0.9%, wherein, the high alumina slag supplying agent comprises by weight percentage and is not less than 30% metallic aluminium, 5%～15% Al
2O
3, 6%～12% CaF
2With the CaO that is not less than 25%.
In the LF stove, above-mentioned molten steel is carried out refining.In the LF stove in the refined molten steel process, add ferro-aluminum reductor and the heating of high alkalinity refining slag and the 0.15kg/ ton molten steel of 1.15kg/ ton molten steel in the ladle.After the refining slag melting that adds, in ladle, add the refining slag of 1.15kg/ ton molten steel and the ferro-aluminum reductor of 0.15kg/ ton molten steel again.After the refining slag melting that again adds, add the low carbon ferrochromium of 15kg/ ton molten steel in the ladle.Refined molten steel is after 42 minutes in the LF stove, and Cr content is 2.87% in the molten steel after the refining, Si content is 0.23%, Mn content is 0.50%, Mo content is 0.44%, Als content is 0.015%, P content is 0.0055%, S content is 0.0025%.
In the LF stove after the refined molten steel, add the silicon-calcium wire of 0.33kg/ ton molten steel in the molten steel and carry out soft blow argon gas 8 minutes to carry out calcification processing.
Molten steel after the calcification processing is carried out the degassed processing of RH circulating vacuum, and wherein, the lift gas flow is 1400NL/ minute, and vacuum tightness is less than 3mbar, and the treatment time is 12 minutes.Process after 12 minutes, keep vacuum tightness, the low carbon ferrochromium, the Al ball of 0.5kg/ ton molten steel and 40 ferrotianiums of 0.8kg/ ton molten steel that add 0.8kg/ ton molten steel in the molten steel carry out alloying.After the alloying, recycling processing 5 minutes is so that molten steel composition is even.
After the degassed processing of RH circulating vacuum, add 0.44kg/ ton molten steel silicon-calcium wire in the molten steel and carry out soft blow argon gas 5 minutes to carry out calcification processing.By analysis, molten steel after calcification processing comprises 0.17% C, 0.24% Si, 0.54% Mn, 2.94% Cr, 0.41% Mo, 0.04% Al, 0.015% Ti, 0.007% P, 0.004% S, surplus is iron and inevitable impurity, and the chromium recovery rate of adding is 98%.
At last, adopting continuous casting protection pouring, M-EMS technique to obtain section to the molten steel in the ladle is the high chromium strand of Φ 200mm.
Example 3
The half steel that contains after the vanadium-titanium-iron-water vanadium extraction take low-sulfur carries out just steel-making water as raw material, wherein, half steel comprises 3.65% C, 0.04% Mn, 0.072% P, 0.0042% S, 0.031% V and Cr, Si and the Ti of tracer level by weight percentage, and surplus is iron and inevitable impurity.
140 tons of above-mentioned half steels are added in the top and bottom combined blown converter of 120 tons (nominal capacities), utilize the function of top and bottom combined blown converter oxygen decarburization that above-mentioned half steel just is smelt molten steel.When just refining of molten steel to C content be 0.045%, Mn content is 0.031%, P content is 0.005%, S content is 0.0035%, when temperature is 1688 ℃, begins pushing off the slag and tap in ladle.
In tapping process, in ladle, add the high alkalinity refining slag of 4.5kg/ ton molten steel and the ferro-aluminum reductor of 2.4kg/ ton molten steel, and add alloy material in the ladle and carry out the molten steel alloying, wherein, the high alkalinity refining slag that uses in this example comprises by weight percentage and is not less than 70% CaO, is not more than 5% Al
2O
3, be not more than 5% SiO
2And 8%～14% CaF
2Specifically, in tapping process, add the high carbon ferro-chrome of 35kg/ ton molten steel, the ferrosilicon of 2.8kg/ ton molten steel, the manganese metal of 3.8kg/ ton molten steel, the molybdenum-iron of 6.9kg/ ton molten steel.After adding, recording molten steel actual oxygen content with apparatus for determination of oxygen is 0.0003%, and Cr content is 2.10% in the molten steel, Si content is 0.24%, Mn content is 0.43%, Mo content is 0.435%, P content is 0.006%, S content is 0.0045%.
After the molten steel tapping is finished in the converter, on the ladle top of the slag, add high alumina slag supplying agent 200kg, carried out the soft blow argon gas 5 minutes, thereby the oxidisability of ladle slag is adjusted into 0.8%, wherein, the high alumina slag supplying agent comprises by weight percentage and is not less than 30% metallic aluminium, 5%～15% Al
2O
3, 6%～12% CaF
2With the CaO that is not less than 25%.
In the LF stove, above-mentioned molten steel is carried out refining.In the LF stove in the refined molten steel process, add ferro-aluminum reductor and the heating of high alkalinity refining slag and the 0.15kg/ ton molten steel of 1.15kg/ ton molten steel in the ladle.After the refining slag melting that adds, in ladle, add the refining slag of 1.05kg/ ton molten steel and the ferro-aluminum reductor of 0.15kg/ ton molten steel again.After the refining slag melting that again adds, add the low carbon ferrochromium of 15kg/ ton molten steel in the ladle.Refined molten steel is after 45 minutes in the LF stove, and Cr content is 2.99% in the molten steel after the refining, Si content is 0.27%, Mn content is 0.50%, Mo content is 0.43%, Als content is 0.01%, P content is 0.007%, S content is 0.0022%.
In the LF stove after the refined molten steel, add the silicon-calcium wire of 0.33kg/ ton molten steel in the molten steel and carry out soft blow argon gas 8 minutes to carry out calcification processing.
Molten steel after the calcification processing is carried out the degassed processing of RH circulating vacuum, and wherein, the lift gas flow is 1400NL/ minute, and vacuum tightness is less than 3mbar, and the treatment time is 12 minutes.Process after 12 minutes, keep vacuum tightness, the low carbon ferrochromium, the Al ball of 0.4kg/ ton molten steel and 40 ferrotianiums of 0.8kg/ ton molten steel that add 0.8kg/ ton molten steel in the molten steel carry out alloying.After the alloying, recycling processing 5 minutes is so that molten steel composition is even.
After the degassed processing of RH circulating vacuum, add the silicon-calcium wire of 0.44kg/ ton molten steel in the molten steel and carry out soft blow argon gas 5 minutes to carry out calcification processing.By analysis, molten steel after calcification processing comprises 0.20% C, 0.27% Si, 0.51% Mn, 3.03% Cr, 0.44% Mo, 0.04% Al, 0.018% Ti, 0.008% P, 0.004% S, surplus is iron and inevitable impurity, and the chromium recovery rate of adding is 97%.
At last, adopting continuous casting protection pouring, M-EMS technique to obtain section to the molten steel in the ladle is the high chromium strand of Φ 200mm.
Claims (15)
1. the manufacture method of a high chromium steel may further comprise the steps:
(a) first steel-making water;
(b) be 0.04%～0.10% at the C of molten steel content, P content is not more than 0.010%, when S content is not more than 0.008%, taps to ladle;
(c) in tapping process, the Cr content of adjusting molten steel be 1.8%～2.5% and the oxygen level of adjusting molten steel for being not more than 0.0005%;
(d) oxidisability of ladle slag is adjusted into is not more than 1%;
(e) refined molten steel in ladle refining furnace is adjusted Cr content and is 2.7%～3.0%, S content is for being not more than 0.003%;
(f) molten steel is carried out calcification processing;
(g) molten steel is carried out the degassed processing of circulating vacuum, and the Cr content of adjustment molten steel is 2.8%～3.2%;
(h) molten steel is carried out calcification processing, thereby obtains high chromium steel,
Described high chromium steel comprises 0.15%～0.20% C, 0.15%～0.30% Si, 0.45%～0.60% Mn, 2.8%～3.2% Cr, 0.40%～0.50% Mo, 0.01%～0.04% Al, 0.01%～0.03% Ti, be not more than 0.015% P, be not more than 0.008% S, and the iron of surplus and inevitable impurity, the content of each element is weight percent content in the high chromium steel.
2. manufacture method according to claim 1 is characterized in that, adopts converter just to make steel water in step (a).
3. manufacture method according to claim 1 is characterized in that, adopts ferrochrome to adjust the Cr content of molten steel in step (c).
4. manufacture method according to claim 3 is characterized in that, adopts high carbon ferro-chrome to adjust the Cr content of molten steel in step (c).
5. manufacture method according to claim 1 is characterized in that, adjusts Si content in the molten steel and be 0.15%～0.25% in step (c), Mn content is 0.40%～0.50%, Mo content is 0.40%～0.50%.
6. manufacture method according to claim 5, it is characterized in that, in step (c), adjust Si content, Mn content and Mo content by alloying material being added molten steel, described alloying material comprise for aluminium ferromanganese, manganese metal and the ferromanganese of adjusting Mn content at least a, be used for adjusting the ferrosilicon of Si content and the molybdenum-iron that is used for adjusting Mo content.
7. manufacture method according to claim 1 is characterized in that, adopts ferro-aluminum to adjust the oxygen level of molten steel for being not more than 0.0005% in step (c).
8. manufacture method according to claim 1 is characterized in that, adds the high alumina slag supplying agent in the ladle slag and the oxidisability of ladle slag is adjusted into is not more than 1% in step (d).
9. manufacture method according to claim 1 is characterized in that, adding low carbon ferrochromium in step (e) in the molten steel, to adjust Cr content be 2.7%～3.0%.
10. manufacture method according to claim 1 is characterized in that, the silicon-calcium wire that adds 0.33kg/ ton molten steel～0.55kg/ ton molten steel in the molten steel in step (f) after the ladle refining furnace refining carries out calcification processing.
11. manufacture method according to claim 1 is characterized in that, adding low carbon ferrochromium in step (g) in the molten steel, to adjust the Cr content of molten steel be 2.8%～3.2%.
12. manufacture method according to claim 1 is characterized in that, adding ferrotianium in step (g) in the molten steel, to adjust the Ti content of molten steel be 0.01%～0.03%.
13. manufacture method according to claim 1 is characterized in that, the silicon-calcium wire that adds 0.22kg/ ton molten steel～0.44kg/ ton molten steel in step (h) to circulating vacuum in the molten steel after the degassed processing carries out calcification processing.
14. manufacture method according to claim 1, described manufacture method also are included in step (h) pours into a mould to make steel billet afterwards to molten steel step.
15. high chromium steel, described high chromium steel comprises 0.15%～0.20% C, 0.15%～0.30% Si, 0.45%～0.60% Mn, 2.8%～3.2% Cr, 0.40%～0.50% Mo, 0.01%～0.04% Al, 0.01%～0.03% Ti by weight, be not more than 0.015% P, be not more than 0.008% S, and the iron of surplus and inevitable impurity.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103352168A (en) * | 2013-07-04 | 2013-10-16 | 南京钢铁股份有限公司 | Low-carbon and high-chromium steel and converter smelting technology thereof |
| 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 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031453A (en) * | 2010-10-26 | 2011-04-27 | 攀钢集团钢铁钒钛股份有限公司 | Titaniferous alloy steel and preparation method thereof |
| CN102453831A (en) * | 2010-10-26 | 2012-05-16 | 攀钢集团钢铁钒钛股份有限公司 | Method for smelting high-chromium steel and high-chromium steel |
-
2012
- 2012-12-26 CN CN201210571907.4A patent/CN103045948B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031453A (en) * | 2010-10-26 | 2011-04-27 | 攀钢集团钢铁钒钛股份有限公司 | Titaniferous alloy steel and preparation method thereof |
| CN102453831A (en) * | 2010-10-26 | 2012-05-16 | 攀钢集团钢铁钒钛股份有限公司 | Method for smelting high-chromium steel and high-chromium steel |
Cited By (12)
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| CN103352168A (en) * | 2013-07-04 | 2013-10-16 | 南京钢铁股份有限公司 | Low-carbon and high-chromium steel and converter smelting technology thereof |
| CN103352168B (en) * | 2013-07-04 | 2016-06-15 | 南京钢铁股份有限公司 | A kind of low-carbon high-chromium steel and converter smelting process thereof |
| 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 |
| CN104046738A (en) * | 2014-02-13 | 2014-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting method of ultralow-sulfur high-chromium steel and ultralow-sulfur high-chromium steel prepared by smelting method |
| CN104046738B (en) * | 2014-02-13 | 2015-12-09 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of smelting process of super low sulfur high chromium steel and the super low sulfur high chromium steel of preparation thereof |
| CN105648342A (en) * | 2016-02-26 | 2016-06-08 | 铜陵安东铸钢有限责任公司 | Wear-resistant high-chromium steel and manufacturing method thereof |
| CN105925906A (en) * | 2016-04-18 | 2016-09-07 | 和县隆盛精密机械有限公司 | Bending machine baffle machining method and baffle prepared through same |
| CN106755709A (en) * | 2016-11-25 | 2017-05-31 | 江苏省沙钢钢铁研究院有限公司 | Chromium method is matched somebody with somebody in a kind of converter of low-carbon (LC) containing Cr steel alloys |
| CN106755709B (en) * | 2016-11-25 | 2019-02-01 | 江苏省沙钢钢铁研究院有限公司 | Chromium method is matched in a kind of converter of low-carbon steel alloy containing Cr |
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