CN103045948B - 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 such as, chromium content has anti-C0 at the high chromium steel of about 3%
2, H
2advantages such as the sour gas such as S and can oil casing pipe steel be used as.
Above-mentioned high chromium steel usually carries out alloying obtain by adding ferrochrome in smelting tapping process.Because the chromium content in high chromium steel is comparatively large, so need to add a large amount of ferrochrome in tapping process.But this mode adding 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, the impact of ferrochrome on liquid steel temperature is added in a large number in order to reduce, usually in tapping process, add expensive low carbon ferrochromium, cause the production cost of high chromium steel to increase, and in tapping process, add low carbon ferrochromium limited to the contribution preventing liquid steel temperature from sharply declining.
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 comprises the following steps: (a) just makes steel water; (b) the C content of molten steel be 0.04% ~ 0.10%, P content is not more than 0.010%, S content is not more than 0.008% time, tap to ladle; (c) in tapping process, the Cr content of adjustment molten steel be 1.8% ~ 2.5% and the oxygen level adjusting molten steel for being not more than 0.0005%; D the oxidisability of ladle slag is adjusted to and is not more than 1% by (); E () be refined molten steel in ladle refining furnace, adjustment Cr content is 2.7% ~ 3.0%, S content is for being not more than 0.003%; F () carries out calcification processing to molten steel; G () carries out the degassed process of circulating vacuum to molten steel, and the Cr content adjusting molten steel is 2.8% ~ 3.2%; H () carries out calcification processing to molten steel, thus obtain high chromium steel, described high chromium steel comprise 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 the P of 0.015%, be not more than the S of 0.008%, the iron of surplus and inevitable impurity, in high chromium steel, the content of each element is weight percent content.
According to exemplary embodiment of the present invention, converter can be adopted in step (a) to carry out just to make steel water.
According to exemplary embodiment of the present invention, ferrochrome can be adopted in step (c) to adjust the Cr content of molten steel.
According to exemplary embodiment of the present invention, high carbon ferro-chrome can be adopted in step (c) to adjust the Cr content of molten steel.
According to exemplary embodiment of the present invention, the Si content that can adjust in step (c) in molten steel is 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, can adjust Si content, Mn content and Mo content by alloying material being added molten steel in step (c), alloying material can comprise at least one in aluminium ferromanganese, manganese metal and the ferromanganese for adjusting Mn content, for adjusting the ferrosilicon of Si content and the molybdenum-iron for adjusting Mo content.
According to exemplary embodiment of the present invention, ferro-aluminum can be adopted in step (c) to adjust the oxygen level of molten steel for being not more than 0.0005%.
According to exemplary embodiment of the present invention, high alumina slag supplying agent can be added the oxidisability of ladle slag is adjusted to is not more than 1% in step (d) in ladle slag.
According to exemplary embodiment of the present invention, can add low carbon ferrochromium adjustment Cr content in step (e) in molten steel 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 ladle refining furnace refining carries out calcification processing.
According to exemplary embodiment of the present invention, the Cr content that can add low carbon ferrochromium adjustment molten steel in step (g) in molten steel is 2.8% ~ 3.2%.
According to exemplary embodiment of the present invention, the Ti content that can add ferrotianium adjustment molten steel in step (g) in molten steel is 0.01% ~ 0.03%.
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 step (h) in the molten steel after the degassed process of circulating vacuum 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) and pour into a mould to molten steel the step manufacturing steel billet afterwards.
According to a further aspect in the invention, provide a kind of high chromium steel, this high chromium steel comprise by weight 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 the P of 0.015%, be not more than the S of 0.008%, the iron of surplus and inevitable impurity.
According to the manufacture method of high chromium steel of the present invention, respectively to ladle tapping, in ladle refining furnace refined molten steel and molten steel is carried out to the degassed process of circulating vacuum process in the chromium content in molten steel is adjusted, prevent and once add ferrochrome in a large number and carry out the liquid steel temperature that alloying causes and reduce.In addition, the recovery rate of chromium can be improved by repeatedly adding ferrochrome.
Embodiment
According to high chromium steel of the present invention 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 the P of 0.015%, be not more than the S of 0.008%, and the iron of surplus and inevitable impurity.In this manual, the content of all components related to is weight percent content.
The manufacture method of the high chromium steel with said components is described in detail below with reference to exemplary embodiment.
The manufacture method of high chromium steel comprises and just makes steel water, LF stove refined molten steel and carry out the degassed process of circulating vacuum (that is, the degassed process of RH circulating vacuum) to molten steel according to an exemplary embodiment of the present invention.
First, molten iron can be added in converter, utilize the function of Converter Oxigen Blowing decarburization, be smelt molten steel by the beginning of molten iron.Molten steel will be smelt not by concrete restriction according to an exemplary embodiment of the present invention at the beginning of molten iron.Such as, according to exemplary embodiment of the present invention, low-sulfur hot metal containing V-Ti can be blown in blowing vanadium extracting converter and obtain half steel, then being blown in top and bottom combined blown converter by obtained half steel obtains molten steel.When the C content that molten steel just refines molten steel be 0.04% ~ 0.10%, P content is not more than 0.010%, S content is not more than 0.008% time, tap to ladle.
In tapping process, can add in ladle alloy, reductor and refining slag to the Cr content adjusting molten steel be 1.8% ~ 2.5% and the oxygen level adjusting molten steel for being not more than 0.0005%.According to exemplary embodiment of the present invention, ferrochrome can be added to adjust the Cr content of molten steel in ladle in tapping process, preferably, the Cr content of high carbon ferro-chrome adjustment molten steel can be added in ladle, this is owing to adopting the Cr content of high carbon ferro-chrome adjustment molten steel not only reduce manufacturing cost but also can, to molten steel recarburization, make the carbon content of finally smelting the molten steel obtained reach requirement.But, the present invention is not limited thereto, low carbon ferrochromium or medium carbon ferrochrome can be adopted here to adjust the Cr content of molten steel, and the mode adding separately carburelant can be adopted to carry out carburetting to molten steel.Here, such as, high carbon ferro-chrome can be 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 the trade mark is FeCr
69c
1.0, FeCr
69c
2.0and FeCr
69c
4.0ferrochrome, low carbon ferrochromium can be the trade mark is FeCr
69c
0.25and FeCr
69c
0.50ferrochrome, but 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 thereto.According to exemplary embodiment of the present invention, in tapping process, the reductor of such as ferro-aluminum can be added to adjust the oxygen level of molten steel for being not more than 0.0005% in ladle.
In addition, according to exemplary embodiment of the present invention, in converter tapping process, the alloy of adjustment Mn, Si and Mo content can be added together in ladle with ferrochrome, with the Si content adjusted in molten steel be 0.15% ~ 0.25%, Mn content is 0.40% ~ 0.50%, Mo content is for 0.40% ~ 0.50%.According to exemplary embodiment of the present invention, can be ferrosilicon (FeSi) for adjusting the alloy of Si content, can be at least one in aluminium ferromanganese, manganese metal and ferromanganese (such as low carbon ferromanganese) for adjusting the alloy of Mn content, can be molybdenum-iron (FeMo) for adjusting the alloy of Mo content.Here, Si, Mn, Al in alloying material also have the effect of deoxidation, can play the effect of reductor.
Next, after converter tapping completes, the oxidisability (FeO+MnO) of ladle slag is adjusted to and is not more than 1%, to reduce the oxygen level in molten steel.According to exemplary embodiment of the present invention, high alumina slag supplying agent can be adopted to adjust the oxidisability of ladle slag.
Next, refined molten steel in LF stove is 2.7% ~ 3.0% to adjust Cr content, S content is for being not more than 0.003%.According to exemplary embodiment of the present invention, low carbon ferrochromium can be added to adjust the Cr content of molten steel for 2.7% ~ 3.0% in ladle.In addition, according to exemplary embodiment of the present invention, refining slag can be added in ladle, reductor (such as, ferro-aluminum reductor) controls the compositions such as S, P, Al in molten steel.According to exemplary embodiment of the present invention, the temperature of the molten steel after the refining of LF stove can be 1625 DEG C ~ 1645 DEG C.
Next, after refined molten steel completes in LF stove, calcification processing is carried out to molten steel, with to the Al in molten steel
2o
3carry out denaturing treatment thus 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 ladle refining furnace refining carries out calcification processing.
Next, the degassed process of RH circulating vacuum is carried out to molten steel, and the Cr content adjusting molten steel is 2.8% ~ 3.2%.According to exemplary embodiment of the present invention, low carbon ferrochromium can be added to adjust the Cr content of molten steel for 2.8% ~ 3.2% in ladle.In addition, in the degassed treating processes of RH circulating vacuum, the amount of other alloying constituents can be finely tuned with the composition making the amount of the alloy compositions in molten steel meet expection.According to exemplary embodiment of the present invention, in the degassed treating processes of RH circulating vacuum, 40 ferrotianiums that can add 0.7kg/ ton molten steel ~ 0.9kg/ ton molten steel in molten steel are to adjust Ti content in molten steel for 0.01% ~ 0.03%, being adjusted to by the titanium content of molten steel within the scope of this can the crystal grain of high chromium steel that obtains of refinement, thus improves the intensity of high chromium steel.According to exemplary embodiment of the present invention, the temperature through the molten steel of the degassed process of RH circulating vacuum can be 1575 DEG C ~ 1595 DEG C.
Finally, calcification processing is carried out to molten steel, thus obtains 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 process of RH circulating vacuum carries out calcification processing.
As above can find out the description that the manufacture method of high chromium steel is according to an exemplary embodiment of the present invention carried out, by respectively to ladle tapping, in ladle refining furnace refined molten steel and molten steel is carried out to the degassed process of circulating vacuum process in the chromium content in molten steel is adjusted, can prevent from once adding in a large number ferrochrome to carry out the liquid steel temperature that alloying causes and reduce, and by repeatedly adding the recovery rate that ferrochrome can improve chromium.In addition, the manufacture method of high chromium steel carries out calcification processing and to Al respectively after the refining of LF stove and after the degassed process of RH circulating vacuum according to an exemplary embodiment of the present invention
2o
3be mingled with and carry out modification, therefore, can steel quality be improved.
In addition, after the manufacture completing above-mentioned high chromium steel molten steel, cast can also be carried out to the high chromium steel molten steel obtained to manufacture steel billet.Such as, can obtain to the molten steel employing continuous casting protection pouring in ladle, M-EMS technique the high chromium steel base that section is Φ 200mm.
The manufacture method of high chromium steel of the present invention is further illustrated below in conjunction with example.
Example 1
With the half steel after the vanadium extraction of low-sulfur hot metal containing V-Ti for raw material carries out just making steel water, wherein, half steel comprise by weight percentage 3.70% C, 0.05% Mn, P, the S of 0.0045% of 0.068%, Cr, Si and Ti of the V of 0.033% and tracer level, 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), utilizes the function of top and bottom combined blown converter oxygen decarburization to be smelt molten steel by the beginning of above-mentioned half steel.When molten steel just refines that C content is 0.040%, Mn content is 0.033%, P content is 0.0030%, S content is 0.0052%, temperature is 1688 DEG C, start pushing off the slag and tap in ladle.
In tapping process, the high alkalinity refining slag of 4.5kg/ ton molten steel and the ferro-aluminum reductor of 2.3kg/ ton molten steel is added in ladle, and in ladle, add alloy material carry out molten steel alloying, wherein, the high alkalinity refining slag used in this example comprises the CaO being not less than 70%, the Al being not more than 5% by weight percentage
2o
3, be not more than 5% SiO
2and the CaF of 8% ~ 14%
2.Specifically, 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 in molten steel, Cr content is 2.03%, 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 in converter, molten steel has been tapped, on the ladle top of the slag, add high alumina slag supplying agent 200kg, carry out soft blow argon gas 5 minutes, thus the oxidisability of ladle slag is adjusted to 0.8%, wherein, high alumina slag supplying agent comprises by weight percentage and is not less than the metallic aluminium of 30%, the Al of 5% ~ 15%
2o
3, 6% ~ 12% CaF
2with the CaO being not less than 25%.
In LF stove, refining is carried out to above-mentioned molten steel.In LF stove in refined molten steel process, in ladle, add the high alkalinity refining slag of 1.15kg/ ton molten steel and the ferro-aluminum reductor of 0.15kg/ ton molten steel and heat.When after the high alkalinity refining slag melting added, then 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.When after the refining slag melting again added, in ladle, add the low carbon ferrochromium of 15kg/ ton molten steel.In LF stove, refined molten steel is after 42 minutes, and in the molten steel after refining, Cr content is 2.88%, 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 LF stove after refined molten steel, in molten steel, add the silicon-calcium wire of 0.55kg/ ton molten steel and carry out soft blow argon gas 8 minutes to carry out calcification processing.
Molten steel after calcification processing is carried out the degassed process of RH circulating vacuum, wherein, 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, in molten steel, add the low carbon ferrochromium of 1kg/ ton molten steel, the Al ball of 0.3kg/ ton molten steel and 40 ferrotianiums of 0.9kg/ ton molten steel carry out alloying.After alloying, recycling processing 5 minutes, to make molten steel composition even.
After the degassed process of RH circulating vacuum, in molten steel, add the silicon-calcium wire of 0.22kg/ ton molten steel and carry out soft blow argon gas 5 minutes to carry out calcification processing.By analysis, ladle after calcification processing contains C, the Si of 0.29%, Mn, the Cr of 2.93%, Mo, the Al of 0.02%, Ti, the P of 0.007%, the S of 0.003% of 0.027% of 0.46% of 0.53% of 0.16%, surplus is iron and inevitable impurity, and the rate of recovery of the chromium added is 96%.
Finally, adopting continuous casting protection pouring, M-EMS technique to obtain section to the molten steel in ladle is Φ 200mm height chromium strand.
Example 2
With the half steel after the vanadium extraction of low-sulfur hot metal containing V-Ti for raw material carries out just making steel water, wherein, half steel comprise by weight percentage 3.66% C, 0.045% Mn, P, the S of 0.0033% of 0.077%, Cr, Si and Ti of the V of 0.031% and tracer level, 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), utilizes the function of top and bottom combined blown converter oxygen decarburization to be smelt molten steel by the beginning of above-mentioned half steel.When molten steel just refines that C content is 0.043%, Mn content is 0.032%, P content is 0.0035%, S content is 0.0037%, temperature is 1677 DEG C, start pushing off the slag and tap in ladle.
In tapping process, the high alkalinity refining slag of 4.5kg/ ton molten steel and the ferro-aluminum reductor of 2.5kg/ ton molten steel is added in ladle, and in ladle, add alloy material carry out molten steel alloying, wherein, the high alkalinity refining slag used in this example comprises the CaO being not less than 70%, the Al being not more than 5% by weight percentage
2o
3, be not more than 5% SiO
2and the CaF of 8% ~ 14%
2.Specifically, 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 in molten steel, Cr content is 2.05%, 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 in converter, molten steel has been tapped, on the ladle top of the slag, add high alumina slag supplying agent 200kg, carry out soft blow argon gas 5 minutes, thus the oxidisability of ladle slag is adjusted to 0.9%, wherein, high alumina slag supplying agent comprises by weight percentage and is not less than the metallic aluminium of 30%, the Al of 5% ~ 15%
2o
3, 6% ~ 12% CaF
2with the CaO being not less than 25%.
In LF stove, refining is carried out to above-mentioned molten steel.In LF stove in refined molten steel process, in ladle, add the high alkalinity refining slag of 1.15kg/ ton molten steel and the ferro-aluminum reductor of 0.15kg/ ton molten steel and heat.When after the refining slag melting added, then in ladle, add the refining slag of 1.15kg/ ton molten steel and the ferro-aluminum reductor of 0.15kg/ ton molten steel.When after the refining slag melting again added, in ladle, add the low carbon ferrochromium of 15kg/ ton molten steel.In LF stove, refined molten steel is after 42 minutes, and in the molten steel after refining, Cr content is 2.87%, 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 LF stove after refined molten steel, in molten steel, add the silicon-calcium wire of 0.33kg/ ton molten steel and carry out soft blow argon gas 8 minutes to carry out calcification processing.
Molten steel after calcification processing is carried out the degassed process of RH circulating vacuum, wherein, 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, in molten steel, add the low carbon ferrochromium of 0.8kg/ ton molten steel, the Al ball of 0.5kg/ ton molten steel and 40 ferrotianiums of 0.8kg/ ton molten steel carry out alloying.After alloying, recycling processing 5 minutes, to make molten steel composition even.
After the degassed process of RH circulating vacuum, in molten steel, add 0.44kg/ ton molten steel silicon-calcium wire and carry out soft blow argon gas 5 minutes to carry out calcification processing.By analysis, ladle after calcification processing contains C, the Si of 0.24%, Mn, the Cr of 2.94%, Mo, the Al of 0.04%, Ti, the P of 0.007%, the S of 0.004% of 0.015% of 0.41% of 0.54% of 0.17%, surplus is iron and inevitable impurity, and the rate of recovery of the chromium added is 98%.
Finally, adopting continuous casting protection pouring, M-EMS technique to obtain section to the molten steel in ladle is Φ 200mm height chromium strand.
Example 3
With the half steel after the vanadium extraction of low-sulfur hot metal containing V-Ti for raw material carries out just making steel water, wherein, half steel comprise by weight percentage 3.65% C, 0.04% Mn, P, the S of 0.0042% of 0.072%, Cr, Si and Ti of the V of 0.031% and tracer level, 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), utilizes the function of top and bottom combined blown converter oxygen decarburization to be smelt molten steel by the beginning of above-mentioned half steel.When molten steel just refines that C content is 0.045%, Mn content is 0.031%, P content is 0.005%, S content is 0.0035%, temperature is 1688 DEG C, start pushing off the slag and tap in ladle.
In tapping process, the high alkalinity refining slag of 4.5kg/ ton molten steel and the ferro-aluminum reductor of 2.4kg/ ton molten steel is added in ladle, and in ladle, add alloy material carry out molten steel alloying, wherein, the high alkalinity refining slag used in this example comprises the CaO being not less than 70%, the Al being not more than 5% by weight percentage
2o
3, be not more than 5% SiO
2and the CaF of 8% ~ 14%
2.Specifically, 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 in molten steel, Cr content is 2.10%, 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 in converter, molten steel has been tapped, on the ladle top of the slag, add high alumina slag supplying agent 200kg, carry out soft blow argon gas 5 minutes, thus the oxidisability of ladle slag is adjusted to 0.8%, wherein, high alumina slag supplying agent comprises by weight percentage and is not less than the metallic aluminium of 30%, the Al of 5% ~ 15%
2o
3, 6% ~ 12% CaF
2with the CaO being not less than 25%.
In LF stove, refining is carried out to above-mentioned molten steel.In LF stove in refined molten steel process, in ladle, add the high alkalinity refining slag of 1.15kg/ ton molten steel and the ferro-aluminum reductor of 0.15kg/ ton molten steel and heat.When after the refining slag melting added, then in ladle, add the refining slag of 1.05kg/ ton molten steel and the ferro-aluminum reductor of 0.15kg/ ton molten steel.When after the refining slag melting again added, in ladle, add the low carbon ferrochromium of 15kg/ ton molten steel.In LF stove, refined molten steel is after 45 minutes, and in the molten steel after refining, Cr content is 2.99%, 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 LF stove after refined molten steel, in molten steel, add the silicon-calcium wire of 0.33kg/ ton molten steel and carry out soft blow argon gas 8 minutes to carry out calcification processing.
Molten steel after calcification processing is carried out the degassed process of RH circulating vacuum, wherein, 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, in molten steel, add the low carbon ferrochromium of 0.8kg/ ton molten steel, the Al ball of 0.4kg/ ton molten steel and 40 ferrotianiums of 0.8kg/ ton molten steel carry out alloying.After alloying, recycling processing 5 minutes, to make molten steel composition even.
After the degassed process of RH circulating vacuum, in molten steel, add the silicon-calcium wire of 0.44kg/ ton molten steel and carry out soft blow argon gas 5 minutes to carry out calcification processing.By analysis, ladle after calcification processing contains C, the Si of 0.27%, Mn, the Cr of 3.03%, Mo, the Al of 0.04%, Ti, the P of 0.008%, the S of 0.004% of 0.018% of 0.44% of 0.51% of 0.20%, surplus is iron and inevitable impurity, and the rate of recovery of the chromium added is 97%.
Finally, adopting continuous casting protection pouring, M-EMS technique to obtain section to the molten steel in ladle is Φ 200mm height chromium strand.
Claims (14)
1. a manufacture method for high chromium steel, comprises the following steps:
A () just makes steel water;
(b) the C content of molten steel be 0.04% ~ 0.10%, P content is not more than 0.010%, S content is not more than 0.008% time, tap to ladle;
(c) in tapping process, the Cr content of adjustment molten steel be 1.8% ~ 2.5% and the oxygen level adjusting molten steel for being not more than 0.0005%;
D the oxidisability of ladle slag is adjusted to and is not more than 1% by ();
E () be refined molten steel in ladle refining furnace, adjustment Cr content is 2.7% ~ 3.0%, S content is for being not more than 0.003%;
F () carries out calcification processing to molten steel;
G () carries out the degassed process of circulating vacuum to molten steel, and the Cr content adjusting molten steel is 2.8% ~ 3.2%;
H () carries out calcification processing to molten steel, thus obtain high chromium steel,
Described high chromium steel comprise 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 the P of 0.015%, be not more than the S of 0.008%, and the iron of surplus and inevitable impurity, in high chromium steel, the content of each element is weight percent content.
2. manufacture method according to claim 1, is characterized in that, adopts converter to carry out just to make steel water in step (a).
3. manufacture method according to claim 1, is characterized in that, adopts the Cr content of ferrochrome adjustment molten steel in step (c).
4. manufacture method according to claim 3, is characterized in that, adopts the Cr content of high carbon ferro-chrome adjustment molten steel in step (c).
5. manufacture method according to claim 1, is characterized in that, the Si content in step (c) in adjustment molten steel is 0.15% ~ 0.25%, 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 comprises at least one in aluminium ferromanganese, manganese metal and the ferromanganese for adjusting Mn content, for adjusting the ferrosilicon of Si content and the molybdenum-iron for adjusting Mo content.
7. manufacture method according to claim 1, is characterized in that, adopts the oxygen level of ferro-aluminum adjustment molten steel for being not more than 0.0005% in step (c).
8. manufacture method according to claim 1, is characterized in that, adds high alumina slag supplying agent and the oxidisability of ladle slag be adjusted to and be not more than 1% in step (d) in ladle slag.
9. manufacture method according to claim 1, is characterized in that, in step (e), add low carbon ferrochromium adjustment Cr content in molten steel is 2.7% ~ 3.0%.
10. manufacture method according to claim 1, is characterized in that, the silicon-calcium wire adding 0.33kg/ ton molten steel ~ 0.55kg/ ton molten steel in step (f) in the molten steel after ladle refining furnace refining carries out calcification processing.
11. manufacture method according to claim 1, is characterized in that, the Cr content adding low carbon ferrochromium adjustment molten steel in step (g) in molten steel is 2.8% ~ 3.2%.
12. manufacture method according to claim 1, is characterized in that, the Ti content adding ferrotianium adjustment molten steel in step (g) in molten steel is 0.01% ~ 0.03%.
13. manufacture method according to claim 1, is characterized in that, the silicon-calcium wire adding 0.22kg/ ton molten steel ~ 0.44kg/ ton molten steel in step (h) in the molten steel after the degassed process of circulating vacuum carries out calcification processing.
14. manufacture method according to claim 1, described manufacture method pours into a mould to molten steel the step manufacturing steel billet after being also included in step (h).
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| 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 |
| CN103642967B (en) * | 2013-11-18 | 2015-08-26 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of converter producing high chromium steel |
| 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 |
| CN106755709B (en) * | 2016-11-25 | 2019-02-01 | 江苏省沙钢钢铁研究院有限公司 | Method for preparing chromium from low-carbon Cr-containing alloy steel by converter |
| CN107012287B (en) * | 2017-04-18 | 2019-04-26 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting process for heat stamping and shaping steel |
| CN110257704B (en) * | 2019-06-28 | 2021-08-13 | 河南中原特钢装备制造有限公司 | Pipe die with long service life and anti-cracking deformation and manufacturing method thereof |
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| 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 |
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| 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 |
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