CN113234997A - Novel manganese nitrogen chromium heat-resistant steel and manufacturing method thereof - Google Patents
Novel manganese nitrogen chromium heat-resistant steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of heat-resistant steel, and particularly relates to novel manganese-nitrogen-chromium heat-resistant steel and a manufacturing method thereof. The novel manganese nitrogen chromium heat-resistant steel comprises the following components in percentage by mass: c: 0.32-0.45%, Si: 1.5-2.1%, Mn: 9-12%, P: < 0.04%, S: 0.08-0.15%, Ni: 3.5-7%, Cr: 20-23.5%, Mo: 0.1-0.3%, N: 0.2-0.45%, V: 0.1-0.28%, Nb: 0.5-0.75%, and the balance of Fe and inevitable impurity elements. The heat-resistant steel provided by the components and the manufacturing method provided by the invention has the as-cast normal-temperature tensile strength of 750MPa, the yield strength of more than 500, the elongation of more than 8 percent and the hardness of 220-252HB, and can adapt to the high-temperature working environment.
Description
Technical Field
The invention belongs to the technical field of heat-resistant steel, and particularly relates to novel manganese-nitrogen-chromium heat-resistant steel and a manufacturing method thereof.
Background
The heat-resistant steel is a steel grade used in a high-temperature environment, needs to have enough high-temperature oxidation resistance and high-temperature strength, and is widely applied to relevant industrial production processes, such as a heat treatment furnace nozzle using natural gas as a heat source, a decomposition furnace in the cement industry, a cracking tube in the petrochemical industry and other parts. The loss of the heat-resistant steel is very large due to harsh working conditions, so that the reduction of the cost of the heat-resistant steel and the improvement of the performance have an important effect on improving the economic benefit.
The applicable temperature of the prior heat-resistant steel is mostly below 1000 ℃, and if the prior heat-resistant steel is used in a working environment above 1000 ℃, the prior heat-resistant steel has the defects of insufficient high-temperature oxidation resistance and overhigh cost. For example, in the patent technology of "austenitic heat-resistant cast steel, a preparation method and application thereof" (CN201510952246), although the heat-resistant steel obtained by the patent technology has good comprehensive performance, the heat-resistant steel contains certain amounts of cobalt and molybdenum with higher cost and more than 10 wt% of nickel element, and the addition of nitrogen element also increases the difficulty of smelting control and causes pressure on cost; in addition, the high-temperature oxidation resistant layer of the heat-resistant steel takes Cr 2O 3 as a main composition phase, and CrO2(OH)2 is easily generated in an environment containing water vapor and further volatilizes to cause oxide film cracking, so that the performance of equipment is reduced and the service life is shortened. The patent technology of 'austenitic heat-resistant alloy' (CN201080055959) of Nippon Sumitomo Metal Industrial Co., Ltd is characterized in that the heat-resistant steel obtained by the technology not only has the nickel content of more than 40 wt%, but also contains a certain amount of cobalt, tungsten and molybdenum elements, and if a large amount of the high-cost heat-resistant steel is used, huge pressure is caused to the enterprise cost and natural resources; the heat-resistant steel obtained by the patent technology still takes chromium as a main antioxidant element, the problem of volatilization of CrO2(OH)2 still exists, and the difference between the antioxidant property and the requirement in actual industrial production still exists.
Disclosure of Invention
The invention aims to provide novel manganese nitrogen chromium heat-resistant steel and a manufacturing method thereof aiming at the problems in the prior art, and the heat-resistant steel provided by the components and the manufacturing method provided by the invention has the as-cast normal-temperature tensile strength of 750MPa, the yield strength of more than 500, the elongation of more than 8 percent and the hardness of 220-252HB, and can adapt to the high-temperature working environment.
The technical scheme of the invention is as follows:
the novel manganese nitrogen chromium heat-resistant steel is characterized by comprising the following components in percentage by mass:
c: 0.32-0.45%, Si: 1.5-2.1%, Mn: 9-12%, P: < 0.04%, S: 0.08-0.15%, Ni: 3.5-7%, Cr: 20-23.5%, Mo: 0.1-0.3%, N: 0.2-0.45%, V: 0.1-0.28%, Nb: 0.5-0.75%, and the balance of Fe and inevitable impurity elements.
Specifically, the content of the balance Fe is 56-57.8%.
The novel manganese nitrogen chromium heat-resistant steel comprises the following components in percentage by mass:
c: 0.32-0.45%, Si: 1.5-2.1%, Mn: 9-12%, P: < 0.04%, S: 0.08-0.15%, Ni: 3.5-7%, Cr: 20-23.5%, Mo: 0.1-0.3%, N: 0.2-0.45%, V: 0.1-0.28%, Nb: 0.5-0.75%, the balance being Fe and unavoidable impurity elements;
the manufacturing method comprises the following steps:
s1, adding 32-39.8% of low-carbon steel, 0.15-0.3% of ferro-sulphur and 0.35-0.5% of carburant into an induction furnace for smelting according to the mass percentage, and keeping the smelting temperature at 1550-;
s2, adding 2-2.9% of ferrosilicon, 10-14% of electrolytic manganese, 0.18-0.5% of ferromolybdenum, 0.78-1.16% of ferroniobium and 3.5-7% of electrolytic nickel plate in percentage by mass into an induction furnace for smelting continuously;
s3, when furnace burden in the furnace accounts for 40-60% of the capacity of the furnace, adding 33.3-39% of ferrochrome, 4-7.8% of chromium nitride and 0.2-0.6% of ferrovanadium in percentage by mass for continuous smelting;
and S4, tapping after the temperature measurement value reaches 1600-.
Specifically, the method also comprises a furnace deoxidation step, specifically, a compound deoxidizer accounting for 0.3 percent of the capacity of the induction furnace is added when the molten material is added in the step S2.
Specifically, the composite deoxidizer comprises the following components in percentage by mass: 32-35.5% of Si, 18-22% of Ca, 16-19.5% of Ba, 7.5-10.5% of Al, the balance of Fe and inevitable impurity elements, the balance of Fe is 56-57.8%, and the particle size of the composite deoxidizer is 1-6 mm.
Specifically, the method comprises an in-ladle deoxidation step, wherein the in-ladle deoxidation step is carried out before tapping, specifically, a deoxidizer accounting for 0.3% of the weight of the tapped iron and a rare earth inoculant accounting for 0.2% of the weight of the tapped iron are mixed and then put into the bottom of a casting ladle, then, the steel is rapidly tapped, the time interval between the mixed deoxidizer and the rare earth inoculant being put into the casting ladle and the tapping is less than 20S, and normal slag removal and casting are carried out after the tapping is finished.
Specifically, the rare earth inoculant comprises the following components in percentage by mass: 44-48% of Si, 30-32.5% of E, 2-5.5% of Ba, 0.6-2.8% of Ca, and the balance of Fe and inevitable impurity elements, wherein the content of the balance Fe is 56-57.8%, and the particle size of the rare earth inoculant is 1-6 mm.
Specifically, the deoxidizer has the same components as the compound deoxidizer used in the deoxidation step in the furnace.
The applicable temperature of the prior heat-resistant steel is mostly below 1000 ℃, and if the prior heat-resistant steel is used in a working environment above 1000 ℃, the prior heat-resistant steel has the defects of insufficient high-temperature oxidation resistance and overhigh cost. In addition, the following defects exist: firstly, during smelting, the oxidation is serious, the requirement on a deoxidation process is strict, a strict charging sequence and smelting temperature control are required, the pouring needs to ensure sealing, and secondary oxidation is avoided; secondly, the temperature difference between the liquid phase and the solid phase is very small, the pouring temperature is controlled strictly and needs to be more than 1470 ℃. And thirdly, an exhaust system needs to be made, and the defect of dense air holes is avoided.
The invention has the beneficial effects that: the heat-resistant steel produced by using the components has the following characteristics: firstly, the as-cast normal-temperature tensile strength reaches 750MPa, the yield strength is more than 500, the elongation is more than 8 percent, and the hardness is 220-252 HB; secondly, the carbide content in an austenite matrix structure is less than 15 percent, the high-temperature ferrite content is less than 12 percent, the actual grain size is 5-5.5, the grains are fine, the structure is compact, the carbide is uniformly distributed, the toughness is good, the cutting and chip breaking are good, and a casting with a complex structure can be directly produced; the high-temperature performance is excellent, the high-temperature static strength at 1050 ℃ reaches 40-50MPA, and the high-temperature static strength is suitable for a high-temperature working environment; fourthly, the cost is low, and compared with DIN 1.4837 heat-resistant steel, the material cost is reduced by more than 40%; due to high manganese content, the wear-resisting steel has better wear resistance and can be applied to the field of high-temperature wear-resisting parts.
In addition, the content of carbon element and alloy element which is easy to combine with carbon is optimized to form dispersed carbide which is precipitated at the crystal boundary to fix the crystal boundary and prevent the crystal grain from growing excessively; or a pinning dislocation strengthening matrix is precipitated in the crystal grains; the carbides can also improve the high-temperature wear resistance of the heat-resistant steel, generally, the high-temperature oxidation resistance of the alloy is considered to be unfavorable due to the excessively high carbon content, and the invention compensates for the weakening of the carbon element in oxidation resistance by optimizing the content of other oxidation resistant elements, so that the invention adds 0.32-0.45% of carbon, so that the prepared heat-resistant steel has good wear resistance, and the production cost can be controlled at a lower level.
Si: the silicon is beneficial to improving the oxidation resistance and corrosion resistance of the heat-resistant steel at high temperature, and the proper amount of silicon has a promoting effect on the generation of chromium oxide and aluminum oxide, so that the high-temperature oxidation resistance of the alloy is further enhanced. Silicon can be combined with chromium and oxygen on the surface of the heat-resistant steel at high temperature to form an olivine structure, the chromium atoms are surrounded in an approximately planar band structure by the special lattice structure of the silicon, but not wrapped in common tetrahedral or octahedral gaps, which is favorable for the diffusion of chromium, and the chromium is an important antioxidant element, so that the high-temperature oxidation resistance of the heat-resistant steel is enhanced. Therefore, the silicon content of the invention is controlled to be 1.5-2.1%, so that the surface of the prepared heat-resistant steel generates enough olivine structure, and further excellent high-temperature oxidation resistance is obtained on the premise of keeping lower cost.
Mn: manganese in the heat-resistant steel has strong affinity to harmful elements such as sulfur and the like, and can be fixed in the smelting process, so that the hot cracking tendency of the heat-resistant steel in the subsequent forming process can be effectively reduced, the yield of the product is improved, and the cost is reduced; meanwhile, the impact toughness of the heat-resistant steel can be improved by adding manganese, but the creep strength of the heat-resistant steel can be reduced by excessive manganese content, so that the manganese content of the heat-resistant steel is controlled to be 9-12%, and the yield of the prepared heat-resistant steel is improved on the premise of keeping good creep strength and high-temperature oxidation resistance, so that the cost is reduced.
Cr: chromium is one of the main antioxidant elements in heat resistant steel. Due to the action of electrochemical potential, chromium tends to generate a continuous compact spinel oxidation-resistant layer on the surface of the heat-resistant steel, and separates a matrix from external oxidizing atmosphere to prevent further oxidation reaction; the chromium element can generate a synergistic effect with the silicon element and the aluminum element, so that the high-temperature oxidation resistance of the heat-resistant steel is further improved; in addition, the chromium element can also improve the heat strength of the heat-resistant steel. The chromium content of the invention is controlled to be 20-23.5%, so that the prepared heat-resistant steel has good high-temperature oxidation resistance while maintaining enough heat strength.
V: vanadium and carbon have strong affinity, and form corresponding stable carbide together with the vanadium and the carbon, and the stable carbide is dispersed in the heat-resistant steel, can appear in crystal and can also appear in crystal boundary, so that the strengthening effect is achieved. The invention controls the vanadium content to be 0.1-0.28%, and maintains good high-temperature strength while ensuring that the prepared heat-resistant steel has excellent high-temperature oxidation resistance.
P is less than 0.04%, harmful elements are contained, and the content is controlled to be lower as much as possible.
S: the manganese sulfide is preferentially combined with Mn in steel to form manganese sulfide with a high melting point of about 1620 ℃, is distributed in grains in a granular shape, has certain formability at high temperature, improves hot brittleness, has an obvious chip breaking effect, controls the S content to be 0.08-0.15%, and improves the cutting processability of the steel.
Ni: nickel can be infinitely dissolved with iron, is a main element for forming and stabilizing austenite, does not generate carbide with carbon, is beneficial to controlling the content of the carbide, can improve the heat resistance and the corrosion resistance of steel, but is expensive, so the content is controlled within the range of 3.5-7%.
Mo: mo is a commonly used element for increasing the heat strength, can effectively prevent the coarsening of austenite crystal grains and can improve the normal temperature hardness of steel, but is expensive, so the content is controlled within the range of 0.1-0.3%.
N: the content of N in the steel containing vanadium and niobium is controlled within the range of 0.2-0.45%, the compound has strong effects of refining and strengthening crystal grains, and the compound is precipitated on the grain boundary to improve the high-temperature strength of the grain boundary, so that the high-temperature creep strength is increased.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the specific embodiments.
Example 1
The embodiment provides a novel manganese nitrogen chromium heat-resistant steel and a manufacturing method thereof, and the novel manganese nitrogen chromium heat-resistant steel comprises the following components in percentage by mass:
c: 0.45%, Si: 2.1%, Mn: 12%, P: < 0.04%, S: 0.15%, Ni: 7%, Cr: 23.5%, Mo: 0.3%, N: 0.45%, V: 0.28%, Nb: 0.75 percent, the balance of Fe and inevitable impurity elements, and the balance of Fe is 57.8 percent.
The manufacturing method comprises the following steps:
s1, adding 32% of low-carbon steel, 0.15% of ferro-sulphur and 0.35% of carburant into an induction furnace for smelting according to the mass percentage, and keeping the smelting temperature at 1550 ℃;
s2, adding 2% of ferrosilicon, 10% of electrolytic manganese, 0.18% of ferromolybdenum, 0.78% of ferroniobium and 3.5% of electrolytic nickel plate into an induction furnace for smelting continuously, and simultaneously adding a composite deoxidizer accounting for 0.3% of the capacity of the induction furnace, wherein the composite deoxidizer comprises the following components in percentage by mass: 32% of Si, 18% of Ca, 16% of Ba, 7.5% of Al, the balance of Fe and inevitable impurity elements, the balance of Fe is 56%, and the particle size of the composite deoxidizer is 1 mm;
s3, when furnace burden in the furnace accounts for 40% of the capacity of the furnace, 39% of ferrochrome, 7.8% of chromium nitride and 0.6% of ferrovanadium are added by mass percent for continuous smelting;
s4, tapping after the temperature measurement value reaches 1600 ℃ by using a thermocouple temperature measuring gun, standing for 7min at high temperature, and carrying out in-ladle deoxidation before tapping, wherein the in-ladle deoxidation step is carried out before tapping, specifically, a deoxidizer accounting for 0.3% of the weight of the tapped iron and a rare earth inoculant accounting for 0.2% of the weight of the tapped iron are mixed and then put into the bottom of a casting ladle, then fast tapping inoculation is carried out, the time interval of putting the mixed deoxidizer and the rare earth inoculant into the ladle and tapping is ensured to be less than 20S, normal slag removal and casting are carried out after tapping is finished, and the rare earth inoculant comprises the following components in percentage by mass: 44% of Si, 30% of E, 2% of Ba, 0.6% of Ca, the balance of Fe and inevitable impurity elements, the balance of Fe is 56%, and the particle size of the rare earth inoculant is 1 mm.
And after tapping, normally removing slag and pouring, and paying attention to the fact that a pouring ladle needs to be sealed by a special ladle cover to avoid being exposed in air. The method is used for deoxidation, during the deoxidation, oxidation reaction promotes the floating of a large amount of impurities of the steel grade, simultaneously brings out a large amount of gas of the steel grade, greatly reduces the dissolved oxygen amount of the steel grade, reduces the total gas amount of the steel grade, reduces the proportion of defects of pores, effectively reduces the generation of secondary oxidation slag in molten steel, reduces the proportion of slag pores, improves the relative fluidity due to the improvement of the purity of the molten steel, and reduces the defects brought by partial molding materials, such as sand holes and coating falling to a certain extent.
Example 2
The novel manganese nitrogen chromium heat-resistant steel comprises the following components in percentage by mass:
c: 0.4%, Si: 2%, Mn: 102%, P: < 0.04%, S: 0.1%, Ni: 6%, Cr: 22%, Mo: 0.2%, N: 0.3%, V: 0.2%, Nb: 0.6 percent, the balance of Fe and inevitable impurity elements, and the balance of Fe is 57 percent.
The manufacturing method comprises the following steps:
s1, adding 36% of low-carbon steel, 0.2% of ferro-sulphur and 0.4% of carburant into an induction furnace for smelting according to mass percentage, and keeping the smelting temperature at 1600 ℃;
s2, adding 2.6% of ferrosilicon, 12% of electrolytic manganese, 0.3% of ferromolybdenum, 1.01% of ferroniobium and 5% of electrolytic nickel plate into an induction furnace for smelting continuously, and simultaneously adding a composite deoxidizer accounting for 0.3% of the capacity of the induction furnace, wherein the composite deoxidizer comprises the following components in percentage by mass: 35.5% of Si, 22% of Ca, 19.5% of Ba, 10.5% of Al, the balance of Fe and inevitable impurity elements, the balance of Fe is 57.8%, the balance of Fe is 57%, and the particle size of the composite deoxidizer is 2 mm;
s3, when the furnace burden accounts for 60 percent of the capacity of the furnace, adding 36 percent of ferrochrome, 7.1 percent of chromium nitride and 0.4 percent of ferrovanadium in percentage by mass for continuous smelting;
s4, tapping after the temperature measurement value reaches 1620 ℃ by using a thermocouple temperature measuring gun and standing for 7min at high temperature, further comprising an in-ladle deoxidation step, wherein the in-ladle deoxidation step is carried out before tapping, specifically, a deoxidizer accounting for 0.3% of the weight of the tapped iron and a rare earth inoculant accounting for 0.2% of the weight of the tapped iron are mixed and then put into the bottom of a casting ladle, then rapid tapping is carried out, the time interval between the adding of the mixed deoxidizer and the rare earth inoculant and tapping is less than 20S, normal slag removal and casting are carried out after tapping is finished, and the rare earth inoculant comprises the following components in percentage by mass: 48 percent of Si, 32.5 percent of E, 5.5 percent of Ba, 2.8 percent of Ca, and the balance of Fe and inevitable impurity elements, wherein the particle size of the rare earth inoculant is 3 mm.
And after tapping, normally removing slag and pouring, and paying attention to the fact that a pouring ladle needs to be sealed by a special ladle cover to avoid being exposed in air.
And after tapping, normally removing slag and pouring, and paying attention to the fact that a pouring ladle needs to be sealed by a special ladle cover to avoid being exposed in air. The method is used for deoxidation, during the deoxidation, oxidation reaction promotes the floating of a large amount of impurities of the steel grade, simultaneously brings out a large amount of gas of the steel grade, greatly reduces the dissolved oxygen amount of the steel grade, reduces the total gas amount of the steel grade, reduces the proportion of defects of pores, effectively reduces the generation of secondary oxidation slag in molten steel, reduces the proportion of slag pores, improves the relative fluidity due to the improvement of the purity of the molten steel, and reduces the defects brought by partial molding materials, such as sand holes and coating falling to a certain extent.
Example 3
The novel manganese nitrogen chromium heat-resistant steel comprises the following components in percentage by mass:
c: 0.38%, Si: 1.8%, Mn: 11%, P: < 0.04%, S: 0.10%, Ni: 5%, Cr: 21.5%, Mo: 0.2%, N: 0.35%, V: 0.228%, Nb: 0.65 percent of Fe and inevitable impurity elements, and the balance of Fe is 56.9 percent.
The manufacturing method comprises the following steps:
s1, adding 35.8% of low-carbon steel, 0.25% of ferro-sulphur and 0.44% of carburant into an induction furnace for smelting according to the mass percentage, and keeping the smelting temperature at 1620 ℃;
s2, adding 2.4% of ferrosilicon, 13% of electrolytic manganese, 0.36% of ferromolybdenum, 0.98% of ferroniobium and 5.9% of electrolytic nickel plate into an induction furnace for smelting continuously, and simultaneously adding a composite deoxidizer accounting for 0.3% of the capacity of the induction furnace, wherein the composite deoxidizer comprises the following components in percentage by mass: 35% of Si, 20% of Ca, 19% of Ba, 10% of Al, the balance of Fe and inevitable impurity elements, the balance of Fe is 57%, and the particle size of the composite deoxidizer is 3 mm;
s3, when furnace burden accounts for 50% of the capacity of the furnace, 35% of ferrochrome, 6.8% of chromium nitride and 0.4% of ferrovanadium are added by mass percent for continuous smelting;
s4, tapping after the temperature measurement value reaches 1640 ℃ by using a thermocouple temperature measuring gun and standing for 5min at high temperature, further comprising an in-ladle deoxidation step, wherein the in-ladle deoxidation step is carried out before tapping, specifically, a deoxidizer accounting for 0.3% of the weight of the tapped iron and a rare earth inoculant accounting for 0.2% of the weight of the tapped iron are mixed and then put into the bottom of a casting ladle, then rapid tapping is carried out, the time interval between the putting of the mixed deoxidizer and the rare earth inoculant and tapping is less than 20S, normal slag removal and casting are carried out after tapping is finished, and the rare earth inoculant comprises the following components in percentage by mass: 44-48% of Si, 32% of E, 5% of Ba, 2% of Ca and the balance of Fe and inevitable impurity elements, wherein the content of the balance Fe is 56.9%, and the particle size of the rare earth inoculant is 4 mm.
And after tapping, normally removing slag and pouring, and paying attention to the fact that a pouring ladle needs to be sealed by a special ladle cover to avoid being exposed in air.
And after tapping, normally removing slag and pouring, and paying attention to the fact that a pouring ladle needs to be sealed by a special ladle cover to avoid being exposed in air. The method is used for deoxidation, during the deoxidation, oxidation reaction promotes the floating of a large amount of impurities of the steel grade, simultaneously brings out a large amount of gas of the steel grade, greatly reduces the dissolved oxygen amount of the steel grade, reduces the total gas amount of the steel grade, reduces the proportion of defects of pores, effectively reduces the generation of secondary oxidation slag in molten steel, reduces the proportion of slag pores, improves the relative fluidity due to the improvement of the purity of the molten steel, and reduces the defects brought by partial molding materials, such as sand holes and coating falling to a certain extent.
Example 4
The novel manganese nitrogen chromium heat-resistant steel comprises the following components in percentage by mass:
c: 0.32%, Si: 1.5%, Mn: 9%, P: < 0.04%, S: 0.08%, Ni: 3.5%, Cr: 20%, Mo: 0.1%, N: 0.2%, V: 0.1%, Nb: 0.5 percent, the balance of Fe and inevitable impurity elements, and the balance of Fe is 56 percent.
The manufacturing method comprises the following steps:
s1, adding 36.8% of low-carbon steel, 0.25% of ferro-sulphur and 0.45% of carburant into an induction furnace for smelting according to the mass percentage, and keeping the smelting temperature at 1650 ℃;
s2, adding 2.7% of ferrosilicon, 12% of electrolytic manganese, 0.35% of ferromolybdenum, 1.09% of ferroniobium and 5% of electrolytic nickel plate into an induction furnace for smelting continuously, and simultaneously adding a composite deoxidizer accounting for 0.3% of the capacity of the induction furnace, wherein the composite deoxidizer comprises the following components in percentage by mass: 34% of Si, 19% of Ca, 18% of Ba, 8.5% of Al, the balance of Fe and inevitable impurity elements, the balance of Fe content is 56.8%, and the particle size of the composite deoxidizer is 5 mm;
s3, when the furnace burden accounts for 60 percent of the capacity of the furnace, adding 36.4 percent of ferrochrome, 5.9 percent of chromium nitride and 0.48 percent of ferrovanadium by mass percent for continuous smelting;
s4, tapping after the temperature measurement value reaches 1640 ℃ by using a thermocouple temperature measuring gun and standing for 7min at high temperature, further comprising an in-ladle deoxidation step, wherein the in-ladle deoxidation step is carried out before tapping, specifically, a deoxidizer accounting for 0.3% of the weight of the tapped iron and a rare earth inoculant accounting for 0.2% of the weight of the tapped iron are mixed and then put into the bottom of a casting ladle, then rapid tapping is carried out, the time interval between the putting of the mixed deoxidizer and the rare earth inoculant and tapping is less than 20S, normal slag removal and casting are carried out after tapping is finished, and the rare earth inoculant comprises the following components in percentage by mass: 46 percent of Si, 31.5 percent of E, 4.5 percent of Ba, 1.8 percent of Ca, the balance of Fe and inevitable impurity elements, the balance of Fe is 56 percent, and the particle size of the rare earth inoculant is 5 mm.
And after tapping, normally removing slag and pouring, and paying attention to the fact that a pouring ladle needs to be sealed by a special ladle cover to avoid being exposed in air.
And after tapping, normally removing slag and pouring, and paying attention to the fact that a pouring ladle needs to be sealed by a special ladle cover to avoid being exposed in air. The method is used for deoxidation, during the deoxidation, oxidation reaction promotes the floating of a large amount of impurities of the steel grade, simultaneously brings out a large amount of gas of the steel grade, greatly reduces the dissolved oxygen amount of the steel grade, reduces the total gas amount of the steel grade, reduces the proportion of defects of pores, effectively reduces the generation of secondary oxidation slag in molten steel, reduces the proportion of slag pores, improves the relative fluidity due to the improvement of the purity of the molten steel, and reduces the defects brought by partial molding materials, such as sand holes and coating falling to a certain extent.
Example 5
The novel manganese nitrogen chromium heat-resistant steel comprises the following components in percentage by mass:
c: 0.40%, Si: 2.0%, Mn: 10%, P: < 0.04%, S: 0.10%, Ni: 6%, Cr: 23.0%, Mo: 0.2%, N: 0.40%, V: 0.20%, Nb: 0.70 percent of Fe and inevitable impurity elements, wherein the content of the balance Fe is 57.0 percent.
The manufacturing method comprises the following steps:
s1, adding 39.0% of low-carbon steel, 0.2% of pyrite and 0.45% of carburant into an induction furnace for smelting according to the mass percentage, and keeping the smelting temperature at 1650 ℃;
s2, adding 2.8% of ferrosilicon, 13% of electrolytic manganese, 0.4% of ferromolybdenum, 1.10% of ferroniobium and 5.6% of electrolytic nickel plate into an induction furnace for smelting continuously, and simultaneously adding a composite deoxidizer accounting for 0.3% of the capacity of the induction furnace, wherein the composite deoxidizer comprises the following components in percentage by mass: 33.5 percent of Si, 19 percent of Ca, 17.5 percent of Ba, 9.5 percent of Al, the balance of Fe and inevitable impurity elements, the balance of Fe is 56.4 percent, and the particle size of the composite deoxidizer is 6 mm;
s3, when the furnace burden accounts for 60 percent of the capacity of the furnace, 38 percent of ferrochrome, 6.8 percent of chromium nitride and 0.4 percent of ferrovanadium are added in the furnace in percentage by mass for continuous smelting;
s4, tapping after the temperature measurement value reaches 1640 ℃ by using a thermocouple temperature measuring gun and standing for 7min at high temperature, further comprising an in-ladle deoxidation step, wherein the in-ladle deoxidation step is carried out before tapping, specifically, a deoxidizer accounting for 0.3% of the weight of the tapped iron and a rare earth inoculant accounting for 0.2% of the weight of the tapped iron are mixed and then put into the bottom of a casting ladle, then rapid tapping is carried out, the time interval between the putting of the mixed deoxidizer and the rare earth inoculant and tapping is less than 20S, normal slag removal and casting are carried out after tapping is finished, and the rare earth inoculant comprises the following components in percentage by mass: 44-48% of Si, 31.5% of E, 3.5% of Ba, 1.5% of Ca, and the balance of Fe and inevitable impurity elements, wherein the content of the balance Fe is 57.0%, and the particle size of the rare earth inoculant is 6 mm.
And after tapping, normally removing slag and pouring, and paying attention to the fact that a pouring ladle needs to be sealed by a special ladle cover to avoid being exposed in air. The method is used for deoxidation, during the deoxidation, oxidation reaction promotes the floating of a large amount of impurities of the steel grade, simultaneously brings out a large amount of gas of the steel grade, greatly reduces the dissolved oxygen amount of the steel grade, reduces the total gas amount of the steel grade, reduces the proportion of defects of pores, effectively reduces the generation of secondary oxidation slag in molten steel, reduces the proportion of slag pores, improves the relative fluidity due to the improvement of the purity of the molten steel, and reduces the defects brought by partial molding materials, such as sand holes and coating falling to a certain extent.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (8)
1. The novel manganese nitrogen chromium heat-resistant steel is characterized by comprising the following components in percentage by mass:
c: 0.32-0.45%, Si: 1.5-2.1%, Mn: 9-12%, P: < 0.04%, S: 0.08-0.15%, Ni: 3.5-7%, Cr: 20-23.5%, Mo: 0.1-0.3%, N: 0.2-0.45%, V: 0.1-0.28%, Nb: 0.5-0.75%, and the balance of Fe and inevitable impurity elements.
2. The new Mn-N-Cr heat-resistant steel as claimed in claim 1, wherein the residual Fe content is 56-57.8%.
3. The manufacturing method of the novel manganese nitrogen chromium heat-resistant steel is characterized by comprising the following components in percentage by mass:
c: 0.32-0.45%, Si: 1.5-2.1%, Mn: 9-12%, P: < 0.04%, S: 0.08-0.15%, Ni: 3.5-7%, Cr: 20-23.5%, Mo: 0.1-0.3%, N: 0.2-0.45%, V: 0.1-0.28%, Nb: 0.5-0.75%, the balance being Fe and unavoidable impurity elements;
the manufacturing method comprises the following steps:
s1, adding 32-39.8% of low-carbon steel, 0.15-0.3% of ferro-sulphur and 0.35-0.5% of carburant into an induction furnace for smelting according to the mass percentage, and keeping the smelting temperature at 1550-;
s2, adding 2-2.9% of ferrosilicon, 10-14% of electrolytic manganese, 0.18-0.5% of ferromolybdenum, 0.78-1.16% of ferroniobium and 3.5-7% of electrolytic nickel plate in percentage by mass into an induction furnace for smelting continuously;
s3, when furnace burden in the furnace accounts for 40-60% of the capacity of the furnace, adding 33.3-39% of ferrochrome, 4-7.8% of chromium nitride and 0.2-0.6% of ferrovanadium in percentage by mass for continuous smelting;
and S4, tapping after the temperature measurement value reaches 1600-.
4. The method for producing Mn-N-Cr heat-resistant steel as claimed in claim 3, further comprising a step of deoxidation in the furnace, in which a compound deoxidizer is added in an amount of 0.3% of the capacity of the induction furnace when the molten material is added in step S2.
5. The method for producing a manganese-nitrogen-chromium heat-resistant steel as claimed in claim 4, wherein said complex deoxidizer comprises the following components in mass percent: 32-35.5% of Si, 18-22% of Ca, 16-19.5% of Ba, 7.5-10.5% of Al, the balance of Fe and inevitable impurity elements, the balance of Fe is 56-57.8%, and the particle size of the composite deoxidizer is 1-6 mm.
6. The method for manufacturing a Mn-N-Cr heat-resistant steel as claimed in claim 3, further comprising an in-ladle deoxidation step, wherein the in-ladle deoxidation step is performed before tapping, and specifically, a deoxidizer accounting for 0.3% of the weight of the tapped iron and a rare earth inoculant accounting for 0.2% of the weight of the tapped iron are mixed and then poured into the bottom of the casting ladle, and then tapping is performed rapidly, so that the time interval between the pouring of the mixed deoxidizer and the rare earth inoculant and the tapping is ensured to be less than 20S, and normal slag removal and casting are performed after the tapping is finished.
7. The novel Mn-N-Cr heat-resistant steel as claimed in claim 6, wherein the rare earth inoculant comprises the following components in percentage by mass: 44-48% of Si, 30-32.5% of E, 2-5.5% of Ba, 0.6-2.8% of Ca, and the balance of Fe and inevitable impurity elements, wherein the content of the balance Fe is 56-57.8%, and the particle size of the rare earth inoculant is 1-6 mm.
8. A new Mn-N-Cr heat-resistant steel as claimed in claim 6, wherein said deoxidizer is the same in composition as the complex deoxidizer used in the deoxidation step in the furnace.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117428153A (en) * | 2023-10-13 | 2024-01-23 | 江阴宏创动能科技有限公司 | High-strength high-temperature oxidation-resistant grate bar and preparation method thereof |
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