CN111455260A - Smelting process for producing ultra-low carbon phosphorus-nickel series steel by using high phosphorus molten iron - Google Patents

Abstract

The invention discloses a smelting process for producing ultra-low carbon phosphorus nickel series steel by using high phosphorus molten iron, which relates to the technical field of steel smelting, wherein a converter is adopted for smelting, the phosphorus content of the used molten iron is 0.130-0.150%, a method of early slag retention and later slag dual-stage is adopted, the smelting end point temperature is 1580-1620 ℃, the bottom stirring flow rate in the middle and later stages of smelting is 350-400N L/min, the final slag alkalinity is 4.0, the final slag control amount is 10-12 tons, the decarburization rate of the converter is more than or equal to 99%, the dephosphorization rate is more than or equal to 96%, the converter process is optimized, and the nickel series steel smelting process meets the industrial production requirements of batches.

Description

Smelting process for producing ultra-low carbon phosphorus-nickel series steel by using high phosphorus molten iron

Technical Field

The invention relates to the technical field of steel smelting, in particular to a smelting process for producing ultralow-carbon phosphorus-nickel series steel by using high-phosphorus molten iron.

Background

With the rapid development of L NG conveying and storage technology, 9Ni steel can be widely applied due to its excellent toughness in an ultralow temperature environment of-196 ℃.

Disclosure of Invention

Aiming at the technical problems, the invention overcomes the defects of the prior art, provides a smelting process for producing the ultra-low carbon phosphorus-nickel series steel by using the high phosphorus molten iron, improves the decarburization and dephosphorization rate of the converter by adopting a method for improving the smelting capability of the converter, and meets the production requirement of producing the ultra-low carbon phosphorus steel by using the high phosphorus molten iron.

In order to solve the technical problems, the invention provides a smelting process for producing ultra-low carbon phosphorus-nickel series steel by using high phosphorus molten iron, and the smelting process comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, Si: 0.1-0.3%, Mn: 0.5% -0.8%, Ni: 8.8% -9.2%, Alt: 0.015-0.050%, S is less than or equal to 0.002%, P is less than or equal to 0.005%, N is less than or equal to 0.005%, and the balance of Fe and irremovable impurities;

the converter smelting is adopted, the phosphorus content of the used molten iron is 0.130-0.150%, the method of early-stage slag retention and later-stage slag retention is adopted, the smelting end point temperature is 1580-1620 ℃, the bottom stirring flow rate in the middle and later stages of smelting is 350-400N L/min, the final slag alkalinity is 4.0, the final slag control amount is 10-12 tons, and the decarburization rate of the converter is not less than 99%, and the dephosphorization rate is not less than 96%.

The technical effects are as follows: the invention optimizes the converter process, shortens the smelting period of the nickel-based steel from 50-60 min to 40-45 min, and meets the requirement of batch industrial production; meanwhile, the purpose of producing the ultra-low carbon phosphorus nickel series steel by the high phosphorus molten iron is realized, and the product performance is qualified.

The technical scheme of the invention is further defined as follows:

the smelting process for producing the ultra-low carbon phosphorus nickel series steel by using the high phosphorus molten iron comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, Si: 0.1-0.2%, Mn: 0.5% -0.6%, Ni: 9.0% -9.2%, Alt: 0.015-0.040%, S is less than or equal to 0.002%, P is less than or equal to 0.005%, N is less than or equal to 0.005%, and the balance is Fe and irremovable impurities.

The smelting process for producing the ultra-low carbon phosphorus nickel series steel by using the high phosphorus molten iron comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, Si: 0.2-0.3%, Mn: 0.6-0.7%, Ni: 8.9% -9.1%, Alt: 0.020-0.050%, S is less than or equal to 0.002%, P is less than or equal to 0.005%, N is less than or equal to 0.005%, and the balance of Fe and irremovable impurities.

The smelting process for producing the ultra-low carbon phosphorus nickel series steel by using the high phosphorus molten iron comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, Si: 0.15-0.25%, Mn: 0.7% -0.8%, Ni: 8.8% -9.0%, Alt: 0.015-0.040%, S is less than or equal to 0.002%, P is less than or equal to 0.005%, N is less than or equal to 0.005%, and the balance is Fe and irremovable impurities.

The smelting process for producing the ultra-low carbon phosphorus nickel series steel by using the high phosphorus molten iron specifically comprises the following steps:

s1, the charging amount of molten iron is 150 +/-5 tons, molten iron pretreatment is carried out after the molten iron is poured out of a tank, desulfurization operation is carried out, slag skimming is ensured to be clean after the desulfurization, and S of molten iron entering the furnace is less than or equal to 0.0020 percent;

s2, feeding the nickel plate into the furnace together with the scrap steel, wherein the loading amount is 20 +/-5 tons, and the adding amount of the nickel plate is 14 tons;

s3, performing slag pouring operation after slag splashing of the converter, pouring slag and reserving slag, wherein the slag quantity is 2-3 tons, adding waste steel which is regular in shape and free of impurities and oxidation on the surface after slag pouring is finished, adding the waste steel, shaking the converter back and forth, adding molten iron, and adding the waste steel to ensure that the product components still meet the requirements;

s4, adjusting the lance position, adding raw and auxiliary materials in time, ensuring the whole melting process of the slag, and controlling the bottom stirring flow at 180-200N L/min in the early stage of smelting;

s5, calculating the blowing oxygen supply amount according to the molten iron loading amount and the molten iron components, and sampling at the sublance temperature measurement temperature when the blowing oxygen supply amount reaches 83-88%, wherein the carbon hit range is 0.20-0.40%, and the temperature hit range is 1580-1620 ℃;

s6, after the sublance measurement is finished, lifting the sublance when the carbon content is calculated to be 0.20% -0.30% and the temperature is 1580-1620 ℃, and performing deslagging treatment after lifting the sublance, wherein the residue amount is 10 tons after deslagging;

s7, discharging slag, blowing with a gun, controlling the bottom stirring flow of the converter to be 350-400N L/min, simultaneously adding raw and auxiliary materials, controlling the content of iron oxide in the final slag to be 26% -30%, and controlling the alkalinity of the final slag to be about 4.0;

s8, controlling the end point to be less than or equal to 0.03 percent by C and less than or equal to 0.005 percent by P, controlling the temperature to be 1580-1620 ℃, tapping after the component temperature meets the requirement, stopping slag by adopting pneumatic slag stopping and slag stopping cones in the tapping, avoiding slag falling in the tapping, slagging by adopting impurity ash, strongly deoxidizing aluminum blocks, adding silicon-manganese alloy for alloying, and stirring the bottom of a ladle at the flow rate of 30-50N L/min;

and S9, measuring the temperature and sampling after tapping, and hoisting the molten steel to L F for refining treatment.

In the smelting process for producing the ultra-low carbon phosphorus nickel series steel by using the high phosphorus molten iron, in the step S6, if the carbon content is hit and the temperature exceeds the upper limit, auxiliary materials are added and the temperature is reduced; if the carbon content is hit and the temperature is lower than the lower limit, supplying oxygen and heating, and adding carbon powder for recarburization when the carbon content is lower than the lower limit due to heating; if the temperature is hit and the carbon content exceeds the upper limit, supplying oxygen and adding auxiliary materials; if the temperature is hit and the carbon content is lower than the lower limit, adding carbon powder for recarburization; if the carbon content and the temperature both exceed the upper limit, adding auxiliary materials and supplying oxygen; if the carbon content exceeds the upper limit and the temperature is lower than the lower limit, oxygen is supplied for heating up, and carbon powder is added for recarburization when the carbon content is lower than the lower limit due to heating up; if the carbon content is lower than the lower limit and the temperature exceeds the upper limit, adding carbon powder for recarburization and then adding auxiliary materials; if the carbon content and the temperature are lower than the lower limits, adding carbon powder for recarburization and then supplying oxygen for heating.

The smelting process for producing the ultra-low carbon phosphorus-nickel series steel by using the high-phosphorus molten iron comprises the following steps: 0.136 percent, and the smelting finished product comprises the following chemical components in percentage by mass: c: 0.042%, Si: 0.3%, Mn: 0.68%, Ni: 8.92%, Alt: 0.035%, S is less than or equal to 0.001%, P is less than or equal to 0.003%, N is less than or equal to 0.0035%, and the balance is Fe and irremovable impurities;

the method specifically comprises the following steps:

s1, the charging amount of molten iron is 153 tons, molten iron pretreatment is carried out after ladle transfer, desulfurization operation is carried out, slag skimming is ensured to be clean after desulfurization, and the molten iron S in the furnace is as follows: 0.0020 percent;

s2, feeding the nickel plate into the furnace together with the scrap steel, wherein the loading amount is 22 tons, and the adding amount of the nickel plate is 14 tons;

s3, performing slag pouring operation after slag splashing of the converter, wherein slag pouring and slag remaining are performed, the slag remaining amount is 3 tons, adding scrap steel which is regular in shape and free of impurities and oxidation on the surface after slag pouring, adding the scrap steel, shaking the converter back and forth, adding molten iron, and adding the scrap steel to ensure that the product components still meet the requirements;

s4, adjusting the gun position, adding raw and auxiliary materials in time, ensuring the whole melting process of the slag, and controlling the bottom stirring flow at 200N L/min in the early stage of smelting;

s5, calculating the blowing oxygen supply amount according to the molten iron loading amount and the molten iron components, and sampling the sub-lance temperature measurement when the blowing oxygen supply amount reaches 86%, wherein the carbon hit range is 0.33%, and the temperature hit range is 1612 ℃;

s6, after the measurement of the sublance is finished, lifting the sublance when the carbon content is calculated to be 0.26% and the temperature is 1602 ℃, and then carrying out deslagging treatment, wherein the residue amount is 10 tons after deslagging;

s7, discharging slag, blowing with a gun, controlling the bottom stirring flow of the converter to be 380N L/min, and simultaneously adding raw and auxiliary materials, controlling the content of iron oxide in the final slag to be 26-30% and the alkalinity of the final slag to be about 4.0;

s8, controlling the end point to be 0.03 percent of C, controlling the temperature to be 0.003 percent of P, controlling the temperature to be 1590 ℃, tapping after the component temperature meets the requirements, stopping slag by adopting pneumatic slag blocking and a slag blocking cone to avoid slag falling during tapping, slagging by adopting impurity ash, carrying out strong deoxidation on an aluminum block, adding a silicon-manganese alloy for alloying, and stirring the bottom of a ladle at the flow rate of 30N L/min;

and S9, measuring the temperature and sampling after tapping, and hoisting the molten steel to L F for refining treatment.

The smelting process for producing the ultra-low carbon phosphorus-nickel series steel by using the high-phosphorus molten iron comprises the following steps: 0.142 percent, and the smelting finished product comprises the following chemical components in percentage by mass: c: 0.039%, Si: 0.16%, Mn: 0.72%, Ni: 9.01%, Alt: 0.029%, S is less than or equal to 0.001%, P is less than or equal to 0.004%, N is less than or equal to 0.0039%, and the balance of Fe and irremovable impurities;

the method specifically comprises the following steps:

s1, the charging amount of molten iron is 149 tons, molten iron pretreatment is carried out after ladle pouring, desulfurization operation is carried out, slag skimming is ensured to be clean after desulfurization, and the molten iron S in the furnace is: 0.0020 percent;

s2, feeding the nickel plate into the furnace together with the scrap steel, wherein the loading amount is 19 tons, and the adding amount of the nickel plate is 14 tons;

s3, performing slag pouring operation after slag splashing of the converter, pouring slag and reserving slag, wherein the slag quantity is 2 tons, adding scrap steel which is regular in shape and free of impurities and oxidation on the surface after slag pouring, adding the scrap steel, shaking the converter back and forth, adding molten iron, and adding the scrap steel to ensure that the product components still meet the requirements;

s4, adjusting the gun position, adding raw and auxiliary materials in time, ensuring the whole melting process of the slag, and controlling the bottom stirring flow at 180N L/min in the early stage of smelting;

s5, calculating the blowing oxygen supply amount according to the molten iron loading amount and the molten iron components, and sampling the sub-lance temperature measurement when the blowing oxygen supply amount reaches 86%, wherein the carbon hit range is 0.23%, and the temperature hit range is 1586 ℃;

s6, lifting the lance when the carbon content is calculated to be 0.20% and the temperature is 1590 ℃ after the measurement of the sublance is finished, and then carrying out deslagging treatment, wherein the residue amount is 10 tons after deslagging;

s7, discharging slag, blowing with a gun, controlling the bottom stirring flow of the converter to be 400N L/min, and simultaneously adding raw and auxiliary materials, controlling the content of iron oxide in the final slag to be 26-30% and the alkalinity of the final slag to be about 4.0;

s8, controlling the end point to be 0.03 percent of C and 0.004 percent of P, controlling the temperature to be 1612 ℃, tapping after the component temperature meets the requirements, stopping slag by adopting pneumatic slag blocking and slag blocking cones in the tapping, avoiding slag falling in the tapping, slagging by adopting impurity ash, carrying out strong deoxidation on an aluminum block, adding a silicon-manganese alloy for alloying, and stirring the bottom of a ladle at the flow rate of 50N L/min;

and S9, measuring the temperature and sampling after tapping, and hoisting the molten steel to L F for refining treatment.

The invention has the beneficial effects that:

(1) according to the invention, the slag retention operation ensures the rapid dephosphorization in the early stage of the converter, and the gun lifting is adopted for deslagging in the middle and later stages of smelting, so that the phosphorus content in the slag is the most, and the phosphorus content in the smelting slag is effectively reduced in the deslagging process;

(2) the determination of the temperature system in the invention ensures the complete melting of the scrap steel in the molten pool during the deslagging in the converter smelting process, avoids the instability of the temperature after secondary oxygen supply, ensures the stability of the end point carbon and phosphorus components by the smelting end point temperature system, and facilitates the combination of decarburization and dephosphorization techniques from thermodynamic analysis of the end point temperature control;

(3) the application of the converter bottom stirring technology ensures the stability of decarburization and dephosphorization in the middle period in the early period, the blowing is stable, the abnormal reactions such as splashing and the like are avoided, the large-flow bottom stirring is carried out at the smelting end point, the smooth proceeding of the chemical reaction of a molten pool is ensured, and the realization of the ultra-low carbon and phosphorus content is ensured;

(4) the reasonable amount of the slag is the most reasonable combination point of the decarburization and dephosphorization technology, and the converter is ensured to have better decarburization capability and dephosphorization capability;

(5) through the optimization of the smelting process technology, the smelting period of the nickel-based steel is shortened to 40-45 min from 50-60 min before, and the requirement of batch industrial production is met.

Detailed Description

Example 1

The smelting process for producing the ultra-low carbon phosphorus-nickel steel by using the high phosphorus molten iron provided by the embodiment comprises the following steps of: 0.136 percent, and the smelting finished product comprises the following chemical components in percentage by mass: c: 0.042%, Si: 0.3%, Mn: 0.68%, Ni: 8.92%, Alt: 0.035%, S is less than or equal to 0.001%, P is less than or equal to 0.003%, N is less than or equal to 0.0035%, and the balance is Fe and irremovable impurities.

The method specifically comprises the following steps:

s1, the charging amount of molten iron is 153 tons, molten iron pretreatment is carried out after ladle transfer, desulfurization operation is carried out, slag skimming is ensured to be clean after desulfurization, and the molten iron S in the furnace is as follows: 0.0020 percent;

s2, feeding the nickel plate into the furnace together with the scrap steel, wherein the loading amount is 22 tons, and the adding amount of the nickel plate is 14 tons;

s3, performing slag pouring operation after slag splashing of the converter, wherein slag pouring and slag remaining are performed, the slag remaining amount is 3 tons, adding scrap steel which is regular in shape and free of impurities and oxidation on the surface after slag pouring, adding the scrap steel, shaking the converter back and forth, adding molten iron, and adding the scrap steel to ensure that the product components still meet the requirements;

s4, adjusting the gun position, adding raw and auxiliary materials in time, ensuring the whole melting process of the slag, and controlling the bottom stirring flow at 200N L/min in the early stage of smelting;

s5, calculating the blowing oxygen supply amount according to the molten iron loading amount and the molten iron components, and sampling the sub-lance temperature measurement when the blowing oxygen supply amount reaches 86%, wherein the carbon hit range is 0.33%, and the temperature hit range is 1612 ℃;

s6, after the measurement of the sublance is finished, lifting the sublance when the carbon content is calculated to be 0.26% and the temperature is 1602 ℃, and then carrying out deslagging treatment, wherein the residue amount is 10 tons after deslagging;

s7, discharging slag, blowing with a gun, controlling the bottom stirring flow of the converter to be 380N L/min, and simultaneously adding raw and auxiliary materials, controlling the content of iron oxide in the final slag to be 26-30% and the alkalinity of the final slag to be about 4.0;

s8, controlling the end point to be 0.03 percent of C, controlling the temperature to be 0.003 percent of P, controlling the temperature to be 1590 ℃, tapping after the component temperature meets the requirements, stopping slag by adopting pneumatic slag blocking and a slag blocking cone to avoid slag falling during tapping, slagging by adopting impurity ash, carrying out strong deoxidation on an aluminum block, adding a silicon-manganese alloy for alloying, and stirring the bottom of a ladle at the flow rate of 30N L/min;

and S9, measuring the temperature and sampling after tapping, and hoisting the molten steel to L F for refining treatment.

Example 2

The smelting process for producing the ultra-low carbon phosphorus-nickel steel by using the high phosphorus molten iron provided by the embodiment comprises the following steps of: 0.142 percent, and the smelting finished product comprises the following chemical components in percentage by mass: c: 0.039%, Si: 0.16%, Mn: 0.72%, Ni: 9.01%, Alt: 0.029%, S is less than or equal to 0.001%, P is less than or equal to 0.004%, N is less than or equal to 0.0039%, and the balance of Fe and irremovable impurities.

The method specifically comprises the following steps:

s1, the charging amount of molten iron is 149 tons, molten iron pretreatment is carried out after ladle pouring, desulfurization operation is carried out, slag skimming is ensured to be clean after desulfurization, and the molten iron S in the furnace is: 0.0020 percent;

s2, feeding the nickel plate into the furnace together with the scrap steel, wherein the loading amount is 19 tons, and the adding amount of the nickel plate is 14 tons;

s3, performing slag pouring operation after slag splashing of the converter, pouring slag and reserving slag, wherein the slag quantity is 2 tons, adding scrap steel which is regular in shape and free of impurities and oxidation on the surface after slag pouring, adding the scrap steel, shaking the converter back and forth, adding molten iron, and adding the scrap steel to ensure that the product components still meet the requirements;

s4, adjusting the gun position, adding raw and auxiliary materials in time, ensuring the whole melting process of the slag, and controlling the bottom stirring flow at 180N L/min in the early stage of smelting;

s5, calculating the blowing oxygen supply amount according to the molten iron loading amount and the molten iron components, and sampling the sub-lance temperature measurement when the blowing oxygen supply amount reaches 86%, wherein the carbon hit range is 0.23%, and the temperature hit range is 1586 ℃;

s6, lifting the lance when the carbon content is calculated to be 0.20% and the temperature is 1590 ℃ after the measurement of the sublance is finished, and then carrying out deslagging treatment, wherein the residue amount is 10 tons after deslagging;

s7, discharging slag, blowing with a gun, controlling the bottom stirring flow of the converter to be 400N L/min, and simultaneously adding raw and auxiliary materials, controlling the content of iron oxide in the final slag to be 26-30% and the alkalinity of the final slag to be about 4.0;

s8, controlling the end point to be 0.03 percent of C and 0.004 percent of P, controlling the temperature to be 1612 ℃, tapping after the component temperature meets the requirements, stopping slag by adopting pneumatic slag blocking and slag blocking cones in the tapping, avoiding slag falling in the tapping, slagging by adopting impurity ash, carrying out strong deoxidation on an aluminum block, adding a silicon-manganese alloy for alloying, and stirring the bottom of a ladle at the flow rate of 50N L/min;

and S9, measuring the temperature and sampling after tapping, and hoisting the molten steel to L F for refining treatment.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (8)

1. A smelting process for producing ultra-low carbon phosphorus nickel series steel by using high phosphorus molten iron is characterized by comprising the following steps:

the smelting finished product comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, Si: 0.1-0.3%, Mn: 0.5% -0.8%, Ni: 8.8% -9.2%, Alt: 0.015-0.050%, S is less than or equal to 0.002%, P is less than or equal to 0.005%, N is less than or equal to 0.005%, and the balance of Fe and irremovable impurities;

the converter smelting is adopted, the phosphorus content of the used molten iron is 0.130-0.150%, the method of early-stage slag retention and later-stage slag retention is adopted, the smelting end point temperature is 1580-1620 ℃, the bottom stirring flow rate in the middle and later stages of smelting is 350-400N L/min, the final slag alkalinity is 4.0, the final slag control amount is 10-12 tons, and the decarburization rate of the converter is not less than 99%, and the dephosphorization rate is not less than 96%.

2. The smelting process for producing the ultra-low carbon phosphorus-nickel series steel by using the high phosphorus molten iron as claimed in claim 1, wherein the smelting process comprises the following steps: the smelting finished product comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, Si: 0.1-0.2%, Mn: 0.5% -0.6%, Ni: 9.0% -9.2%, Alt: 0.015-0.040%, S is less than or equal to 0.002%, P is less than or equal to 0.005%, N is less than or equal to 0.005%, and the balance is Fe and irremovable impurities.

3. The smelting process for producing the ultra-low carbon phosphorus-nickel series steel by using the high phosphorus molten iron as claimed in claim 1, wherein the smelting process comprises the following steps: the smelting finished product comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, Si: 0.2-0.3%, Mn: 0.6-0.7%, Ni: 8.9% -9.1%, Alt: 0.020-0.050%, S is less than or equal to 0.002%, P is less than or equal to 0.005%, N is less than or equal to 0.005%, and the balance of Fe and irremovable impurities.

4. The smelting process for producing the ultra-low carbon phosphorus-nickel series steel by using the high phosphorus molten iron as claimed in claim 1, wherein the smelting process comprises the following steps: the smelting finished product comprises the following chemical components in percentage by mass: c is less than or equal to 0.05 percent, Si: 0.15-0.25%, Mn: 0.7% -0.8%, Ni: 8.8% -9.0%, Alt: 0.015-0.040%, S is less than or equal to 0.002%, P is less than or equal to 0.005%, N is less than or equal to 0.005%, and the balance is Fe and irremovable impurities.

5. The smelting process for producing the ultra-low carbon phosphorus-nickel series steel by using the high phosphorus molten iron as claimed in claim 1, wherein the smelting process comprises the following steps: the method specifically comprises the following steps:

s1, the charging amount of molten iron is 150 +/-5 tons, molten iron pretreatment is carried out after the molten iron is poured out of a tank, desulfurization operation is carried out, slag skimming is ensured to be clean after the desulfurization, and S of molten iron entering the furnace is less than or equal to 0.0020 percent;

s2, feeding the nickel plate into the furnace together with the scrap steel, wherein the loading amount is 20 +/-5 tons, and the adding amount of the nickel plate is 14 tons;

s3, performing slag pouring operation after slag splashing of the converter, pouring slag and reserving slag, wherein the slag quantity is 2-3 tons, adding waste steel which is regular in shape and free of impurities and oxidation on the surface after slag pouring is finished, adding the waste steel, shaking the converter back and forth, adding molten iron, and adding the waste steel to ensure that the product components still meet the requirements;

s4, adjusting the lance position, adding raw and auxiliary materials in time, ensuring the whole melting process of the slag, and controlling the bottom stirring flow at 180-200N L/min in the early stage of smelting;

s5, calculating the blowing oxygen supply amount according to the molten iron loading amount and the molten iron components, and sampling at the sublance temperature measurement temperature when the blowing oxygen supply amount reaches 83-88%, wherein the carbon hit range is 0.20-0.40%, and the temperature hit range is 1580-1620 ℃;

s6, after the sublance measurement is finished, lifting the sublance when the carbon content is calculated to be 0.20% -0.30% and the temperature is 1580-1620 ℃, and performing deslagging treatment after lifting the sublance, wherein the residue amount is 10 tons after deslagging;

s7, discharging slag, blowing with a gun, controlling the bottom stirring flow of the converter to be 350-400N L/min, simultaneously adding raw and auxiliary materials, controlling the content of iron oxide in the final slag to be 26% -30%, and controlling the alkalinity of the final slag to be about 4.0;

s8, controlling the end point to be less than or equal to 0.03 percent by C and less than or equal to 0.005 percent by P, controlling the temperature to be 1580-1620 ℃, tapping after the component temperature meets the requirement, stopping slag by adopting pneumatic slag stopping and slag stopping cones in the tapping, avoiding slag falling in the tapping, slagging by adopting impurity ash, strongly deoxidizing aluminum blocks, adding silicon-manganese alloy for alloying, and stirring the bottom of a ladle at the flow rate of 30-50N L/min;

and S9, measuring the temperature and sampling after tapping, and hoisting the molten steel to L F for refining treatment.

6. The smelting process for producing the ultra-low carbon phosphorus-nickel series steel by using the high phosphorus molten iron as claimed in claim 1, wherein the smelting process comprises the following steps: in the step S6, if the carbon content is hit and the temperature exceeds the upper limit, adding auxiliary materials and cooling; if the carbon content is hit and the temperature is lower than the lower limit, supplying oxygen and heating, and adding carbon powder for recarburization when the carbon content is lower than the lower limit due to heating; if the temperature is hit and the carbon content exceeds the upper limit, supplying oxygen and adding auxiliary materials; if the temperature is hit and the carbon content is lower than the lower limit, adding carbon powder for recarburization; if the carbon content and the temperature both exceed the upper limit, adding auxiliary materials and supplying oxygen; if the carbon content exceeds the upper limit and the temperature is lower than the lower limit, oxygen is supplied for heating up, and carbon powder is added for recarburization when the carbon content is lower than the lower limit due to heating up; if the carbon content is lower than the lower limit and the temperature exceeds the upper limit, adding carbon powder for recarburization and then adding auxiliary materials; if the carbon content and the temperature are lower than the lower limits, adding carbon powder for recarburization and then supplying oxygen for heating.

7. The method for producing nickel-based steel with high phosphorus molten iron according to claim 1, wherein: p in molten iron: 0.136 percent, and the smelting finished product comprises the following chemical components in percentage by mass: c: 0.042%, Si: 0.3%, Mn: 0.68%, Ni: 8.92%, Alt: 0.035%, S is less than or equal to 0.001%, P is less than or equal to 0.003%, N is less than or equal to 0.0035%, and the balance is Fe and irremovable impurities;

the method specifically comprises the following steps:

s1, the charging amount of molten iron is 153 tons, molten iron pretreatment is carried out after ladle transfer, desulfurization operation is carried out, slag skimming is ensured to be clean after desulfurization, and the molten iron S in the furnace is as follows: 0.0020 percent;

s2, feeding the nickel plate into the furnace together with the scrap steel, wherein the loading amount is 22 tons, and the adding amount of the nickel plate is 14 tons;

s3, performing slag pouring operation after slag splashing of the converter, wherein slag pouring and slag remaining are performed, the slag remaining amount is 3 tons, adding scrap steel which is regular in shape and free of impurities and oxidation on the surface after slag pouring, adding the scrap steel, shaking the converter back and forth, adding molten iron, and adding the scrap steel to ensure that the product components still meet the requirements;

s4, adjusting the gun position, adding raw and auxiliary materials in time, ensuring the whole melting process of the slag, and controlling the bottom stirring flow at 200N L/min in the early stage of smelting;

s5, calculating the blowing oxygen supply amount according to the molten iron loading amount and the molten iron components, and sampling the sub-lance temperature measurement when the blowing oxygen supply amount reaches 86%, wherein the carbon hit range is 0.33%, and the temperature hit range is 1612 ℃;

s6, after the measurement of the sublance is finished, lifting the sublance when the carbon content is calculated to be 0.26% and the temperature is 1602 ℃, and then carrying out deslagging treatment, wherein the residue amount is 10 tons after deslagging;

s7, discharging slag, blowing with a gun, controlling the bottom stirring flow of the converter to be 380N L/min, and simultaneously adding raw and auxiliary materials, controlling the content of iron oxide in the final slag to be 26-30% and the alkalinity of the final slag to be about 4.0;

s8, controlling the end point to be 0.03 percent of C, controlling the temperature to be 0.003 percent of P, controlling the temperature to be 1590 ℃, tapping after the component temperature meets the requirements, stopping slag by adopting pneumatic slag blocking and a slag blocking cone to avoid slag falling during tapping, slagging by adopting impurity ash, carrying out strong deoxidation on an aluminum block, adding a silicon-manganese alloy for alloying, and stirring the bottom of a ladle at the flow rate of 30N L/min;

and S9, measuring the temperature and sampling after tapping, and hoisting the molten steel to L F for refining treatment.

8. The method for producing nickel-based steel with high phosphorus molten iron according to claim 1, wherein: p in molten iron: 0.142 percent, and the smelting finished product comprises the following chemical components in percentage by mass: c: 0.039%, Si: 0.16%, Mn: 0.72%, Ni: 9.01%, Alt: 0.029%, S is less than or equal to 0.001%, P is less than or equal to 0.004%, N is less than or equal to 0.0039%, and the balance of Fe and irremovable impurities;

the method specifically comprises the following steps:

s1, the charging amount of molten iron is 149 tons, molten iron pretreatment is carried out after ladle pouring, desulfurization operation is carried out, slag skimming is ensured to be clean after desulfurization, and the molten iron S in the furnace is: 0.0020 percent;

s2, feeding the nickel plate into the furnace together with the scrap steel, wherein the loading amount is 19 tons, and the adding amount of the nickel plate is 14 tons;

s3, performing slag pouring operation after slag splashing of the converter, pouring slag and reserving slag, wherein the slag quantity is 2 tons, adding scrap steel which is regular in shape and free of impurities and oxidation on the surface after slag pouring, adding the scrap steel, shaking the converter back and forth, adding molten iron, and adding the scrap steel to ensure that the product components still meet the requirements;

s4, adjusting the gun position, adding raw and auxiliary materials in time, ensuring the whole melting process of the slag, and controlling the bottom stirring flow at 180N L/min in the early stage of smelting;

s5, calculating the blowing oxygen supply amount according to the molten iron loading amount and the molten iron components, and sampling the sub-lance temperature measurement when the blowing oxygen supply amount reaches 86%, wherein the carbon hit range is 0.23%, and the temperature hit range is 1586 ℃;

s6, lifting the lance when the carbon content is calculated to be 0.20% and the temperature is 1590 ℃ after the measurement of the sublance is finished, and then carrying out deslagging treatment, wherein the residue amount is 10 tons after deslagging;

s7, discharging slag, blowing with a gun, controlling the bottom stirring flow of the converter to be 400N L/min, and simultaneously adding raw and auxiliary materials, controlling the content of iron oxide in the final slag to be 26-30% and the alkalinity of the final slag to be about 4.0;

s8, controlling the end point to be 0.03 percent of C and 0.004 percent of P, controlling the temperature to be 1612 ℃, tapping after the component temperature meets the requirements, stopping slag by adopting pneumatic slag blocking and slag blocking cones in the tapping, avoiding slag falling in the tapping, slagging by adopting impurity ash, carrying out strong deoxidation on an aluminum block, adding a silicon-manganese alloy for alloying, and stirring the bottom of a ladle at the flow rate of 50N L/min;

and S9, measuring the temperature and sampling after tapping, and hoisting the molten steel to L F for refining treatment.