CN113046628B - N800CF steel for pumped storage pressure steel pipe and smelting method - Google Patents
N800CF steel for pumped storage pressure steel pipe and smelting method Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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- C21C1/02—Dephosphorising or desulfurising
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- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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- C—CHEMISTRY; METALLURGY
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- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C22C33/06—Making ferrous alloys by melting using master alloys
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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Abstract
The invention discloses N800CF steel for a pumped storage pressure steel pipe and a smelting method, which relate to the technical field of steel production and comprise the following chemical components in percentage by mass: c: 0.070% -0.10%, Si: 0.10-0.30%, Mn: 1.20-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.0050%, Ti: 0.006-0.020%, Cr: 0.20-0.30%, Ni: 0.40% -0.50%, Mo: 0.10-0.30%, Cu is less than or equal to 0.05%, Al: 0.005-0.015%, Mg: 0.0008 to 0.0015 percent, less than or equal to 0.0050 percent of N, and the balance of Fe and inevitable impurities. Stirring desulphurization, converter smelting, LF + RH refining treatment, microalloying technology in the refining process to reduce the inclusion size, and nanometer micro-particles are included to form austenite nuclear particles, thereby improving the strength and toughness performance of the steel plate and the welding requirement.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to N800CF steel for a pumped storage pressure steel pipe and a smelting method.
Background
With the transformation development of the macro economy, the clean energy source is more and more important for the sustainable development of the country. The hydroelectric power generation as a clean energy source has the characteristics of reproducibility, no pollution, low operation cost, convenience in power peak regulation and the like, and is beneficial to improving the resource utilization rate. Therefore, under the condition that the traditional energy is increasingly tense, all countries in the world generally preferentially utilize water resources and vigorously develop water and electricity. In 2010, the hydropower station built in China breaks through 2 hundred million kilowatts, and reaches 3.3 hundred million kilowatts in 2020. With the pace of water and electricity construction in China accelerating, and particularly with the construction of large-capacity pumped storage power stations, high-head, large-diameter and high-HD-value pressure steel pipes are continuously emerging. The demand of projects such as thirteen-tomb pumped storage, small wave bottom, natural terrace pumped storage, two beaches, Shandong leathers and the like on the steel for hydropower develops from 600MPa level to 800MPa level, and more 800MPa level steel for hydropower is adopted in hydropower projects which are being built at home and abroad and in future. The 800MPa grade hydroelectric steel is not brought into the national standard at present, and the steel executed by each enterprise is also the enterprise standard. However, the quality of domestic products is closer to that of foreign products in strength level, but there is a certain gap in plasticity index and low-temperature impact property.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides N800CF steel for a pumped storage pressure steel pipe, which comprises the following chemical components in percentage by mass: c: 0.070% -0.10%, Si: 0.10-0.30%, Mn: 1.20-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.0050%, Ti: 0.006-0.020%, Cr: 0.20-0.30%, Ni: 0.40% -0.50%, Mo: 0.10-0.30%, Cu is less than or equal to 0.05%, Al: 0.005-0.015%, Mg: 0.0008 to 0.0015 percent, less than or equal to 0.0050 percent of N, and the balance of Fe and inevitable impurities.
The technical scheme of the invention is further defined as follows:
the steel for the pumped storage penstock mentioned above is N800CF steel, C: 0.070% -0.09%, Si: 0.10-0.20%, Mn: 1.20 to 1.40 percent of the total weight of the alloy, less than or equal to 0.013 percent of P, less than or equal to 0.0030 percent of S, Ti: 0.006-0.018%, Cr: 0.20-0.25%, Ni: 0.40% -0.45%, Mo: 0.10-0.20%, Cu is less than or equal to 0.05%, Al: 0.005-0.015%, Mg: 0.0008 to 0.0013 percent, less than or equal to 0.0050 percent of N, and the balance of Fe and inevitable impurities.
The steel for the pumped storage penstock mentioned above is N800CF steel, C: 0.075-0.095%, Si: 0.15-0.25%, Mn: 1.30-1.40%, P is less than or equal to 0.015%, S is less than or equal to 0.0020%, Ti: 0.008-0.020%, Cr: 0.21% -0.29%, Ni: 0.41-0.49%, Mo: 0.11-0.29%, Cu is less than or equal to 0.05%, Al: 0.006-0.015%, Mg: 0.0009 to 0.0015 percent, less than or equal to 0.0050 percent of N, and the balance of Fe and inevitable impurities.
The steel for the pumped storage penstock mentioned above is N800CF steel, C: 0.080-0.10%, Si: 0.20-0.30%, Mn: 140 to 1.50 percent, P is less than or equal to 0.012 percent, S is less than or equal to 0.0020 percent, Ti: 0.012% -0.020%, Cr: 0.25-0.30%, Ni: 0.45% -0.50%, Mo: 0.20-0.30%, Cu is less than or equal to 0.05%, Al: 0.006% -0.015%, Mg: 0.0009 to 0.0014 percent of Fe, less than or equal to 0.0050 percent of N, and the balance of Fe and inevitable impurities.
The invention also aims to provide a smelting method of the N800CF steel for the pumped storage pressure steel pipe, which comprises the following steps:
s1, desulfurizing molten iron by using liquid lime and a stirring method, and slagging off and blowing in a converter after desulfurization;
s2, blowing in a converter, adding the nickel and molybdenum alloy into the converter along with the self-produced scrap steel, and deoxidizing the converter steel tapping in a strong deoxidation mode to ensure that the content of aluminum after the converter meets 0.030-0.050% and the content of sulfur is less than or equal to 0.010%;
s3, adjusting argon blowing at the bottom of a steel ladle after molten steel reaches an LF furnace, electrifying to raise the temperature, melting slag by using lime and aluminum wires, sampling and analyzing white slag of furnace slag, continuously adding lime and aluminum wires according to a sample for desulfurization, carrying out alloying treatment after desulfurization is finished, carrying out molten steel oxygen determination operation after alloying is finished, wherein the oxygen content is less than or equal to 5ppm, carrying out precipitation deoxidation by using magnesium-aluminum composite alloy after oxygen determination is finished, and hoisting the molten steel to RH for vacuum treatment;
s4, carrying out vacuum treatment when the molten steel reaches RH, keeping the vacuum for 8-12 min, and hoisting to continuous casting for casting after the vacuum treatment is finished;
and S5, adopting a gas-permeable water gap for continuous casting to ensure smooth casting, adopting the processes of electromagnetic stirring and dynamic soft reduction, and checking the surface quality and processing the blank after the blank is cooled in a heap for 48 hours to ensure that the blank meets the requirements.
In the aforementioned method for smelting the N800CF steel for the pumped storage penstock, in the step S3, the magnesium content of the magnesium-aluminum alloy is 20% to 30%.
The invention has the beneficial effects that:
(1) according to the invention, stirring desulphurization and converter smelting are adopted, LF + RH refining treatment is carried out, microalloying technology is adopted in the refining process to reduce the inclusion size, and nano-scale microparticles are mixed into austenite nuclear particles, so that the molten steel cleanliness problem of hydraulic and hydroelectric steel is solved, the high chemical activity of magnesium element at high vapor pressure and low melting point at the molten steel smelting temperature is utilized, fine and dispersed magnesium inclusions are produced after magnesium treatment, the grain size of the product reaches more than 11 grades, and the nano-scale microparticles are mixed into austenite nuclear particles to effectively refine the grain sizes of a steel plate and a welding area base metal steel plate, so that the welding performance of the product is improved;
(2) the invention adopts the stirring method for desulfurization and the application of self-produced scrap steel, stabilizes the sulfur content of the steel tapped by the converter, meets the desulfurization requirement of the product through the CAS furnace process, and reduces the size and the quantity of the original calcium aluminate inclusion;
(3) according to the invention, the molten steel is refined, the oxygen content in the steel is effectively controlled, the total oxygen content of the molten steel is reduced through the microalloying application of the magnesium-aluminum alloy, and the harm of large inclusions in the steel is eliminated;
(4) the invention adopts magnesium-treated molten steel, eliminates manganese sulfide long-strip-shaped inclusion in the steel, generates magnesium sulfide spheroidized inclusion, and improves the quality of the molten steel
(5) The invention adopts magnesium-treated molten steel to generate fine and dispersed nano-grade MgO-Al2O3Spinel and fine inclusions become nucleation cores of tissue transformation in the rolling process, a large amount of acicular ferrite is formed, and the toughness and the welding performance of the product are effectively improved;
(6) after the magnesium microalloying treatment is adopted, the original crystal grains of the steel plate are effectively refined, and the welding performance and the yield ratio performance after quenching and tempering of the product are effectively improved.
Detailed Description
Example 1
The N800CF steel for the pumped storage penstock provided by the embodiment comprises the following chemical components in percentage by mass: c: 0.078%, Si: 0.19%, Mn: 1.28%, P: 0.011%, S: 0.0020%, Ti: 0.019%, Cr: 0.23%, Ni: 0.43%, Mo: 0.13%, Cu: 0.01%, Al: 0.011%, Mg: 0.0010%, N: 0.0027%, Nb, V, Ca are not added, and the balance is Fe and inevitable impurities.
The manufacturing method comprises the following steps:
s1, desulfurizing molten iron by using liquid lime and a stirring method, and slagging off and blowing in a converter after desulfurization;
s2, blowing in a converter, adding the nickel and molybdenum alloy into the converter along with the self-produced scrap steel, and deoxidizing the converter steel tapping in a strong deoxidation mode, wherein the content of aluminum is 0.039% and the content of sulfur is 0.008% after the converter tapping;
s3, after the molten steel reaches an LF furnace, adjusting argon blowing at the bottom of a steel ladle, enabling the argon flow to be 375NL/min, electrifying to heat, melting slag by adopting lime and aluminum wires, sampling and analyzing white slag of the furnace slag, continuously adding lime and the aluminum wires according to a sample for desulfurization, carrying out alloying treatment after the desulfurization is finished, carrying out molten steel oxygen determination operation after the alloying is finished, wherein the oxygen content is 3ppm, carrying out precipitation deoxidation by adopting a magnesium-aluminum composite alloy after the oxygen determination is finished, and hoisting the molten steel to RH for vacuum treatment;
s4, carrying out vacuum treatment when the molten steel reaches RH, keeping the vacuum for 11min, and hoisting to be continuously cast for casting after the vacuum treatment is finished;
and S5, adopting a gas-permeable water gap for continuous casting to ensure smooth casting, adopting the processes of electromagnetic stirring and dynamic soft reduction, and checking the surface quality and processing the blank after the blank is cooled in a heap for 48 hours to ensure that the blank meets the requirements.
Example 2
The difference between the N800CF steel for the pumped storage penstock provided by the embodiment and the embodiment 1 is that the steel comprises the following chemical components in percentage by mass: c: 0.093%, Si: 0.26%, Mn: 1.43%, P: 0.013%, S: 0.0020%, Ti: 0.017%, Cr: 0.29%, Ni: 0.48%, Mo: 0.26%, Cu: 0.02%, Al: 0.013%, Mg: 0.0013%, N: 0.0036%, and the balance of Fe and inevitable impurities.
The inclusion of the steel sheets of example 1 and example 2 is shown in the following table:
in conclusion, the invention designs a unique smelting production process on the basis of product design, changes the traditional inclusion form and is a novel manufacturing method taking magnesium deoxidation as a core. After large harmful inclusions are subjected to denaturation treatment, fine dispersed inclusions with the particle size not larger than 10 microns are obtained, the fine dispersed inclusions are good nucleation points in the process of structure transformation, the detected grain size of a product can reach more than 11 grades, the toughness of the product is improved, the welding performance of the product is greatly improved, and the service performance of the steel for water and electricity is ensured.
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 (5)
1. The utility model provides a pumped storage pressure steel pipe is with N800CF steel which characterized in that: the chemical components and the mass percentage are as follows: c: 0.070% -0.10%, Si: 0.10-0.30%, Mn: 1.20-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.0050%, Ti: 0.006-0.020%, Cr: 0.20-0.30%, Ni: 0.40% -0.50%, Mo: 0.10-0.30%, Cu is less than or equal to 0.05%, Al: 0.005-0.015%, Mg: 0.0008 to 0.0015 percent, less than or equal to 0.0050 percent of N and the balance of Fe and inevitable impurities;
the smelting method comprises the following steps:
s1, desulfurizing molten iron by using liquid lime and a stirring method, and after desulfurization is finished, skimming slag and blowing in a converter;
s2, converting in a converter, adding the nickel and molybdenum alloy into the converter along with the self-produced scrap steel, and deoxidizing the steel discharged from the converter in a strong deoxidation mode to ensure that the content of aluminum after the converter meets 0.030% -0.050% and the content of sulfur is less than or equal to 0.010%;
s3, adjusting argon blowing at the bottom of a steel ladle after molten steel reaches an LF furnace, electrifying to raise the temperature, melting slag by using lime and aluminum wires, sampling and analyzing white slag of furnace slag, continuously adding lime and aluminum wires according to a sample for desulfurization, carrying out alloying treatment after desulfurization is finished, carrying out molten steel oxygen determination operation after alloying is finished, wherein the oxygen content is less than or equal to 5ppm, carrying out precipitation deoxidation by using magnesium-aluminum composite alloy after oxygen determination is finished, and hoisting the molten steel to RH for vacuum treatment;
s4, carrying out vacuum treatment when the molten steel reaches RH, keeping the vacuum for 8-12 min, and hoisting to be continuously cast after the vacuum treatment is finished;
and S5, adopting a gas-permeable water gap for continuous casting to ensure smooth casting, adopting the processes of electromagnetic stirring and dynamic soft reduction, and checking the surface quality and processing the blank after the blank is cooled in a heap for 48 hours to ensure that the blank meets the requirements.
2. The steel according to claim 1, wherein the steel is N800CF steel for pumped storage penstock, and is characterized in that: the chemical components and the mass percentage are as follows: c: 0.070% -0.09%, Si: 0.10-0.20%, Mn: 1.20 to 1.40 percent of the total weight of the alloy, less than or equal to 0.013 percent of P, less than or equal to 0.0030 percent of S, Ti: 0.006-0.018%, Cr: 0.20-0.25%, Ni: 0.40-0.45%, Mo: 0.10-0.20%, Cu is less than or equal to 0.05%, Al: 0.005-0.015%, Mg: 0.0008 to 0.0013 percent, less than or equal to 0.0050 percent of N, and the balance of Fe and inevitable impurities.
3. The steel according to claim 1, wherein the steel is N800CF steel for pumped storage penstock, and is characterized in that: the chemical components and the mass percentage are as follows: c: 0.075-0.095%, Si: 0.15-0.25%, Mn: 1.30-1.40%, P is less than or equal to 0.015%, S is less than or equal to 0.0020%, Ti: 0.008-0.020%, Cr: 0.21% -0.29%, Ni: 0.41-0.49%, Mo: 0.11-0.29%, Cu is less than or equal to 0.05%, Al: 0.006-0.015%, Mg: 0.0009 to 0.0015 percent, less than or equal to 0.0050 percent of N, and the balance of Fe and inevitable impurities.
4. The steel according to claim 1, wherein the steel is N800CF steel for pumped storage penstock, and is characterized in that: the chemical components and mass percentage are as follows: c: 0.080-0.10%, Si: 0.20-0.30%, Mn: 140 to 1.50 percent, P is less than or equal to 0.012 percent, S is less than or equal to 0.0020 percent, Ti: 0.012% -0.020%, Cr: 0.25% -0.30%, Ni: 0.45% -0.50%, Mo: 0.20-0.30%, Cu is less than or equal to 0.05%, Al: 0.006% -0.015%, Mg: 0.0009 to 0.0014 percent, less than or equal to 0.0050 percent of N, and the balance of Fe and inevitable impurities.
5. The steel according to claim 1, wherein the steel is N800CF steel for pumped storage penstock, and is characterized in that: in the step S3, the magnesium content of the magnesium-aluminum composite alloy is 20-30%.
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| CN114525379A (en) * | 2022-02-15 | 2022-05-24 | 南京钢铁股份有限公司 | High-wear-resistance steel for coal mining and production method thereof |
| CN114672735A (en) * | 2022-04-12 | 2022-06-28 | 南京钢铁股份有限公司 | Wear-resistant steel with grade of 500HB or above and production method thereof |
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