CN115466903A - High-strength special steel and production process thereof - Google Patents
High-strength special steel and production process thereof Download PDFInfo
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- CN115466903A CN115466903A CN202210821408.XA CN202210821408A CN115466903A CN 115466903 A CN115466903 A CN 115466903A CN 202210821408 A CN202210821408 A CN 202210821408A CN 115466903 A CN115466903 A CN 115466903A
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0068—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by introducing material into a current of streaming metal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
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- 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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- 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
- 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
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- 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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- 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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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Abstract
The invention provides a high-strength special steel and a production process thereof, and the production process is used for producing the high-strength special steel and comprises the following steps: s1, converter bottom blowing smelting, namely performing slag splashing treatment on the slag of the previous converter, leaving the final slag in the converter, adding the raw materials into the converter for smelting, performing converter bottom blowing by arranging an oxygen lance in the converter body during smelting, starting to add lime and light-burned dolomite after oxygen blowing, pouring the smelted molten iron into the converter for tapping, adding sufficient silicomanganese alloy during pouring tapping, and performing slag washing by using synthetic slag; s2, continuously casting and rolling steel, wherein during hot continuous rolling, the continuously cast plate blank is reheated to 1230-1250 ℃ for not less than 110min; the final rolling temperature range of the hot continuous rolling is 880-920 ℃; after hot continuous rolling, the steel is rapidly cooled to 670-700 ℃ and 630-660 ℃ respectively by adopting a front section cooling mode for carrying out grading control.
Description
Technical Field
The invention relates to the field of special steel, in particular to high-strength special steel and a production process thereof.
Background
The special steel, also called alloy steel, is made up by adding one or several alloy elements in carbon steel in a proper quantity to change the structure of steel so as to make the steel possess various special properties.
In the process of smelting specific steel grades in a converter, the single slag method is a converter smelting method for low-phosphorus steel with the shortest overall period and the lowest equipment requirement in all smelting modes. However, due to conventional understanding that the conventional concept has poor dephosphorization capability and low dephosphorization efficiency, the conventional concept is not generally considered as a method for smelting the low-phosphorus special steel, and even if single slag is tried to be adopted for smelting the low-phosphorus special steel, the problems of obvious increase of slag consumption, obvious improvement of end-point blowing rate, poor smelting stability and the like often occur.
With the continuous development of productivity, the use requirement of the industrial special steel alloy is continuously improved, and the existing special steel alloy can not meet the use requirement of the market gradually.
Disclosure of Invention
Therefore, aiming at the problems, the invention provides high-strength special steel and a production process thereof.
In order to realize the technical problem, the invention adopts the solution that the high-strength special steel comprises the following components in percentage by weight:
carbon: 0.05 to 0.07%, silicon: 0.1 to 0.2%, manganese: 1.58 to 2.25%, phosphorus: 0.003 to 0.005%, chromium: 0.45 to 0.55%, nickel: 5.5 to 9.5%, copper: 0.4 to 0.5%, titanium: 2.0 to 4.0 percent; 1.3 to 2.7 percent of tungsten, and the balance of Fe and uncontrollable impurity elements.
As a further improvement of the invention: comprises the following components in percentage by weight:
carbon: 0.06%, silicon: 0.15%, manganese: 2.13%, phosphorus: 0.004%, chromium: 0.50%, nickel: 6.3%, copper: 0.45%, titanium: 3.0 percent; 2.1% of tungsten, and the balance of Fe and uncontrollable impurity elements.
The invention also provides a production process of the high-strength special steel, which is used for producing the high-strength special steel and comprises the following steps:
s1, converter bottom blowing smelting
After slag splashing treatment is carried out on the slag of the previous furnace, the final slag is completely left in the converter, then the raw materials are added into the furnace for smelting, during smelting, an oxygen lance is arranged in the furnace body for bottom blowing of the converter, lime and light burned dolomite are added after oxygen blowing, the smelted molten iron is poured out of the furnace for tapping, sufficient silicomanganese alloy is added in the pouring-out tapping process, and synthetic slag is used for slag washing;
s2 continuous casting and rolling
When in hot continuous rolling, the continuously cast plate blank is reheated to 1230-1250 ℃ and the furnace time is not less than 110min; the final rolling temperature range of the hot continuous rolling is 880-920 ℃; after hot continuous rolling, respectively and rapidly cooling to 670-700 ℃ coiling and 630-660 ℃ coiling in a front section cooling mode for hierarchical control;
in the pickling and cold rolling process, the cold rolling reduction rate is controlled to be 58-80 percent;
s3 Heat treatment
And annealing and tempering the steel to obtain the special steel.
As a further improvement of the invention: in the step S1, the converter bottom blowing is performed by arranging an oxygen lance in the furnace body, and the method further comprises the following steps:
and in the blowing stage, lowering the lance position of the oxygen lance to 1100-1300 mm, and firing the oxygen lance for 80s-110s.
As a further improvement of the invention: the process of adding lime and light-burned dolomite after oxygen blowing also comprises the following steps:
the adding mass of the lime is 30-40% of the converter tapping amount, and the adding mass of the soft-burned dolomite is 11-15% of the converter tapping amount.
As a further improvement of the invention: the process of annealing and tempering the steel material further comprises:
the steel is sequentially subjected to isothermal annealing, general annealing, preheating and quenching, and is immediately subjected to secondary tempering after quenching.
As a further improvement of the invention: before annealing, the steel is heated to 900-960 ℃ and kept warm for 1-2 hours.
As a further improvement of the invention: the preheating comprises preheating the steel to 800-850 ℃ and keeping for 0.5-1 hour.
As a further improvement of the invention: the isothermal annealing is carried out for 2 hours when the temperature is cooled to 680-710 ℃.
As a further improvement of the invention: the secondary tempering comprises: the first tempering is carried out at 510-540 ℃ and the temperature is kept for 1 hour; and the second tempering is carried out at 550-560 ℃ for 1 hour.
By adopting the technical scheme, the invention has the beneficial effects that:
the invention relates to a production process of high-strength special steel, which is characterized in that the final slag obtained from the slag of a previous furnace is completely left in a converter, then raw materials are added for smelting, bottom blowing is carried out from the bottom of the converter, lime and light burned dolomite are added after the bottom blowing, further the dephosphorization load of the raw materials is effectively reduced, the carbon content and the phosphorus content of molten iron generated by reversing the converter can be effectively reduced, silicon-manganese alloy is added during reversing tapping, synthetic slag is used for slag washing, further the purity of the molten iron is ensured, and the special steel prepared has the advantages of large strength, small residual stress and strong toughness through the control of hot rolling, cold rolling and heat treatment.
Detailed Description
The invention will now be further illustrated with reference to specific examples.
Example one
The embodiment of the invention discloses a production process of high-strength special steel, which comprises the following steps:
s1, converter bottom blowing smelting
After slag splashing treatment is carried out on the slag of the previous furnace, the final slag is completely left in the converter, then the raw materials are added into the furnace for smelting, during smelting, an oxygen lance is arranged in the furnace body for bottom blowing of the converter, lime and light burned dolomite are added after oxygen blowing, the smelted molten iron is poured out of the furnace for tapping, sufficient silicomanganese alloy is added in the pouring-out tapping process, and synthetic slag is used for slag washing;
s2 continuous casting and rolling
When in hot continuous rolling, the continuously cast plate blank is reheated to 1230 ℃, and the furnace time is not less than 110min; the temperature range of the hot continuous rolling and the finish rolling is 880 ℃; after hot continuous rolling, respectively and rapidly cooling to 670 ℃ coiling and 630 ℃ coiling in a front section cooling mode for grading control;
in the pickling and cold rolling process, the cold rolling reduction rate is controlled to be 58 percent;
s3 Heat treatment
And annealing and tempering the steel to obtain the special steel.
In this embodiment, further, in step S1, the method for performing bottom blowing of a converter by installing an oxygen lance in a furnace body further includes:
and in the blow-on stage, the position of the oxygen lance is lowered to 1100mm, and the lower lance is ignited to blow for 80s.
In this embodiment, further, the adding lime and the light-burned dolomite after the oxygen blowing further includes:
the adding mass of the lime is 30% of the converter tapping amount, and the adding mass of the light burned dolomite is 11% of the converter tapping amount.
In this embodiment, further, annealing and tempering the steel material further includes:
the steel is sequentially subjected to isothermal annealing, general annealing, preheating and quenching, and is immediately subjected to secondary tempering after quenching.
In this embodiment, further, before the annealing, the steel material is heated to 900 ℃ and kept at the temperature for 1 hour.
In this embodiment, the preheating includes preheating the steel to 800 ℃ for 0.5 hour.
In the embodiment, further, the isothermal annealing is carried out for 2 hours when the temperature is cooled to 680 ℃.
In this embodiment, further, the secondary tempering includes: the first tempering is carried out at 510 ℃ and the temperature is kept for 1 hour; and the second tempering is carried out at 550 ℃ for 1 hour.
The high-strength special steel prepared by the production process comprises the following components in percentage by weight: carbon: 0.05%, silicon: 0.1%, manganese: 1.58%, phosphorus: 0.003%, chromium: 0.45%, nickel: 5.5%, copper: 0.4%, titanium: 2.0 percent; 1.3 percent of tungsten and the balance of Fe and uncontrollable impurity elements.
Example two
The embodiment of the invention discloses a production process of high-strength special steel, which comprises the following steps:
s1, converter bottom blowing smelting
After slag splashing treatment is carried out on the slag of the previous furnace, the final slag is completely remained in the converter, then the raw materials are added into the furnace for smelting, during smelting, an oxygen lance is arranged in the furnace body for bottom blowing of the converter, lime and light burned dolomite are added after oxygen blowing, the smelted molten iron is poured out of the furnace for tapping, sufficient silicomanganese is added in the pouring tapping process, and synthetic slag is used for slag washing;
s2 continuous casting and rolling
When hot continuous rolling is carried out, the continuously cast plate blank is reheated to 1240 ℃ and the furnace time is not less than 110min; the temperature range of the hot continuous rolling and the finish rolling is 900 ℃; after hot continuous rolling, rapidly cooling to 690 ℃ and 650 ℃ respectively by adopting a front-section cooling mode for carrying out grading control;
in the pickling and cold rolling process, the cold rolling reduction rate is controlled to be 65 percent;
s3 Heat treatment
And annealing and tempering the steel to obtain the special steel.
In this embodiment, the step S1 of performing bottom blowing of the converter by providing the oxygen lance in the furnace body further includes:
and in the blow-on stage, the position of the oxygen lance is lowered to 1200mm, and the lower lance is ignited to blow for 100s.
In this embodiment, further, adding lime and light burned dolomite after the oxygen blowing further includes:
the adding mass of the lime is 35% of the converter tapping amount, and the adding mass of the light burned dolomite is 13% of the converter tapping amount.
In this embodiment, further, annealing and tempering the steel material further includes:
the steel is sequentially subjected to isothermal annealing, general annealing, preheating and quenching, and is immediately subjected to secondary tempering after quenching.
In this embodiment, before the annealing, the steel material is heated to 930 ℃ and kept at the temperature for 1 hour.
In this embodiment, the preheating includes preheating the steel to 830C for 0.5 hour.
In the embodiment, further, the isothermal annealing is carried out for 2 hours when the temperature is cooled to 690 ℃.
In this embodiment, further, the secondary tempering includes: the first tempering is carried out at 530 ℃ and the temperature is kept for 1 hour; and the second tempering is carried out at 555 ℃ for 1 hour.
The high-strength special steel prepared by the production process comprises the following components in percentage by weight: carbon: 0.06%, silicon: 0.15%, manganese: 2.13%, phosphorus: 0.004%, chromium: 0.50%, nickel: 6.3%, copper: 0.45%, titanium: 3.0 percent; 2.1% of tungsten, and the balance of Fe and uncontrollable impurity elements.
EXAMPLE III
The embodiment of the invention discloses a production process of high-strength special steel, which comprises the following steps:
s1, converter bottom blowing smelting
After slag splashing treatment is carried out on the slag of the previous furnace, the final slag is completely left in the converter, then the raw materials are added into the furnace for smelting, during smelting, an oxygen lance is arranged in the furnace body for bottom blowing of the converter, lime and light burned dolomite are added after oxygen blowing, the smelted molten iron is poured out of the furnace for tapping, sufficient silicomanganese alloy is added in the pouring-out tapping process, and synthetic slag is used for slag washing;
s2 continuous casting and rolling
When hot continuous rolling is carried out, the continuously cast plate blank is reheated to 1250 ℃, and the furnace time is not less than 110min; the temperature range of the hot continuous rolling and the finish rolling is 920 ℃; after hot continuous rolling, respectively and rapidly cooling to 700 ℃ and 660 ℃ for coiling in a front-section cooling mode for graded control;
in the pickling and cold rolling process, the cold rolling reduction rate is controlled to be 80 percent;
s3 Heat treatment
And annealing and tempering the steel to obtain the special steel.
In this embodiment, further, in step S1, the method for performing bottom blowing of a converter by installing an oxygen lance in a furnace body further includes:
and in the blow starting stage, the lance position of the oxygen lance is lowered to 1300mm, and the lower lance is ignited to blow for 110s.
In this embodiment, further, the adding lime and the light-burned dolomite after the oxygen blowing further includes:
the adding mass of the lime is 40% of the converter tapping amount, and the adding mass of the light burned dolomite is 15% of the converter tapping amount.
In this embodiment, further, annealing and tempering the steel material further includes:
the steel is sequentially subjected to isothermal annealing, general annealing, preheating and quenching, and is immediately subjected to secondary tempering after quenching.
In this embodiment, further, before the annealing, the steel material is heated to 960 ℃ and kept at the temperature for 2 hours.
In this embodiment, the preheating includes preheating the steel to 850C for 1 hour.
In this embodiment, further, the isothermal annealing is performed by holding the temperature for 2 hours while cooling to 710 ℃.
In this embodiment, further, the secondary tempering includes: the first tempering is carried out for 1 hour at 540 ℃; and the second tempering is carried out for 1 hour at the temperature of 560 ℃.
The high-strength special steel prepared by the production process comprises the following components in percentage by weight: carbon: 0.07%, silicon: 0.2%, manganese: 2.25%, phosphorus: 0.005%, chromium: 0.55%, nickel: 9.5%, copper: 0.5%, titanium: 4.0 percent; 2.7 percent of tungsten, and the balance of Fe and uncontrollable impurity elements.
Modifications and variations of the present invention are within the scope of the claims and are not limited by the disclosure of the embodiments.
Claims (10)
1. A high-strength special steel is characterized in that: comprises the following components in percentage by weight:
carbon: 0.05 to 0.07%, silicon: 0.1 to 0.2%, manganese: 1.58 to 2.25%, phosphorus: 0.003 to 0.005%, chromium: 0.45 to 0.55%, nickel: 5.5 to 9.5%, copper: 0.4 to 0.5%, titanium: 2.0 to 4.0 percent; 1.3 to 2.7 percent of tungsten, and the balance of Fe and uncontrollable impurity elements.
2. The high strength specialty steel according to claim 1, wherein: comprises the following components in percentage by weight:
carbon: 0.06%, silicon: 0.15%, manganese: 2.13%, phosphorus: 0.004%, chromium: 0.50%, nickel: 6.3%, copper: 0.45%, titanium: 3.0 percent; 2.1 percent of tungsten and the balance of Fe and uncontrollable impurity elements.
3. A production process of a high strength special steel for producing the high strength special steel according to claim 1 or 2, characterized in that: the method comprises the following steps:
s1, converter bottom blowing smelting
After slag splashing treatment is carried out on the slag of the previous furnace, the final slag is completely left in the converter, then the raw materials are added into the furnace for smelting, during smelting, an oxygen lance is arranged in the furnace body for bottom blowing of the converter, lime and light burned dolomite are added after oxygen blowing, the smelted molten iron is poured out of the furnace for tapping, sufficient silicomanganese alloy is added in the pouring-out tapping process, and synthetic slag is used for slag washing;
s2 continuous casting and rolling
When in hot continuous rolling, the continuously cast plate blank is reheated to 1230-1250 ℃ and the furnace time is not less than 110min; the final rolling temperature range of the hot continuous rolling is 880-920 ℃; after hot continuous rolling, respectively and rapidly cooling to 670-700 ℃ coiling and 630-660 ℃ coiling in a front section cooling mode for hierarchical control;
in the pickling and cold rolling process, the cold rolling reduction rate is controlled to be 58-80 percent;
s3 Heat treatment
And annealing and tempering the steel to obtain the special steel.
4. A process for producing a high strength special steel according to claim 3, characterized in that: in the step S1, the converter bottom blowing is performed by arranging an oxygen lance in the furnace body, and the method further comprises the following steps:
and in the blowing stage, lowering the lance position of the oxygen lance to 1100-1300 mm, and firing the oxygen lance for 80s-110s.
5. A process for producing a high strength special steel according to claim 3, characterized in that: the process of adding lime and light-burned dolomite after oxygen blowing also comprises the following steps:
the adding mass of the lime is 30-40% of the converter tapping amount, and the adding mass of the soft-burned dolomite is 11-15% of the converter tapping amount.
6. A production process of a high strength special steel according to claim 3, characterized in that: the process of annealing and tempering the steel material further comprises:
the steel is sequentially subjected to isothermal annealing, general annealing, preheating and quenching, and is immediately subjected to secondary tempering after quenching.
7. A production process of a high-strength special steel according to claim 6, wherein: before annealing, the steel is heated to 900-960 ℃ and is kept warm for 1-2 hours.
8. A production process of a high-strength special steel according to claim 6, wherein: the preheating comprises preheating the steel to 800-850 ℃ and keeping for 0.5-1 hour.
9. The production process of a high strength special steel according to claim 6, characterized in that: the isothermal annealing is carried out for 2 hours when the temperature is cooled to 680-710 ℃.
10. A production process of a high-strength special steel according to claim 6, wherein: the secondary tempering comprises: the first tempering is carried out for 1 hour at the temperature of 510-540 ℃; and the second tempering is carried out at 550-560 ℃ for 1 hour.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210821408.XA CN115466903A (en) | 2022-07-13 | 2022-07-13 | High-strength special steel and production process thereof |
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