CN110257705B - Steel for prestressed concrete steel bar not easy to brittle fracture and production method thereof - Google Patents
Steel for prestressed concrete steel bar not easy to brittle fracture and production method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- 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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- C—CHEMISTRY; METALLURGY
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- C—CHEMISTRY; METALLURGY
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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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
- 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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- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a steel for a prestressed concrete steel bar difficult to brittle fracture and a production method thereof, wherein the steel comprises the following chemical components in percentage by mass: c: 0.25 to 0.35%, Si: 1.10-1.40%, Mn: 0.55-0.75%, P: less than or equal to 0.025% and S: less than or equal to 0.010 percent, and the balance of Fe and inevitable impurities. The method can ensure that material gas, impurities, mechanical properties and the like meet material requirements, meet the requirements of wire rods for processing steel rods, improve the tempering temperature of heat treatment under the condition that the strength of the steel rods is not reduced, greatly reduce the fracture proportion of prestressed concrete steel rods, improve the yield and production efficiency, and save energy and user production cost.
Description
Technical Field
The invention belongs to the field of alloy smelting, relates to steel for a prestressed concrete steel bar, and particularly relates to steel for a prestressed concrete steel bar which is not easy to brittle fracture and a production method thereof.
Background
The steel grade of the steel for the prestressed concrete steel bar is generally high silicon steel (Si is more than 1.40 percent) and low silicon steel (Si is 0.70 to 1.10 percent); it has high strength, toughness, low looseness, high binding power to concrete, good weldability, upsetting property and saving in material
The steel bar can replace
Hot rolled steel bars) and the like, has been widely applied to prestressed members such as high-strength prestressed concrete centrifugal pipe piles, electric poles, overhead piers, railway sleepers and the like abroad, and has a very wide market in the world, particularly Asia.
The traditional prestressed concrete steel bar is designed by adopting low silicon (the content of Si is generally 0.70-0.90%), so that the steel bar has high fracture ratio and poor relaxation property in the use process, and brings certain risks and hidden dangers to the use stability of the steel bar.
Disclosure of Invention
In view of the technical defects, the invention aims to provide steel for a prestressed concrete steel bar, which is not easy to brittle fracture.
In order to solve the technical problems, the invention adopts the following technical scheme: the steel for the prestressed concrete steel bar is not easy to brittle fracture and comprises the following chemical components in percentage by mass: 0.25 to 0.35%, Si: 1.10-1.40%, Mn: 0.55-0.75%, P: less than or equal to 0.025% and S: less than or equal to 0.010 percent, and the balance of Fe and inevitable impurities.
Optimally, the material consists of the following chemical components in percentage by mass, C: 0.29 to 0.34%, Si: 1.20-1.30%, Mn: 0.64-0.72%, P: less than or equal to 0.018%, and S: less than or equal to 0.010 percent, and the balance of Fe and inevitable impurities; particularly preferably, the material comprises the following chemical components in percentage by mass: 0.32%, Si: 1.25%, Mn: 0.68%, P: less than or equal to 0.015% and S: less than or equal to 0.008 percent, and the balance of Fe and inevitable impurities.
The invention also aims to provide a preparation method of the steel for the prestressed concrete steel bar, the line number of which is not easy to brittle fracture, which comprises the following steps:
(a) carrying out converter steelmaking by taking molten iron and scrap steel as raw materials to obtain molten steel; the tapping temperature of the molten steel is 1600-1650 ℃, 3-5 kg of lime, 1-1.5 kg of ferrosilicon and 8-10 kg of silicon-manganese alloy are added into each ton of molten steel during tapping of the molten steel, and the mass percent content of C, P and S in the molten steel is controlled to be 0.05-0.15%, 0.001-0.020% and 0.005-0.030%, respectively;
(b) carrying out LF refining on the molten steel; the LF refining comprises the step of deoxidizing the molten steel by using auxiliary materials to make white slag, wherein the addition amount of the auxiliary materials is that 4-5 kg of lime, 2-4 kg of fluorite and 0.5-1.5 kg of calcium carbide particles are added into each ton of the molten steel; the temperature of the molten steel entering the LF is 1530-1580 ℃, and the temperature of the molten steel discharged from the LF is 1540-1580 ℃;
(c) continuously casting the molten steel obtained in the step (b) to obtain a casting blank, wherein the superheat degree of the continuous casting is 15-40 ℃;
(d) and rolling and forming the casting blank.
Optimally, in the step (b), the LF refining time is 20-40 min, and the white slag holding time is 10-20 min.
Optimally, in the step (b), after the LF refining is finished, feeding a calcium-silicon wire into the molten steel, and then soft-blowing argon to the molten steel; the addition amount of the calcium silicate wire is 0.1-0.3 kg per ton of molten steel, the soft argon blowing time is 10-20 min, and the soft argon blowing flow strength is 0.5-1.0 NL/min/t.
Optimally, in the step (d), the casting blank is heated by a heat accumulating type blast furnace gas heating furnace so that the temperature difference of the head part, the tail part and the middle part of the casting blank is not more than 30 ℃, and the casting blank is subjected to tapping rolling at 930-990 ℃.
The invention has the beneficial effects that: the steel for the prestressed concrete steel bar, which is not easy to brittle fracture, has the synergistic effects of uniform steel quality, high cleanliness, good surface quality, low inclusion content, high purity, small segregation and fluctuation of components of a poker bar, stable mechanical property, fine grains and the like due to the adoption of the chemical components with specific mass percentage; the preparation method of the steel for the prestressed concrete steel bar not easy to brittle fracture can ensure that material gas, impurities, mechanical properties and the like meet the requirements of wire rod processing of the steel bar, reduce the fracture proportion of the steel bar, ensure the steel quality of the steel for the prestressed concrete steel bar not easy to brittle fracture, improve the tempering temperature of heat treatment under the condition that the strength of the steel bar is not reduced, improve the yield and the production efficiency, save energy, reduce carbon dioxide emission, protect the environment and save the production cost of users.
Detailed Description
The steel for the prestressed concrete steel bar, which is not easy to brittle fracture, comprises the following chemical components in percentage by mass: 0.25 to 0.35%, Si: 1.10-1.40%, Mn: 0.55-0.75%, P: less than or equal to 0.025% and S: less than or equal to 0.010 percent, and the balance of Fe and inevitable impurities. The steel bar has the beneficial effects that the silicon content is improved, the manganese content is reduced, and the chemical components with specific mass percentage are obtained by matching with adjustment of the content of other elements, so that the steel bar has the synergistic effects of uniform steel quality, high cleanliness, good surface quality, low inclusion content, high cleanliness, small segregation and fluctuation of components of a poker bar, stable mechanical performance, fine grains and the like.
The composite material preferably comprises the following chemical components in percentage by mass: 0.29 to 0.34%, Si: 1.20-1.30%, Mn: 0.64-0.72%, P: less than or equal to 0.018%, and S: less than or equal to 0.010 percent, and the balance of Fe and inevitable impurities; most preferably, C: 0.32%, Si: 1.25%, Mn: 0.68%, P: less than or equal to 0.015% and S: less than or equal to 0.008 percent, and the balance of Fe and inevitable impurities.
The preparation method of the steel for the prestressed concrete steel bar difficult to brittle fracture comprises the following steps: (a) carrying out converter steelmaking by taking molten iron and scrap steel as raw materials to obtain molten steel; the tapping temperature of the molten steel is 1600-1650 ℃, 3-5 kg of lime, 10-15 kg of ferrosilicon and 8-10 kg of silicon manganese are added into each ton of molten steel during tapping of the molten steel, and the mass percent content of C, P and S in the molten steel is controlled to be 0.05-0.15%, 0.001-0.020% and 0.005-0.030%, respectively; (b) performing LF refining on the molten steel, wherein the LF refining comprises the step of deoxidizing the molten steel by using auxiliary materials to make white slag, and the addition amount of the auxiliary materials is 4-5 kg of lime, 2-4 kg of fluorite and 0.5-1.5 kg of calcium carbide particles added into each ton of the molten steel; the temperature of the molten steel entering the LF furnace is 1530-1580 ℃, and the temperature of the molten steel discharged out of the LF furnace is 1550-1580 ℃; (c) continuously casting the molten steel obtained in the step (b) to obtain a casting blank, wherein the superheat degree of the continuous casting is 15-40 ℃; (d) and rolling and forming the casting blank to obtain the wire rod. The method can ensure that material gas, impurities, mechanical properties and the like meet the requirements of wire rod processing steel rods, reduce the fracture proportion of the steel rods, ensure the steel quality of the steel for the prestressed concrete steel rods which are not easy to brittle fracture, improve the tempering temperature of heat treatment under the condition that the strength of the steel rods is not reduced, improve the yield and the production efficiency, save energy, reduce the emission of carbon dioxide, protect the environment and save the production cost of users.
In the step (b), when the temperature of the molten steel entering the LF furnace is 1530-1580 ℃ and the temperature of the molten steel led out of the LF furnace is 1540-1580 ℃, the LF refining time is 20-40 min, and the white slag holding time is 10-20 min. In the step (b), after LF refining is finished, feeding a calcium silicate wire into molten steel, and then soft-blowing argon into the molten steel; the addition amount of the calcium-silicon wire is 0.1-0.3 kg per ton of molten steel, the soft argon blowing time is 10-20 min, and the soft argon blowing flow strength is 0.5-1.0 NL/min/t, so that impurities in the steel can be effectively removed.
In the step (d), the casting blank is heated by a heat accumulating type blast furnace gas heating furnace to ensure that the temperature difference of the head part, the tail part and the middle part of the casting blank is not more than 30 ℃, and the casting blank is subjected to tapping rolling at 930-990 ℃; the reason is that the water beam structure is arranged in the regenerative blast furnace gas heating furnace, so that the black print on the surface of the billet can be eliminated; the heating capacity of 1250 ℃ can ensure that the steel billet is rolled by the steel tapping at 960 +/-30 ℃, and the core surface temperature of the steel billet discharged from the furnace can be kept consistent by a three-section heating mode with the length of 20m so as to ensure the quality of the casting blank. In the rolling process, the rolling mill adopts the conventional horizontal and vertical alternative arrangement, so that the rolled piece is prevented from twisting during rolling, and the surface quality of the rolled piece is improved; the high-hardness and high-wear-resistance carbide roller rings are adopted in the pre-finishing mill group and the finishing mill group to roll the rolled piece, so that the surface of the rolled piece is smooth, the quality of the rolled piece meets the requirements of users, and the product size can meet the requirement of C-grade precision in GB/T14981. And cooling (slow cooling) is carried out on the rolled piece in the rolling process to control the rolling temperature of the product, so that the dynamic recrystallization and dynamic recovery of the product structure are further controlled, and the purpose of controlling the homogenization of the product structure form is achieved. In the cooling process after rolling the product, the product is spun and looped at the temperature range of 10-20 ℃ higher than the phase transition temperature by controlling the cooling equipment, and the transformation incubation period of the product before phase transition and the cooling speed in the phase transition process can be controlled to be not more than 1 ℃/s, so that the structure transformation of the product is approximate to the structure transformation in a balanced state, the product can obtain a coarse ferrite structure with uniform shape, the product can obtain more excellent plastic processing performance, and the product is more favorable for performing larger deformation without surface cracking in the subsequent processing process.
The invention is described in detail below with reference to the examples shown:
examples 1 to 3 and comparative examples 1 to 2 respectively provide a steel for a prestressed concrete steel bar and a preparation method thereof, wherein the chemical composition of the steel in each example is shown in table 1:
TABLE 1 chemical element content table of steel for prestressed concrete steel bars of examples 1 to 3 and comparative examples 1 to 2
| Content (wt%) | C | Si | Mn | P | S |
| Example 1 | 0.25 | 1.40 | 0.55 | 0.025 | 0.010 |
| Example 2 | 0.35 | 1.10 | 0.75 | 0.020 | 0.005 |
| Example 3 | 0.29 | 1.30 | 0.72 | 0.018 | 0.008 |
| Example 4 | 0.34 | 1.20 | 0.64 | 0.015 | 0.005 |
| Example 5 | 0.32 | 1.25 | 0.68 | 0.015 | 0.005 |
| Comparative example 1 | 0.25 | 0.86 | 0.70 | 0.015 | 0.005 |
| Comparative example 2 | 0.25 | 1.25 | 0.95 | 0.015 | 0.005 |
The preparation method of the steel for the prestressed concrete steel bar difficult to brittle fracture comprises the following steps:
(a) molten iron and scrap steel (the mass of the scrap steel is about 20 percent of the mass of the whole raw materials) are taken as raw materials to carry out converter steelmaking to obtain molten steel; adjusting the temperature of molten steel to be about 1600-1650 ℃ when tapping is to be carried out, adding 3-5 kg of lime, 10-15 kg of ferrosilicon and 8-10 kg of silicon manganese (the specific addition amount in each embodiment is selected according to the chemical component content to be controlled) into each ton of molten steel when tapping is carried out on the molten steel, and controlling the mass percent content of C, P and S in the molten steel to be 0.05-0.15%, 0.001-0.020% and 0.005-0.030%, respectively;
(b) carrying out LF refining on molten steel: the LF refining comprises the steps of using auxiliary materials to make white slag to deoxidize molten steel, wherein the addition amount of the auxiliary materials is 4-5 kg of lime, 2-4 kg of fluorite and 0.5-1.5 kg of calcium carbide particles added into each ton of molten steel (the specific addition amount in each embodiment is selected according to the chemical component content to be controlled); the temperature of molten steel entering the LF is 1530-1580 ℃, the temperature of molten steel led out of the LF is 1540-1580 ℃, the LF refining time is 20-40 min, and the white slag holding time is 10-20 min; after LF refining is finished, feeding a calcium-silicon wire into the molten steel, and then soft-blowing argon into the molten steel; the adding amount of the calcium silicate wire is 0.1-0.3 kg per ton of molten steel, the soft argon blowing time is 10-20 min, and the soft argon blowing flow strength is 0.5-1.0 NL/min/t;
(c) continuously casting the molten steel obtained in the step (b) to obtain a casting blank, wherein the superheat degree of the continuous casting is 15-40 ℃;
(d) heating the casting blank by adopting a heat accumulating type blast furnace gas heating furnace to ensure that the temperature difference of the head part, the tail part and the middle part of the casting blank is not more than 30 ℃, and carrying out tapping rolling on the casting blank at 930-990 ℃ to obtain a wire rod; and then in the cooling process after rolling, directly spinning and looping the rolled product (with the specification of phi 6.5-20) at the temperature range (870-890 ℃) which is 10-20 ℃ higher than the phase transition temperature by controlling cooling equipment.
And comparative examples 1 to 2 each provide a method of preparing a steel for a prestressed concrete steel bar, which is substantially identical to that of example 5, except that: the steel grades have different contents of silicon and manganese (the comparative examples 1 and 2 need to be carefully controlled to be low in silicon and high in manganese).
The steel (wire rod) for prestressed concrete steel rods obtained in each of the above examples was subjected to performance tests, and the results thereof are shown in table 2.
Table 2 test table for performance of wire rod manufactured in examples 1 to 3 and comparative examples 1 to 2
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (1)
1. The steel for the prestressed concrete steel bar is not easy to brittle fracture, and is characterized by comprising the following chemical components in percentage by mass: 0.32%, Si: 1.25%, Mn: 0.68%, P: 0.015% and S: 0.005%, and the balance of Fe and inevitable impurities; the steel for the prestressed concrete steel bar difficult to brittle fracture has a thick ferrite structure with uniform shape, the tensile strength of the steel is 689 MPa, the reduction of area is 55%, and the preparation method of the steel for the prestressed concrete steel bar difficult to brittle fracture comprises the following steps:
(a) carrying out converter steelmaking by taking molten iron and scrap steel as raw materials to obtain molten steel; adjusting the temperature of molten steel to 1600-1650 ℃ when tapping is to be carried out, adding 3-5 kg of lime, 10-15 kg of ferrosilicon and 8-10 kg of silicomanganese into the molten steel when tapping is carried out on the molten steel, and controlling the mass percent content of C, P and S in the molten steel to be 0.05-0.15%, 0.001-0.020% and 0.005-0.030%, respectively; the mass of the scrap steel is 20 percent of the mass of the whole raw material;
(b) carrying out LF refining on molten steel: the LF refining comprises the steps of using auxiliary materials to make white slag to deoxidize molten steel, wherein the addition amount of the auxiliary materials is 4-5 kg of lime, 2-4 kg of fluorite and 0.5-1.5 kg of calcium carbide particles added into each ton of molten steel; the temperature of molten steel entering the LF is 1530-1580 ℃, the temperature of molten steel led out of the LF is 1540-1580 ℃, the LF refining time is 20-40 min, and the white slag holding time is 10-20 min; after LF refining is finished, feeding a calcium-silicon wire into the molten steel, and then soft-blowing argon into the molten steel; the adding amount of the calcium silicate wire is 0.1-0.3 kg per ton of molten steel, the soft argon blowing time is 10-20 min, and the soft argon blowing flow strength is 0.5-1.0 NL/min/t; so that the molten steel comprises the following components: c: 0.32%, Si: 1.25%, Mn: 0.68%, P: 0.015% and S: 0.005%, and the balance of Fe and inevitable impurities;
(c) continuously casting the molten steel obtained in the step (b) to obtain a casting blank, wherein the superheat degree of the continuous casting is 15-40 ℃;
(d) heating the casting blank by adopting a heat accumulating type blast furnace gas heating furnace to ensure that the temperature difference of the head part, the tail part and the middle part of the casting blank is not more than 30 ℃, and carrying out tapping rolling on the casting blank at 930-990 ℃ to obtain a wire rod; and then in the cooling process after rolling, directly spinning the rolled product into rings with the specification of phi 6.5-20 at 870-890 ℃ by controlling cooling equipment, wherein the cooling speed in the transformation induction period before phase transformation and the phase transformation process is not more than 1 ℃/s.
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| PCT/CN2020/096482 WO2021000729A1 (en) | 2019-07-02 | 2020-06-17 | Non-brittle steel for prestressed concrete steel bar, and production method therefor |
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| CN110747404B (en) * | 2019-10-31 | 2021-04-02 | 鞍钢股份有限公司 | 1570 MPa-grade delayed fracture resistant steel bar and manufacturing method thereof |
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| JP2001073080A (en) * | 1999-08-31 | 2001-03-21 | Nippon Steel Corp | High tensile strength steel excellent in delayed fracture characteristic and its production |
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| CN108660386A (en) * | 2018-05-17 | 2018-10-16 | 常熟市龙腾特种钢有限公司 | A kind of standard component alloy steel wire rod |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021000729A1 (en) | 2021-01-07 |
| CN110257705A (en) | 2019-09-20 |
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Denomination of invention: The invention relates to a steel for prestressed concrete steel bar which is not easy to brittle fracture and a production method thereof Effective date of registration: 20211105 Granted publication date: 20210702 Pledgee: Agricultural Bank of China Limited by Share Ltd. Changshu branch Pledgor: CHANGSHU LONGTENG SPECIAL STEEL Co.,Ltd.|CHANGSHU LONGTENG ROLLING ELEMENT Co.,Ltd. Registration number: Y2021320010443 |
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Date of cancellation: 20230504 Granted publication date: 20210702 Pledgee: Agricultural Bank of China Limited by Share Ltd. Changshu branch Pledgor: CHANGSHU LONGTENG SPECIAL STEEL Co.,Ltd.|CHANGSHU LONGTENG ROLLING ELEMENT Co.,Ltd. Registration number: Y2021320010443 |