CN114318147A - Process method for prestressed low-relaxation high-strength alloy steel bar - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 63
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 48
- 238000010438 heat treatment Methods 0.000 claims abstract description 105
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 87
- 239000010959 steel Substances 0.000 claims abstract description 87
- 238000005096 rolling process Methods 0.000 claims abstract description 44
- 238000001816 cooling Methods 0.000 claims abstract description 41
- 238000005496 tempering Methods 0.000 claims abstract description 35
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000003723 Smelting Methods 0.000 claims abstract description 31
- 229910052786 argon Inorganic materials 0.000 claims abstract description 17
- 238000007664 blowing Methods 0.000 claims abstract description 17
- 238000009749 continuous casting Methods 0.000 claims abstract description 17
- 238000007670 refining Methods 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 238000004321 preservation Methods 0.000 claims abstract description 14
- 238000009847 ladle furnace Methods 0.000 claims description 29
- 239000012535 impurity Substances 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 230000035882 stress Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000032683 aging Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
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Abstract
The invention discloses a process method of a prestressed low-relaxation high-strength alloy steel bar, which comprises the steps of converter smelting, LF furnace refining, strong deoxidation, wire feeding, soft argon blowing, continuous casting full-protection pouring, electromagnetic stirring starting and billet smelting; cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then starting rolling the steel billet at 960-1000 ℃, and controlling rolling at 960-1000 ℃ in the whole process; controlling the tempering temperature of a cooling bed after the billet is rolled to be 780-830 ℃, and preserving the heat of a heat preservation cover of the cooling bed; and (3) carrying out offline heat treatment on the steel billet, wherein the heating temperature of the heat treatment is 850-960 ℃, and the tempering temperature is 470-580 ℃, and finally producing the prestress low-relaxation high-strength alloy steel bar meeting the national standard. The invention adopts the process route of controlled rolling and controlled cooling and offline heat treatment, and the manufactured steel bar has qualified mechanical property, low stress relaxation rate and higher elongation after fracture.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a process method of a prestressed low-relaxation high-strength alloy steel bar.
Background
The prestressed concrete is implemented in 2017, 9 and 1 in New national standard GB/T20065-2016 for twisted steel. The common on-line controlled rolling and controlled cooling finish rolling thread has the advantages that firstly, the aging period is long and reaches 2 months, secondly, the mechanical property allowance is not large, the mechanical property is high, the elongation after fracture is low, in order to ensure the elongation after fracture, the mechanical property is basically controlled at the standard edge, thirdly, the alloy addition amount is large, the cost is high, and fourthly, the stress relaxation rate is high.
Disclosure of Invention
The invention aims to provide a process method for preparing a prestressed low-relaxation high-strength alloy steel bar, which realizes qualified mechanical properties, low stress relaxation rate and no time-lapse period through different off-line heat treatment processes.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a process method of a prestressed low-relaxation high-strength alloy steel bar comprises the following components in percentage by weight: c: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities;
the production process method comprises the following steps:
s1, smelting a steel billet by adopting a converter, an LF furnace for refining, strong deoxidation, wire feeding, soft argon blowing, continuous casting and full-protection pouring, and starting electromagnetic stirring;
s2, cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then performing low-temperature rolling on the steel billet at 960-1000 ℃, and performing low-temperature controlled rolling at 960-1000 ℃ in the whole process;
s3, controlling cooling when the tempering temperature of the cooling bed is 780-830 ℃ after the billet is rolled, and insulating heat of the cooling bed heat-insulating cover;
s4, carrying out off-line heat treatment on the steel billet, wherein the heating temperature of the heat treatment is 850-960 ℃, and the tempering temperature is 470-580 ℃, and finally producing the prestress low-relaxation high-strength alloy steel bar meeting the national standard.
Preferably, the PSB785 phi 32 prestressed low-relaxation high-strength alloy steel bar comprises the following components in percentage by weight: c: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities;
the production process method comprises the following steps: smelting in a converter, refining in an LF (ladle furnace), strongly deoxidizing, feeding wires, soft argon blowing, continuous casting and full-protection pouring, starting electromagnetic stirring, and smelting to obtain a steel billet; cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then starting rolling the steel billet at 960-1000 ℃, and controlling rolling at 960-1000 ℃ in the whole process; controlling the tempering temperature of a cooling bed after the billet is rolled to be 780-830 ℃, and preserving the heat of a heat preservation cover of the cooling bed; and (3) carrying out offline heat treatment on the steel billet, wherein the heating temperature of the heat treatment is 850-880 ℃, and the tempering temperature is 550-580 ℃, and finally producing the prestress low-relaxation high-strength alloy steel bar meeting the national standard.
Preferably, the PSB830 phi 32 prestressed low-relaxation high-strength alloy steel bar comprises the following components in percentage by weight: c: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities;
the production process method comprises the following steps: smelting in a converter, refining in an LF (ladle furnace), strongly deoxidizing, feeding wires, soft argon blowing, continuous casting and full-protection pouring, starting electromagnetic stirring, and smelting to obtain a steel billet; cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then starting rolling the steel billet at 960-1000 ℃, and controlling rolling at 960-1000 ℃ in the whole process; controlling the tempering temperature of a cooling bed after the billet is rolled to be 780-830 ℃, and preserving the heat of a heat preservation cover of the cooling bed; and (3) carrying out off-line heat treatment on the steel billet, wherein the heating temperature of the heat treatment is 870 ℃ plus 900 ℃, and the tempering temperature is 530 ℃ plus 560 ℃, and finally producing the prestress low-relaxation high-strength alloy steel bar meeting the national standard.
Preferably, the PSB930 phi 32 prestressed low-relaxation high-strength alloy steel bar comprises the following components in percentage by weight: c: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities;
the production process method comprises the following steps: smelting in a converter, refining in an LF (ladle furnace), strongly deoxidizing, feeding wires, soft argon blowing, continuous casting and full-protection pouring, starting electromagnetic stirring, and smelting to obtain a steel billet; cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then starting rolling the steel billet at 960-1000 ℃, and controlling rolling at 960-1000 ℃ in the whole process; controlling the tempering temperature of a cooling bed after the billet is rolled to be 780-830 ℃, and preserving the heat of a heat preservation cover of the cooling bed; the steel billet is subjected to off-line heat treatment, the heating temperature of the heat treatment is 930 ℃ below zero and the tempering temperature is 530 ℃ below zero, and finally the prestress low-relaxation high-strength alloy steel bar meeting the national standard is produced.
Preferably, the PSB1080 phi 32 prestressed low-relaxation high-strength alloy steel bar comprises the following components in percentage by weight: c: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities;
the production process method comprises the following steps: smelting in a converter, refining in an LF (ladle furnace), strongly deoxidizing, feeding wires, soft argon blowing, continuous casting and full-protection pouring, starting electromagnetic stirring, and smelting to obtain a steel billet; cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then starting rolling the steel billet at 960-1000 ℃, and controlling rolling at 960-1000 ℃ in the whole process; controlling the tempering temperature of a cooling bed after the billet is rolled to be 780-830 ℃, and preserving the heat of a heat preservation cover of the cooling bed; and (3) carrying out offline heat treatment on the steel billet, wherein the heating temperature of the heat treatment is 930-960 ℃, and the tempering temperature is 470-500 ℃, and finally producing the prestress low-relaxation high-strength alloy steel bar meeting the national standard.
Compared with the prior art, the invention has the advantages that:
the invention adopts a process route of controlled rolling and controlled cooling and offline heat treatment, the initial rolling temperature is set to 960-1000 ℃, the finish rolling temperature is 960-1000 ℃, the tempering temperature of a cooling bed is 780-830 ℃, the heating temperature of the offline heat treatment is 960 ℃, the tempering temperature is 580 ℃ plus one year, the mechanical property of the prepared steel bar is qualified, the stress relaxation rate is low, the elongation after fracture is higher, and no aging period exists, so that the production scale is realized.
Detailed Description
A process method of a prestressed low-relaxation high-strength alloy steel bar comprises the following components in percentage by weight: c: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities;
the production process method comprises the following steps:
s1, smelting a steel billet by adopting a converter, an LF furnace for refining, strong deoxidation, wire feeding, soft argon blowing, continuous casting and full-protection pouring, and starting electromagnetic stirring;
s2, cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then performing low-temperature rolling on the steel billet at 960-1000 ℃, and performing low-temperature controlled rolling at 960-1000 ℃ in the whole process;
s3, controlling cooling when the tempering temperature of the cooling bed is 780-830 ℃ after the billet is rolled, and insulating heat of the cooling bed heat-insulating cover;
s4, carrying out off-line heat treatment on the steel billet, wherein the heating temperature of the heat treatment is 850-960 ℃, and the tempering temperature is 470-580 ℃, and finally producing the prestress low-relaxation high-strength alloy steel bar meeting the national standard.
Example one, rolling a PSB785 Φ 32 prestressed low-relaxation high-strength alloy steel bar:
the weight percentages of chemical components of the material are as follows: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities; smelting in a converter, refining in an LF (ladle furnace), strongly deoxidizing, feeding wires, soft argon blowing, continuous casting and full-protection pouring, starting electromagnetic stirring, and smelting to obtain a steel billet; cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then starting rolling the steel billet at 960-1000 ℃, and controlling rolling at 960-1000 ℃ in the whole process; controlling the tempering temperature of a cooling bed after the billet is rolled to be 780-830 ℃, and preserving the heat of a heat preservation cover of the cooling bed; and (3) carrying out offline heat treatment on the steel billet, wherein the heating temperature of the heat treatment is 850-880 ℃, and the tempering temperature is 550-580 ℃, and finally producing the PSB785 phi 32 prestressed low-relaxation high-strength alloy steel bar meeting the national standard.
The mechanical property parameters of the PSB785 phi 32 prestressed low-relaxation high-strength alloy steel bar are as follows: the yield strength is 850-900MPa, the tensile strength is 1050-1100MPa, the elongation after fracture is 11.0-13.5%, the maximum total elongation is 6.0-8.0%, and the stress relaxation rate is less than or equal to 3.5%.
Example two, rolling a PSB830 Φ 32 prestressed low-relaxation high-strength alloy steel bar:
the weight percentages of chemical components of the material are as follows: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities; smelting in a converter, refining in an LF (ladle furnace), strongly deoxidizing, feeding wires, soft argon blowing, continuous casting and full-protection pouring, starting electromagnetic stirring, and smelting to obtain a steel billet; cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then starting rolling the steel billet at 960-1000 ℃, and controlling rolling at 960-1000 ℃ in the whole process; controlling the tempering temperature of a cooling bed after the billet is rolled to be 780-830 ℃, and preserving the heat of a heat preservation cover of the cooling bed; and (3) carrying out offline heat treatment on the steel billet, wherein the heating temperature of the heat treatment is 870 ℃ minus 900 ℃, and the tempering temperature is 530 ℃ minus 560 ℃, and finally producing the PSB830 phi 32 prestressed low-relaxation high-strength alloy steel bar meeting the national standard.
The mechanical property parameters of the PSB830 phi 32 prestressed low-relaxation high-strength alloy steel bar are as follows: the yield strength is 880-930MPa, the tensile strength is 1100-1150MPa, the elongation after fracture is 11.0-13.5%, the maximum total elongation is 6.0-8.0%, and the stress relaxation rate is less than or equal to 3.5%.
Example three, rolling a PSB930 Φ 32 prestressed low-relaxation high-strength alloy steel bar:
the weight percentages of chemical components of the material are as follows: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities; smelting in a converter, refining in an LF (ladle furnace), strongly deoxidizing, feeding wires, soft argon blowing, continuous casting and full-protection pouring, starting electromagnetic stirring, and smelting to obtain a steel billet; cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then starting rolling the steel billet at 960-1000 ℃, and controlling rolling at 960-1000 ℃ in the whole process; controlling the tempering temperature of a cooling bed after the billet is rolled to be 780-830 ℃, and preserving the heat of a heat preservation cover of the cooling bed; the steel billet is subjected to offline heat treatment, the heating temperature of the heat treatment is 900-930 ℃, the tempering temperature is 500-530 ℃, and finally the PSB930 phi 32 prestress low-relaxation high-strength alloy steel bar meeting the national standard is produced.
The mechanical property parameters of the PSB930 phi 32 prestressed low-relaxation high-strength alloy steel bar are as follows: the yield strength is 1000-1050MPa, the tensile strength is 1150-1200MPa, the elongation after fracture is 9.5-12.0%, the maximum total elongation is 5.5-8.0%, and the stress relaxation rate is less than or equal to 3.5%.
Example four, rolling a PSB1080 Φ 32 prestressed low-relaxation high-strength alloy steel bar:
the weight percentages of chemical components of the material are as follows: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities; smelting in a converter, refining in an LF (ladle furnace), strongly deoxidizing, feeding wires, soft argon blowing, continuous casting and full-protection pouring, starting electromagnetic stirring, and smelting to obtain a steel billet; cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then starting rolling the steel billet at 960-1000 ℃, and controlling rolling at 960-1000 ℃ in the whole process; controlling the tempering temperature of a cooling bed after the billet is rolled to be 780-830 ℃, and preserving the heat of a heat preservation cover of the cooling bed; the steel billet is subjected to offline heat treatment, the heating temperature of the heat treatment is 930-960 ℃, the tempering temperature is 470-500 ℃, and finally the PSB1080 phi 32 prestress low-relaxation high-strength alloy steel bar meeting the national standard is produced.
The mechanical property parameters of the PSB1080 phi 32 prestressed low-relaxation high-strength alloy steel bar are as follows: the yield strength is 1150-1180MPa, the tensile strength is 1280-1300MPa, the elongation after fracture is 8.5-10.0%, the maximum total force elongation is 4.5-7.0%, and the stress relaxation rate is less than or equal to 3.5%.
Comparative example, rolling a PSB785 Φ 32 pre-stressed alloy steel bar:
the weight percentages of chemical components of the material are as follows: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities; smelting in a converter, refining in an LF (ladle furnace), strongly deoxidizing, feeding wires, soft argon blowing, continuous casting and full-protection pouring, starting electromagnetic stirring, and smelting to obtain a steel billet; cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1170 ℃ by the heating furnace, and then rolling the steel billet at the low temperature of 950-1010 ℃; controlling the tempering temperature of a cooling bed after the billet is rolled to be 650-680 ℃, and preserving the heat of a heat preservation cover of the cooling bed; finally producing the PSB785 phi 32 prestressed low-relaxation high-strength alloy steel bar meeting the national standard.
The mechanical property parameters of the PSB785 phi 32 prestressed low-relaxation high-strength alloy steel bar are as follows: the yield strength is 810-835MPa, the tensile strength is 860-950MPa, the elongation after fracture is 8.1-8.4%, the maximum total elongation is 4.2-6.0%, and the stress relaxation rate is less than or equal to 5.0%.
It can be seen from the above examples that the prestressed low-relaxation high-strength alloy steel bar produced by the method of the present invention has excellent yield strength, tensile strength, elongation and stress relaxation rate, compared to a steel bar which has not been subjected to off-line heat treatment.
Although the embodiments of the present invention have been described, various changes or modifications may be made by the patentee within the scope of the appended claims, and the scope of the present invention should be determined not to exceed the range described in the claims.
Claims (5)
1. A process method of a prestressed low-relaxation high-strength alloy steel bar is characterized by comprising the following components in percentage by weight: c: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities;
the production process method comprises the following steps:
s1, smelting a steel billet by adopting a converter, an LF furnace for refining, strong deoxidation, wire feeding, soft argon blowing, continuous casting and full-protection pouring, and starting electromagnetic stirring;
s2, cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then performing low-temperature rolling on the steel billet at 960-1000 ℃, and performing low-temperature controlled rolling at 960-1000 ℃ in the whole process;
s3, controlling cooling when the tempering temperature of the cooling bed is 780-830 ℃ after the billet is rolled, and insulating heat of the cooling bed heat-insulating cover;
s4, carrying out off-line heat treatment on the steel billet, wherein the heating temperature of the heat treatment is 850-960 ℃, and the tempering temperature is 470-580 ℃, and finally producing the prestress low-relaxation high-strength alloy steel bar meeting the national standard.
2. The process method of the prestressed low-relaxation high-strength alloy steel bar as claimed in claim 1, wherein the process method comprises the following steps: the PSB785 phi 32 prestressed low-relaxation high-strength alloy steel bar comprises the following components in percentage by weight: c: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities;
the production process method comprises the following steps: smelting in a converter, refining in an LF (ladle furnace), strongly deoxidizing, feeding wires, soft argon blowing, continuous casting and full-protection pouring, starting electromagnetic stirring, and smelting to obtain a steel billet; cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then starting rolling the steel billet at 960-1000 ℃, and controlling rolling at 960-1000 ℃ in the whole process; controlling the tempering temperature of a cooling bed after the billet is rolled to be 780-830 ℃, and preserving the heat of a heat preservation cover of the cooling bed; and (3) carrying out offline heat treatment on the steel billet, wherein the heating temperature of the heat treatment is 850-880 ℃, and the tempering temperature is 550-580 ℃, and finally producing the prestress low-relaxation high-strength alloy steel bar meeting the national standard.
3. The process method of the prestressed low-relaxation high-strength alloy steel bar as claimed in claim 1, wherein the process method comprises the following steps: the PSB830 phi 32 prestressed low-relaxation high-strength alloy steel bar comprises the following components in percentage by weight: c: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities;
the production process method comprises the following steps: smelting in a converter, refining in an LF (ladle furnace), strongly deoxidizing, feeding wires, soft argon blowing, continuous casting and full-protection pouring, starting electromagnetic stirring, and smelting to obtain a steel billet; cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then starting rolling the steel billet at 960-1000 ℃, and controlling rolling at 960-1000 ℃ in the whole process; controlling the tempering temperature of a cooling bed after the billet is rolled to be 780-830 ℃, and preserving the heat of a heat preservation cover of the cooling bed; and (3) carrying out off-line heat treatment on the steel billet, wherein the heating temperature of the heat treatment is 870 ℃ plus 900 ℃, and the tempering temperature is 530 ℃ plus 560 ℃, and finally producing the prestress low-relaxation high-strength alloy steel bar meeting the national standard.
4. The process method of the prestressed low-relaxation high-strength alloy steel bar as claimed in claim 1, wherein the process method comprises the following steps: the PSB930 phi 32 prestressed low-relaxation high-strength alloy steel bar comprises the following components in percentage by weight: c: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities;
the production process method comprises the following steps: smelting in a converter, refining in an LF (ladle furnace), strongly deoxidizing, feeding wires, soft argon blowing, continuous casting and full-protection pouring, starting electromagnetic stirring, and smelting to obtain a steel billet; cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then starting rolling the steel billet at 960-1000 ℃, and controlling rolling at 960-1000 ℃ in the whole process; controlling the tempering temperature of a cooling bed after the billet is rolled to be 780-830 ℃, and preserving the heat of a heat preservation cover of the cooling bed; the steel billet is subjected to off-line heat treatment, the heating temperature of the heat treatment is 930 ℃ below zero and the tempering temperature is 530 ℃ below zero, and finally the prestress low-relaxation high-strength alloy steel bar meeting the national standard is produced.
5. The process method of the prestressed low-relaxation high-strength alloy steel bar as claimed in claim 1, wherein the process method comprises the following steps: the PSB1080 phi 32 prestressed low-relaxation high-strength alloy steel bar comprises the following components in percentage by weight: c: 0.40-0.45%, Si: 1.40-1.60%, Mn: 0.8-1.0%, S is less than or equal to 0.020%, P is less than or equal to 0.020%, V: 0.050-0.070%, and the balance of Fe and inevitable impurities;
the production process method comprises the following steps: smelting in a converter, refining in an LF (ladle furnace), strongly deoxidizing, feeding wires, soft argon blowing, continuous casting and full-protection pouring, starting electromagnetic stirring, and smelting to obtain a steel billet; cold loading the steel billet into a heating furnace, heating the steel billet to 1050-1180 ℃ by the heating furnace, then starting rolling the steel billet at 960-1000 ℃, and controlling rolling at 960-1000 ℃ in the whole process; controlling the tempering temperature of a cooling bed after the billet is rolled to be 780-830 ℃, and preserving the heat of a heat preservation cover of the cooling bed; and (3) carrying out offline heat treatment on the steel billet, wherein the heating temperature of the heat treatment is 930-960 ℃, and the tempering temperature is 470-500 ℃, and finally producing the prestress low-relaxation high-strength alloy steel bar meeting the national standard.
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| CN101429619A (en) * | 2008-12-15 | 2009-05-13 | 中国钢研科技集团公司 | High-strength steel tension rod and thermal treatment method thereof |
| CN106350733A (en) * | 2016-09-19 | 2017-01-25 | 石横特钢集团有限公司 | PSB1080 finish-rolled threaded bar and production process thereof |
| CN110453149A (en) * | 2019-09-12 | 2019-11-15 | 石横特钢集团有限公司 | A kind of high-intensity fine rolling screw-thread steel and its production technology |
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