CN105483544A - 500MPa anti-seismic coiled thread steel and processing method thereof - Google Patents
500MPa anti-seismic coiled thread steel and processing method thereof Download PDFInfo
- Publication number
- CN105483544A CN105483544A CN201510975795.2A CN201510975795A CN105483544A CN 105483544 A CN105483544 A CN 105483544A CN 201510975795 A CN201510975795 A CN 201510975795A CN 105483544 A CN105483544 A CN 105483544A
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- CN
- China
- Prior art keywords
- 500mpa
- antidetonation
- valve snail
- steel
- rolling
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Classifications
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
-
- 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
-
- 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
Abstract
The invention discloses 500MPa anti-seismic coiled thread steel and a processing method thereof. The 500MPa anti-seismic coiled thread steel comprises, by weight, 0.19-0.25% of C, 0.45-0.70% of Si, 1.2-1.50% of Mn, less than or equal to 0.04% of S, less than or equal to 0.04% of P, and 0.08-0.12% of V. Compared with the general production controlled cooling technology, the number of started fans is reduced greatly, and some heat preservation cover caps are closed. The cooling quality of HRB500E high-strength anti-seismic coiled thread steel is optimized, and the performance index of the total elongation at maximum force of a product is increased.
Description
Technical field
The invention belongs to construction(al)steel wire rolling field, particularly relate to a kind of 500MPa antidetonation valve snail steel and working method thereof.
Background technology
The production technique of current Twisted Steel mainly based on vertical bar, technical process: steel billet → process furnace heating → continuous mill rolling → wear water management cooling → double length shearing → cold bed → scale → warehouse-in.Vertical bar Twisted Steel is because in construction, reinforcing bar utilization ratio is lower, cost is higher, and a lot of enterprise starts to produce small dimension Twisted Steel with high-speed rod-rolling mill, with coil form delivery, mainly based on small dimension φ 8 ~ 14mm.Along with Highrise buildings, important engineering are to the increase in demand of HRB500E high-strength anti-seismic valve snail, national industrial policies also require the application promoting high-strength anti-seismic valve snail.When producing small dimension high-strength anti-seismic valve snail with high-speed rod-rolling mill, the important mechanical performance index of high-strength anti-seismic valve snail, the fluctuation of maximum, force percentage of total elongation is comparatively large, very difficult to be controlled, and causes a large amount of waste product.Cool quality in valve snail production process not as vertical bar Twisted Steel, after valve snail sampling alignment, in mechanical properties test, maximum, force percentage of total elongation is far below vertical bar Twisted Steel, and large with circle performance inconsistency.Because high-speed rod-rolling mill air-cooled line cooling power is comparatively strong, span of control is wider, when the operation of rolling and roller repairing controlled not at that time, valve snail easily produces bainite structure or Widmannstatten structure, brings risk to the production of high-strength anti-seismic valve snail valve snail and use.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of 500MPa antidetonation valve snail steel and working method thereof, small dimension (φ 8 ~ 14mm) HRB500E high-strength anti-seismic Twisted Steel is produced with high-speed rod-rolling mill, avoid producing bainite structure or Widmannstatten structure, improve product maximum, force percentage of total elongation performance index, the valve snail product of production meets the performance requriements of HRB500E high-strength anti-seismic valve snail.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of 500MPa antidetonation valve snail steel, contains: C:0.19-0.25% according to weight percent, Si:0.45-0.70%, Mn:1.2-1.50%, S≤0.04%, P≤0.04%, V:0.08-0.12%.
Contain according to weight percent: C:0.22-0.23%, Si:0.52-0.58%, Mn:1.42-1.49%, S≤0.031%, P≤0.023%, V:0.084-0.118%.
Metallographic structure is ferrite+perlite, organizes grain fineness number to be 10 grades.
A working method for above-mentioned 500MPa antidetonation valve snail steel, comprises the steps:
(1) hot metal pretreatment;
(2) converter smelting;
(3) induction stirring;
(4) billet continuous casting;
(5) high-speed rod heating, cooling controlling and rolling controlling process.
High line heating, cooling controlling and rolling controlling process are: 65 ~ 100 minutes heating steel billet time, Heating temperature 1000 ~ 1200 DEG C, furnace pressure control≤5 handkerchiefs.
Whole process temperature control is taked to Rolling production, wherein: start rolling temperature controls at 1000 ~ 1100 DEG C; In roll control temperature at 950 DEG C-1020 DEG C; Finishing rolling control temperature is at 900 DEG C-980 DEG C; Wear water laying temperature after rolling to control at 870 DEG C-910 DEG C.
Air-cooled line opens 2 Fans altogether, and wherein First opens 60%, middle wind turbine Close All, and last Fans opens 100%.
Air-cooled line roller-way travelling speed 0.42 ~ 0.80m/s.
Stay-warm case has 40, and 1# ~ 18# insulation shroud is all opened, 19# ~ 26# insulation shroud Close All, 27# ~ 30# insulation shroud are opened, 31# ~ 32# insulation shroud is closed, 33# ~ 40# insulation shroud is all opened.
A technical scheme tool in technique scheme has the following advantages or beneficial effect, compares significantly minimizing blower fan unlatching number of units, closed portion insulation shroud with usual cooling control technology of producing.Optimize HRB500E high-strength anti-seismic valve snail cooling quality, improve product maximum, force percentage of total elongation performance index.φ 8 of the present invention, φ 10 millimeters of specification HRB500E hot rolling antidetonation valve snails, maximum, force percentage of total elongation Agt11 ~ 14%, the reinforcing bar actual measurement yield strength of yield strength (ReL) 520 ~ 600MPa, tensile strength (Rm) 740 ~ 780MPa, strong flexor ratio (Rm/ReL) 1.33 ~ 1.52, unit elongation (A) 22 ~ 28%, reinforcing bar are 1.03 ~ 1.20 with the ratio of standard regulation yield strength.The metallographic structure obtained is ferrite+perlite, prior austenite grain size 10 grades.Meet the requirements of GB1499.2-2007 to HRB500E anti-seismic steel bar completely.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below embodiment of the present invention is described further in detail.
Technical scheme is: the chemical composition (% by weight) of (1) employing reinforcing bar is: C0.19-0.25%, Si0.45-0.70%, Mn1.2-1.50%, S≤0.04%, P≤0.04%, V0.08-0.12%.Wherein V add-on Φ 8mm specification adds by lower limit, the above specification of Φ 10mm adds by the upper limit.(2) operational path: adopt hot metal pretreatment → converter smelting → induction stirring (weak stir) → 140mm × 140mm billet continuous casting → high-speed rod cooling controlling and rolling controlling process.Wherein finish to gauge speed Φ 8mm specification is 88.54 meter per seconds, Φ 10mm specification is 56.67 meter per seconds.(3) high line heating, cooling controlling and rolling controlling process are: 65 ~ 100 minutes heating steel billet time, Heating temperature 1000 ~ 1200 DEG C, furnace pressure control≤5 handkerchiefs; Whole process temperature control is taked to Rolling production, wherein: start rolling temperature controls at 1000 ~ 1100 DEG C; In roll control temperature at 950 DEG C-1020 DEG C; Finishing rolling control temperature is at 900 DEG C-980 DEG C; Wear water laying temperature after rolling to control at 870 DEG C-910 DEG C.Air-cooled line opens 2 Fans altogether, and wherein First opens 60% middle wind turbine Close All, last Fans opens 100%; Air-cooled line roller-way travelling speed 0.42 ~ 0.80m/s; Wherein roller-way input section and 1 section of speed are 0.42m/s, 2 sections of speed is 0.46m/s, 3 sections of speed is 0.50m/s, 4 sections of speed is 0.54m/s, 5 sections of speed is 0.58m/s, 6 sections of speed is 0.62m/s, 7 sections of speed is 0.66m/s, 8 sections of speed is 0.70m/s, 9 sections of speed is 0.74m/s, 10 sections and deferent segment speed are 0.80m/s.1# ~ 18# insulation shroud is all opened, 19# ~ 26# insulation shroud Close All, 27# ~ 30# insulation shroud are opened, 31# ~ 32# insulation shroud is closed, 33# ~ 40# insulation shroud is all opened.It is characterized in that with usually produce cooling control technology compare significantly reduce blower fan open number of units, closed portion insulation shroud.Optimize HRB500E high-strength anti-seismic valve snail cooling quality, improve product maximum, force percentage of total elongation performance index.
Compared with prior art, the φ 8 produced with the present invention, φ 10 millimeters of specification HRB500E hot rolling antidetonation valve snails, maximum, force percentage of total elongation Agt11 ~ 14%, the reinforcing bar actual measurement yield strength of yield strength (ReL) 520 ~ 600MPa, tensile strength (Rm) 740 ~ 780MPa, strong flexor ratio (Rm/ReL) 1.33 ~ 1.52, unit elongation (A) 22 ~ 28%, reinforcing bar are 1.03 ~ 1.20 with the ratio of standard regulation yield strength.The metallographic structure obtained is ferrite+perlite, prior austenite grain size 10 grades.Meet the requirements of GB1499.2-2007 to HRB500E anti-seismic steel bar completely.
Embodiment of the present invention chemical composition is in table 1, and performance is in table 2.
Table 1 embodiment of the present invention chemical composition (%)
| Embodiment | Specification | C | Si | Mn | P | S | V |
| 1 | Φ10 | 0.23 | 0.54 | 1.49 | 0.022 | 0.012 | 0.118 |
| 2 | Φ10 | 0.22 | 0.58 | 1.45 | 0.025 | 0.015 | 0.116 |
| 3 | Φ8 | 0.22 | 0.52 | 1.43 | 0.029 | 0.022 | 0.084 |
| 4 | Φ8 | 0.22 | 0.57 | 1.42 | 0.031 | 0.023 | 0.088 |
Table 2 embodiment of the present invention performance
Above to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (9)
1. a 500MPa antidetonation valve snail steel, is characterized in that, contain according to weight percent: C:0.19-0.25%, Si:0.45-0.70%, Mn:1.2-1.50%, S≤0.04%, P≤0.04%, V:0.08-0.12%.
2. 500MPa antidetonation valve snail steel as claimed in claim 1, is characterized in that, contain according to weight percent: C:0.22-0.23%, Si:0.52-0.58%, Mn:1.42-1.49%, S≤0.031%, P≤0.023%, V:0.084-0.118%.
3. 500MPa antidetonation valve snail steel as claimed in claim 1, it is characterized in that, metallographic structure is ferrite+perlite, organizes grain fineness number to be 10 grades.
4. a working method for the 500MPa antidetonation valve snail steel as described in as arbitrary in claim 1-3, is characterized in that, comprise the steps:
(1) hot metal pretreatment;
(2) converter smelting;
(3) induction stirring;
(4) billet continuous casting;
(5) high-speed rod heating, cooling controlling and rolling controlling process.
5. the working method of 500MPa antidetonation valve snail steel as claimed in claim 4, is characterized in that, high line heating, cooling controlling and rolling controlling process are: 65 ~ 100 minutes heating steel billet time, Heating temperature 1000 ~ 1200 DEG C, furnace pressure control≤5 handkerchiefs.
6. the working method of 500MPa antidetonation valve snail steel as claimed in claim 5, is characterized in that, take whole process temperature control to Rolling production, wherein: start rolling temperature controls at 1000 ~ 1100 DEG C; In roll control temperature at 950 DEG C-1020 DEG C; Finishing rolling control temperature is at 900 DEG C-980 DEG C; Wear water laying temperature after rolling to control at 870 DEG C-910 DEG C.
7. the working method of 500MPa antidetonation valve snail steel as claimed in claim 6, it is characterized in that, air-cooled line opens 2 Fans altogether, and wherein First opens 60%, middle wind turbine Close All, and last Fans opens 100%.
8. the working method of 500MPa antidetonation valve snail steel as claimed in claim 7, is characterized in that, air-cooled line roller-way travelling speed 0.42 ~ 0.80m/s.
9. the working method of 500MPa antidetonation valve snail steel as claimed in claim 8, it is characterized in that, stay-warm case has 40, and 1# ~ 18# insulation shroud is all opened, 19# ~ 26# insulation shroud Close All, 27# ~ 30# insulation shroud are opened, 31# ~ 32# insulation shroud is closed, 33# ~ 40# insulation shroud is all opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510975795.2A CN105483544A (en) | 2015-12-21 | 2015-12-21 | 500MPa anti-seismic coiled thread steel and processing method thereof |
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| CN201510975795.2A CN105483544A (en) | 2015-12-21 | 2015-12-21 | 500MPa anti-seismic coiled thread steel and processing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106319179A (en) * | 2016-08-31 | 2017-01-11 | 云南德胜钢铁有限公司 | Production technology for HRB400 coiled fine-grain reinforcing steel bar |
| CN110952021A (en) * | 2019-10-17 | 2020-04-03 | 包头钢铁（集团）有限责任公司 | Vanadium-nitrogen microalloyed HRB500E steel bar and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106319179A (en) * | 2016-08-31 | 2017-01-11 | 云南德胜钢铁有限公司 | Production technology for HRB400 coiled fine-grain reinforcing steel bar |
| CN110952021A (en) * | 2019-10-17 | 2020-04-03 | 包头钢铁（集团）有限责任公司 | Vanadium-nitrogen microalloyed HRB500E steel bar and production method thereof |
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Address after: 243003 Department of intellectual property right of Hunan West Road No. 8 technology center, Ma'anshan City, Anhui Province Applicant after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 Hunan Anhui West Road, No. 8 technology center, Intellectual Property Department Applicant before: Ma'anshan Iron and Steel Co., Ltd. |
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Application publication date: 20160413 |