CN104313471A - Prestressed reinforcement with low yield ratio, and heat treatment method therefor - Google Patents
Prestressed reinforcement with low yield ratio, and heat treatment method therefor Download PDFInfo
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- CN104313471A CN104313471A CN201410622567.2A CN201410622567A CN104313471A CN 104313471 A CN104313471 A CN 104313471A CN 201410622567 A CN201410622567 A CN 201410622567A CN 104313471 A CN104313471 A CN 104313471A
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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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
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
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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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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Abstract
The invention relates to a prestressed reinforcement with a low yield ratio. The reinforcement comprises components with the following weight percentages: 0.055 to 0.085 percent of C, 0.13 to 0.25 percent of Si, 2.20 to 2.50 percent of Mn, 0.010 percent or less of P, 0.0015 percent or less of S, 0.30 to 0.60 percent of Ni, 0.20 to 0.45 percent of Cu, 0.15 to 0.50 percent of Mo, 0.025 to 0.060 percent of Nb, 0.01 to 0.035 percent of Ti, 0.020 to 0.040 percent of Alt, 0.10 to 0.35 percent of composite rare earth, and the balance of Fe and unavoidable impurities. Through the reasonable component design, the low-carbon and low-phosphorous sulfur smelting technique, and the cooperation with other rare earth elements, the toughness of low alloy steel is effectively enhanced; through the controlled rolling and controlled cooling technology, and the reasonable tempering heat treatment, uniform textures and performances of the reinforcement are guaranteed, and the high-strength reinforcement with the low yield ratio for bridge projects is achieved.
Description
Technical field
The present invention relates to a kind of reinforcing bar and heat treating method thereof, specifically a kind of reinforcing bar and heat treating method thereof, belong to Metal smelting and technical field of heat treatment technology thereof.
Background technology
Abroad develop and employed high performance bridge steel kind.The U.S. adopts high performance bridge steel, has built many HPSs.This steel generally adopts quenched and tempered state to deliver goods, but impelling strength requires on the low side, and cost is high.Japan adopts high performance bridge steel, and this steel generally adopts TMCP+ tempering to deliver goods, and yield tensile ratio requires low.Some Domestic steel enterprise is developing high performance bridge steel kind, but trial product level in yield tensile ratio, low-temperature flexibility etc. still has some deficits at present.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, provides a kind of tension PC rod iron and heat treating method thereof, is designed and rational thermal treatment process, obtain the low yield strength ratio high-strength prestress reinforcing bar of excellent performance by reasonable component.
In order to solve above technical problem, the invention provides a kind of low yield strength ratio deformed bar, the composition that described reinforcing bar comprises and weight percentage thereof are: C:0.055 ~ 0.085%, Si:0.13 ~ 0.25%, Mn:2.20 ~ 2.50%, P :≤0.010%, S :≤0.0015%, Ni:0.30 ~ 0.60%, Cu:0.20 ~ 0.45%, Mo:0.15 ~ 0.50%, Nb:0.025 ~ 0.060%, Ti:0.01 ~ 0.035%, Alt:0.020 ~ 0.040%, compound rare-earth: 0.10 ~ 0.35%, all the other are Fe and inevitable impurity;
Impurity controls by weight percentage: O :≤0.0015%, N :≤0.0080%, H :≤0.0001%, As :≤0.012%, Pb :≤0.010%, Sn :≤0.010%, Sb :≤0.010%.
Further restriction technical scheme of the present invention, aforesaid low yield strength ratio deformed bar, in described compound rare-earth, comprises following component: Gd:8 ~ 16%, Sm:21 ~ 23%, Dy:1 ~ 2%, Pr:5 ~ 13% by weight percentage, and surplus is La.
Aforesaid low yield strength ratio deformed bar, described Steel Bar Tensile Strength is 820 ~ 850MPa, and yield strength is 560 ~ 650MPa, and unit elongation is >=20% ,-40 DEG C of low temperature impact of collision >=120J.
Aforesaid low yield strength ratio deformed bar, the composition that described reinforcing bar comprises and weight percentage thereof are: C:0.055%, Si:0.13%, Mn:2.20%, P:0.006%, S:0.0010%, Ni:0.30%, Cu:0.25%, Mo:0.15%, Nb:0.025%, Ti:0.01%, Alt:0.020%, compound rare-earth: 0.10%, all the other are Fe and inevitable impurity; Impurity controls by weight percentage: O :≤0.0015%, N :≤0.0080%, H :≤0.0001%, As :≤0.012%, Pb :≤0.010%, Sn :≤0.010%, Sb :≤0.010%;
In described compound rare-earth, comprise following component by weight percentage: Gd:8%, Sm:21%, Dy:1%, Pr:5%, surplus is La.
Aforesaid low yield strength ratio deformed bar, the composition that described reinforcing bar comprises and weight percentage thereof are: C:0.065%, Si:0.20%, Mn:2.31%, P:0.008%, S:0.0010%, Ni:0.46%, Cu:0.35%, Mo:0.35%, Nb:0.045%, Ti:0.015%, Alt:0.026%, compound rare-earth: 0.15%, all the other are Fe and inevitable impurity;
Impurity controls by weight percentage: O :≤0.0015%, N :≤0.0080%, H :≤0.0001%, As :≤0.012%, Pb :≤0.010%, Sn :≤0.010%, Sb :≤0.010%;
In described compound rare-earth, comprise following component by weight percentage: Gd:11%, Sm:22%, Dy:1%, Pr:8%, surplus is La.
Aforesaid low yield strength ratio deformed bar, the composition that described reinforcing bar comprises and weight percentage thereof are: C:0.085%, Si:0.25%, Mn:2.50%, P:0.010%, S:0.0015%, Ni:0.60%, Cu:0.45%, Mo:0.50%, Nb:0.060%, Ti:0.035%, Alt:0.040%, compound rare-earth: 0.35%, all the other are Fe and inevitable impurity;
Impurity controls by weight percentage: O :≤0.0015%, N :≤0.0080%, H :≤0.0001%, As :≤0.012%, Pb :≤0.010%, Sn :≤0.010%, Sb :≤0.010%;
In described compound rare-earth, comprise following component by weight percentage: Gd:16%, Sm:23%, Dy:2%, Pr:13%, surplus is La.
For a heat treating method for low yield strength ratio deformed bar, carry out according to the following steps:
(i) the reinforcing bar smelted is sent into process furnace and be heated to 1250-1295 DEG C, through the first refrigerating work procedure, reinforcing bar fast speed is cooled to 655-685 DEG C online, then in quenching device with water or hardening liquid carry out for time 22-26 quench second, then be heated to 870-880 DEG C of tempering through tempering process furnace, then be cooled to normal temperature by the second process for cooling;
(ii) reinforcing bar is hot-rolled down to desired size, hot-rolled temperature is 1120-1135 DEG C, through the 3rd refrigerating work procedure, reinforcing bar fast speed is cooled to 645-680 DEG C then online, then is cooled to normal temperature by the 4th process for cooling;
(iii) induction heating is carried out to the reinforcing bar after hot rolling, Heating temperature is 870-890 DEG C, the reinforcing bar completed by induction heating more directly carries out quench treatment with high pressure spray jetting or hardening liquid, quench cooling rate 11-14 DEG C/s without insulation, makes reinforcing bar temperature be cooled to the following 15-28 DEG C of Ms point;
(iv) the reinforcing bar after quenching is heated to 710-725 DEG C through tempering process furnace, is incubated 25-30 second;
(v) reinforcing bar fast speed is cooled to 355-385 DEG C through the 5th refrigerating work procedure by reinforcing bar after tempering online, is then heated to 750-790 DEG C through process furnace, adopt water-cooled with the rate of cooling of 8-10 DEG C/s by reinforcing bar water-cooled to normal temperature.
The heat treating method of aforesaid low yield strength ratio deformed bar, described first refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 6-10 DEG C/s by reinforcing bar water-cooled to 1120-1150 DEG C, then air cooling is to 750-770 DEG C, then adopt water-cooled with the rate of cooling of 1-3 DEG C/s by reinforcing bar water-cooled to 655-685 DEG C;
Described second refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 10-12 DEG C/s, reinforcing bar is chilled to room temperature;
Described 3rd refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 5-8 DEG C/s, reinforcing bar is chilled to 645-680 DEG C;
Described 4th refrigerating work procedure: adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 2-3 DEG C/s by reinforcing bar water-cooled to 520-550 DEG C, then air cooling is to 450-470 DEG C, then adopt water-cooled with the rate of cooling of 5-8 DEG C/s by reinforcing bar water-cooled to room temperature;
Described 5th refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 2-5 DEG C/s, reinforcing bar is chilled to 355-385 DEG C.
The present invention is bright to be designed by reasonable component, adopts low-carbon (LC), low-phosphorous sulphur smelting technology, coordinates, effectively enhance the toughness and tenacity of low alloy steel with other rare earth elements.Adopt Controlled Rolling And Controlled Cooling, and rational tempering heat treatment, ensure that reinforcing bar Microstructure and properties is even, obtain low yield strength ratio high strength bridge construction reinforcing bar.
Embodiment
embodiment 1
The light low yield strength ratio deformed bar of the one that the present embodiment provides, the composition that described reinforcing bar comprises and weight percentage thereof are: C:0.055%, Si:0.13%, Mn:2.20%, P:0.006%, S:0.0010%, Ni:0.30%, Cu:0.25%, Mo:0.15%, Nb:0.025%, Ti:0.01%, Alt:0.020%, compound rare-earth: 0.10%, all the other are Fe and inevitable impurity; Impurity controls by weight percentage: O :≤0.0015%, N :≤0.0080%, H :≤0.0001%, As :≤0.012%, Pb :≤0.010%, Sn :≤0.010%, Sb :≤0.010%; In described compound rare-earth, comprise following component by weight percentage: Gd:8%, Sm:21%, Dy:1%, Pr:5%, surplus is La.
The heat treating method of the low yield strength ratio deformed bar that the present embodiment is introduced, carries out according to the following steps:
(i) the reinforcing bar smelted is sent into process furnace and be heated to 1250 DEG C, online employing water-cooled is combined with air cooling, first adopt water-cooled with the rate of cooling of 6 DEG C/s by reinforcing bar water-cooled to 1120 DEG C, then air cooling to 750 DEG C, adopt water-cooled again with the rate of cooling of 1 DEG C/s by reinforcing bar water-cooled to 655 DEG C, then in quenching device with water or hardening liquid carry out for time 22 seconds quenching, then be heated to 870 DEG C of tempering through tempering process furnace, then with the rate of cooling of 10 DEG C/s, reinforcing bar be chilled to room temperature with pressurized air or vaporific hardening liquid;
(ii) reinforcing bar is hot-rolled down to desired size, hot-rolled temperature is 1120 DEG C, then adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 5 DEG C/s, reinforcing bar is chilled to 645 DEG C online, water-cooled is adopted to be combined with air cooling again, first adopt water-cooled with the rate of cooling of 2 DEG C/s by reinforcing bar water-cooled to 520 DEG C, then air cooling to 450 DEG C, then adopt water-cooled with the rate of cooling of 5 DEG C/s by reinforcing bar water-cooled to room temperature;
(iii) induction heating is carried out to the reinforcing bar after hot rolling, Heating temperature is 870 DEG C, the reinforcing bar completed by induction heating more directly carries out quench treatment with high pressure spray jetting or hardening liquid, quench cooling rate 11 DEG C/s without insulation, makes reinforcing bar temperature be cooled to following 15 DEG C of Ms point;
(iv) the reinforcing bar after quenching is heated to 710 DEG C through tempering process furnace, is incubated 25 seconds;
(v) adopted by the reinforcing bar after tempering pressurized air or vaporific hardening liquid, with the rate of cooling of 2 DEG C/s, reinforcing bar is chilled to 355 DEG C online, be then heated to 750 DEG C through process furnace, adopt water-cooled with the rate of cooling of 8 DEG C/s by reinforcing bar water-cooled to normal temperature.
Embodiment 2
The low yield strength ratio deformed bar that the present embodiment provides, the composition that described reinforcing bar comprises and weight percentage thereof are: C:0.065%, Si:0.20%, Mn:2.31%, P:0.008%, S:0.0010%, Ni:0.46%, Cu:0.35%, Mo:0.35%, Nb:0.045%, Ti:0.015%, Alt:0.026%, compound rare-earth: 0.15%, all the other are Fe and inevitable impurity;
Impurity controls by weight percentage: O :≤0.0015%, N :≤0.0080%, H :≤0.0001%, As :≤0.012%, Pb :≤0.010%, Sn :≤0.010%, Sb :≤0.010%;
In described compound rare-earth, comprise following component by weight percentage: Gd:11%, Sm:22%, Dy:1%, Pr:8%, surplus is La.
The heat treating method of the low yield strength ratio deformed bar that the present embodiment is introduced, carries out according to the following steps:
(i) the reinforcing bar smelted is sent into process furnace and be heated to 1265 DEG C, online employing water-cooled is combined with air cooling, first adopt water-cooled with the rate of cooling of 8 DEG C/s by reinforcing bar water-cooled to 1130 DEG C, then air cooling to 760 DEG C, adopt water-cooled again with the rate of cooling of 2 DEG C/s by reinforcing bar water-cooled to 665 DEG C, then in quenching device with water or hardening liquid carry out for time 24 seconds quenching, then be heated to 876 DEG C of tempering through tempering process furnace, then with the rate of cooling of 11 DEG C/s, reinforcing bar be chilled to room temperature with pressurized air or vaporific hardening liquid;
(ii) reinforcing bar is hot-rolled down to desired size, hot-rolled temperature is 1125 DEG C, then adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 6 DEG C/s, reinforcing bar is chilled to 660 DEG C online, water-cooled is adopted to be combined with air cooling again, first adopt water-cooled with the rate of cooling of 2 DEG C/s by reinforcing bar water-cooled to 535 DEG C, then air cooling to 465 DEG C, then adopt water-cooled with the rate of cooling of 7 DEG C/s by reinforcing bar water-cooled to room temperature;
(iii) induction heating is carried out to the reinforcing bar after hot rolling, Heating temperature is 885 DEG C, the reinforcing bar completed by induction heating more directly carries out quench treatment with high pressure spray jetting or hardening liquid, quench cooling rate 13 DEG C/s without insulation, makes reinforcing bar temperature be cooled to following 19 DEG C of Ms point;
(iv) the reinforcing bar after quenching is heated to 720 DEG C through tempering process furnace, is incubated 26 seconds;
(v) adopted by the reinforcing bar after tempering pressurized air or vaporific hardening liquid, with the rate of cooling of 4 DEG C/s, reinforcing bar is chilled to 365 DEG C online, be then heated to 770 DEG C through process furnace, adopt water-cooled with the rate of cooling of 8 DEG C/s by reinforcing bar water-cooled to normal temperature.
Embodiment 3
The low yield strength ratio deformed bar that the present embodiment provides, the composition that described reinforcing bar comprises and weight percentage thereof are: C:0.085%, Si:0.25%, Mn:2.50%, P:0.010%, S:0.0015%, Ni:0.60%, Cu:0.45%, Mo:0.50%, Nb:0.060%, Ti:0.035%, Alt:0.040%, compound rare-earth: 0.35%, all the other are Fe and inevitable impurity;
Impurity controls by weight percentage: O :≤0.0015%, N :≤0.0080%, H :≤0.0001%, As :≤0.012%, Pb :≤0.010%, Sn :≤0.010%, Sb :≤0.010%;
In described compound rare-earth, comprise following component by weight percentage: Gd:16%, Sm:23%, Dy:2%, Pr:13%, surplus is La.
The heat treating method of the low yield strength ratio deformed bar that the present embodiment is introduced, carries out according to the following steps:
(i) the reinforcing bar smelted is sent into process furnace and be heated to 1295 DEG C, online employing water-cooled is combined with air cooling, first adopt water-cooled with the rate of cooling of 10 DEG C/s by reinforcing bar water-cooled to 1150 DEG C, then air cooling to 770 DEG C, adopt water-cooled again with the rate of cooling of 3 DEG C/s by reinforcing bar water-cooled to 685 DEG C, then in quenching device with water or hardening liquid carry out for time 26 seconds quenching, then be heated to 880 DEG C of tempering through tempering process furnace, then with the rate of cooling of 12 DEG C/s, reinforcing bar be chilled to room temperature with pressurized air or vaporific hardening liquid;
(ii) reinforcing bar is hot-rolled down to desired size, hot-rolled temperature is 1135 DEG C, then adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 8 DEG C/s, reinforcing bar is chilled to 680 DEG C online, water-cooled is adopted to be combined with air cooling again, first adopt water-cooled with the rate of cooling of 3 DEG C/s by reinforcing bar water-cooled to 550 DEG C, then air cooling to 470 DEG C, then adopt water-cooled with the rate of cooling of 8 DEG C/s by reinforcing bar water-cooled to room temperature;
(iii) induction heating is carried out to the reinforcing bar after hot rolling, Heating temperature is 890 DEG C, the reinforcing bar completed by induction heating more directly carries out quench treatment with high pressure spray jetting or hardening liquid, quench cooling rate 14 DEG C/s without insulation, makes reinforcing bar temperature be cooled to following 28 DEG C of Ms point;
(iv) the reinforcing bar after quenching is heated to 725 DEG C through tempering process furnace, is incubated 30 seconds;
(v) adopted by the reinforcing bar after tempering pressurized air or vaporific hardening liquid, with the rate of cooling of 5 DEG C/s, reinforcing bar is chilled to 385 DEG C online, be then heated to 790 DEG C through process furnace, adopt water-cooled with the rate of cooling of 10 DEG C/s by reinforcing bar water-cooled to normal temperature.
After testing, the reinforcement property result of the embodiment of the present invention is good, Steel Bar Tensile Strength is 820 ~ 850MPa, yield strength is 560 ~ 650MPa, and unit elongation is >=20% ,-40 DEG C of low temperature impact of collision >=120J, there is good obdurability coupling and low yield tensile ratio, anti-seismic performance is excellent, and stable processing technique is workable.Its performance is as follows:
The tensile property of embodiment of the present invention tempering reinforcing bar
| Embodiment | Diameter/mm | Yield strength MPa | Tensile strength MPa | Unit elongation % |
| Embodiment 1 | 20 | 563 | 826 | 20.9 |
| Embodiment 2 | 20 | 586 | 831 | 21.2 |
| Embodiment 3 | 32 | 630 | 837 | 21.6 |
Table 5 embodiment of the present invention tempering reinforcing bar low-temperature flexibility
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (8)
1. a low yield strength ratio deformed bar, is characterized in that the composition that described reinforcing bar comprises and weight percentage thereof are: C:0.055 ~ 0.085%, Si:0.13 ~ 0.25%, Mn:2.20 ~ 2.50%, P :≤0.010%, S :≤0.0015%, Ni:0.30 ~ 0.60%, Cu:0.20 ~ 0.45%, Mo:0.15 ~ 0.50%, Nb:0.025 ~ 0.060%, Ti:0.01 ~ 0.035%, Alt:0.020 ~ 0.040%, compound rare-earth: 0.10 ~ 0.35%, all the other are Fe and inevitable impurity;
Impurity controls by weight percentage: O :≤0.0015%, N :≤0.0080%, H :≤0.0001%, As :≤0.012%, Pb :≤0.010%, Sn :≤0.010%, Sb :≤0.010%.
2. low yield strength ratio deformed bar according to claim 1, is characterized in that: in described compound rare-earth, comprises following component by weight percentage: Gd:8 ~ 16%, Sm:21 ~ 23%, Dy:1 ~ 2%, Pr:5 ~ 13%, surplus is La.
3. low yield strength ratio deformed bar according to claim 1, is characterized in that: described rod iron tensile strength is 820 ~ 850MPa, and yield strength is 560 ~ 650MPa, and unit elongation is >=20% ,-40 DEG C of low temperature impact of collision >=120J.
4. low yield strength ratio deformed bar according to claim 1, is characterized in that: the composition that described reinforcing bar comprises and weight percentage thereof are: C:0.055%, Si:0.13%, Mn:2.20%, P:0.006%, S:0.0010%, Ni:0.30%, Cu:0.25%, Mo:0.15%, Nb:0.025%, Ti:0.01%, Alt:0.020%, compound rare-earth: 0.10%, all the other are Fe and inevitable impurity;
Impurity controls by weight percentage: O :≤0.0015%, N :≤0.0080%, H :≤0.0001%, As :≤0.012%, Pb :≤0.010%, Sn :≤0.010%, Sb :≤0.010%;
In described compound rare-earth, comprise following component by weight percentage: Gd:8%, Sm:21%, Dy:1%, Pr:5%, surplus is La.
5. low yield strength ratio deformed bar according to claim 1, is characterized in that: the composition that described reinforcing bar comprises and weight percentage thereof are: C:0.065%, Si:0.20%, Mn:2.31%, P:0.008%, S:0.0010%, Ni:0.46%, Cu:0.35%, Mo:0.35%, Nb:0.045%, Ti:0.015%, Alt:0.026%, compound rare-earth: 0.15%, all the other are Fe and inevitable impurity;
Impurity controls by weight percentage: O :≤0.0015%, N :≤0.0080%, H :≤0.0001%, As :≤0.012%, Pb :≤0.010%, Sn :≤0.010%, Sb :≤0.010%;
In described compound rare-earth, comprise following component by weight percentage: Gd:11%, Sm:22%, Dy:1%, Pr:8%, surplus is La.
6. low yield strength ratio deformed bar according to claim 1, is characterized in that: the composition that described reinforcing bar comprises and weight percentage thereof are: C:0.085%, Si:0.25%, Mn:2.50%, P:0.010%, S:0.0015%, Ni:0.60%, Cu:0.45%, Mo:0.50%, Nb:0.060%, Ti:0.035%, Alt:0.040%, compound rare-earth: 0.35%, all the other are Fe and inevitable impurity;
Impurity controls by weight percentage: O :≤0.0015%, N :≤0.0080%, H :≤0.0001%, As :≤0.012%, Pb :≤0.010%, Sn :≤0.010%, Sb :≤0.010%;
In described compound rare-earth, comprise following component by weight percentage: Gd:16%, Sm:23%, Dy:2%, Pr:13%, surplus is La.
7. for a heat treating method for low yield strength ratio deformed bar according to claim 1, it is characterized in that: carry out according to the following steps:
(i) the reinforcing bar smelted is sent into process furnace and be heated to 1250-1295 DEG C, through the first refrigerating work procedure, reinforcing bar fast speed is cooled to 655-685 DEG C online, then in quenching device with water or hardening liquid carry out for time 22-26 quench second, then be heated to 870-880 DEG C of tempering through tempering process furnace, then be cooled to normal temperature by the second process for cooling;
(ii) reinforcing bar is hot-rolled down to desired size, hot-rolled temperature is 1120-1135 DEG C, through the 3rd refrigerating work procedure, reinforcing bar fast speed is cooled to 645-680 DEG C then online, then is cooled to normal temperature by the 4th process for cooling;
(iii) induction heating is carried out to the reinforcing bar after hot rolling, Heating temperature is 870-890 DEG C, the reinforcing bar completed by induction heating more directly carries out quench treatment with high pressure spray jetting or hardening liquid, quench cooling rate 11-14 DEG C/s without insulation, makes reinforcing bar temperature be cooled to the following 15-28 DEG C of Ms point;
(iv) the reinforcing bar after quenching is heated to 710-725 DEG C through tempering process furnace, is incubated 25-30 second;
(v) reinforcing bar fast speed is cooled to 355-385 DEG C through the 5th refrigerating work procedure by reinforcing bar after tempering online, is then heated to 750-790 DEG C through process furnace, adopt water-cooled with the rate of cooling of 8-10 DEG C/s by reinforcing bar water-cooled to normal temperature.
8. the heat treating method of low yield strength ratio deformed bar according to claim 7, is characterized in that:
Described first refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 6-10 DEG C/s by reinforcing bar water-cooled to 1120-1150 DEG C, then air cooling is to 750-770 DEG C, then adopt water-cooled with the rate of cooling of 1-3 DEG C/s by reinforcing bar water-cooled to 655-685 DEG C;
Described second refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 10-12 DEG C/s, reinforcing bar is chilled to room temperature;
Described 3rd refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 5-8 DEG C/s, reinforcing bar is chilled to 645-680 DEG C;
Described 4th refrigerating work procedure: adopt water-cooled be combined with air cooling, first employing water-cooled with the rate of cooling of 2-3 DEG C/s by reinforcing bar water-cooled to 520-550 DEG C, then air cooling is to 450-470 DEG C, then adopt water-cooled with the rate of cooling of 5-8 DEG C/s by reinforcing bar water-cooled to room temperature;
Described 5th refrigerating work procedure: adopt pressurized air or vaporific hardening liquid, with the rate of cooling of 2-5 DEG C/s, reinforcing bar is chilled to 355-385 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN106591725A (en) * | 2016-12-15 | 2017-04-26 | 苏州科胜仓储物流设备有限公司 | High-strength steel girder for goods shelf and manufacturing method of high-strength steel girder |
| CN106591702A (en) * | 2016-12-13 | 2017-04-26 | 苏州赛斯德工程设备有限公司 | High-strength stainless steel and heat treatment process thereof |
| CN106702264A (en) * | 2016-12-13 | 2017-05-24 | 苏州赛斯德工程设备有限公司 | High-strength duplex stainless steel and heat-treatment technology thereof |
| CN112080681A (en) * | 2020-09-07 | 2020-12-15 | 青岛仨保建筑材料有限公司 | Production process method of prestressed combined simply-supported beam steel bar for bridge construction |
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| CN102828117A (en) * | 2012-09-03 | 2012-12-19 | 南京钢铁股份有限公司 | Low-yield ratio high-intensity hot-rolled double-phase steel plate and production method thereof |
| CN103484780A (en) * | 2013-09-26 | 2014-01-01 | 江苏天舜金属材料集团有限公司 | High-strength hot-rolled reinforcement bar of 830 MPa level, and production technology thereof |
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| JPH0797626A (en) * | 1993-09-30 | 1995-04-11 | Nippon Steel Corp | Method for manufacturing high yield strength steel plate with low yield ratio by rapid tempering |
| CN101185938A (en) * | 2006-11-09 | 2008-05-28 | 钢铁研究总院 | Method for producing steel bar with rib |
| CN102828117A (en) * | 2012-09-03 | 2012-12-19 | 南京钢铁股份有限公司 | Low-yield ratio high-intensity hot-rolled double-phase steel plate and production method thereof |
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| CN106591702A (en) * | 2016-12-13 | 2017-04-26 | 苏州赛斯德工程设备有限公司 | High-strength stainless steel and heat treatment process thereof |
| CN106702264A (en) * | 2016-12-13 | 2017-05-24 | 苏州赛斯德工程设备有限公司 | High-strength duplex stainless steel and heat-treatment technology thereof |
| CN106591725A (en) * | 2016-12-15 | 2017-04-26 | 苏州科胜仓储物流设备有限公司 | High-strength steel girder for goods shelf and manufacturing method of high-strength steel girder |
| CN112080681A (en) * | 2020-09-07 | 2020-12-15 | 青岛仨保建筑材料有限公司 | Production process method of prestressed combined simply-supported beam steel bar for bridge construction |
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