CN103484780B - High-strength hot-rolled reinforcement bar of 830 MPa level, and production technology thereof - Google Patents
High-strength hot-rolled reinforcement bar of 830 MPa level, and production technology thereof Download PDFInfo
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Abstract
The invention relates to a reinforcement bar and a production technology thereof, in particular to a high-strength hot-rolled reinforcement bar of the 830 MPa level, and a production technology of the reinforcement bar. The reinforcement bar comprises the following chemical components by weight: 0.38 to 0.43% of C, 0.7 to 0.9% of Cr, 0.6 to 0.8% of Mn, 0.15 to 0.25% of Mo, 0.2 to 0.3% of Si, 1.6 to 2% of Ni, 0.035% of S, 0.035% of P, 0.035% of N and the balance of Fe. The shear strength of the reinforcement bar can reach 830 MPa; the reinforcement bar has the advantages of high strength, good ductility, high lagging and fracture resistance, economy of steel material, underrelaxation, easiness in welding, high upset performance and the like, can enable carbide to dissolve fully and diffuse uniformly, and avoids that intercrystalline corrosion and pitting exceeding are caused due to intercrystalline separation of carbide.
Description
Technical field
The present invention relates to a kind of reinforcing bar and production technique thereof, specifically a kind of 830MPa level high-strength hot-rolled steel bar and production technique thereof.
Background technology
Hot-rolled reinforced bar is through hot-roll forming and the finished product reinforcing bar of naturally cooling, suppressed at high operating temperatures by soft steel and common alloy steel and form, being mainly used in the arrangement of reinforcement of reinforced concrete and prestressed concrete structure, is one of rolling shapes that in civil construction project, usage quantity is maximum.Hot-rolled reinforced bar carries out classification according to yield strength standard value, is divided into level Four:
HPB235(Q235), the yield strength standard value 235MPa of this reinforcing bar, diameter 8 ~ 20mm, Young's modulus 210GPa.
HRB335(20MnSi), the yield strength standard value 335MPa of this reinforcing bar, diameter 6 ~ 50mm, Young's modulus 200GPa.
HRB400(20MnSiV, 20MnSiNb, 20MnTi), the yield strength standard value 400MPa of this reinforcing bar, diameter 6 ~ 50mm, Young's modulus 200GPa.
RRB400(K20MnSi), the yield strength standard value of this reinforcing bar is identical with HRB400 reinforcing bar is also 400MPa, diameter 8 ~ 40mm, Young's modulus 200GPa.
The yield strength of existing hot-rolled reinforced bar is all lower, hot-rolled reinforced bar yield strength is allowed to reach 830MPa and above so high intensity is very difficult thing, and intensity reaches so high, be difficult to guarantee and occur yield point elongation, so-called yield strength likely represents with the strain respective intensities of 0.2%.
Summary of the invention
Technical problem to be solved by this invention is, for the shortcoming that above prior art exists, a kind of 830MPa level high-strength hot-rolled steel bar and production technique thereof are proposed, yield strength can reach 830MPa, advantages such as having that intensity is high, ductility good, anti-delayed fracture resistance is strong, save steel, underrelaxation, easily welding, upsetting performance are good, and carbide can be made fully to dissolve, evenly spread, avoid carbide and cause intergranular corrosion and spot corrosion to exceed standard in the precipitation of intergranular.
The technical scheme that the present invention solves above technical problem is:
A kind of 830MPa level high-strength hot-rolled steel bar, its weight percent chemical composition is: C:0.38-0.43%, Cr:0.7-0.9%, Mn:0.6-0.8%, Mo:0.15-0.25%, Si:0.2-0.3%, Ni:1.6-2%, S:<0.035%, P:<0.035%, N:<0.035%, surplus is Fe.
The production technique of 830MPa level high-strength hot-rolled steel bar, carry out according to the following steps:
(i) the reinforcing bar smelted is sent into process furnace and be heated to 1000-1200 DEG C, then through online first refrigerating work procedure, reinforcing bar fast speed is cooled to 640-660 DEG C, then in quenching device with water or hardening liquid carry out for time 15-17 quench second, then be heated to 550-660 DEG C of tempering through tempering process furnace, then be cooled to normal temperature by the second process for cooling;
First refrigerating work procedure: adopt water-cooled with the rate of cooling of 9-11 DEG C/s by reinforcing bar water-cooled to 640-660 DEG C;
Second refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 1-2 DEG C/s by reinforcing bar water-cooled to 390-410 DEG C, then air cooling is to 260-280 DEG C, then adopt water-cooled with the rate of cooling of 3-5 DEG C/s by reinforcing bar water-cooled to 230-250 DEG C, last air cooling is to room temperature;
(ii) reinforcing bar is hot-rolled down to desired size, hot-rolled temperature is 1000-1200 DEG C, is cooled fast to 570-590 DEG C after hot rolling by pressurized air or vaporific hardening liquid;
(iii) the reinforcing bar completed by induction heating directly carries out quench treatment with high pressure spray jetting or hardening liquid, quench cooling rate 14-16 DEG C/s without insulation, makes reinforcing bar temperature be cooled to the following 10-30 DEG C of Ms point;
(iv) the reinforcing bar after quenching is heated to 590-610 DEG C through tempering process furnace, is incubated 13-15 second;
(v) by the reinforcing bar cool to room temperature after tempering.
The technical scheme that the present invention limits further is:
Aforesaid 830MPa level high-strength hot-rolled steel bar, its weight percent chemical composition is: C:0.38%, Cr:0.7%, Mn:0.6%, Mo:0.25%, Si:0.2%, Ni:1.6%, S:0.025%, P:0.03%, N:0.025%, and surplus is Fe.
Aforesaid 830MPa level high-strength hot-rolled steel bar, its weight percent chemical composition is: C:0.41%, Cr:0.8%, Mn:0.7%, Mo:0.15%, Si:0.25%, Ni:1.8%, S:0.015%, P:0.025%, N:0.015%, and surplus is Fe.
Aforesaid 830MPa level high-strength hot-rolled steel bar, its weight percent chemical composition is: C:0.43%, Cr:0.9%, Mn:0.8%, Mo:0.2%, Si:0.3%, Ni:2%, S:0.013%, P:0.015%, N:0.012%, and surplus is Fe.
The production technique of aforesaid 830MPa level high-strength hot-rolled steel bar, step (v) in, water-cooled is adopted to be combined with air cooling, first adopt water-cooled with the rate of cooling of 6-8 DEG C/s by reinforcing bar water-cooled to 370-390 DEG C, then air cooling is to 290-310 DEG C, adopt again water-cooled with the rate of cooling of 4-6 DEG C/s by reinforcing bar water-cooled to 190-210 DEG C, last air cooling is to room temperature.
The production technique of aforesaid 830MPa level high-strength hot-rolled steel bar, step (iii) in, high pressure spray jetting or hardening liquid are along being looped around reinforcing bar four equal portions longitudinal directions ejections, and pressure is more than or equal to 8Mpa.
The production technique of aforesaid 830MPa level high-strength hot-rolled steel bar, reinforcing bar passes through each operation of heating, cooling, Quench and temper successively under the affecting of front haulage transmission system, involve cooling by rear haulage transmission system again, the difference on the frequency of front and back traction drive is 0.5-1.5HZ.
The invention has the beneficial effects as follows:
Owing to adding Cr:0.7-0.9% in present component, Mn:0.6-0.8%, Mo:0.15-0.25%, Si:0.2-0.3%, Ni:1.6-2%, thus the atom active that can improve C and N element, the air mass that each atom is formed can form strong interaction with dislocation, pinning dislocation, produces yield point elongation, and making needs the external world to provide larger stress just can start dislocation.
In production technique of the present invention, through On-line accelerated cooling after the reinforcing bar smelted is heated, then quench, then tempering, then be cooled to normal temperature through the second process for cooling, by the setting of temperature and special process for cooling, carbide can be made fully to dissolve on the one hand, even diffusion, avoids carbide and causes intergranular corrosion and spot corrosion to exceed standard in the precipitation of intergranular, ensure that the ferrite content of material is greater than 30%; On the other hand, material solid solution can also be made abundant, avoid heat treatment mode and heat erosion rate that uneven solid solution inequality brings and to exceed standard and hardness exceeds standard, thus bring the breakthrough of another technical indicator, obtain beyond thought technique effect.
In production technique of the present invention, the reinforcing bar completed by induction heating is without insulation, rebar surface temperature is made to have little time release, austenite enters ferritic transformation processes shrink, form the ferrite that appropriate grain fineness number is superfine, make reinforcing bar ferrite content about 0.3%, the ferrite of grain refining not only can improve toughness and can also improve intensity, in addition, there is continuous modification with relieve stresses in the ferrite of about 30% when stretching.
Water-cooled is adopted to be combined with air cooling after tempering of the present invention, be followed successively by: water-cooled-air cooling-water-cooled-air cooling, like this, controlled by the cooling after tempering, carbide can be made fully to dissolve further, even diffusion, avoiding carbide causes intergranular corrosion and spot corrosion to exceed standard in the precipitation of intergranular, ensure that the ferrite content of material is about 30%, material solid solution can be made further abundant, avoid heat treatment mode heating uneven, the erosion rate that solid solution inequality is brought exceeds standard and hardness exceeds standard, and has consolidated the technique effect smelted postheat treatment technique above and produce.
Before and after steel of the present invention, the difference on the frequency of traction drive is 0.5-1.5HZ, setpoint frequency official post obtains product Q-tempering under certain tension, have that intensity is more than or equal to 830MPa, unit elongation is greater than more than 7%, anti-delayed fracture resistance be strong, the advantage of underrelaxation.
In a word, the present invention can make product yield strength reach 830MPa, uniform elongation is greater than more than 7.5%, the performance of the specification of quality that ensure that product and the anti-delayed fracture that improve reinforcing bar, be applied in prestressed concrete structure and can reduce amount of reinforcement more than 30%, greatly save reinforcing bar consumption, reduce the laid down cost of pile tube.In addition, the following advantage that reinforcing bar of the present invention also has: (1) ductility is good, higher than helix rib steel wire 30-50%; (2) strong flexor ratio is high, higher than helix rib steel wire 15-20%; (3) reduce ground tackle to become, reduce the link cost of 80%; (4) improve reinforcing bar and concrete bond stress and bonding force, increase prestressed transmission length, decrease prestressed lost force simultaneously; (6) improve the safety coefficient of at least 30%, wherein 15-20% improves generation by its ductility and strong flexor ratio.
Embodiment
embodiment 1
The 830MPa level high-strength hot-rolled steel bar of the present embodiment, its weight percent chemical composition is: C:0.38%, Cr:0.7%, Mn:0.6%, Mo:0.25%, Si:0.2%, Ni:1.6%, S:0.025%, P:0.03%, N:0.025%, and surplus is Fe.
The production technique of the 830MPa level high-strength hot-rolled steel bar of the present embodiment, carry out according to the following steps:
(i) the reinforcing bar smelted is sent into process furnace and be heated to 1200 DEG C, then through online first refrigerating work procedure, reinforcing bar fast speed is cooled to 640 DEG C, then in quenching device with water or hardening liquid carry out for time 15 seconds quenching, then be heated to 660 DEG C of tempering through tempering process furnace, then be cooled to normal temperature by the second process for cooling;
First refrigerating work procedure: adopt water-cooled with the rate of cooling of 9 DEG C/s by reinforcing bar water-cooled to 640 DEG C;
Second refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 1 DEG C/s by reinforcing bar water-cooled to 390 DEG C, then air cooling to 260 DEG C, then adopt water-cooled with the rate of cooling of 3 DEG C/s by reinforcing bar water-cooled to 230 DEG C, last air cooling is to room temperature;
(ii) reinforcing bar is hot-rolled down to desired size, hot-rolled temperature is 1170 DEG C, is cooled fast to 570 DEG C after hot rolling by pressurized air or vaporific hardening liquid;
(iii) the reinforcing bar completed by induction heating 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 10 DEG C of Ms point; High pressure spray jetting or hardening liquid are along being looped around reinforcing bar four equal portions longitudinal direction ejections, and pressure is more than or equal to 8Mpa.
(iv) the reinforcing bar after quenching is heated to 590 DEG C through tempering process furnace, is incubated 13 seconds;
(v) by the reinforcing bar cool to room temperature after tempering; Adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 6 DEG C/s by reinforcing bar water-cooled to 370 DEG C, then air cooling to 290 DEG C, then adopt water-cooled with the rate of cooling of 4 DEG C/s by reinforcing bar water-cooled to 190 DEG C, last air cooling is to room temperature.
In the present embodiment, reinforcing bar passes through each operation of heating, cooling, Quench and temper successively under the affecting of front haulage transmission system, then involves cooling by rear haulage transmission system, and the difference on the frequency of front and back traction drive is 0.5HZ.
embodiment 2
The 830MPa level high-strength hot-rolled steel bar of the present embodiment, its weight percent chemical composition is: C:0.41%, Cr:0.8%, Mn:0.7%, Mo:0.15%, Si:0.25%, Ni:1.8%, S:0.015%, P:0.025%, N:0.015%, and surplus is Fe.
The production technique of the 830MPa level high-strength hot-rolled steel bar of the present embodiment, carry out according to the following steps:
(i) the reinforcing bar smelted is sent into process furnace and be heated to 1100 DEG C, then through online first refrigerating work procedure, reinforcing bar fast speed is cooled to 650 DEG C, then in quenching device with water or hardening liquid carry out for time 16 seconds quenching, then be heated to 600 DEG C of tempering through tempering process furnace, then be cooled to normal temperature by the second process for cooling;
First refrigerating work procedure: adopt water-cooled with the rate of cooling of 10 DEG C/s by reinforcing bar water-cooled to 650 DEG C;
Second refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 2 DEG C/s by reinforcing bar water-cooled to 400 DEG C, then air cooling to 270 DEG C, then adopt water-cooled with the rate of cooling of 4 DEG C/s by reinforcing bar water-cooled to 240 DEG C, last air cooling is to room temperature;
(ii) reinforcing bar is hot-rolled down to desired size, hot-rolled temperature is 1110 DEG C, is cooled fast to 580 DEG C after hot rolling by pressurized air or vaporific hardening liquid;
(iii) the reinforcing bar completed by induction heating directly carries out quench treatment with high pressure spray jetting or hardening liquid, quench cooling rate 15 DEG C/s without insulation, makes reinforcing bar temperature be cooled to following 20 DEG C of Ms point; High pressure spray jetting or hardening liquid are along being looped around reinforcing bar four equal portions longitudinal direction ejections, and pressure is more than or equal to 8Mpa.
(iv) the reinforcing bar after quenching is heated to 600 DEG C through tempering process furnace, is incubated 14 seconds;
(v) by the reinforcing bar cool to room temperature after tempering; Adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 7 DEG C/s by reinforcing bar water-cooled to 380 DEG C, then air cooling to 300 DEG C, then adopt water-cooled with the rate of cooling of 5 DEG C/s by reinforcing bar water-cooled to 200 DEG C, last air cooling is to room temperature.
In the present embodiment, reinforcing bar passes through each operation of heating, cooling, Quench and temper successively under the affecting of front haulage transmission system, then involves cooling by rear haulage transmission system, and the difference on the frequency of front and back traction drive is 1.0HZ.
embodiment 3
The 830MPa level high-strength hot-rolled steel bar of the present embodiment, its weight percent chemical composition is: C:0.43%, Cr:0.9%, Mn:0.8%, Mo:0.2%, Si:0.3%, Ni:2%, S:0.013%, P:0.015%, N:0.012%, and surplus is Fe.
The production technique of the 830MPa level high-strength hot-rolled steel bar of the present embodiment, carry out according to the following steps:
(i) the reinforcing bar smelted is sent into process furnace and be heated to 1010 DEG C, then through online first refrigerating work procedure, reinforcing bar fast speed is cooled to 660 DEG C, then in quenching device with water or hardening liquid carry out for time 17 seconds quenching, then be heated to 520 DEG C of tempering through tempering process furnace, then be cooled to normal temperature by the second process for cooling;
First refrigerating work procedure: adopt water-cooled with the rate of cooling of 11 DEG C/s by reinforcing bar water-cooled to 660 DEG C;
Second refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 2 DEG C/s by reinforcing bar water-cooled to 410 DEG C, then air cooling to 280 DEG C, then adopt water-cooled with the rate of cooling of 5 DEG C/s by reinforcing bar water-cooled to 250 DEG C, last air cooling is to room temperature;
(ii) reinforcing bar is hot-rolled down to desired size, hot-rolled temperature is 1090 DEG C, is cooled fast to 590 DEG C after hot rolling by pressurized air or vaporific hardening liquid;
(iii) the reinforcing bar completed by induction heating directly carries out quench treatment with high pressure spray jetting or hardening liquid, quench cooling rate 16 DEG C/s without insulation, makes reinforcing bar temperature be cooled to following 30 DEG C of Ms point; High pressure spray jetting or hardening liquid are along being looped around reinforcing bar four equal portions longitudinal direction ejections, and pressure is more than or equal to 8Mpa.
(iv) the reinforcing bar after quenching is heated to 610 DEG C through tempering process furnace, is incubated 15 seconds;
(v) by the reinforcing bar cool to room temperature after tempering; Adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 8 DEG C/s by reinforcing bar water-cooled to 390 DEG C, then air cooling to 310 DEG C, then adopt water-cooled with the rate of cooling of 6 DEG C/s by reinforcing bar water-cooled to 210 DEG C, last air cooling is to room temperature.
In the present embodiment, reinforcing bar passes through each operation of heating, cooling, Quench and temper successively under the affecting of front haulage transmission system, then involves cooling by rear haulage transmission system, and the difference on the frequency of front and back traction drive is 1.5HZ.
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 (7)
1. the production technique of a 830MPa level high-strength hot-rolled steel bar, the weight percent chemical composition of this 830MPa level high-strength hot-rolled steel bar is: C:0.38-0.43%, Cr:0.7-0.9%, Mn:0.6-0.8%, Mo:0.15-0.25%, Si:0.2-0.3%, Ni:1.6-2%, S:<0.035%, P:<0.035%, N:<0.035%, surplus is Fe;
It is characterized in that: the production technique of this 830MPa level high-strength hot-rolled steel bar is carried out according to the following steps:
(i) the reinforcing bar smelted is sent into process furnace and be heated to 1000-1200 DEG C, then through online first refrigerating work procedure, reinforcing bar fast speed is cooled to 640-660 DEG C, then in quenching device with water or hardening liquid carry out for time 15-17 quench second, then be heated to 550-660 DEG C of tempering through tempering process furnace, then be cooled to normal temperature by the second process for cooling;
Described first refrigerating work procedure: adopt water-cooled with the rate of cooling of 9-11 DEG C/s by reinforcing bar water-cooled to 640-660 DEG C;
Described second refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 1-2 DEG C/s by reinforcing bar water-cooled to 390-410 DEG C, then air cooling is to 260-280 DEG C, then adopt water-cooled with the rate of cooling of 3-5 DEG C/s by reinforcing bar water-cooled to 230-250 DEG C, last air cooling is to room temperature;
(ii) reinforcing bar is hot-rolled down to desired size, hot-rolled temperature is 1000-1200 DEG C, is cooled fast to 570-590 DEG C after hot rolling by pressurized air or vaporific hardening liquid;
(iii) the reinforcing bar completed by induction heating directly carries out quench treatment with high pressure spray jetting or hardening liquid, quench cooling rate 14-16 DEG C/s without insulation, makes reinforcing bar temperature be cooled to the following 10-30 DEG C of Ms point;
(iv) the reinforcing bar after quenching is heated to 590-610 DEG C through tempering process furnace, is incubated 13-15 second;
(v) by the reinforcing bar cool to room temperature after tempering.
2. the production technique of 830MPa level high-strength hot-rolled steel bar as claimed in claim 1, it is characterized in that: the weight percent chemical composition of this 830MPa level high-strength hot-rolled steel bar is: C:0.38%, Cr:0.7%, Mn:0.6%, Mo:0.25%, Si:0.2%, Ni:1.6%, S:0.025%, P:0.03%, N:0.025%, surplus is Fe.
3. the production technique of 830MPa level high-strength hot-rolled steel bar as claimed in claim 1, it is characterized in that: the weight percent chemical composition of this 830MPa level high-strength hot-rolled steel bar is: C:0.41%, Cr:0.8%, Mn:0.7%, Mo:0.15%, Si:0.25%, Ni:1.8%, S:0.015%, P:0.025%, N:0.015%, surplus is Fe.
4. the production technique of 830MPa level high-strength hot-rolled steel bar as claimed in claim 1, it is characterized in that: the weight percent chemical composition of this 830MPa level high-strength hot-rolled steel bar is: C:0.43%, Cr:0.9%, Mn:0.8%, Mo:0.2%, Si:0.3%, Ni:2%, S:0.013%, P:0.015%, N:0.012%, surplus is Fe.
5. the production technique of 830MPa level high-strength hot-rolled steel bar as claimed in claim 1, it is characterized in that: described step (v) in, water-cooled is adopted to be combined with air cooling, first adopt water-cooled with the rate of cooling of 6-8 DEG C/s by reinforcing bar water-cooled to 370-390 DEG C, then air cooling is to 290-310 DEG C, adopt again water-cooled with the rate of cooling of 4-6 DEG C/s by reinforcing bar water-cooled to 190-210 DEG C, last air cooling is to room temperature.
6. the production technique of 830MPa level high-strength hot-rolled steel bar as claimed in claim 1, is characterized in that: described step (iii) in, high pressure spray jetting or hardening liquid are along being looped around reinforcing bar four equal portions longitudinal directions ejections, and pressure is more than or equal to 8Mpa.
7. the production technique of 830MPa level high-strength hot-rolled steel bar as claimed in claim 1, it is characterized in that: reinforcing bar passes through each operation of heating, cooling, Quench and temper successively under the affecting of front haulage transmission system, involve cooling by rear haulage transmission system again, the difference on the frequency of front and back traction drive is 0.5-1.5HZ.
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| CN104313471A (en) * | 2014-11-08 | 2015-01-28 | 江苏天舜金属材料集团有限公司 | Prestressed reinforcement with low yield ratio, and heat treatment method therefor |
| CN104313493A (en) * | 2014-11-08 | 2015-01-28 | 江苏天舜金属材料集团有限公司 | Steel for hydrogen corrosion-resistant high-speed railway prestressed pull rod and heat treatment method |
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| CN110408856A (en) * | 2019-09-09 | 2019-11-05 | 郑州煤机智能工作面科技有限公司 | A kind of founding materials and its casting method for coalcutter torque axis |
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Effective date of registration: 20190520 Address after: 212219 Changsheng Village, Baqiao Town, Yangzhong City, Zhenjiang City, Jiangsu Province Patentee after: Jiangsu forest building new material Limited by Share Ltd Address before: 212219 Second Bridge Industrial Zone, Baqiao Town, Yangzhong City, Zhenjiang City, Jiangsu Province Patentee before: Jiangsu Tianshun Metal Material Group Co., Ltd. |