CN103498104B - 630 MPa-grade high-strength hot-rolled reinforced bar and production process thereof - Google Patents
630 MPa-grade high-strength hot-rolled reinforced bar and production process thereof Download PDFInfo
- Publication number
- CN103498104B CN103498104B CN201310444163.4A CN201310444163A CN103498104B CN 103498104 B CN103498104 B CN 103498104B CN 201310444163 A CN201310444163 A CN 201310444163A CN 103498104 B CN103498104 B CN 103498104B
- Authority
- CN
- China
- Prior art keywords
- cooled
- reinforcing bar
- cooling
- water
- strength hot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- 239000000126 substance Substances 0.000 claims abstract description 12
- 230000003014 reinforcing effect Effects 0.000 claims description 84
- 238000001816 cooling Methods 0.000 claims description 82
- 238000000034 method Methods 0.000 claims description 55
- 238000010791 quenching Methods 0.000 claims description 31
- 238000005496 tempering Methods 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 13
- 230000000171 quenching effect Effects 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 6
- 238000005098 hot rolling Methods 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000005260 corrosion Methods 0.000 abstract description 8
- 230000007797 corrosion Effects 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000001556 precipitation Methods 0.000 abstract description 4
- 238000003466 welding Methods 0.000 abstract description 2
- 150000001247 metal acetylides Chemical class 0.000 abstract 2
- 229910000859 α-Fe Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 239000006104 solid solution Substances 0.000 description 4
- 239000004567 concrete Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to a reinforced bar and a production process thereof, and specifically relates to a 630 MPa-grade high-strength hot-rolled reinforced bar and a production process thereof. The 630 MPa-grade high-strength hot-rolled reinforced bar comprises the following chemical components in percentage by weight: 0.38%-0.43% of C, 0.8%-1.1% of Cr, 0.75%-1.0% of Mn, 0.15%-0.25% of Mo, 0.15%-0.3% of Si, less than 0.035% of S, less than 0.035% of P, less than 0.035% of Na and the balance of Fe. The yield strength of the reinforced bar disclosed by the invention can reach 630 Mpa, has the advantages of high strength, good ductility, strong anti-lagging breakage, steel saving, low relaxation, welding easiness, good upsetting performance and the like; carbides can be sufficiently dissolve and uniformly diffuse, thereby avoiding intercrystalline corrosion and overhigh point corrosion due to intercrystalline precipitation of carbides.
Description
Technical field
The present invention relates to a kind of reinforcing bar and production technique thereof, specifically a kind of 630MPa 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 630Mpa 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 630MPa level high-strength hot-rolled steel bar and production technique thereof are proposed, yield strength can reach 630Mpa, 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 630MPa level high-strength hot-rolled steel bar, its weight percent chemical composition is: C:0.38-0.43%, Cr:0.8-1.1%, Mn:0.75-1.0%, Mo:0.15-0.25%, Si:0.15-0.3%, S:<0.035%, P:<0.035%, N:<0.035%, surplus is Fe.
The production technique of 630MPa 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 610-630 DEG C, then in quenching device with water or hardening liquid carry out for time 12-14 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 15-17 DEG C/s by reinforcing bar water-cooled to 610-630 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 320-350 DEG C, then air cooling is to 250-280 DEG C, then adopt water-cooled with the rate of cooling of 3-5 DEG C/s by reinforcing bar water-cooled to 210-230 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 600-630 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 20-23 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 520-540 DEG C through tempering process furnace, is incubated 15-18 second;
(v) by the reinforcing bar cool to room temperature after tempering.
The technical scheme that the present invention limits further is:
Aforesaid 630MPa level high-strength hot-rolled steel bar, its weight percent chemical composition is: C:0.38%, Cr:1.1%, Mn:0.75%, Mo:0.25%, Si:0.21%, S:0.025%, P:0.03%, N:0.025%, and surplus is Fe.
Aforesaid 630MPa level high-strength hot-rolled steel bar, its weight percent chemical composition is: C:0.41%, Cr:0.8%, Mn:1.0%, Mo:0.15%, Si:0.15%, S:0.015%, P:0.025%, N:0.015%, and surplus is Fe.
Aforesaid 630MPa level high-strength hot-rolled steel bar, its weight percent chemical composition is: C:0.43%, Cr:0.9%, Mn:0.85%, Mo:0.2%, Si:0.3%, S:0.013%, P:0.015%, N:0.012%, and surplus is Fe.
The production technique of aforesaid 630MPa 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 3-5 DEG C/s by reinforcing bar water-cooled to 330-350 DEG C, then air cooling is to 260-280 DEG C, adopt again water-cooled with the rate of cooling of 1-3 DEG C/s by reinforcing bar water-cooled to 210-230 DEG C, last air cooling is to room temperature.
The production technique of aforesaid 630MPa 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 630MPa 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:0.8-1.1% in present component, Mn:0.75-1.0%, Mo:0.15-0.25%, thus the atom active of C and N element can be improved, 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, by the reinforcing bar that heated 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 30%, 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, and setpoint frequency official post obtains product Q-tempering under certain tension, has that intensity is greater than 630MPa, unit elongation is greater than more than 7%, and anti-delayed fracture resistance is strong, the advantage of underrelaxation.
In a word, the present invention can make product yield strength reach 630MPa, 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 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 cost, 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 630MPa level high-strength hot-rolled steel bar of the present embodiment, its weight percent chemical composition is: C:0.38%, Cr:1.1%, Mn:0.75%, Mo:0.25%, Si:0.21%, S:0.025%, P:0.03%, N:0.025%, and surplus is Fe.
The production technique of the 630MPa 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 610 DEG C, then in quenching device with water or hardening liquid carry out for time 12 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 15 DEG C/s by reinforcing bar water-cooled to 610 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 320 DEG C, then air cooling to 250 DEG C, then adopt water-cooled with the rate of cooling of 3 DEG C/s by reinforcing bar water-cooled to 210 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 600 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 20 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 520 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 3 DEG C/s by reinforcing bar water-cooled to 330 DEG C, then air cooling to 260 DEG C, then adopt water-cooled with the rate of cooling of 1 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 0.5HZ.
embodiment 2
The 630MPa level high-strength hot-rolled steel bar of the present embodiment, its weight percent chemical composition is: C:0.41%, Cr:0.8%, Mn:1.0%, Mo:0.15%, Si:0.15%, S:0.015%, P:0.025%, N:0.015%, and surplus is Fe.
The production technique of the 630MPa 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 620 DEG C, then in quenching device with water or hardening liquid carry out for time 13 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 16 DEG C/s by reinforcing bar water-cooled to 620 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 340 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 220 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 620 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 22 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 530 DEG C through tempering process furnace, is incubated 17 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 4 DEG C/s by reinforcing bar water-cooled to 340 DEG C, then air cooling to 270 DEG C, then adopt water-cooled with the rate of cooling of 2 DEG C/s by reinforcing bar water-cooled to 220 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 630MPa level high-strength hot-rolled steel bar of the present embodiment, its weight percent chemical composition is: C:0.43%, Cr:0.9%, Mn:0.85%, Mo:0.2%, Si:0.3%, S:0.013%, P:0.015%, N:0.012%, and surplus is Fe.
The production technique of the 630MPa 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 630 DEG C, then in quenching device with water or hardening liquid carry out for time 14 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 17 DEG C/s by reinforcing bar water-cooled to 630 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 350 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 230 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 630 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 23 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 540 DEG C through tempering process furnace, is incubated 18 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 5 DEG C/s by reinforcing bar water-cooled to 350 DEG C, then air cooling to 280 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.
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. a 630MPa level high-strength hot-rolled steel bar, its weight percent chemical composition is: C:0.38-0.43%, Cr:0.8-1.1%, Mn:0.75-1.0%, Mo:0.15-0.25%, Si:0.15-0.3%, S:<0.035%, P:<0.035%, N:<0.035%, surplus is Fe; It is characterized in that:
The production technique of described 630MPa 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 610-630 DEG C, then in quenching device with water or hardening liquid carry out for time 12-14 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 15-17 DEG C/s by reinforcing bar water-cooled to 610-630 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 320-350 DEG C, then air cooling is to 250-280 DEG C, then adopt water-cooled with the rate of cooling of 3-5 DEG C/s by reinforcing bar water-cooled to 210-230 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 600-630 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 20-23 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 520-540 DEG C through tempering process furnace, is incubated 15-18 second;
(v) by the reinforcing bar cool to room temperature after tempering.
2. 630MPa level high-strength hot-rolled steel bar as claimed in claim 1, is characterized in that: its weight percent chemical composition is: C:0.38%, Cr:1.1%, Mn:0.75%, Mo:0.25%, Si:0.21%, S:0.025%, P:0.03%, N:0.025%, surplus is Fe.
3. 630MPa level high-strength hot-rolled steel bar as claimed in claim 1, is characterized in that: its weight percent chemical composition is: C:0.41%, Cr:0.8%, Mn:1.0%, Mo:0.15%, Si:0.15%, S:0.015%, P:0.025%, N:0.015%, surplus is Fe.
4. 630MPa level high-strength hot-rolled steel bar as claimed in claim 1, is characterized in that: its weight percent chemical composition is: C:0.43%, Cr:0.9%, Mn:0.85%, Mo:0.2%, Si:0.3%, S:0.013%, P:0.015%, N:0.012%, surplus is Fe.
5. 630MPa 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 3-5 DEG C/s by reinforcing bar water-cooled to 330-350 DEG C, then air cooling is to 260-280 DEG C, adopt again water-cooled with the rate of cooling of 1-3 DEG C/s by reinforcing bar water-cooled to 210-230 DEG C, last air cooling is to room temperature.
6. the 630MPa level high-strength hot-rolled steel bar as described in claim 1 or 5, 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 630MPa level high-strength hot-rolled steel bar as described in claim 1 or 5, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310444163.4A CN103498104B (en) | 2013-09-26 | 2013-09-26 | 630 MPa-grade high-strength hot-rolled reinforced bar and production process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310444163.4A CN103498104B (en) | 2013-09-26 | 2013-09-26 | 630 MPa-grade high-strength hot-rolled reinforced bar and production process thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103498104A CN103498104A (en) | 2014-01-08 |
| CN103498104B true CN103498104B (en) | 2015-06-24 |
Family
ID=49863361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310444163.4A Active CN103498104B (en) | 2013-09-26 | 2013-09-26 | 630 MPa-grade high-strength hot-rolled reinforced bar and production process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103498104B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104328352B (en) * | 2014-11-07 | 2017-03-01 | 刘诗琦 | A kind of high-strength prestressed steel wire and its heat treatment method |
| CN107866519A (en) * | 2017-11-14 | 2018-04-03 | 朱建海 | A kind of production technology of corrosion-resistant bronze valve |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102517500A (en) * | 2011-12-16 | 2012-06-27 | 内蒙古包钢钢联股份有限公司 | Rolling process for producing 35CrMo alloy cold forging steel through adopting small billets |
| CN102644036A (en) * | 2012-04-28 | 2012-08-22 | 江苏天舜金属材料集团有限公司 | High-strength reinforcing steel bar with spiral fins and processing method of high-strength reinforcing steel bar |
| CN103038382A (en) * | 2010-06-28 | 2013-04-10 | 现代制铁株式会社 | Ultra-high-strength steel bar and method for manufacturing same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000212691A (en) * | 1999-01-20 | 2000-08-02 | Kawasaki Steel Corp | Steel wire rod for cold forging and method for producing the same |
| KR100959475B1 (en) * | 2007-10-29 | 2010-05-26 | 현대제철 주식회사 | Manufacturing method of super high strength steel |
| KR100987347B1 (en) * | 2008-06-23 | 2010-10-12 | 동국제강주식회사 | Manufacturing method of high strength resistive steel |
-
2013
- 2013-09-26 CN CN201310444163.4A patent/CN103498104B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103038382A (en) * | 2010-06-28 | 2013-04-10 | 现代制铁株式会社 | Ultra-high-strength steel bar and method for manufacturing same |
| CN102517500A (en) * | 2011-12-16 | 2012-06-27 | 内蒙古包钢钢联股份有限公司 | Rolling process for producing 35CrMo alloy cold forging steel through adopting small billets |
| CN102644036A (en) * | 2012-04-28 | 2012-08-22 | 江苏天舜金属材料集团有限公司 | High-strength reinforcing steel bar with spiral fins and processing method of high-strength reinforcing steel bar |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103498104A (en) | 2014-01-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103484789B (en) | A kind of high strength prestressed the reinforcement of concrete rod iron of high ductility and working method thereof | |
| CN103276312B (en) | High-strength steel plate having extra thickness of 80-120mm and method for producing same from continuous casting billet | |
| CN102181797B (en) | Method for processing steel strand for prestressed concrete | |
| CN103484780B (en) | High-strength hot-rolled reinforcement bar of 830 MPa level, and production technology thereof | |
| CN105506494A (en) | High-toughness hot-rolled high-strength steel with yield strength being 800 MPa and manufacturing method of high-toughness hot-rolled high-strength steel | |
| CN103225047B (en) | The X80 pipeline steel of thickness >=26.5mm and production method thereof | |
| CN102418037B (en) | Hot-rolled H-section steel with lamellar tearing resistance and manufacturing method thereof | |
| CN103643143B (en) | A kind of 600MPa level Green heat treatment high strength cast iron and working method thereof | |
| CN101603119A (en) | Make the method for high-intensity high-tenacity steel plate with hot-rolled coil | |
| CN101117683A (en) | High-performance hydrogen sulfide corrosion resistant oil drill rocker and its heat treatment process | |
| CN101985725A (en) | 780MPa grade low yield ratio steel plate for buildings and manufacturing method thereof | |
| CN110885952A (en) | 400MPa grade hot-rolled ribbed steel bar and preparation method thereof | |
| CN101429619B (en) | High-strength steel tie rod and its heat treatment method | |
| CN103205651A (en) | On-line quenching production method of low-cost high-strength abrasion-resistant steel plate | |
| CN102352462A (en) | Anchor rod rebar with high strength and high impact toughness and preparation method thereof | |
| CN102061370A (en) | Production process of rebar for concrete | |
| CN102181798A (en) | Processing method of high yield ratio and high plasticity steel product for prestressed concrete | |
| CN107419165A (en) | A kind of 1080MPa levels bainite finish rolling reinforcing bar and its production method | |
| CN101538677A (en) | HRB500E fine grain anti-seismic steel bar and production method thereof | |
| CN102181794A (en) | Hardening and tempering high-strength steel plate for wood based panel equipment and production method of tempering high-strength steel plate | |
| CN103215519A (en) | Main steam pipeline for supercritical thermal power generating unit | |
| CN103484775B (en) | High-strength hot-rolled reinforcement bar of 730 MPa level, and production technology thereof | |
| CN104404390A (en) | High-strength and high-plasticity bolting steel for supporting in coal mines and manufacturing method thereof | |
| CN101418418B (en) | Low welding crack sensitivity steel plate with yield strength of 690MPa grade and method for producing the same | |
| CN103498104B (en) | 630 MPa-grade high-strength hot-rolled reinforced bar and production process thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
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. |