CN102876983A - Production process for 82B wire rod used for high strength prestressed steel wire and wire rod thereof - Google Patents
Production process for 82B wire rod used for high strength prestressed steel wire and wire rod thereof Download PDFInfo
- Publication number
- CN102876983A CN102876983A CN2012103725189A CN201210372518A CN102876983A CN 102876983 A CN102876983 A CN 102876983A CN 2012103725189 A CN2012103725189 A CN 2012103725189A CN 201210372518 A CN201210372518 A CN 201210372518A CN 102876983 A CN102876983 A CN 102876983A
- Authority
- CN
- China
- Prior art keywords
- wire rod
- prestressed steel
- temperature
- wire
- strength prestressed
- 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.)
- Granted
Links
Images
Landscapes
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to a production process for an 82B wire rod used for a high strength prestressed steel wire and a wire rod thereof. The production process achieves objects of refining grains, improving the metallographic structure and obtaining high sorbite rate, improves strength and plasticity of the 82B wire rod used for the high strength prestressed steel wire and realizes an object of optimizing a metallographic structure and mechanical properties of the 82B wire rod used for the high strength prestressed steel wire, by optimally designing chemical components of the 82B wire rod used for the high strength prestressed steel wire, adjusting heating procedures of a heating furnace before rolling, and employing controlled rolling and controlled cooling techniques. The high power quality and mechanical properties of the 82B wire rod with a nominal diameter of 6.5 mm used for the high strength prestressed steel wire reach the national standard of the hot rolling wire rod used for the prestressed steel wire and steel strand, and meet production requirement of downstream users.
Description
Technical field
The invention belongs to field of metallurgy, relate to a kind of production technique of wire rod, more particularly, relate to a kind of high-strength prestressed steel wire with the production technique of 82B wire rod and the wire rod that obtains according to this production technique.
Background technology
High-strength prestressed steel wire is high, the with high content of technology product of intensity rank in the Constructional Steel, is widely used in large high-speed railway, highway, bridge, roof truss, crane girder, Highrise buildings, tie industry etc.Because the singularity of compressor wire working conditions and Working environment has 3 basic demands to its quality, namely material is even, and poker characteristic is good; With a collection of product must intensity on a rank.Correspondingly also require production preload tension wire material products good with purity of steel height, homogeneous chemical composition, the surface quality of wire rod, organize the sorbite rate high and evenly; Stable performance.And intensity is higher, and is higher to the requirement of steel, metallographic structure and the surface quality etc. of used wire rod.High-carbon steel wire rod is the preferred raw materials of producing compressor wire, is characterized in high-carbon, high strength, and requires that good combination of strength and toughness is arranged, to satisfy the user to the needs of steel cold drawing performance.
China's compressor wire is that sorbitic rate is not high and inhomogeneous, mechanical property is not high with the subject matter of gren rod at present, and this is the principal element of restriction China compressor wire development.Therefore, the exploitation high-strength prestressed steel wire becomes one of emphasis of wire rod research and development with gren rod.
Summary of the invention
For the deficiencies in the prior art, one of purpose of the present invention is to solve the one or more problems that exist in the above-mentioned prior art.
The object of the present invention is to provide a kind of can crystal grain thinning, improve metallographic structure, obtain high sorbite rate with reach improve high-strength prestressed steel wire with the mechanical property such as the intensity of 82B wire rod and plasticity and the high-strength prestressed steel wire of purpose of optimizing its metallographic structure with the production technique of 82B wire rod and according to wire rod that this production technique was obtained.
To achieve these goals, an aspect of of the present present invention provides the production technique of a kind of high-strength prestressed steel wire with the 82B wire rod, described production technique comprises following operation: raw material is prepared, smelting molten steel, continuous casting becomes base, add hot continuously cast material, temperature-controlled rolling becomes wire rod, the rolling of weaving silk, the control cooling, aftertreatment also obtains the wire rod finished product, wherein, by weight percentage, described wire rod finished product comprises following chemical ingredients: C:0.80～0.85%, Si:0.15～0.30%, Mn:0.70～0.90%, P≤0.025%, S≤0.025%, Cr:0.15～0.30%, Ni≤0.10%, Cu≤0.05%, V:0.02～0.05%, Als≤0.02%, and the Fe of surplus and inevitable impurity; In the described step that adds hot continuously cast material, control preheating section temperature is that 700～760 ℃, warm up time are 35～50 minutes, the heating zone temperature is that 960～1000 ℃, heat-up time are 35～50 minutes, the soaking zone temperature is that 990～1030 ℃, soaking time are 30～40min, and the control furnace atmosphere is weak reducing atmosphere; Become in the step of wire rod at described temperature-controlled rolling, the control start rolling temperature is 950～990 ℃; In the step of the described rolling of weaving silk, the control laying temperature is 860～880 ℃; In the step of described control cooling, the rear control of rolling of adopting stelmor control cold line to coil is cooled off, the cooling rate that controlling board twists in before the pearlitic transformation is 9.5～10.5 ℃/s, the pearlitic transformation temperature is controlled at 640～690 ℃, cooling rate is 1.5～2.5 ℃/s after the phase transformation, makes the wire rod surface temperature that cooling is rear, aftertreatment is front be less than or equal to 300 ℃.
Use an embodiment of the production technique of 82B wire rod according to high-strength prestressed steel wire according to the present invention, described temperature-controlled rolling becomes the step of wire rod to comprise to make continuously cast bloom to form successively the step of wire rod by roughing unit, intermediate mill, pre-finishing mill group, pre-finishing mill group, finishing train and reducing sizing mill group, wherein, the temperature that the control wire rod enters the finishing train entrance is 850～880 ℃, and the temperature that the control wire rod enters reducing sizing mill group entrance is 850～880 ℃.
High-strength prestressed steel wire according to the present invention by weight percentage, contains 0.20～0.24% Cr, 0.020～0.025% V with an embodiment of the production technique of 82B wire rod in the described wire rod finished product.
According to a high-strength prestressed steel wire according to the present invention embodiment with the production technique of 82B wire rod, the nominal diameter of described wire rod finished product is 6.5mm.
High-strength prestressed steel wire according to the present invention is not more than 1.5% of wire rod finished product nominal diameter with an embodiment of the production technique of 82B wire rod, the local total decarburized layer degree of depth in one side of described wire rod finished product.
High-strength prestressed steel wire according to the present invention is mainly nodular troostite with an embodiment of the production technique of 82B wire rod in the metallographic structure of described wire rod finished product, and sorbitic content is no less than 90%.
According to a high-strength prestressed steel wire according to the present invention embodiment with the production technique of 82B wire rod, the real tensile strength R of described wire rod finished product
m〉=1200MPa, elongation A 〉=11%, relative reduction in area Z 〉=30%.
Another aspect of the present invention provides a kind of high-strength prestressed steel wire 82B wire rod, and described wire rod is made with the production technique of 82B wire rod according to above-mentioned high-strength prestressed steel wire.
The present invention compared with prior art, use the equipment advantage of high line unit, by process furnace heating cycle, employing controlled rolling, the control cooling technology before rolling with optimization of Chemical Composition design, the adjustment of 82B wire rod to high-strength prestressed steel wire, crystal grain thinning, improve metallographic structure, obtain high sorbite rate, improved intensity and the plasticity of high-strength prestressed steel wire with the 82B wire rod, reached and optimize the high-strength prestressed steel wire metallographic structure of 82B wire rod, the purpose of mechanical property.
Description of drawings
Fig. 1 is the micro test metallographic structure synoptic diagram that high-strength prestressed steel wire is used the sample one of 82B wire rod in the embodiment of the invention.
Fig. 2 is the micro test metallographic structure synoptic diagram that high-strength prestressed steel wire is used the sample two of 82B wire rod in the embodiment of the invention.
Fig. 3 is the micro test metallographic structure synoptic diagram that high-strength prestressed steel wire is used the sample three of 82B wire rod in the embodiment of the invention.
Embodiment
Hereinafter, describe high-strength prestressed steel wire of the present invention in detail with the production technique of 82B wire rod and the wire rod that obtains according to this production technique in connection with exemplary embodiment.Wherein, unless otherwise noted, related per-cent all is weight percentage.
According to high-strength prestressed steel wire according to the present invention exemplary embodiment with the production technique of 82B wire rod, described production technique comprises following operation: raw material preparation, smelting molten steel, continuous casting become base, add hot continuously cast material, temperature-controlled rolling becomes wire rod, the rolling of weaving silk, control cooling, aftertreatment and obtain the wire rod finished product.Wherein, by weight percentage, described wire rod finished product comprises following chemical ingredients: C:0.80～0.85%, Si:0.15～0.30%, Mn:0.70～0.90%, P≤0.025%, S≤0.025%, Cr:0.15～0.30%, Ni≤0.10%, Cu≤0.05%, V:0.02～0.05%, Als≤0.02%, and the Fe of surplus and inevitable impurity; In the described step that adds hot continuously cast material, control preheating section temperature is that 700～760 ℃, warm up time are 35～50 minutes, the heating zone temperature is that 960～1000 ℃, heat-up time are 35～50 minutes, the soaking zone temperature is that 990～1030 ℃, soaking time are 30～40min, and the control furnace atmosphere is weak reducing atmosphere; Become in the step of wire rod at described temperature-controlled rolling, the control start rolling temperature is 950～990 ℃; In the step of the described rolling of weaving silk, the control laying temperature is 860～880 ℃; In the step of described control cooling, the rear control of rolling of adopting stelmor control cold line to coil is cooled off, the cooling rate that controlling board twists in before the pearlitic transformation is 9.5～10.5 ℃/s, the pearlitic transformation temperature is controlled at 640～690 ℃, cooling rate is 1.5～2.5 ℃/s after the phase transformation, makes the wire rod surface temperature that cooling is rear, aftertreatment is front be less than or equal to 300 ℃.
In the present embodiment, by improvement such as the process furnace heating cycle before rolling with optimization of Chemical Composition design, the adjustment of 82B wire rod to high-strength prestressed steel wire, employing controlled rolling, control cooling technologies, effectively reach crystal grain thinning, improve metallographic structure, obtain the purpose of high sorbite rate, improved the mechanical property of high-strength prestressed steel wire with the 82B wire rod.
According to the present invention, by weight percentage, the wire rod finished product comprises following chemical ingredients: C:0.80～0.85%, Si:0.15～0.30%, Mn:0.70～0.90%, P≤0.025%, S≤0.025%, Cr:0.15～0.30%, Ni≤0.10%, Cu≤0.05%, V:0.02～0.05%, Als≤0.02%, and the Fe of surplus and inevitable impurity.Because high-strength prestressed steel wire belongs to hypereutectoid steel with the 82B wire rod, if need not reduce plasticity in the intensity of raising hypereutectoid steel, to adjust rolling technology be the most effective solution up to now again by adding an amount of micro alloying element.To studies show that of microalloy element: Cr unit have the effect that reduces the Cooling Austenite Transformation temperature, and the pearlite interlaminar spacing that can reduce hypereutectoid steel improves the intensity of steel, reduces γ → Fe
3The velocity of transformation of C and alleviating suppresses that the drawing property of steel is separated out, improved to proeutectoid cementite, crystal grain thinning improves plasticity; V element has the effect of crystal grain thinning, and trace V (＜0.1%) element can improve intensity and the plasticity of high carbon steel.Therefore, the present invention carries out microalloying by adding trace alloying element Cr and V, reaches the purpose of Optimal performance.Preferably, contain 0.20～0.24% Cr, 0.020～0.025% V in the wire rod finished product.
According to the present invention, in adding the step of hot continuously cast material, control preheating section temperature is that 700～760 ℃, warm up time are 35～50 minutes, the heating zone temperature is that 960～990 ℃, heat-up time are 35～50 minutes, the soaking zone temperature is that 990～1030 ℃, soaking time are 30～40min, and the control furnace atmosphere is weak reducing atmosphere, finally makes the top and bottom temperature difference, the total length temperature difference of continuously cast bloom all be no more than 30 ℃.Because the present invention has added micro alloying element in wire rod, in order to allow the abundant solid solution of micro alloying element in austenite, play the purpose of crystal grain thinning, raising sorbite rate, raising intensity and plasticity, avoid simultaneously scaling loss excessive and original austenite grains is thick, the present invention has suitably reduced the Heating temperature of preheating section, heating zone, proper extension this heat-up time of two periods, and suitably improved the Heating temperature of soaking zone.
Appropriate heating zone temperature, heat-up time and soaking zone temperature, soaking time can give full play to micro alloying element effect and not to the billet quality injury, if the temperature of heating zone, soaking zone is low or lacked heat-up time, micro alloying element fully solid solution in austenite so that its precipitation strength and Grain refinement performance not out; If the temperature height of heating zone, soaking zone or grown heat-up time, the scaling loss that increases blank is affected billet quality, cause its intensity of thick reduction and the plasticity and toughness of original austenite grains.Guarantee the temperature of heating zone and soaking zone, need appropriate design preheating section temperature and warm up time, if the temperature of preheating section is low or lacked heat-up time will make ensuing heating zone temperature not or the steel billet internal and external temperature uneven, if the temperature height of preheating section will increase the blank internal stress and increase the probability that crack defect produces, affect production efficiency if grown reduction steel rolling rhythm the heat-up time of preheating section.
Because surface decarburization is the defective of the normal appearance of high carbon steel, in order to reduce decarburization, data analysis draws the employing weak reducing atmosphere and can effectively control decarburization in many group heating-furnaces.Because normally used continuous casting billet heating stove is walking beam furnace, and walking beam furnace is steel billet head end and tail end switch type " flame ", so there is the temperature difference in continuously cast bloom, in order to improve the poker characteristic homogeneity of finished product, must guarantee that the continuously cast bloom top and bottom temperature difference, the total length temperature difference are no more than 30 ℃.According to the present invention, become in the step of wire rod at temperature-controlled rolling, the control start rolling temperature is 950～990 ℃, so, controlled combinations granularity can reduce roll wear on the other hand on the one hand.If excess Temperature can make original grain thick, reduce product intensity; Wear and tear if temperature is crossed the low milling train that can increase the weight of, increase production cost.
According to the present invention, above-mentioned temperature-controlled rolling becomes the step of wire rod specifically to comprise to make continuously cast bloom to form successively the step of wire rod by roughing unit, intermediate mill, pre-finishing mill group, finishing train and reducing sizing mill group, wherein, the temperature that the control wire rod enters the finishing train entrance is 850～880 ℃, and the temperature that the control wire rod enters reducing sizing mill group entrance is 850～880 ℃.Temperature control is rolled like this, and controlled combinations granularity can reduce roll wear on the other hand on the one hand.If excess Temperature can make coarse grains, reduce product intensity; Wear and tear if temperature is crossed the low milling train that can increase the weight of, greatly increase production cost; In addition, wire rod will guarantee that in too high or too low for temperature all will being difficult to of reducing sizing mill group entrance laying temperature is in claimed range.
According to the present invention, in the step of rolling of weaving silk, the control laying temperature is 860～880 ℃; In the step of control cooling, the rear control of rolling of adopting stelmor control cold line to coil is cooled off, the cooling rate that controlling board twists in before the pearlitic transformation is 9.5～10.5 ℃/s, the pearlitic transformation temperature is controlled at 640～690 ℃, cooling rate is 1.5～2.5 ℃/s after the phase transformation, and the wire rod surface temperature after the cooling, before the aftertreatment is less than or equal to 300 ℃.The purpose of rolling rear control cooling is the phase transition process of control rolled piece behind high temperature rolling, thus control steel structural state, and then comprehensive mechanical property and the use properties of improvement wire rod.Laying temperature is crossed low meeting and is reduced stabilization of austenite, easily separates out the pro-eutectoid phase, is the 82B hypereutectoid steel of cementite mutually for pro-eutectoid, and this will increase its drawing fragility affects the wire rod use properties; The too high one side of laying temperature can make the coarse grains of steel reduce its mechanical property, and also can increase on the other hand the wire rod surface decarburization affects follow-up use.If the cooling rate before the pearlitic transformation is on the low side, can not Quick winding cross pro-eutectoid and form mutually the district, will generate the pro-eutectoid phase that affects the follow-up use of wire rod; If the cooling rate before the pearlitic transformation is too fast, can be difficult to control follow-up transformation temperature and causes abnormal structures such as generating the troostite that affects the follow-up drawing of wire rod even martensite, bainite.The perlite sheet spacing that can increase the pearlitic transformation excess Temperature reduces sorbite percentage, and it is meticulous and form troostite that the pearlitic transformation temperature is crossed the low perlite sheet spacing that can make, and this all will affect the follow-up drawing property of wire rod.Therefore, must determine rational laying temperature and cooperate suitable cooling control after rolling technique, just can obtain the tissue that needs.
At the embodiment of high-strength prestressed steel wire of the present invention with the production technique of 82B wire rod, the nominal diameter of wire rod finished product is 6.5mm.And, one side total decarburized layer degree of depth of the wire rod finished product that obtains with the production technique of 82B wire rod of high-strength prestressed steel wire is not more than 1.5% of wire rod finished product nominal diameter according to an exemplary embodiment of the present invention, and wherein total decarburized layer comprises ferrite and transition layer; Be mainly nodular troostite in the metallographic structure of wire rod finished product, sorbitic content is no less than 85%, and does not allow the existence of cementite network and quenching structure (martensite and troostite zone); The tensile strength R of the hot rolling sample of wire rod finished product
m〉=1210MPa, elongation A 〉=9%, relative reduction in area Z 〉=25%, the tensile strength R of the sample of wire rod finished product timeliness after 15 days
m〉=1200MPa, elongation A 〉=11%, relative reduction in area Z 〉=30%.
High-strength prestressed steel wire according to the present invention then is to adopt above-mentioned high-strength prestressed steel wire to make with the production technique of 82B wire rod with the 82B wire rod.In the embodiment of high-strength prestressed steel wire of the present invention with the 82B wire rod, the nominal diameter of wire rod is 6.5mm; The local total decarburized layer degree of depth in one side of wire rod is not more than 1.5% of wire rod finished product nominal diameter; Be mainly nodular troostite in the metallographic structure of wire rod finished product, sorbitic content is no less than 85%; The tensile strength R of the hot rolling sample of wire rod
m〉=1210MPa, elongation A 〉=9%, relative reduction in area Z 〉=25%, the tensile strength R of the sample of wire rod timeliness after 15 days
m〉=1200MPa, elongation A 〉=11%, relative reduction in area Z 〉=32%.
Particularly, high-strength prestressed steel wire according to the present invention can may further comprise the steps with the exemplary embodiment of the production technique of 82B wire rod:
Raw material preparation, smelting molten steel, continuous casting become base, add hot continuously cast material, temperature-controlled rolling becomes wire rod, the rolling of weaving silk, control cooling, aftertreatment and obtain the wire rod finished product.
Comprise specifically that raw material (blast-melted) → 50 ton converter → LF stove → continuous casting → steel billet check → (reconditioning) → process furnace charging roller material loading → steel billet enters stove → walking-beam furnace heating → furnace delivery table steel billet to come out of the stove → six rolling → 1# flying shear crops of high-pressure water descaling → roughing → in roll six rolling → 2# flying shear crops, tail → in roll two rolling → pre-four rolling (comprising vertical kink) → 1# of finish rolling, 2# water cooling box cooling → 3# flying shear crop → Horizontal loose sleeve → BGV6 frame finish rolling → 3#, 4# water cooling box cooling → TMB1+TMB2 subtracts fixed diameter rolling → 5# water tank cooling → (pinch roll) → Laying head → loose volume, and air-cooled → collection furls collection → extension volume → PF hook-type fortune machine and transports → check on the quality, sampling, wipe out end to end → compress the bundling → extension label of weighing → unload volume → warehouse-in → finished product to transport.
Wherein, high-strength prestressed steel wire is as shown in table 1 with the optimization of Chemical Composition design of 82B wire rod.
The table 1 high-strength prestressed steel wire chemical ingredients of 82B wire rod
| C | Si | Mn | P | S | As |
| 0.80～0.85 | 0.15～0.30 | 0.70～0.90 | ≤0.025 | ≤0.025 | ≤0.020 |
| Cr | Ni | Cu | V | Mo | Alt |
| 0.15～0.30 | ≤0.10 | ≤0.05 | 0.02～0.05 | ≤0.03 | ≤0.02 |
| Sn | N | O | H | ||
| ≤0.010 | ≤0.0070 | ≤0.0020 | ≤0.00020 |
Continuously cast bloom heating condition optimal control in the process furnace is as shown in table 2.
The heating condition of table 2 continuously cast bloom
Air-fuel ratio is 0.75～0.82, and furnace atmosphere is week reduction, and the top and bottom temperature difference of continuously cast bloom, the total length temperature difference all should be no more than 30 ℃.Wherein, the composition of weak reducing atmosphere is as shown in table 3.
The gas content of table 3 weak reducing atmosphere
To enter the temperature of finishing train entrance be 850～880 ℃ to wire rod during controlled rolling, and the temperature that enters reducing sizing mill group entrance is 850-880 ℃; Laying temperature is 860-880 ℃.
The control cooling adopts stelmor control cold line to carry out, the control of stelmor roller-way speed is as shown in table 4, the control of stelmor fan delivery is as shown in table 5, realize that it is 9.5～10.5 ℃/s that controlling board twists in the front cooling rate of pearlitic transformation, the pearlitic transformation temperature is controlled at 640～690 ℃, cooling rate is 1.5～2.5 ℃/s after the phase transformation, and makes the surface temperature≤300 ℃ of wire rod after the cooling.
Table 4 stelmor roller-way speed
| The roller-way section | 1 section | 2 sections | 3 sections | 4 sections | 5 sections | 6 sections | 7 sections |
| Roller-way speed (m/s) | 0.62 | 0.62 | 0.65 | 0.68 | 0.71 | 0.75 | 0.79 |
| The roller-way section | 8 sections | 9 sections | 10 sections | 11 sections | 12 sections | 13 sections | |
| Roller-way speed (m/s) | 0.83 | 0.87 | 0.91 | 0.96 | 0.96 | 0.96 |
Table 5 stelmor fan delivery
| The blower fan numbering | 1# | 2# | 3# | 4# | 5# | 6# | 7# | 8# | 9# | 10# | 11# | 12# |
| Air quantity (HZ) | 41 | 41 | 39 | 39 | 38 | 38 | 38 | 38 | 30 | 30 | 30 | 30 |
The mechanical performance index that present embodiment will reach is as shown in table 6.
Table 6 mechanical performance index
The local total decarburized layer degree of depth in one side of the wire rod that present embodiment obtains should be not more than 1.5% of wire rod nominal diameter, and metallographic structure is mainly nodular troostite, wherein sorbite is no less than 90%, does not allow the existence in cementite network and quenching structure (martensite and troostite zone).
The below enumerates concrete example and comes exemplary embodiment of the present invention is further elaborated.Example only is used for explanation the present invention, and is not to limit by any way the present invention.
In the example below, it is high-strength prestressed steel wire 82B wire rod 3 stoves of 6.5mm that nominal diameter has been manufactured experimently in production, difference called after sample one, sample two and sample three, its concrete production technique is strictly carried out with the production technique of 82B wire rod by above-mentioned high-strength prestressed steel wire, the finished product of each sample of gained after check indices such as table 7, table 8, table 9 and Fig. 1 to shown in Figure 3.
The high-strength prestressed steel wire of the table 7 Φ 6.5mm chemical ingredients of 82B wire rod
As shown in Table 7, all in the scope of design value, and sample one is 0.20～0.24% to the Cr element in the sample three to the high-strength prestressed steel wire of 3 stoves of trial-production with the chemical ingredients of 82B wire rod, and V element is 0.024～0.025%.
The high-strength prestressed steel wire of the table 8 Φ 6.5mm mechanical property of 82B wire rod
As shown in Table 8, the high-strength prestressed steel wire of the Φ 6.5mm of trial-production has all reached the internally controlling requirement value with the sample one of 82B wire rod to the mechanical property of sample three, has realized the combination of high-strength high-plasticity, good mechanical performance.
The micro test interpretation of result of 82B wire rod of the high-strength prestressed steel wire of table 9 Φ 6.5mm
Can be found out by table 9, Fig. 1 to Fig. 3, high-strength prestressed steel wire according to the present invention is fine with the high power quality of 82B wire rod with the high-strength prestressed steel wire of the Φ 6.5mm that the production technique of 82B wire rod is produced, reach compressor wire and steel strand with the national standard of gren rod, also satisfied user's service requirements.
In sum, the present invention has realized the combination of high-carbon steel wire rod high strength and high-ductility by optimization of Chemical Composition design (carrying out Cr, V microalloying), adjustment process furnace heating cycle, optimization cooling controlling and rolling controlling process.The high-strength prestressed steel wire of the Φ 6.5mm that produces of trial-production satisfies the production requirement of downstream user with the national standard requirement that high power quality and the mechanical property of 82B wire rod all is better than compressor wire and steel strand usefulness gren rod.
Although the above has described the present invention in conjunction with exemplary embodiment, those of ordinary skills should be clear, in the situation of the spirit and scope that do not break away from claim, can carry out various modifications to above-described embodiment.
Claims (8)
1. a high-strength prestressed steel wire is characterized in that described production technique comprises following operation with the production technique of 82B wire rod:
Raw material preparation, smelting molten steel, continuous casting become base, add hot continuously cast material, temperature-controlled rolling becomes wire rod, the rolling of weaving silk, control cooling, aftertreatment and obtain the wire rod finished product,
Wherein, by weight percentage, described wire rod finished product comprises following chemical ingredients: C:0.80～0.85%, Si:0.15～0.30%, Mn:0.70～0.90%, P≤0.025%, S≤0.025%, Cr:0.15～0.30%, Ni≤0.10%, Cu≤0.05%, V:0.02～0.05%, Als≤0.020%, and the Fe of surplus and inevitable impurity;
In the described step that adds hot continuously cast material, control preheating section temperature is that 700～760 ℃, warm up time are 35～50 minutes, the heating zone temperature is that 960～1000 ℃, heat-up time are 35～50 minutes, the soaking zone temperature is that 990～1030 ℃, soaking time are 30～40min, and the control furnace atmosphere is weak reducing atmosphere;
Become in the step of wire rod at described temperature-controlled rolling, the control start rolling temperature is 950～990 ℃;
In the step of the described rolling of weaving silk, the control laying temperature is 860～880 ℃;
In the step of described control cooling, the rear control of rolling of adopting stelmor control cold line to coil is cooled off, the cooling rate that controlling board twists in before the pearlitic transformation is 9.5～10.5 ℃/s, the pearlitic transformation temperature is controlled at 640～690 ℃, cooling rate is 1.5～2.5 ℃/s after the phase transformation, makes the wire rod surface temperature that cooling is rear, aftertreatment is front be less than or equal to 300 ℃.
2. high-strength prestressed steel wire according to claim 1 is with the production technique of 82B wire rod, it is characterized in that, described temperature-controlled rolling becomes the step of wire rod to comprise to make continuously cast bloom to form successively the step of wire rod by roughing unit, intermediate mill, pre-finishing mill group, finishing train and reducing sizing mill group, wherein, the temperature that the control wire rod enters the finishing train entrance is 850～880 ℃, and the temperature that the control wire rod enters reducing sizing mill group entrance is 850～880 ℃.
3. high-strength prestressed steel wire according to claim 1 is characterized in that with the production technique of 82B wire rod, by weight percentage, contains 0.20～0.24% Cr, 0.020～0.025% V in the described wire rod finished product.
4. high-strength prestressed steel wire according to claim 1 is characterized in that with the production technique of 82B wire rod the nominal diameter of described wire rod finished product is 6.5mm.
5. high-strength prestressed steel wire according to claim 1 is characterized in that with the production technique of 82B wire rod, and the local total decarburized layer degree of depth in one side of described wire rod finished product is not more than 1.5% of wire rod finished product nominal diameter.
6. high-strength prestressed steel wire according to claim 1 is characterized in that with the production technique of 82B wire rod be mainly nodular troostite in the metallographic structure of described wire rod finished product, sorbitic content is no less than 90%.
7. high-strength prestressed steel wire according to claim 1 is characterized in that the actual measurement tensile strength R of described wire rod finished product with the production technique of 82B wire rod
m〉=1200MPa, elongation A 〉=11%, relative reduction in area Z 〉=30%.
8. a high-strength prestressed steel wire 82B wire rod is characterized in that, described wire rod according to claim 1 in 7 each described high-strength prestressed steel wire make with the production technique of 82B wire rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210372518.9A CN102876983B (en) | 2012-09-29 | 2012-09-29 | Production process for 82B wire rod used for high strength prestressed steel wire and wire rod thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210372518.9A CN102876983B (en) | 2012-09-29 | 2012-09-29 | Production process for 82B wire rod used for high strength prestressed steel wire and wire rod thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102876983A true CN102876983A (en) | 2013-01-16 |
| CN102876983B CN102876983B (en) | 2014-05-21 |
Family
ID=47478492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210372518.9A Active CN102876983B (en) | 2012-09-29 | 2012-09-29 | Production process for 82B wire rod used for high strength prestressed steel wire and wire rod thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102876983B (en) |
Cited By (38)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103305675A (en) * | 2013-06-13 | 2013-09-18 | 攀钢集团成都钢钒有限公司 | Method for controlling surface decarburized layer of hot-finished rod for steel cord |
| CN103305674A (en) * | 2013-06-13 | 2013-09-18 | 攀钢集团成都钢钒有限公司 | Method for controlling thickness of surface decarburized layer of hot-finished rod for steel cord |
| CN103334049A (en) * | 2013-04-11 | 2013-10-02 | 内蒙古包钢钢联股份有限公司 | High carbon hard wire rod production method |
| CN103468920A (en) * | 2013-08-20 | 2013-12-25 | 首钢总公司 | High-carbon steel rod on-line aging high-speed production method |
| CN104001741A (en) * | 2014-04-29 | 2014-08-27 | 张家港联峰钢铁研究所有限公司 | Post-rolling cooling control method for small-size high-Cr 82B wire rods |
| CN104388826A (en) * | 2014-10-12 | 2015-03-04 | 首钢总公司 | Method for reducing hypereutectoid wire rod core network cementite |
| CN104451420A (en) * | 2014-12-15 | 2015-03-25 | 天津冶金集团中兴盛达钢业有限公司 | Low-temperature resistant steel strand suitable for liquefied natural gas engineering and production method thereof |
| CN104451413A (en) * | 2014-12-19 | 2015-03-25 | 重庆钢铁股份有限公司 | Hard wire steel wire rod |
| CN104588435A (en) * | 2014-12-28 | 2015-05-06 | 鞍钢钢绳有限责任公司 | Production method of 2000MPa-level microalloying steel wire for producing ropes |
| CN104651724A (en) * | 2015-02-11 | 2015-05-27 | 宣化钢铁集团有限责任公司 | Coil rod for pre-stressed steel strand and production method of coil rod |
| CN104789880A (en) * | 2015-03-03 | 2015-07-22 | 张家港联峰钢铁研究所有限公司 | Steel strand wire rod with characteristics of low carbon, high strength and high toughness, and production process thereof |
| CN105080980A (en) * | 2015-09-15 | 2015-11-25 | 江苏沙钢集团有限公司 | Method for controlling cooling after rolling of high-carbon steel coil rod |
| CN105296739A (en) * | 2014-07-11 | 2016-02-03 | 鞍钢钢绳有限责任公司 | Heat treatment process for microalloyed steel wire |
| CN105506500A (en) * | 2014-09-26 | 2016-04-20 | 宝山钢铁股份有限公司 | High-strength coil rod excellent in low-temperature performance and manufacturing method of high-strength coil rod |
| CN105886948A (en) * | 2015-01-26 | 2016-08-24 | 鞍钢股份有限公司 | Production method for 35Si2Cr steel bar for high-speed railway ballastless track |
| CN106271449A (en) * | 2016-08-31 | 2017-01-04 | 云南德胜钢铁有限公司 | A kind of technique using bloom production fine grain valve snail reinforcing bar |
| CN106513439A (en) * | 2016-10-10 | 2017-03-22 | 武汉钢铁股份有限公司 | Manufacturing method for hot-rolled high-carbon steel sheet strip with single-face decarburized layer ratio smaller than 0.7% |
| CN106623415A (en) * | 2016-11-28 | 2017-05-10 | 邢台钢铁有限责任公司 | Rolling method of 0Cr17 stainless steel disc strip |
| CN106812002A (en) * | 2015-12-01 | 2017-06-09 | 衡阳市新德力预应力有限公司 | A kind of production method of prestress wire |
| CN107557675A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | A kind of high-strength corrosion-resistant erosion steel strand wires wire rod and its production method |
| CN107815525A (en) * | 2017-11-30 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloy containing Nb builds steel wire rod and its production method |
| CN108300938A (en) * | 2018-01-19 | 2018-07-20 | 天津荣程联合钢铁集团有限公司 | A kind of rolled wire steel and its processing method |
| CN108396238A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A kind of 1860MPa grades of corrosion resisting steel wire rods for steel strands and its production method |
| CN108611572A (en) * | 2018-05-11 | 2018-10-02 | 鞍钢股份有限公司 | A kind of high-ductility hypereutectoid steel spring plate and its production method |
| CN109622644A (en) * | 2018-12-11 | 2019-04-16 | 天津冶金集团中兴盛达钢业有限公司 | A kind of compressor wire and its manufacturing method of small relaxation rate |
| CN110129540A (en) * | 2019-06-10 | 2019-08-16 | 南京钢铁股份有限公司 | Improvement bearing steel surface, which is quenched, is tempered the process of line and staff control |
| CN111020146A (en) * | 2019-12-27 | 2020-04-17 | 新疆八一钢铁股份有限公司 | Steel rolling heating method for controlling 82B net carbon |
| CN111172469A (en) * | 2020-01-08 | 2020-05-19 | 柳州钢铁股份有限公司 | SWRH82B wire rod with low acid-soluble aluminum content |
| CN111663083A (en) * | 2020-06-22 | 2020-09-15 | 河钢股份有限公司承德分公司 | Vanadium-containing hot-rolled disc round steel and production method thereof |
| CN111996349A (en) * | 2020-08-05 | 2020-11-27 | 鞍钢股份有限公司 | Production method of low-strength and high-elongation cord steel wire rod |
| CN112226594A (en) * | 2020-10-19 | 2021-01-15 | 江苏永钢集团有限公司 | Production method for reducing abnormal 50CrV tissue |
| CN112301287A (en) * | 2020-11-09 | 2021-02-02 | 江苏省沙钢钢铁研究院有限公司 | Prestressed steel strand, wire rod for prestressed steel strand and production method of wire rod |
| CN113355595A (en) * | 2021-05-19 | 2021-09-07 | 天津荣程联合钢铁集团有限公司 | Large-size high-strength prestressed steel, preparation process and application thereof |
| CN113600623A (en) * | 2021-08-06 | 2021-11-05 | 新疆八一钢铁股份有限公司 | Method for inhibiting high-carbon steel wire rod SWRH82B core net-shaped cementite |
| CN113913681A (en) * | 2021-08-26 | 2022-01-11 | 武汉钢铁有限公司 | High-strength low-wire-breakage-rate cord steel, rolling method and application thereof |
| CN113981312A (en) * | 2021-09-29 | 2022-01-28 | 武钢集团昆明钢铁股份有限公司 | Hot-rolled wire rod for high-strength low-relaxation prestressed steel strand and preparation method thereof |
| CN114369708A (en) * | 2022-01-18 | 2022-04-19 | 新余钢铁股份有限公司 | Medium-high carbon steel wire rod and method for eliminating net-shaped ferrite at core part of medium-high carbon steel wire rod |
| CN117165751A (en) * | 2023-08-08 | 2023-12-05 | 北京科技大学 | Method for improving full-length tissue uniformity of microalloyed high-strength steel cold-rolled base stock |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102181786A (en) * | 2011-04-25 | 2011-09-14 | 江苏省沙钢钢铁研究院有限公司 | Coil rod used for 1670MPa level bridge cable zinc-coated wire and preparation method of coil rod |
-
2012
- 2012-09-29 CN CN201210372518.9A patent/CN102876983B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102181786A (en) * | 2011-04-25 | 2011-09-14 | 江苏省沙钢钢铁研究院有限公司 | Coil rod used for 1670MPa level bridge cable zinc-coated wire and preparation method of coil rod |
Cited By (49)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334049A (en) * | 2013-04-11 | 2013-10-02 | 内蒙古包钢钢联股份有限公司 | High carbon hard wire rod production method |
| CN103305675B (en) * | 2013-06-13 | 2015-02-18 | 攀钢集团成都钢钒有限公司 | Method for controlling surface decarburized layer of hot-finished rod for steel cord |
| CN103305674A (en) * | 2013-06-13 | 2013-09-18 | 攀钢集团成都钢钒有限公司 | Method for controlling thickness of surface decarburized layer of hot-finished rod for steel cord |
| CN103305675A (en) * | 2013-06-13 | 2013-09-18 | 攀钢集团成都钢钒有限公司 | Method for controlling surface decarburized layer of hot-finished rod for steel cord |
| CN103305674B (en) * | 2013-06-13 | 2014-12-17 | 攀钢集团成都钢钒有限公司 | Method for controlling thickness of surface decarburized layer of hot-finished rod for steel cord |
| CN103468920A (en) * | 2013-08-20 | 2013-12-25 | 首钢总公司 | High-carbon steel rod on-line aging high-speed production method |
| CN104001741A (en) * | 2014-04-29 | 2014-08-27 | 张家港联峰钢铁研究所有限公司 | Post-rolling cooling control method for small-size high-Cr 82B wire rods |
| CN104001741B (en) * | 2014-04-29 | 2016-03-30 | 张家港联峰钢铁研究所有限公司 | The 82B wire rod of a kind of small dimension height Cr rolls rear controlled cooling model method |
| CN105296739A (en) * | 2014-07-11 | 2016-02-03 | 鞍钢钢绳有限责任公司 | Heat treatment process for microalloyed steel wire |
| CN105506500A (en) * | 2014-09-26 | 2016-04-20 | 宝山钢铁股份有限公司 | High-strength coil rod excellent in low-temperature performance and manufacturing method of high-strength coil rod |
| CN104388826A (en) * | 2014-10-12 | 2015-03-04 | 首钢总公司 | Method for reducing hypereutectoid wire rod core network cementite |
| CN104451420A (en) * | 2014-12-15 | 2015-03-25 | 天津冶金集团中兴盛达钢业有限公司 | Low-temperature resistant steel strand suitable for liquefied natural gas engineering and production method thereof |
| CN104451413A (en) * | 2014-12-19 | 2015-03-25 | 重庆钢铁股份有限公司 | Hard wire steel wire rod |
| CN104588435A (en) * | 2014-12-28 | 2015-05-06 | 鞍钢钢绳有限责任公司 | Production method of 2000MPa-level microalloying steel wire for producing ropes |
| CN104588435B (en) * | 2014-12-28 | 2017-02-22 | 鞍钢钢绳有限责任公司 | Production method of 2000MPa-level microalloying steel wire for producing ropes |
| CN105886948A (en) * | 2015-01-26 | 2016-08-24 | 鞍钢股份有限公司 | Production method for 35Si2Cr steel bar for high-speed railway ballastless track |
| CN104651724A (en) * | 2015-02-11 | 2015-05-27 | 宣化钢铁集团有限责任公司 | Coil rod for pre-stressed steel strand and production method of coil rod |
| CN104789880A (en) * | 2015-03-03 | 2015-07-22 | 张家港联峰钢铁研究所有限公司 | Steel strand wire rod with characteristics of low carbon, high strength and high toughness, and production process thereof |
| CN105080980A (en) * | 2015-09-15 | 2015-11-25 | 江苏沙钢集团有限公司 | Method for controlling cooling after rolling of high-carbon steel coil rod |
| CN106812002A (en) * | 2015-12-01 | 2017-06-09 | 衡阳市新德力预应力有限公司 | A kind of production method of prestress wire |
| CN107557675A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | A kind of high-strength corrosion-resistant erosion steel strand wires wire rod and its production method |
| CN107557675B (en) * | 2016-06-30 | 2019-01-08 | 鞍钢股份有限公司 | A kind of high-strength corrosion-resistant erosion steel strand wires wire rod and its production method |
| CN106271449A (en) * | 2016-08-31 | 2017-01-04 | 云南德胜钢铁有限公司 | A kind of technique using bloom production fine grain valve snail reinforcing bar |
| CN106513439A (en) * | 2016-10-10 | 2017-03-22 | 武汉钢铁股份有限公司 | Manufacturing method for hot-rolled high-carbon steel sheet strip with single-face decarburized layer ratio smaller than 0.7% |
| CN106623415A (en) * | 2016-11-28 | 2017-05-10 | 邢台钢铁有限责任公司 | Rolling method of 0Cr17 stainless steel disc strip |
| CN108396238A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | A kind of 1860MPa grades of corrosion resisting steel wire rods for steel strands and its production method |
| CN107815525A (en) * | 2017-11-30 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloy containing Nb builds steel wire rod and its production method |
| CN108300938A (en) * | 2018-01-19 | 2018-07-20 | 天津荣程联合钢铁集团有限公司 | A kind of rolled wire steel and its processing method |
| CN108611572A (en) * | 2018-05-11 | 2018-10-02 | 鞍钢股份有限公司 | A kind of high-ductility hypereutectoid steel spring plate and its production method |
| CN109622644A (en) * | 2018-12-11 | 2019-04-16 | 天津冶金集团中兴盛达钢业有限公司 | A kind of compressor wire and its manufacturing method of small relaxation rate |
| CN110129540A (en) * | 2019-06-10 | 2019-08-16 | 南京钢铁股份有限公司 | Improvement bearing steel surface, which is quenched, is tempered the process of line and staff control |
| CN111020146A (en) * | 2019-12-27 | 2020-04-17 | 新疆八一钢铁股份有限公司 | Steel rolling heating method for controlling 82B net carbon |
| CN111172469B (en) * | 2020-01-08 | 2021-11-12 | 柳州钢铁股份有限公司 | SWRH82B wire rod with low acid-soluble aluminum content |
| CN111172469A (en) * | 2020-01-08 | 2020-05-19 | 柳州钢铁股份有限公司 | SWRH82B wire rod with low acid-soluble aluminum content |
| CN111663083A (en) * | 2020-06-22 | 2020-09-15 | 河钢股份有限公司承德分公司 | Vanadium-containing hot-rolled disc round steel and production method thereof |
| CN111996349A (en) * | 2020-08-05 | 2020-11-27 | 鞍钢股份有限公司 | Production method of low-strength and high-elongation cord steel wire rod |
| CN112226594A (en) * | 2020-10-19 | 2021-01-15 | 江苏永钢集团有限公司 | Production method for reducing abnormal 50CrV tissue |
| CN112301287A (en) * | 2020-11-09 | 2021-02-02 | 江苏省沙钢钢铁研究院有限公司 | Prestressed steel strand, wire rod for prestressed steel strand and production method of wire rod |
| CN112301287B (en) * | 2020-11-09 | 2022-06-21 | 江苏省沙钢钢铁研究院有限公司 | Prestressed steel strand, wire rod for prestressed steel strand and production method of wire rod |
| CN113355595A (en) * | 2021-05-19 | 2021-09-07 | 天津荣程联合钢铁集团有限公司 | Large-size high-strength prestressed steel, preparation process and application thereof |
| CN113355595B (en) * | 2021-05-19 | 2022-05-24 | 天津荣程联合钢铁集团有限公司 | Large-size high-strength prestressed steel, preparation process and application thereof |
| CN113600623A (en) * | 2021-08-06 | 2021-11-05 | 新疆八一钢铁股份有限公司 | Method for inhibiting high-carbon steel wire rod SWRH82B core net-shaped cementite |
| CN113913681A (en) * | 2021-08-26 | 2022-01-11 | 武汉钢铁有限公司 | High-strength low-wire-breakage-rate cord steel, rolling method and application thereof |
| CN113913681B (en) * | 2021-08-26 | 2022-03-25 | 武汉钢铁有限公司 | High-strength low-wire-breakage-rate cord steel, rolling method and application thereof |
| CN113981312A (en) * | 2021-09-29 | 2022-01-28 | 武钢集团昆明钢铁股份有限公司 | Hot-rolled wire rod for high-strength low-relaxation prestressed steel strand and preparation method thereof |
| CN114369708A (en) * | 2022-01-18 | 2022-04-19 | 新余钢铁股份有限公司 | Medium-high carbon steel wire rod and method for eliminating net-shaped ferrite at core part of medium-high carbon steel wire rod |
| CN114369708B (en) * | 2022-01-18 | 2023-11-24 | 新余钢铁股份有限公司 | Medium-high carbon steel wire rod and method for eliminating net ferrite in core of medium-high carbon steel wire rod |
| CN117165751A (en) * | 2023-08-08 | 2023-12-05 | 北京科技大学 | Method for improving full-length tissue uniformity of microalloyed high-strength steel cold-rolled base stock |
| CN117165751B (en) * | 2023-08-08 | 2024-04-16 | 北京科技大学 | Method for improving full-length tissue uniformity of microalloyed high-strength steel cold-rolled base stock |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102876983B (en) | 2014-05-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102876983B (en) | Production process for 82B wire rod used for high strength prestressed steel wire and wire rod thereof | |
| CN102912101B (en) | Production process of 65 Mn spring steel wire rod and 65 Mn spring steel wire rod | |
| CN110184525B (en) | High-strength Q500GJE quenched and tempered steel plate for building structure and manufacturing method thereof | |
| CN105624564B (en) | A kind of excellent carbon steel wire rod with high of fine steel cord drawing processing characteristics and manufacture method | |
| CN103045935B (en) | Control method for surface decarburization and ferrite distribution of steel disc bar of spring | |
| CN103305675B (en) | Method for controlling surface decarburized layer of hot-finished rod for steel cord | |
| CN102671938B (en) | High speed production method for controlling banded structure of low carbon steel wire rod | |
| CN101586182B (en) | Method for reducing net level of bearing steel wire rod carbide | |
| CN102162025B (en) | Method for reducing center martensitic structure of high-carbon steel coil rod | |
| CN104561816A (en) | High-strength fatigue-resistant high-performance steel rail and production method thereof | |
| CN115161536B (en) | Hot rolled wire rod reinforcing steel bar | |
| CN112501498A (en) | Wire rod for 2300MPa prestressed steel strand and production method thereof | |
| CN102876968B (en) | High-strength anti-seismic HRB500E hot-rolled ribbed bar and production process thereof | |
| CN103572025A (en) | Production method of low-cost X52 pipeline steel and pipeline steel | |
| CN104988409A (en) | Non-annealed cold forging steel hot-rolled wire rod and production method thereof | |
| CN108004470B (en) | High strength steel strand low manganese high-carbon steel wire rod and preparation method | |
| CN102517500A (en) | Rolling process for producing 35CrMo alloy cold forging steel through adopting small billets | |
| CN112090956B (en) | Production control method of wire rod for low-segregation high-torsion bridge cable | |
| CN102643970A (en) | Production method of hot-rolled ribbed bar coil | |
| CN111530942A (en) | Hot rolling process of high-quality carbon structural steel | |
| CN104018063B (en) | The production method of low-alloy high-strength Q420C medium plates | |
| US20230416882A1 (en) | Tire cord steel with high strength and low wire breakage rate, and rolling method and use thereof | |
| CN100355925C (en) | Micro-alloying production for 82B wire rod of steel strand | |
| CN103045945B (en) | Economical fabrication method of high-toughness X70 pipeline hot rolled steel plate coil | |
| CN114875205B (en) | Non-microalloy HRB400E hot rolled ribbed bar and production method 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 |