CN109735699A - The production method for preventing the no remarkable yield point of hot rolled ribbed bars containing niobium - Google Patents
The production method for preventing the no remarkable yield point of hot rolled ribbed bars containing niobium Download PDFInfo
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- CN109735699A CN109735699A CN201811549673.7A CN201811549673A CN109735699A CN 109735699 A CN109735699 A CN 109735699A CN 201811549673 A CN201811549673 A CN 201811549673A CN 109735699 A CN109735699 A CN 109735699A
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- rolling
- temperature
- hot rolled
- ribbed bars
- yield point
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- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 229910052758 niobium Inorganic materials 0.000 title claims abstract description 38
- 239000010955 niobium Substances 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000005096 rolling process Methods 0.000 claims abstract description 48
- 238000001816 cooling Methods 0.000 claims abstract description 29
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000002791 soaking Methods 0.000 claims abstract description 4
- 230000002265 prevention Effects 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 229910000859 α-Fe Inorganic materials 0.000 claims description 9
- 229910001562 pearlite Inorganic materials 0.000 claims description 8
- -1 heating Chemical compound 0.000 abstract 1
- 239000013078 crystal Substances 0.000 description 8
- 229910001566 austenite Inorganic materials 0.000 description 7
- 229910001563 bainite Inorganic materials 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 229910000756 V alloy Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Abstract
The invention discloses a kind of production methods for preventing the no remarkable yield point of hot rolled ribbed bars containing niobium, including heating, rolling, cooling process；Its improvements are as follows: heating temperature is 1050-1250 DEG C, and soaking temperature is 1100-1250 DEG C, and start rolling temperature is 1000-1150 DEG C；When start rolling temperature is 1000-1100 DEG C, through continuous rolling, 920-980 DEG C of temperature on cooling table；When 1000 DEG C of start rolling temperature≤1150 DEG C <, after the rolling of 3 rolling mills, rolled blank is cooled to 940-980 DEG C through roller-way, by continuous rolling, controls 920-980 DEG C of temperature on cooling table.Using hot rolled ribbed bars containing niobium produced by the invention, the no remarkable yield phenomenon of reinforcing bar containing niobium can be prevented completely.
Description
Technical field
The invention belongs to metal-pressed machine fields, more particularly to prevent the no remarkable yield point of hot rolled ribbed bars containing niobium
Production method.
Background technique
For a long time, 400Mpa grades or more of hot rolled ribbed bars of China's production mainly use vanadium iron or VN alloy
Microalloying technique, the reinforcing bar produced using the technique, is ferrite and pearlite from rebar surface to center portion microstructure
Tissue.Other than vanadium micro-alloying technique, some enterprises do not add microalloy element but use and wear water by force to reduce cost
Technique produces hot-rolled reinforced bar, and the reinforcing bar outermost layer of technique production is tempered martensite, and inside is ferrite and pearlite tissue.
Being distinctly claimed steel area periphery not with the formulation and implementation of national standard GB/T1499.2-2018, in standard allows difference occur
In the ring of internal contrast, it is desirable that reinforcing bar is ferrite and pearlite tissue from a surface to center portion microstructure, therefore, standard from
Tissue distinguishes the reinforcing bar using different process production, the production for wearing hydraulic art hot-rolled reinforced bar is limited, to prevent
Obscure in reinforcing bar market；The implementation of new standard is so that reinforcing bar manufacturing enterprise starts largely to make using traditional vanadium microalloy technology production
It is increased considerably at vanadium iron demand；On the other hand, with the reinforcement of national environmental protection renovation dynamics, vanadium alloy resource provisioning is nervous,
Many-sided reason makes vanadium alloy price rise sharply, and causes traditional vanadium iron or v n micro alloying technique reinforcing bar production cost significantly
It improves.
In order to reduce production cost, the manufacturing enterprise in China starts to produce reinforcing bar containing Nb-microalloying, but using such conjunction
Non-yield point, which often occurs, in golden reinforcing bar to be shown as although regulation can be made when surrendering unobvious of extensometer in standard
Rp0.2, but user does not have survey R generallyp0.2Condition, and when reinforcing bar occur surrender it is unobvious when, bainite, geneva in tissue
Body content is more, and the plasticity of reinforcing bar is poor, therefore the quality complaint generated is more；In addition, if reinforcing bar does not have sharp yield point,
The safe early warning effect of reinforcing bar will substantially reduce, and anti-seismic performance decreases, and therefore, the reinforcing bar of sharp yield point is not actually
It is not approved by construction sector and market.The prevention appearance of hot rolled ribbed bars containing niobium must take measures without yield phenomenon.
In order to make reinforcing bar containing niobium apparent yield point occur, the patent application of Publication No. CN 101255492A is disclosed
A kind of " production method of prevention niobium micro-alloyed hot-rolled rib steel bar no remarkable yield point ", it is right according to the difference of environment temperature
Temperature range is set forth in heating temperature, temperature on cooling table, but it is 1040~1120 DEG C that heating temperature is relatively low, low heating temperature
Degree is unfavorable for the solid solution of niobium element, not only influences making full use of for microalloy element, and higher to milling equipment Capability Requirement.
In addition, the patent application is in order to make reinforcing bar sharp yield point occur, lower temperature on cooling table control is 820~910 DEG C, after rolling
Water cooling intensity is larger, and reinforcing bar outermost layer is caused thin crystal layer occur, and the uniformity of reinforcing bar tissue is poor.In addition to this, specially using this
The phenomenon that there is the unconspicuous probability < 1% of yield point of steel bar in benefit, can not prevent reinforcing bar no remarkable yield point completely.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind, can to prevent completely yield point of steel bar containing niobium unconspicuous
Production method can be obtained obvious by rationally being controlled heating temperature, soaking temperature, rolling temperature and temperature on cooling table
Yield point elongation.
Solve the technical solution of above-mentioned technical problem are as follows:
Prevent the production method of the no remarkable yield point of hot rolled ribbed bars containing niobium, main includes heating, rolling, cooling process；Its
Improvements are as follows: in the heating process, heating temperature is 1050~1250 DEG C, and soaking temperature is 1100~1250 DEG C；It is described
The start rolling temperature of rolling process is 1000~1150 DEG C；The temperature on cooling table of the cooling process is 920~980 DEG C.
The production method of above-mentioned prevention hot rolled ribbed bars containing niobium no remarkable yield point, when start rolling temperature is 1000~1100
DEG C when, rolled blank, at reinforcing bar, is then cooled by water through continuous rolling, control temperature on cooling table be 920~980 DEG C；When 1100 DEG C
When start rolling temperature≤1150 DEG C <, rolled blank first carries out 3 rolling mill rollings, and rolled blank is cooled to 940~980 through roller-way later
DEG C, continuous rolling is then carried out into reinforcing bar, is then cooled by water, and control temperature on cooling table is 920~980 DEG C.
The production method of above-mentioned prevention hot rolled ribbed bars containing niobium no remarkable yield point, the niobium of the hot rolled ribbed bars contain
Amount is 0.01~0.04wt%.
The production method of above-mentioned prevention hot rolled ribbed bars containing niobium no remarkable yield point, the hot rolled ribbed bars are diameter
The vertical bar bar of 20~36mm.
The production method of above-mentioned prevention hot rolled ribbed bars containing niobium no remarkable yield point, the rolled blank are rolled through 3 rolling mills
After system, the mode of rolling blank roller way cooling is to move back and forth on roller-way, so that rolled blank is cooled to 940~980 DEG C, then carries out
Continuous rolling.
The production method of above-mentioned prevention hot rolled ribbed bars containing niobium no remarkable yield point, the hot rolled ribbed bars it is micro-
Tissue is mainly ferrite+pearlite, and ferrite+pearlite accounts for area percentage >=98% of microscopic structure.
Theory analysis of the invention is as follows:
The main reason for causing hot rolled ribbed bars non-yield point aobvious is the over-cooling structures content such as bainite in tissue, martensite
It is higher.In the reinforcing bar containing niobium, the main function of niobium is crystal grain refinement, precipitation strength and phase transformation strengthening, and phase transformation strengthening is main
It is that niobium increases stabilization of austenite, is easy to get the over-cooling structures such as bainite；In order to make hot-rolled reinforced bar apparent surrender occur
Point needs to obtain ferrite+pearlitic structrure of higher volume fraction, simultaneously, it is necessary to reduce the over-cooling structures such as bainite to the greatest extent
Content therefore, it is necessary to play the beneficial effect of niobium crystal grain refinement, precipitation strength as far as possible, and weakens the phase transformation strengthening effect of niobium, keeps away
Exempt from or reduce the appearance of bainite structure, so that hot-rolled reinforced bar be made apparent yield point occur.
It, need to be to heating temperature, upper cold bed temperature in order to give full play to the refinement crystal grain and precipitation strength beneficial effect of niobium element
Degree etc. carries out priority control；If heating temperature is too low, the content of niobium that when heating is solid-solution in austenite is reduced, and is unfavorable for playing it
Refinement crystal grain and precipitation strength effect in rolling and cooling procedure, and with the increase of content of niobium, it is desirable that higher heating
Temperature just can guarantee the solid solution of niobium；If heating temperature is excessively high, the carbon nitrogen of the not molten niobium due to hindering Austenite Grain Growth
Compound is reduced, and AUSTENITE GRAIN COARSENING will finally be unfavorable for the refinement of tissue；On the other hand, heating temperature is excessively high, will lead to solid
Molten content of niobium improves, and the increase for being dissolved niobium can enhance the stability of austenite, promotes the formation of the low temperature phase changes products such as bainite,
Stress strain curve is set to occur surrendering unobvious phenomenon, it is therefore necessary to guarantee reasonable heating temperature；The height of temperature on cooling table represents
Austenite grain size size, lower temperature on cooling table are conducive to obtain tiny austenite grain, play crystal grain refinement
Effect.The present invention has finally determined that the critical process such as reasonable heating temperature, temperature on cooling table are joined by bulk trial
Number.
The invention has the benefit that
Using the production method of the invention, the stress strain curve infinited-valued logic phenomenon of hot rolled ribbed bars containing niobium can completely avoid, fit
Close stable mass production hot rolled ribbed bars containing niobium.Meanwhile compared with prior art, the present invention does not consider environment temperature, work
Skill is adaptable, and heating temperature is higher, can roll at high temperature, reduce mill load, is conducive to improve production effect
Rate；In addition, start rolling temperature can be by high-temperature control, and after roughing, rolled blank passes through in the reciprocal of roller-way as roughing machine utilization is small
Movement, is cooled to after zone of reasonableness and carries out continuous rolling again, be not required to refine crystal grain by the rapid cooling of water after rolling, to cold
But the Capability Requirement of equipment is lower, and surface layer is without thin crystal layer, and tissue is not only ferrite+pearlite, and structural homogenity is preferable.
Detailed description of the invention
Fig. 1 is the metallographic structure figure (200 times) of 1 hot rolled ribbed bars of embodiment；
Fig. 2 is the metallographic structure figure (200 times) of 2 hot rolled ribbed bars of embodiment；
Fig. 3 is the metallographic structure figure (200 times) of 3 hot rolled ribbed bars of embodiment；
Fig. 4 is the metallographic structure figure (200 times) of 4 hot rolled ribbed bars of embodiment；
Fig. 5 is the metallographic structure figure (200 times) of 5 hot rolled ribbed bars of embodiment；
Fig. 6 is the metallographic structure figure (200 times) of 6 hot rolled ribbed bars of embodiment.
Specific embodiment
Below by specific embodiment, 1~6 couple of present invention is described in further details.
Steel billet containing niobium in Examples 1 to 6 controls 1050~1250 DEG C of billet heating temperature by bar heating furnace,
1100~1250 DEG C of hot temperature, is then rolled, and controls 1000~1150 DEG C of start rolling temperature；When start rolling temperature be 1000~
At 1100 DEG C, back is rolled into the reinforcing bar that diameter is 20~36mm through continuous rolling, then water cooled, controls temperature on cooling table
920~980 DEG C；When 1000 DEG C of start rolling temperature≤1150 DEG C <, after premenstrual 3 rolling mill rolling, rolled blank is cooled to through roller-way
After 940~980 DEG C, through continuous rolling, it is rolled into the reinforcing bar of 20~36mm, it is then water cooled, control temperature on cooling table 920~
980℃.Reinforcing bar enters natural cooling after cold bed, then shearing, bundling, storage.
Technological parameter and the stress strain curve statistics of Examples 1 to 6 are listed in Table 1 below.
1 technological parameter of table and stress strain curve statistical conditions
Claims (6)
1. preventing the production method of the no remarkable yield point of hot rolled ribbed bars containing niobium, main includes heating, rolling, cooling process；
It is characterized by: heating temperature is 1050~1250 DEG C in the heating process, soaking temperature is 1100~1250 DEG C；It is described
The start rolling temperature of rolling process is 1000~1150 DEG C；The temperature on cooling table of the cooling process is 920~980 DEG C.
2. the production method of the prevention no remarkable yield point of hot rolled ribbed bars containing niobium as described in claim 1, it is characterised in that:
In rolling process when start rolling temperature is 1000~1100 DEG C, rolled blank, at reinforcing bar, is then cooled by water through continuous rolling, control
Temperature on cooling table is 920~980 DEG C；When 1100 DEG C of start rolling temperature≤1150 DEG C <, rolled blank first carries out 3 rolling mill rollings,
Rolled blank is cooled to 940~980 DEG C through roller-way later, then carries out continuous rolling into reinforcing bar, is then cooled by water, cold in control
Bed tempertaure is 920~980 DEG C.
3. the production method of the prevention no remarkable yield point of hot rolled ribbed bars containing niobium, feature exist as claimed in claim 1 or 2
In: the content of niobium of the hot rolled ribbed bars is 0.01~0.04wt%.
4. the production method of the prevention no remarkable yield point of hot rolled ribbed bars containing niobium, feature exist as claimed in claim 1 or 2
In: the hot rolled ribbed bars are the vertical bar bar of 20~36mm of diameter.
5. the production method of the prevention no remarkable yield point of hot rolled ribbed bars containing niobium as claimed in claim 2, it is characterised in that:
When 1100 DEG C of start rolling temperature≤1150 DEG C <, for rolled blank after the rolling of 3 rolling mills, the mode of rolling blank roller way cooling is in roller
It is moved back and forth on road, rolled blank is made to be cooled to 940~980 DEG C, then carry out continuous rolling.
6. the production method of the prevention no remarkable yield point of hot rolled ribbed bars containing niobium, feature exist as claimed in claim 1 or 2
In: the microscopic structure of the hot rolled ribbed bars is mainly ferrite+pearlite, and ferrite+pearlite accounts for the face of microscopic structure
Product percentage >=98%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811549673.7A CN109735699B (en) | 2018-12-18 | 2018-12-18 | Production method for preventing niobium-containing hot-rolled ribbed steel bar from having no obvious yield point |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811549673.7A CN109735699B (en) | 2018-12-18 | 2018-12-18 | Production method for preventing niobium-containing hot-rolled ribbed steel bar from having no obvious yield point |
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| Publication Number | Publication Date |
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| CN109735699A true CN109735699A (en) | 2019-05-10 |
| CN109735699B CN109735699B (en) | 2021-05-14 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110684931A (en) * | 2019-10-24 | 2020-01-14 | 柳州钢铁股份有限公司 | Control method for non-yield phenomenon of niobium microalloyed HRB400E hot-rolled ribbed steel bar |
| CN111014287A (en) * | 2019-12-23 | 2020-04-17 | 新疆八一钢铁股份有限公司 | Production method of niobium-containing ribbed steel bar |
| CN113385533A (en) * | 2021-05-21 | 2021-09-14 | 山东莱钢永锋钢铁有限公司 | Controlled rolling and controlled cooling production method for green small-specification HRB500E steel bars |
| CN117144253A (en) * | 2023-09-07 | 2023-12-01 | 中信金属股份有限公司 | Niobium microalloyed hot rolled ribbed steel bar and production method thereof |
| CN117144253B (en) * | 2023-09-07 | 2024-04-30 | 中信金属股份有限公司 | Niobium microalloyed hot rolled ribbed steel bar and production method thereof |
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| CN102732787A (en) * | 2012-07-20 | 2012-10-17 | 江苏省沙钢钢铁研究院有限公司 | 600MPa level quake-proof twisted steel and manufacturing method thereof |
| CN108342641A (en) * | 2018-01-11 | 2018-07-31 | 河钢股份有限公司承德分公司 | A kind of 630MPa grades of hot rolling high-strength quake-proof reinforcing steel bar and its production method |
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| CN101185938A (en) * | 2006-11-09 | 2008-05-28 | 钢铁研究总院 | Method for producing steel bar with rib |
| CN101255492A (en) * | 2008-01-02 | 2008-09-03 | 马鞍山钢铁股份有限公司 | Production method for preventing no remarkable yield point of niobium micro-alloyed hot-rolled rib steel bar |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110684931A (en) * | 2019-10-24 | 2020-01-14 | 柳州钢铁股份有限公司 | Control method for non-yield phenomenon of niobium microalloyed HRB400E hot-rolled ribbed steel bar |
| CN110684931B (en) * | 2019-10-24 | 2020-11-27 | 柳州钢铁股份有限公司 | Control method for non-yield phenomenon of niobium microalloyed HRB400E hot-rolled ribbed steel bar |
| CN111014287A (en) * | 2019-12-23 | 2020-04-17 | 新疆八一钢铁股份有限公司 | Production method of niobium-containing ribbed steel bar |
| CN111014287B (en) * | 2019-12-23 | 2021-10-01 | 新疆八一钢铁股份有限公司 | Production method of niobium-containing ribbed steel bar |
| CN113385533A (en) * | 2021-05-21 | 2021-09-14 | 山东莱钢永锋钢铁有限公司 | Controlled rolling and controlled cooling production method for green small-specification HRB500E steel bars |
| CN117144253A (en) * | 2023-09-07 | 2023-12-01 | 中信金属股份有限公司 | Niobium microalloyed hot rolled ribbed steel bar and production method thereof |
| CN117144253B (en) * | 2023-09-07 | 2024-04-30 | 中信金属股份有限公司 | Niobium microalloyed hot rolled ribbed steel bar and production method thereof |
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| CN109735699B (en) | 2021-05-14 |
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Effective date of registration: 20240319 Address after: 056015 Fuxing Road 232, Fuxing District, Hebei, Handan Patentee after: HANDAN IRON & STEEL GROUP Co.,Ltd. Country or region after: Zhong Guo Patentee after: Handan Branch of Hegang Co.,Ltd. Country or region after: China Patentee after: Hangang Nengjia Steel Co.,Ltd. Address before: 056015 Fuxing Road 232, Fuxing District, Hebei, Handan Patentee before: HANDAN IRON & STEEL GROUP Co.,Ltd. Country or region before: Zhong Guo Patentee before: Handan Branch of Hegang Co.,Ltd. |