CN104946980B - TMCP and tempering type 550 Mpa-level corrosion resistant bridge steel and production method thereof - Google Patents
TMCP and tempering type 550 Mpa-level corrosion resistant bridge steel and production method thereof Download PDFInfo
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Abstract
The invention discloses TMCP and tempering type 550 Mpa-level corrosion resistant bridge steel and a production method thereof. The bridge steel comprises the following chemical components in percentage by weight: 0.05-0.10% of C, 0.05-0.20% of Si, 0.95-1.65% of Mn, P not more than 0.030%, S not more than 0.005%, Cu not more than 0.80%, 0.040-0.10% of V, 0.020-0.040% of Nb, 0.020-0.050% of Al, 0.10-0.50% of W, Sn not more than 0.005%, Cev not more than 0.53%, and the balance of Fe and inevitable impurities, wherein Cev=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15. The production method comprises the procedures of converter smelting, LF refining, vacuum refining, pouring, heating, rolling, slow cooling and heat treatment. The mechanical performance of the steel totally satisfies the standard requirement of the TMCP and tempering type 550 Mpa-level corrosion resistant bridge steel, and has considerable surplus; and added noble metals are low in content, so that the production cost is lower.
Description
Technical field
The invention belongs to metallurgical technology field, especially a kind of TMCP+ tempering type 550Mpa rank corrosion resistant bridge steel steel
Plate and its production method.
Background technology
Bridge steel plate is mainly used in steel box-girder and Longspan Bridge steel construction, and its stress is complicated, it is desirable to safe and reliable
The good, long service life of property, antiseptic property are good, and the features such as frequent vibration limitses can be resisted.It is quick with bridge steel structure
Development, steel bridge over strait builds more and more, and the research and development of bridge steel are proposed with high intensity, high-weatherability, good weldability, low
The strict requirements such as warm good toughness, anti-lamellar tearing function admirable.
The development of China's Weather-resistance bridge steel is slower, and current bridge steel also rests on traditional Hi-Stren steel level
On, all there is the weakness that some cannot overcome, such as thickness of slab in such as 16Mnq, 15MnVq, 15MnVNq and 14MnNbq, these steel grades
Effect is serious, welding performance is bad, low strength, and does not possess good weather resistance.High-strength weather-proof bridge steel is made
For a branch of high-performance steel, the focus of World Iron ＆ Steel investigation of materials, the HPS- in such as U.S. ASTM709 are become in recent years
SMA570W Series Steels of 70W steel, HPS-100W steel and Japan etc..
According to the development concept of external high performance bridge steel, taking the lead at home, it is higher to have carried out corrosion resisting property for Wugang company
The research of high intensity bridge steel plate.Wugang high-strength bridge steel have low cost, high-performance, it is environmentally friendly the features such as, representative
The developing direction of Bridges in Our Country steel from now on.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of inexpensive, high performance TMCP+ tempering type 550Mpa rank
Corrosion resistant bridge steel and its production method.
To solve above-mentioned technical problem, the technical solution used in the present invention is：Its by following weight percent change
Study and be grouped into：C：0.05~0.10%, Si：0.05~0.20%, Mn：0.95~1.65%, P≤0.030%, S≤0.005%, Cu
≤ 0.80%, V：0.040~0.10%, Nb：0.020~0.040%, Al：0.020~0.050%, W：0.10~0.50%, Sn≤
0.005%th, Cev≤0.53%, balance of Fe and inevitable impurity, wherein Cev=C+Mn/6+（Cr+Mo+V）/5+（Ni+
Cu）/15.
Bridge steel of the present invention is organized as ferrite and tempering bainite.
Bridge steel thickness 8-60mm of the present invention.
The production method of TMCP+ tempering type 550Mpa rank corrosion resistant bridge steel of the present invention, including converter smelting, LF be smart
Refining, vacuum refining, cast, heating, rolling, slow cooling, heat treatment, the rolling process：Using II type controlled rolling process；First stage
Rolling temperature is 950~1100 DEG C, and this stage reduction in pass is 10~25%, and strong water is carried out using ultrafast cool equipment after rolling
It is cold so that steel billet temperature drops to 700~750 DEG C；Start rolling temperature≤720 DEG C of second stage, finishing temperature≤600 DEG C add up
Reduction ratio >=30%；Roll rear steel plate quickly to cool down, 250~350 DEG C of red temperature.
Heat treatment step of the present invention：350~450 DEG C of heating-up temperature, total 90~120min of heat time；After tempering,
Steel plate is through air cooling process.
Heating process of the present invention：Maximum heating temperature≤1230 DEG C, 1.2~3.5min/mm of firing rate, soaking zone
1200~1230 DEG C of temperature, 90~200min of soaking zone heat time.
The bridge steel plate Q500qNHE of the present invention adopts C-Mn-Cu-V-W-Sn systems microalloy element complex intensifying, with good
Good obdurability is matched and welding performance.The development of high-strength steel is the process for gradually reducing carbon content, the reduction of carbon content, a side
Face is conducive to improving the toughness of steel, on the other hand can significantly improve the welding performance of steel, in the present invention carbon content 0.05~
0.10%, it is suitable for the large-scale steel structure members for needing the stress of more high tenacity and welding performance complicated.Appropriate Cu can make in the present invention
Steel plate sample Jing long-time die welding process after, precipitation strength steel matrix；So as to avoid steel mould deposited strength index from declining
Hurry up.In 0.04~0.10%, V after controlled rolling, C, N compound of V is separated out V content, can strongly be improved steel plate and be obtained by force in the present invention
Degree.
A small amount of W, Sn can effectively improve the weather resistance of steel plate.
The inventive method adopts C-Mn-Cu-V-W-Sn systems microalloy element complex intensifying, through rational heat treatment work
Skill, obtains good obdurability matching, while and not reducing the welding performance of steel plate.Production realization is carried out using the inventive method
Relatively low carbon equivalent and the Design of Chemical Composition of microalloy content, strictly control heating strand, rolling and cooling parameter, steel plate
Jing after normalized treatment, every mechanical performance index of technical conditions requirement was not only obtained but also had reduced production cost, while obtaining
More tiny institutional framework and more preferably welding performance.
It is using the beneficial effect produced by above-mentioned technical proposal：The present invention takes C-Mn- in composition design
The mentality of designing of Cu-V-W-Sn, high-carbon, microalloy content are relatively low and with low cost；Tough matching, yield strength is in 600MPa
More than, tensile strength is less with plate difference in 760~890MPa or so, yield tensile ratio≤0.85, and steel plate；- 40 DEG C of vertical, horizontal impacts
Work(is more than 90 joules, and low-temperature good toughness, production cost is relatively low.
Description of the drawings
Fig. 1 is 100 microns of macrographs of steel plate of the present invention；
Fig. 2 is 20 microns of macrographs of steel plate of the present invention.
Specific embodiment
With reference to the accompanying drawings and detailed description the present invention is further detailed explanation.
Embodiment 1：This 550Mpa rank corrosion resistant bridge steel plates are produced using following methods：
（1）The chemical composition of steel billet（Weight）For：C 0.10%, Si 0.05%, Mn 1.64%, P 0.012%, S
0.002%, Cu 0.50%, V 0.075%, Nb 0.020%, Al 0.032%, W 0.45%, Sn 0.005%, balance of Fe and can not
The impurity for avoiding, Cev 0.42%.
（2）This 550Mpa rank corrosion resistant bridge Plate Productions thickness is 60mm.
（3）This 550Mpa rank corrosion resistant bridges steel plate using converter smelting, LF refining, vacuum refining, cast, heating,
Rolling, slow cooling, heat treatment step are produced, wherein heating, rolling, heat treatment step control technique it is as follows：
A, heating technique：1230 DEG C of maximum heating temperature, firing rate 1.5min/mm, soaking zone temperature 1200~1230
DEG C, soaking zone heat time 190min.
B, rolling mill practice：Using II type controlled rolling process；Using II type controlled rolling process, first stage rolling temperature is 1090
DEG C, this stage reduction in pass is 25%, carries out strong water-cooled using ultrafast cool equipment after rolling so that steel billet temperature drops to 750
℃；720 DEG C of the start rolling temperature of second stage, 580 DEG C of finishing temperature adds up reduction ratio 80%；Roll rear steel plate quickly to cool down, return red
250 DEG C of temperature.
C, Technology for Heating Processing：350 DEG C of heating-up temperature, total heat time 120min, you can obtain described 550Mpa ranks
Corrosion resistant bridge steel plate.
The organization chart of the present embodiment gained steel plate is shown in Fig. 1,2.From Fig. 1 and Fig. 2, this 550Mpa rank corrosion resistant bridge
Steel plate is organized as ferrite+tempering bainite, even tissue, and the grain size of tissue is 9.5 grades.
The conventional mechanical property of the present embodiment gained 550Mpa rank corrosion resistant bridge steel plates：Yield strength 600MPa；It is anti-
Tensile strength：795MPa；Yield tensile ratio 0.75；Extend：22%；- 40 DEG C of ballistic work AKV（Laterally）73、89、102J.
Embodiment 2：This 550Mpa rank corrosion resistant bridge steel plates are produced using following methods：
（1）The chemical composition of steel billet（Weight）For：C 0.07%, Si 0.13%, Mn 1.40%, P 0.020%, S
0.002%, Cu 0.70%, V 0.095%, Nb 0.040%, Al 0.050%, W 0.10%, Sn 0.003%, balance of Fe and can not
The impurity for avoiding, Cev 0.36%.
（2）This 550Mpa rank corrosion resistant bridge Plate Productions thickness is 40mm.
（3）This 550Mpa rank corrosion resistant bridges steel plate using converter smelting, LF refining, vacuum refining, cast, heating,
Rolling, slow cooling, heat treatment step are produced, wherein heating, rolling, heat treatment step control technique it is as follows：
A, heating technique：1220 DEG C of maximum heating temperature, firing rate 3.5min/mm, soaking zone temperature 1210~1230
DEG C, soaking zone heat time 120min.
B, rolling mill practice：Using II type controlled rolling process；Using II type controlled rolling process, first stage rolling temperature is 1000
DEG C, this stage reduction in pass is 20%, carries out strong water-cooled using ultrafast cool equipment after rolling so that steel billet temperature drops to 730
℃；700 DEG C of the start rolling temperature of second stage, 500 DEG C of finishing temperature adds up reduction ratio 65%；Roll rear steel plate quickly to cool down, return red
300 DEG C of temperature.
C, Technology for Heating Processing：400 DEG C of steel plate heating-up temperature, total heat time 100min, you can obtain described 550Mpa
Rank corrosion resistant bridge steel plate.
This 550Mpa rank corrosion resistant bridge steel plates are organized as ferrite+tempering bainite, even tissue, the crystal grain of tissue
Spend for 10 grades.
The conventional mechanical property of the present embodiment gained 550Mpa rank corrosion resistant bridge steel plates：Yield strength 610MPa；It is anti-
Tensile strength：815MPa；Yield tensile ratio 0.74；Extend：23%；- 40 DEG C of ballistic work AKV（Laterally）113、109、122J.
Embodiment 3：This 550Mpa rank corrosion resistant bridge steel plates are produced using following methods：
（1）The chemical composition of steel billet（Weight）For：C 0.07%, Si 0.17%, Mn 1.05%, P 0.022%, S
0.001%, Cu 0.30%, V 0.045%, Nb 0.020%, Al 0.032%, W 0.25%, Sn 0.002%, balance of Fe and can not
The impurity for avoiding, Cev 0.27%.
（2）This 550Mpa rank corrosion resistant bridge Plate Productions thickness is 20mm.
（3）This 550Mpa rank corrosion resistant bridges steel plate using converter smelting, LF refining, vacuum refining, cast, heating,
Rolling, slow cooling, heat treatment step are produced, wherein heating, rolling, heat treatment step control technique it is as follows：
A, heating technique：1150 DEG C of maximum heating temperature, firing rate 2.5min/mm, soaking zone temperature 1200~1230
DEG C, soaking zone heat time 300min.
B, rolling mill practice：Using II type controlled rolling process；Using II type controlled rolling process, first stage rolling temperature is 1000
DEG C, this stage reduction in pass is 15%, carries out strong water-cooled using ultrafast cool equipment after rolling so that steel billet temperature drops to 710
℃；690 DEG C of the start rolling temperature of second stage, 520 DEG C of finishing temperature adds up reduction ratio 72%；Roll rear steel plate quickly to cool down, return red
350 DEG C of temperature.
C, Technology for Heating Processing：400 DEG C of heating-up temperature, total heat time 100min, you can obtain described 550Mpa ranks
Corrosion resistant bridge steel plate.
This 550Mpa rank corrosion resistant bridge steel plates are organized as ferrite+tempering bainite, even tissue, the crystal grain of tissue
Spend for 11 grades.
The conventional mechanical property of the present embodiment gained 550Mpa rank corrosion resistant bridge steel plates：Yield strength 590MPa；It is anti-
Tensile strength：805MPa；Yield tensile ratio 0.73；Extend：24%；- 40 DEG C of ballistic work AKV（Laterally）123、119、133J.
Embodiment 4：This 550Mpa rank corrosion resistant bridge steel plates are produced using following methods：
（1）The chemical composition of steel billet（Weight）For：C 0.05%, Si 0.05%, Mn 0.98%, P 0.020%, S
0.002%, Cu 0.50%, V 0.045%, Nb 0.020%, Al 0.030%, W 0.15%, Sn 0.004%, balance of Fe and can not
The impurity for avoiding, Cev 0.25%.
（2）This 550Mpa rank corrosion resistant bridge Plate Productions thickness is 8mm.
（3）This 550Mpa rank corrosion resistant bridges steel plate using converter smelting, LF refining, vacuum refining, cast, heating,
Rolling, slow cooling, heat treatment step are produced, wherein heating, rolling, heat treatment step control technique it is as follows：
A, heating technique：1200 DEG C of maximum heating temperature, firing rate 1.5min/mm, soaking zone temperature 1210~1230
DEG C, soaking zone heat time 90min.
B, rolling mill practice：Using II type controlled rolling process；Using II type controlled rolling process, first stage rolling temperature is 950 DEG C,
This stage reduction in pass is 10%, carries out strong water-cooled using ultrafast cool equipment after rolling so that steel billet temperature drops to 740 DEG C；The
720 DEG C of the start rolling temperature of two-stage, 580 DEG C of finishing temperature adds up reduction ratio 85%；Roll rear steel plate quickly to cool down, red temperature
280℃。
C, Technology for Heating Processing：370 DEG C of steel plate heating-up temperature, total heat time 90min, you can obtain described 550Mpa levels
Other corrosion resistant bridge steel plate.
This 550Mpa rank corrosion resistant bridge steel plates are organized as ferrite+tempering bainite, even tissue, the crystal grain of tissue
Spend for 10 grades.
The conventional mechanical property of the present embodiment gained 550Mpa rank corrosion resistant bridge steel plates：Yield strength 630MPa；It is anti-
Tensile strength：795MPa；Yield tensile ratio 0.79；Extend：20%；- 40 DEG C of ballistic work AKV（Laterally）103、110、112J.
Embodiment 5：This 550Mpa rank corrosion resistant bridge steel plates are produced using following methods：
（1）The chemical composition of steel billet（Weight）For：C 0.03%, Si 0.20%, Mn 0.95%, P 0.030%, S
0.004%, Cu 0.80%, V 0.10%, Nb 0.033%, Al 0.020%, W 0.50%, Sn0.005%, balance of Fe and can not keep away
The impurity exempted from, Cev 0.25%.
（2）This 550Mpa rank corrosion resistant bridge Plate Productions thickness is 15mm.
（3）This 550Mpa rank corrosion resistant bridges steel plate using converter smelting, LF refining, vacuum refining, cast, heating,
Rolling, slow cooling, heat treatment step are produced, wherein heating, rolling, heat treatment step control technique it is as follows：
A, heating technique：1195 DEG C of maximum heating temperature, firing rate 1.3min/mm, soaking zone temperature 1210~1230
DEG C, soaking zone heat time 90min.
B, rolling mill practice：Using II type controlled rolling process；Using II type controlled rolling process, first stage rolling temperature is 980 DEG C,
This stage reduction in pass is 12%, carries out strong water-cooled using ultrafast cool equipment after rolling so that steel billet temperature drops to 710 DEG C；The
710 DEG C of the start rolling temperature of two-stage, 500 DEG C of finishing temperature adds up reduction ratio 30%；Roll rear steel plate quickly to cool down, red temperature
295℃。
C, Technology for Heating Processing：405 DEG C of steel plate heating-up temperature, total heat time 105min, you can obtain described 550Mpa
Rank corrosion resistant bridge steel plate.
This 550Mpa rank corrosion resistant bridge steel plates are organized as ferrite+tempering bainite, even tissue, the crystal grain of tissue
Spend for 11 grades.
The conventional mechanical property of the present embodiment gained 550Mpa rank corrosion resistant bridge steel plates：Yield strength
610MPa；Tensile strength：815MPa；Yield tensile ratio 0.75；Extend：30%；- 40 DEG C of ballistic work AKV（Laterally）155J、
175J、182J。
Embodiment 6：This 550Mpa rank corrosion resistant bridge steel plates are produced using following methods：
（1）The chemical composition of steel billet（Weight）For：C 0.08%, Si 0.09%, Mn 1.65%, P 0.011 %, S
0.002%, Cu 0.10%, V 0.040%, Nb 0.020%, Al 0.045%, W 0.30%, Sn 0.000%, balance of Fe and can not
The impurity for avoiding, Cev 0.36%.
（2）This 550Mpa rank corrosion resistant bridge Plate Productions thickness is 28mm.
（3）This 550Mpa rank corrosion resistant bridges steel plate using converter smelting, LF refining, vacuum refining, cast, heating,
Rolling, slow cooling, heat treatment step are produced, wherein heating, rolling, heat treatment step control technique it is as follows：
A, heating technique：1180 DEG C of maximum heating temperature, firing rate 1.6min/mm, soaking zone temperature 1210~1230
DEG C, soaking zone heat time 90min.
B, rolling mill practice：Using II type controlled rolling process；Using II type controlled rolling process, first stage rolling temperature is 990 DEG C,
This stage reduction in pass is 15%, carries out strong water-cooled using ultrafast cool equipment after rolling so that steel billet temperature drops to 725 DEG C；The
715 DEG C of the start rolling temperature of two-stage, 530 DEG C of finishing temperature adds up reduction ratio 45%；Roll rear steel plate quickly to cool down, red temperature
335℃。
C, Technology for Heating Processing：415 DEG C of steel plate heating-up temperature, total heat time 115min, you can obtain described 550Mpa
Rank corrosion resistant bridge steel plate.
This 550Mpa rank corrosion resistant bridge steel plates are organized as ferrite+tempering bainite, even tissue, the crystal grain of tissue
Spend for 10 grades.
The conventional mechanical property of the present embodiment gained 550Mpa rank corrosion resistant bridge steel plates：Yield strength 590MPa；It is anti-
Tensile strength：790MPa；Yield tensile ratio 0.75；Extend：32%；- 40 DEG C of ballistic work AKV（Laterally）126J、133J、142J.
Claims (9)
1. a kind of TMCP+ tempering type 550MPa rank corrosion resistant bridge steel, it is characterised in that it is by following weight percent
Chemical composition composition：C：0.05~0.10%, Si：0.05~0.20%, Mn：0.95~1.65%, P≤0.030%, S≤
0.005%, Cu≤0.80%, V：0.040~0.10%, Nb：0.020~0.040%, Al：0.020~0.050%, W：0.10~
0.50%, Sn≤0.005%, Cev≤0.53%, balance of Fe and inevitable impurity, wherein Cev=C+Mn/6+（Cr+Mo+
V）/5+（Ni+Cu）/15；The bridge steel is organized as ferrite and tempering bainite.
2. a kind of TMCP+ tempering type 550MPa rank corrosion resistant bridge steel according to claim 1, it is characterised in that：Institute
State bridge steel thickness 8-60mm.
3. a kind of TMCP+ tempering type 550MPa rank corrosion resistant bridge steel according to claim 1, it is characterised in that：Its
It is made up of the chemical composition of following weight percent：C 0.07%, Si 0.13%, Mn 1.40%, P 0.020%, S 0.002%,
Cu 0.70%, V 0.095%, Nb 0.040%, Al 0.050%, W 0.10%, Sn 0.003%, balance of Fe and inevitably
Impurity, Cev 0.36%.
4. a kind of TMCP+ tempering type 550MPa rank corrosion resistant bridge steel according to claim 1, it is characterised in that：Its
It is made up of the chemical composition of following weight percent：C 0.07%, Si 0.17%, Mn 1.05%, P 0.022%, S
0.001%, Cu 0.30%, V 0.045%, Nb 0.020%, Al 0.032%, W 0.25%, Sn 0.002%, balance of Fe and can not
The impurity for avoiding, Cev 0.27%.
5. a kind of TMCP+ tempering type 550MPa rank corrosion resistant bridge steel according to claim 1, it is characterised in that：Its
It is made up of the chemical composition of following weight percent：C 0.05%, Si 0.05%, Mn 0.98%, P 0.020%, S 0.002%,
Cu 0.50%, V 0.045%, Nb 0.020%, Al 0.030%, W 0.15%, Sn 0.004%, balance of Fe and inevitably
Impurity, Cev 0.25%.
6. a kind of production method of the TMCP+ tempering type 550MPa rank corrosion resistant bridge steel being based on described in claim 1 or 2,
Including converter smelting, LF refining, vacuum refining, cast, heating, rolling, slow cooling, heat treatment, it is characterised in that the rolling work
Sequence：Using II type controlled rolling process；First stage rolling temperature is 950~1100 DEG C, and this stage reduction in pass is 10~25%,
Strong water-cooled is carried out after rolling using ultrafast cool equipment so that steel billet temperature drops to 700~750 DEG C；The start rolling temperature of second stage
≤ 720 DEG C, finishing temperature≤600 DEG C add up reduction ratio >=30%；Roll rear steel plate quickly to cool down, 250~350 DEG C of red temperature；
The heat treatment step：350~450 DEG C of heating-up temperature, total 90~120min of heat time；After tempering, steel plate is at air cooling
Reason；The heating process：Maximum heating temperature≤1230 DEG C, 1.2~3.5min/mm of firing rate, soaking zone temperature 1200~
1230 DEG C, 90~200min of soaking zone heat time.
7. the production method of TMCP+ tempering type 550MPa rank corrosion resistant bridge steel according to claim 3, adopts and turns
Stove smelting, LF refining, vacuum refining, cast, heating, rolling, slow cooling, heat treatment step are produced, it is characterised in that steel plate
Production thickness is 40mm, and its heating, rolling, heat treatment step control technique are as follows：
A, heating technique：1220 DEG C of maximum heating temperature, firing rate 3.5min/mm, 1210~1230 DEG C of soaking zone temperature,
Hot arc heat time 120min；
B, rolling mill practice：Using II type controlled rolling process；Using II type controlled rolling process, first stage rolling temperature is 1000 DEG C, this
Stage reduction in pass is 20%, carries out strong water-cooled using ultrafast cool equipment after rolling so that steel billet temperature drops to 730 DEG C；Second
700 DEG C of the start rolling temperature in stage, 500 DEG C of finishing temperature adds up reduction ratio 65%；Roll rear steel plate quickly to cool down, red temperature 300
℃；
C, Technology for Heating Processing：400 DEG C of steel plate heating-up temperature, total heat time 100min obtains described 550MPa rank corrosion resistants
Erosion bridge steel plate；
The steel plate is organized as ferrite+tempering bainite, and the grain size of tissue is 10 grades, mechanical property：Yield strength
610MPa；Tensile strength：815MPa；Yield tensile ratio 0.74；Extend：23%；- 40 DEG C of side knock work(AKV113,109,122J.
8. the production method of TMCP+ tempering type 550MPa rank corrosion resistant bridge steel according to claim 4, adopts and turns
Stove smelting, LF refining, vacuum refining, cast, heating, rolling, slow cooling, heat treatment step are produced, it is characterised in that steel plate
Production thickness is 20mm, and its heating, rolling, heat treatment step control technique are as follows：
A, heating technique：1150 DEG C of maximum heating temperature, firing rate 2.5min/mm, 1200~1230 DEG C of soaking zone temperature,
Hot arc heat time 300min；
B, rolling mill practice：Using II type controlled rolling process；Using II type controlled rolling process, first stage rolling temperature is 1000 DEG C, this
Stage reduction in pass is 15%, carries out strong water-cooled using ultrafast cool equipment after rolling so that steel billet temperature drops to 710 DEG C；Second
690 DEG C of the start rolling temperature in stage, 520 DEG C of finishing temperature adds up reduction ratio 72%；Roll rear steel plate quickly to cool down, red temperature 350
℃；
C, Technology for Heating Processing：400 DEG C of heating-up temperature, total heat time 100min obtains the described corrosion-resistant bridge of 550MPa ranks
Joist steel plate；
The steel plate is organized as ferrite+tempering bainite, even tissue, and the grain size of tissue is 11 grades；Mechanical property：Bend
Take intensity 590MPa；Tensile strength：805MPa；Yield tensile ratio 0.73；Extend：24%；- 40 DEG C of side knock work(AKV123,119,
133J。
9. the production method of TMCP+ tempering type 550MPa rank corrosion resistant bridge steel according to claim 5, adopts and turns
Stove smelting, LF refining, vacuum refining, cast, heating, rolling, slow cooling, heat treatment step are produced, it is characterised in that
Plate Production thickness is 8mm, and its heating, rolling, heat treatment step control technique are as follows：
This 550MPa rank corrosion resistant bridges steel plate is using converter smelting, LF refining, vacuum refining, cast, heating, rolling, slow
Hot and cold treatment process is produced, wherein heating, rolling, heat treatment step control technique it is as follows：
A, heating technique：1200 DEG C of maximum heating temperature, firing rate 1.5min/mm, 1210~1230 DEG C of soaking zone temperature,
Hot arc heat time 90min；
B, rolling mill practice：Using II type controlled rolling process；Using II type controlled rolling process, first stage rolling temperature is 950 DEG C, this rank
Section reduction in pass is 10%, carries out strong water-cooled using ultrafast cool equipment after rolling so that steel billet temperature drops to 740 DEG C；Second-order
720 DEG C of the start rolling temperature of section, 580 DEG C of finishing temperature adds up reduction ratio 85%；Roll rear steel plate quickly to cool down, 280 DEG C of red temperature；
C, Technology for Heating Processing：370 DEG C of steel plate heating-up temperature, total heat time 90min obtains described 550MPa rank corrosion resistants
Erosion bridge steel plate；
The steel plate is organized as ferrite+tempering bainite, even tissue, and the grain size of tissue is 10 grades；Mechanical property：Surrender
Intensity 630MPa；Tensile strength：795MPa；Yield tensile ratio 0.79；Extend：20%；- 40 DEG C of side knock work(AKV103,110,
112J。
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| CN105779883A (en) * | 2016-05-06 | 2016-07-20 | 舞阳钢铁有限责任公司 | 485MPa level TMCP+ tempering weather-proof bridge steel plate and production method |
| CN105950849A (en) * | 2016-05-27 | 2016-09-21 | 舞阳钢铁有限责任公司 | Production process of 690 MPa-grade high-strength steel plate with low yield ratio |
| CN107326304A (en) * | 2017-06-22 | 2017-11-07 | 舞阳钢铁有限责任公司 | A kind of TMCP types surrender 500MPa grades of bridge steel plates and production method |
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