CN104164621A - Extremely thick bridge anchor steel-plate with low compression ratio and production method - Google Patents
Extremely thick bridge anchor steel-plate with low compression ratio and production method Download PDFInfo
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- CN104164621A CN104164621A CN201410359361.5A CN201410359361A CN104164621A CN 104164621 A CN104164621 A CN 104164621A CN 201410359361 A CN201410359361 A CN 201410359361A CN 104164621 A CN104164621 A CN 104164621A
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Abstract
The invention discloses an extremely thick bridge anchor steel-plate with low compression ratio. According to the steel-plate, thickness is 160-190 mm and compression ratio is 1.58-1.87. The steel-plate contains the following chemical components, by weight, 0.14-0.18% of C, 0.33-0.5% of Si, 1.25-1.55% of Mn, P being less than or equal to 0.012%, S being less than or equal to 0.004%, Nb being less than or equal to 0.03-0.06%, 0.035-0.055% of V, 0.35-0.55% of Ni, N being less than or equal to 0.008, 0.015-0.04% of Als and the balance Fe and unavoidable inclusions. Carbon equivalent is less than or equal to 0.45. The invention also discloses a production method of the steel-plate, comprising the following steps: converter smelting, LF furnace and RH furnace refining, continuous casting, first hot rolling, second hot rolling, slow cooling and the like. According to the bridge anchor steel-plate, yield strength is greater than or equal to 360 MPa, tensile strength is greater than or equal to 500 MPa, ductility is greater than or equal to 25%, impact energy at minus 20 DEG C is greater than or equal to 160 J, primary flaw inspection is qualified, Z-direction tensile fracture shrinkage can reach Z25 level, and Charpy impact energy at minus 40 DEG C (V-shaped gap) is more than 100 J.
Description
Technical field
The present invention relates to bridge steel plate, concrete is a kind of thick bridge anchor of spy pading plate of low compression ratio, the invention still further relates to the production method of this steel plate.
Background technology
Be accompanied by the progress of era development, science and technology, Bridge Design has adopted renewal, more scientific method of design, and design entirety is to large span, the future developments such as high percent of pass (large bearing load and bridge deck width), overlength active time, therefore, also more and more higher to the requirement of bridge steel plate.Particularly the partial component of bridge structure is also developed towards high strength, high tenacity, large thickness direction.Wherein the bridge main body of steel construction is configured to a steel anchor box, and steel anchor box consist of side plate, end plate, supporting plate, bearing plate, anchor plate, transverse wall and stiffener etc.As the important component part of steel anchor box, anchor plate plays a part crucial, and its Main Function is fixing ground tackle.And along with the development of bridge technology, large-tonnage ground tackle be applied in continuous increase, therefore also need the anchor plate of large thickness to deepen the fixing of ground tackle.
For the thick bridge steel plate of spy, utilize continuously cast bloom generally all only to produce the steel plate below 130mm thickness before, if produce the steel plate of thickness more than 160mm, need to adopt the mode being rolled after molten steel ingot casting to carry out.Adopt this ingot ways to produce, and production and the use of thick specification bridge steel plate that need to adopt the effects limit such as thermal treatment improves the high tenacity of steel plate, and the lumber recovery of ingot casting is low, and quality is inhomogeneous, thermal treatment cost height.
CN101880824A discloses a kind of Q345q special thick bridge steel plate of series and production method thereof, and the maximum ga(u)ge of this steel plate is 130mm, is to adopt ingot casting blank to produce.CN102337456A discloses a kind of thick specification bridge steel plate and rolling method thereof, adopts continuous casting steel billet production technique to obtain the steel plate of 60-80mm.The bridge steel plate that above-mentioned prior art is produced not only thickness does not reach requirement, and compression ratio is high, complex process, and production cost is high.
Summary of the invention
The object of this invention is to provide a kind of thickness at 160-190mm, the spy of low compression ratio thick bridge anchor pading plate and production method thereof.
Above-mentioned purpose is achieved through the following technical solutions:
A kind of thick bridge anchor of spy pading plate of low compression ratio, its thickness is 160-190mm, compression ratio is 1.58-1.87, its chemical composition is by weight percentage: C:0.14-0.18%, Si:0.33-0.5%, Mn:1.25-1.55%, P :≤0.012%, S :≤0.004%, Nb≤0.03-0.06%, V:0.035-0.055%, Ni:0.35-0.55%, N≤0.008, Als (acid-soluble aluminium): 0.015-0.04%, and all the other are Fe and are inevitably mingled with; Carbon equivalent≤0.45.
The reason of its chemical composition design is:
C:0.14-0.18%, C is one of element of indispensable raising steel strength, and every increase by 0.1% tensile strength of carbon content approximately improves 60MPa, and yield strength approximately improves 20-30MPa.Along with the increase of carbon content, steel grade Fe
3c increases, and hardenability also increases, and the tensile strength of steel and yield strength can improve, and plasticity and toughness index can decline, welding property variation.This steel grade, as the thick bridge anchor of spy pading plate, not only requires certain intensity, and needs excellent toughness index and welding property.This content has not only ensured the intensity of steel, and has ensured the use properties of this steel grade, is also applicable to production operation simultaneously.
Si:0.33-0.50%, Si mainly improves steel strength with solution strengthening form, is also the deoxidant element of steel grade.If but Si content is higher in steel, can cause that reduction of area declines, particularly impact toughness decreased, simultaneously also unfavorable to the weldability of steel.
Mn:1.25-1.55%, is guaranteeing that aspect the intensity and toughness of steel, Mn is indispensable element.For steel grade of the present invention, Mn mainly, to protect intensity as main, therefore selects Gao Meng.
P :≤0.012%, S :≤0.004%, this is because the P in steel, S content must be controlled at lower scope, only has smelting Clean Steel, the over-all properties of guarantee steel of the present invention.
Nb:0.03-0.06%, superheated susceptivity and the temper brittleness of niobium energy crystal grain thinning and reduction steel, improve intensity, but the plasticity of steel and toughness can decline to some extent.In ordinary low-alloy steel, add niobium, can improve anti-hydrogen under weather-resistant and high temperature, nitrogen, ammonia corrosion ability, niobium also can improve welding property.In austenitic stainless steel, add niobium, can prevent intergranular corrosion phenomenon.
V:0.035-0.055%, vanadium can enter in iron in endless solid solution, and stoping the growth of austenite crystal, vanadium has the ability of depickling deoxygenation in steel, therefore closely knit containing its section crystallization of steel of vanadium, in addition the effect of vanadium also has, can improve quenching temperature, improve sclerosis energy, when quench hot heating, can prevent its grain growing, help the crystal structure granular of what steel.
Ni:0.35-0.55%, Ni has certain strengthening effect, adds 1% Ni can improve steel strength 20MPa.Ni can also improve the toughness, particularly low-temperature flexibility of steel significantly, and steel grade adds Ni, is that base material or simulation welded heat affecting zone have all been improved low-temperature flexibility significantly, therefore, for the poor problem of the thick bridge anchor of spy pading plate low-temperature flexibility, has selected nickelic.
N :≤0.008%, steel grade N element is larger for the Toughness of steel plate, has therefore done the restriction of the upper limit.
Als:0.015-0.04%, crystal grain thinning, plays strengthening effect.
Carbon equivalent ce V=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15 :≤0.45, for ensureing the welding property of steel plate, its chemical composition should ensure that CEV is as far as possible little, should adopt low-carbon (LC) design.
The production method of the thick bridge anchor of described spy pading plate is further provided, and the method comprises that converter smelting, LF stove and the refining of RH stove, continuous casting become base, hot rolling for the first time, hot rolling for the second time, the several steps of slow cooling, wherein:
The Heating temperature of hot rolling is for the first time 1250-1280 DEG C, heating rate is 9-12min/cm (referring to that every heating 1cm base needs 9-12min), adopt the fast speed rolling of the thick continuous casting steel billet low temperature of 300mm, rolling temperature is 1050 DEG C, rolling pass is 4-6 passage, rolling mode adopts axial rolling on earth, is rolled into the slab that thickness is 220-250mm;
The Heating temperature of hot rolling is for the second time 1250-1280 DEG C, heating rate is 8-11min/cm, adopt two-stage rolling: one-phase rolling starts temperature≤1050 DEG C, passage is depressed more than 20mm/ road, be rolled into the slab that thickness is 200-230mm, object is to adopt low temperature to depress greatly fast and makes the abundant fragmentation of crystal grain and be delivered to slab heart portion; Two-stage rolling starts temperature between 920-940 DEG C, two-stage accumulative total passage 5-7 time, and being rolled into thickness is 160-190mm finished steel plate, the object of two-stage rolling is further crystal grain thinning, improves toughness and intensity.
Employing air cooling after two-stage rolling completes.
Preferably, in the time carrying out the refining of RH stove, controlling the Fruit storage time is not less than 15 minutes.
Although the special thick bridge steel plate of the Q345q of the present invention and CN101880824A series is same grade of steel, identical weave construction.But the maximum steel plate thickness of CN101880824A is 130mm, be to adopt ingot casting blank to produce, produce with maximum ga(u)ge 190mm of the present invention and the thick continuous casting steel billet of employing 300mm the huge difference that exists thickness and rolling compression ratio; CN101880824A also exists the different of technical process from the present invention simultaneously, and the former is TMCP+ thermal treatment process, and the present invention does not adopt thermal treatment process, but adopts twice slab hot rolling technology, and technique of the present invention is simpler, and flow process is shorter.
The invention has the beneficial effects as follows:
Compared with prior art, the present invention can provide a kind of thickness at 160-190mm, and compression ratio is at the bridge anchor pading plate of 1.58-1.87.Indices has reached yield strength >=360MPa, tensile strength >=500MPa, unit elongation >=25%,-20 DEG C of ballistic work >=160J, one-level flaw detection is simultaneously qualified, and the relative reduction in area of Z-direction stretching simultaneously can reach Z25 rank, and-40 DEG C of Charpy-V impact powers (v-notch) are more than 100J.
Secondly, the production technique of bridge anchor pading plate provided by the invention is simple, and cost is low.
Brief description of the drawings
Fig. 1 is the internal optics micro-organization chart of bridge anchor pading plate of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail.
Embodiment 1-6
A kind of thick bridge anchor of spy pading plate of low compression ratio, its thickness is 160-190mm, compression ratio is 1.58-1.87, its chemical composition is C:0.14-0.18%, Si:0.33-0.5%, Mn:1.25-1.55%, P by weight percentage :≤0.012%, S :≤0.004%, Nb≤0.03-0.06%, V:0.035-0.055%, Ni:0.35-0.55%, N≤0.008, Als:0.015-0.04%, and all the other are Fe and are inevitably mingled with; Carbon equivalent≤0.45.
The production method of the thick bridge anchor of the spy pading plate of described low compression ratio comprises that converter smelting, LF stove and the refining of RH stove, continuous casting become base, hot rolling for the first time, hot rolling for the second time, the several steps of slow cooling, wherein:
In the time carrying out the refining of RH stove, controlling the Fruit storage time is not less than 15 minutes; In the steel billet making, O, N, H, P, S are controlled at below 250ppm, non-metallic inclusion (A, B, C, D) is comprehensive≤and 2.5 grades, chemical composition is according to following control: C:0.14-0.18%, Si:0.33-0.5%, Mn:1.25-1.55%, P :≤0.012%, S :≤0.004%, Nb≤0.03-0.06%, V:0.035-0.055%, Ni:0.35-0.55%, N≤0.008, Als:0.015-0.04%, all the other are Fe and are inevitably mingled with, obtain internal soundness good, the slab of high purity;
The Heating temperature of hot rolling is for the first time 1250-1280 DEG C, and heating rate is 9-12min/cm, adopts the fast speed rolling of the thick continuous casting steel billet low temperature of 300mm, rolling temperature is 1050 DEG C, rolling pass is 4-6 passage, and rolling mode adopts axial rolling on earth, is rolled into the slab that thickness is 220-250mm;
The Heating temperature of hot rolling is for the second time 1250-1280 DEG C, heating rate is 8-11min/cm, adopt two-stage rolling, one-phase rolling starts temperature≤1050 DEG C, passage is depressed more than 20mm/ road, is rolled into the slab that thickness is 200-230mm, and two-stage rolling starts temperature between 920-940 DEG C, two-stage accumulative total passage 5-7 time, being rolled into thickness is 160-190mm finished steel plate.
The value list (wt%) of table 1 various embodiments of the present invention and comparative example
| Embodiment | C | Si | Mn | P | S | Nb | V | Ni | N | Als | CEV |
| 1 | 0.168 | 0.35 | 1.50 | 0.010 | 0.003 | 0.042 | 0.035 | 0.35 | 0.008 | 0.020 | 0.443 |
| 2 | 0.158 | 0.34 | 1.55 | 0.012 | 0.002 | 0.030 | 0.042 | 0.47 | 0.006 | 0.015 | 0.444 |
| 3 | 0.165 | 0.38 | 1.42 | 0.010 | 0.003 | 0.045 | 0.048 | 0.50 | 0.008 | 0.028 | 0.442 |
| 4 | 0.140 | 0.50 | 1.38 | 0.010 | 0.004 | 0.052 | 0.052 | 0.49 | 0.007 | 0.030 | 0.419 |
| 5 | 0.159 | 0.46 | 1.41 | 0.010 | 0.003 | 0.060 | 0.055 | 0.38 | 0.009 | 0.040 | 0.430 |
| 6 | 0.180 | 0.33 | 1.25 | 0.009 | 0.003 | 0.048 | 0.038 | 0.55 | 0.006 | 0.035 | 0.433 |
| Contrast 1 | 0.135 | 0.28 | 1.45 | 0.013 | 0.004 | 0.025 | 0.030 | 0.20 | 0.009 | 0.012 | 0.396 |
| Contrast 2 | 0.195 | 0.26 | 1.36 | 0.016 | 0.008 | 0.062 | 0.056 | 0.32 | 0.010 | 0.042 | 0.454 |
Table 2 various embodiments of the present invention and comparative example inclusion and obnoxious flavour and element parameter list
The main technologic parameters list (one) of table 3 various embodiments of the present invention and comparative example
The main technologic parameters list (two) of table 4 various embodiments of the present invention and comparative example
The mechanical properties test result of table 5 various embodiments of the present invention and comparative example
As can be seen from Table 5, yield strength >=the 360MPa of the thick bridge anchor plate of spy of the present invention, tensile strength >=500MPa, unit elongation >=25%,-20 DEG C of ballistic work >=160J, one-level flaw detection is simultaneously qualified, and the relative reduction in area of Z-direction stretching simultaneously can reach Z25 rank, and-40 DEG C of Charpy-V impact powers (v-notch) are more than 100J.
Claims (4)
1. the thick bridge anchor of the spy of low compression ratio pading plate, the thickness that it is characterized in that described bridge anchor pading plate is 160-190mm, compression ratio is 1.58-1.87, its chemical composition is C:0.14-0.18%, Si:0.33-0.5%, Mn:1.25-1.55%, P by weight percentage :≤0.012%, S :≤0.004%, Nb≤0.03-0.06%, V:0.035-0.055%, Ni:0.35-0.55%, N≤0.008, Als:0.015-0.04%, and all the other are Fe and are inevitably mingled with; Carbon equivalent≤0.45.
2. the production method of the thick bridge anchor of the spy of low compression ratio as claimed in claim 1 pading plate, is characterized in that comprising that converter smelting, LF stove and the refining of RH stove, continuous casting become base, hot rolling for the first time, hot rolling for the second time, the several steps of slow cooling, wherein:
The Heating temperature of hot rolling is for the first time 1250-1280 DEG C, heating rate is 9-12min/cm, adopt the fast speed rolling of the thick continuous casting steel billet low temperature of 300mm, rolling temperature is 1050 DEG C, the total passage of rolling is for the first time 4-6 passage, rolling mode adopts axial rolling on earth, is rolled into the slab that thickness is 220-250mm;
The Heating temperature of hot rolling is for the second time 1250-1280 DEG C, heating rate is 8-11min/cm, adopt two-stage rolling, one-phase rolling starts temperature≤1050 DEG C, rolling pass draught, more than 20mm/ road, is rolled into the slab that thickness is 200-230mm, and two-stage rolling starts temperature between 920-940 DEG C, two-stage accumulative total rolling pass 5-7 time, being rolled into thickness is 160-190mm finished steel plate.
3. the production method of the thick bridge anchor of the spy of low compression ratio as claimed in claim 2 pading plate, is characterized in that controlling the Fruit storage time in the time carrying out the refining of RH stove to be not less than 15 minutes.
4. the production method of the thick bridge anchor of the spy of low compression ratio as claimed in claim 2 pading plate, is characterized in that: continuous casting becomes O, N, H, P, S in the steel billet that base makes to be controlled at below 250ppm, non-metallic inclusion is comprehensive≤and 2.5 grades.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105755375A (en) * | 2016-04-19 | 2016-07-13 | 江阴兴澄特种钢铁有限公司 | Low-compression-ratio high-performance ultra-thick steel plate produced by continuous casting billet and manufacturing method of steel plate |
| CN105925893A (en) * | 2016-06-23 | 2016-09-07 | 江阴兴澄特种钢铁有限公司 | S355NL low-carbon high-toughness low alloy steel plate of 250 mm thickness and manufacturing method thereof |
| CN107557690A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | The super-thick steel plate and its manufacture method of a kind of low temperature resistant and anti-lamellar tearing |
| CN108034898A (en) * | 2017-12-11 | 2018-05-15 | 湖南工业大学 | The 160mm thickness special heavy plate and its production method of low compression ratio condition production |
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| CN101880824A (en) * | 2010-06-14 | 2010-11-10 | 南阳汉冶特钢有限公司 | Q345q-series super-thick bridge steel plate and production method thereof |
| CN201880824U (en) * | 2010-11-04 | 2011-06-29 | 宁波泰立电子科技有限公司 | Bending fixture for port resonator copper wires |
| CN103397251A (en) * | 2013-08-05 | 2013-11-20 | 武汉钢铁(集团)公司 | 150-190 mm thick bridge steel produced by continuous casting slab and technology thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101705423A (en) * | 2009-11-25 | 2010-05-12 | 首钢总公司 | Low-cost steel plate for building structure and manufacturing method thereof |
| CN101880824A (en) * | 2010-06-14 | 2010-11-10 | 南阳汉冶特钢有限公司 | Q345q-series super-thick bridge steel plate and production method thereof |
| CN201880824U (en) * | 2010-11-04 | 2011-06-29 | 宁波泰立电子科技有限公司 | Bending fixture for port resonator copper wires |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105755375A (en) * | 2016-04-19 | 2016-07-13 | 江阴兴澄特种钢铁有限公司 | Low-compression-ratio high-performance ultra-thick steel plate produced by continuous casting billet and manufacturing method of steel plate |
| CN105925893A (en) * | 2016-06-23 | 2016-09-07 | 江阴兴澄特种钢铁有限公司 | S355NL low-carbon high-toughness low alloy steel plate of 250 mm thickness and manufacturing method thereof |
| CN105925893B (en) * | 2016-06-23 | 2017-11-03 | 江阴兴澄特种钢铁有限公司 | S355NL low carbon and high ductilities low alloy steel plate thick a kind of 250mm and its manufacture method |
| CN107557690A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | The super-thick steel plate and its manufacture method of a kind of low temperature resistant and anti-lamellar tearing |
| CN107557690B (en) * | 2016-06-30 | 2019-03-26 | 鞍钢股份有限公司 | The super-thick steel plate and its manufacturing method of a kind of low temperature resistant and anti-lamellar tearing |
| CN108034898A (en) * | 2017-12-11 | 2018-05-15 | 湖南工业大学 | The 160mm thickness special heavy plate and its production method of low compression ratio condition production |
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| CN104164621B (en) | 2016-05-04 |
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