CN104313468A - Steel plate for 460MPa grade low-alloy high-strength structure and production method of steel plate - Google Patents
Steel plate for 460MPa grade low-alloy high-strength structure and production method of steel plate Download PDFInfo
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- CN104313468A CN104313468A CN201410647390.1A CN201410647390A CN104313468A CN 104313468 A CN104313468 A CN 104313468A CN 201410647390 A CN201410647390 A CN 201410647390A CN 104313468 A CN104313468 A CN 104313468A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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Abstract
The invention provides a steel plate for a 460MPa grade low-alloy high-strength structure. The steel plate is prepared from the following chemical components in percentage by mass: 0.03-0.09% of C, 0.10-0.40% of Si, 1.00-1.60% of Mn, 0.01-0.03% of Nb, 0.005-0.030% of Ti, 0.015-0.045% of Als, 0.0005-0.0030% of B, less than or equal to 0.015% of P, less than or equal to 0.007% of S, and the balance of Fe and inevitable impurities, wherein the carbon equivalent is less than or equal to 0.35%. A production method of the steel plate sequentially comprises the following steps: smelting, refining, continuous-casting, heating a steel blank, performing controlled rolling, performing controlled rolling, and cooling slowly, thereby obtaining a finished product. The steel plate for the 460MPa grade low-alloy high-strength structure is good in property and low in cost, the carbon equivalent is not greater than 0.35%, and the production process is simple and easy to operate.
Description
Technical field
The invention belongs to low-alloy high-strength structural steel production technique field, specifically refer to 460MPa level low alloy high-strength structural steel and production method thereof.
Background technology
Along with developing rapidly of the fields such as the energy, chemical industry, water power, building, the low-alloy high-tensile structural steel market requirement increases day by day, and reduce to meet engineering structure deadweight in above-mentioned industry, stowage capacity improve development trend, yield strength at 460MPa and possess better welding property steel plate (trade mark Q460) consumption get more and more.What the steel plate of this intensity rank had produces in the mode of quenching+tempering after rolling (modified), what have produces in the mode of normalizing after rolling, above two kinds of modes of production not only carbon content at about 0.16% (wt%, identical below), carbon equivalent is scarcely lower than 0.42%, also added the noble alloy elements such as Mo, Cr, Cu, Ni, V, and the production cycle is long, energy consumption is high; Although the mode of thermo-mechanical rolling (TMCP) that adopts had is produced, shorten Production Flow Chart, but its carbon equivalent is mostly about 0.40%, and carbon content >=0.12%, and the mode of TMCP is adopted to produce and the Q460 steel plate of carbon content≤0.10% is because of adding of noble alloy element such as Mo, Cr, Cu, Ni, V that cost is higher.
Summary of the invention
The object of the invention is to provide a kind of 460MPa level low alloy high-strength structural steel and production method thereof according to the deficiencies in the prior art, 460MPa level low alloy high-strength structural steel performance of the present invention is good, carbon equivalent is not more than 0.35, and cost is low, and production process simply easily operates.
Technical scheme of the present invention is as follows: a kind of 460MPa level low alloy high-strength structural steel, its chemical composition is by mass percentage: C:0.03 ~ 0.09%, Si:0.10 ~ 0.40%, Mn:1.00 ~ 1.60%, Nb:0.01 ~ 0.03%, Ti:0.005 ~ 0.030%, Als:0.015 ~ 0.045%, B:0.0005 ~ 0.0030%, P≤0.015%, S≤0.007%, all the other are Fe and inevitable impurity; Carbon equivalent ce V=C+Mn/6+ (the Cr+Mo+V)/5+ (Ni+Cu)/15 of this steel simultaneously, and CEV≤0.35%.
A production method for above-mentioned 460MPa level low alloy high-strength structural steel, it comprises the following steps successively: smelting, refining, continuous casting, heating steel billet, controlled rolling, controlled cooling model, slow cooling, finished product, is characterized in that:
During described heating steel billet, Heating temperature is 1150 ~ 1250 DEG C;
During described controlled rolling, adopt two benches controlled rolling, make the abundant refinement of the tissue before phase transformation, first stage start rolling temperature is 1030-1150 DEG C, and finishing temperature is 960-1030 DEG C; Subordinate phase start rolling temperature is 900-1000 DEG C, and finishing temperature is 780-860 DEG C;
During the described controlled cooling model stage, carry out controlled cooling model by laminar flow or Water-Curta in Cooling mode, open cold temperature 730-830 DEG C, red temperature 500-650 DEG C.
Preferably, during described smelting process, first carry out hot metal pretreatment, then adopt converter smelting, by top blast or top bottom blowing.
Preferably, during described refining process, carry out microalloying, controlling each chemical composition in steel is by mass percentage: C:0.03 ~ 0.09%, Si:0.10 ~ 0.40%, Mn:1.00 ~ 1.60%, Nb:0.01 ~ 0.03%, Ti:0.005 ~ 0.030%, Als:0.015 ~ 0.045%, B:0.0005 ~ 0.0030%, P≤0.015%, S≤0.007%, all the other are Fe and inevitable impurity; Carbon equivalent ce V=C+Mn/6+ (the Cr+Mo+V)/5+ (Ni+Cu)/15 of this steel simultaneously, and CEV≤0.35%.
Preferably, during described casting process, adopt induction stirring, reduce element segregation.
C content of the present invention is selected 0.03 ~ 0.09%.Because C be improve armor plate strength the most effectively and one of the most cheap element, be ensure the intensity of steel plate, the lower limit of C content is 0.03%.But will produce adverse influence to the welding property of steel plate and low-temperature impact toughness when C content is too high, thus the upper limit of C content is 0.09%.
Si content of the present invention mainly improves the intensity of steel with solution strengthening form at 0.10 ~ 0.40%, Si, be also the bioelement of deoxidation simultaneously.In steel of the present invention, the too high low-temperature impact toughness that can reduce steel of Si content.
Mn content of the present invention is 1.00 ~ 1.60%, Mn is important highly malleablized element and good reductor, sweetening agent, too low Mn then can not ensure the intensity of steel but too high Mn has disadvantageous effect to steel billet center segregation, impair the toughness of steel plate, and easily crack when welding, for the performance obtaining steel of the present invention, be also unnecessary.
Nb content of the present invention is 0.010 ~ 0.030%, Nb is strong carboritride forming element, can improve the austenite recrystallization temperature of steel.Austenite can be rolled under higher rolling temperature.In addition the precipitation strength effect of Nb in controlled rolling continuous cooling process, can pinning austenite crystal by the strain induced precipitate of the carbonitride of Nb, and fining austenite grains also improves intensity and low-temperature flexibility.But too high Nb also easily forms Low melting point eutectic with the element such as Fe, C, thus the tendency of increase weld metal generation thermal crack.
Ti content of the present invention is 0.005 ~ 0.030%, Ti is strong nitride forming element, and the nitride of Ti can pinning austenite grain boundary effectively, therefore contributes to controlling growing up of austenite crystal.
It is the main deoxidant element in steel that Als content of the present invention controls at 0.015 ~ 0.045%, Al.To the oxide inclusion of Al be caused to increase during Al too high levels, reduce the purity of steel, be unfavorable for the toughness of steel.
B content of the present invention controls 0.0005 ~ 0.0030%, and adding of micro-B interacts with the element such as Mn, Nb, can promote middle temperature transformation, improve the intensity of steel plate.
P and S is inevitable harmful element in steel, to the plasticity of steel and toughness unfavorable, P and S content should be reduced as far as possible, improve the cleanliness factor of steel.But consider that reducing P, S content increases the difficulty of smelting and cost, in steel of the present invention, P controls≤0.015%, S and controls≤0.007%.
460MPa level low alloy high-strength structural steel composition of the present invention, with the micro-B design of the low Nb of low C, finally obtains the mixed structure of ferrite, perlite and bainite.Yield strength >=the 460MPa of steel, tensile strength >=550MPa, unit elongation >=17%; Impact of collision merit: 0 DEG C of KV2 >=200J ,-20 DEG C of KV2 >=150J ,-40 DEG C of KV2 >=100J.Meanwhile, chemical composition is simple, and carbon equivalent≤0.35, does not use the noble alloy elements such as Mo, Cr, Cu, Ni, V, saves cost.In addition, the present invention adopts the mode of controlled rolling and controlled cooling to produce, and do not need temper after rolling, technical process is short, and steel plate thickness can reach 50mm, easily implements to control, and has very strong practicality.
Embodiment
Below by way of specific embodiment, 460MPa level low alloy high-strength structural steel of the present invention and production method thereof are further described:
Table 1 lists the weight percentage (surplus is Fe and inevitable impurity) of the chemical composition of the 460MPa level low alloy high-strength structural steel of embodiment 1-6
Table 1 embodiment 1-6 chemical composition (w%)
Steel in above-described embodiment 1-6 is produced according to following steps: smelting, refining, continuous casting, heating steel billet, controlled rolling, controlled cooling model, slow cooling, finished product.
During wherein said heating steel billet, Heating temperature is 1150 ~ 1250 DEG C;
During described controlled rolling, adopt two benches controlled rolling, make the abundant refinement of the tissue before phase transformation, first stage start rolling temperature is 1030-1150 DEG C, and finishing temperature is 960-1030 DEG C; Subordinate phase start rolling temperature is 900-1000 DEG C, and finishing temperature is 780-860 DEG C;
During the described controlled cooling model stage, carry out controlled cooling model by laminar flow or Water-Curta in Cooling mode, open cold temperature 730-830 DEG C, red temperature 500-650 DEG C.
During described smelting process, first carry out hot metal pretreatment, then adopt converter smelting, by top blast or top bottom blowing.
During described refining process, carry out microalloying, in control steel, each chemical composition is for shown in table 1.
During described casting process, adopt induction stirring, reduce element segregation.
Wherein, the some processes parameter corresponding to embodiment 1-6 is as shown in table 2.
Table 2 embodiment 1-6 some processes parameter
460MPa level low alloy high-strength structural steel 1-6 embodiment 1 ~ 6 made detects, and obtains 460MPa level low alloy high-strength structural steel product performance data, as shown in table 3.
Table 3 low-alloy high-strength structural steel mechanics properties testing result
As can be seen from Table 3,460MPa level low alloy high-strength structural steel excellent mechanical of the present invention.
The scientific research personnel in the technology of the present invention field can do the change of content and form unsubstantiality according to above-mentioned and do not depart from institute of the present invention essential scope, and therefore, the present invention is not limited to above-mentioned concrete embodiment.
Claims (5)
1. a 460MPa level low alloy high-strength structural steel, its chemical composition is by mass percentage: C:0.03 ~ 0.09%, Si:0.10 ~ 0.40%, Mn:1.00 ~ 1.60%, Nb:0.01 ~ 0.03%, Ti:0.005 ~ 0.030%, Als:0.015 ~ 0.045%, B:0.0005 ~ 0.0030%, P≤0.015%, S≤0.007%, all the other are Fe and inevitable impurity; Carbon equivalent ce V=C+Mn/6+ (the Cr+Mo+V)/5+ (Ni+Cu)/15 of this steel simultaneously, and CEV≤0.35%.
2. a production method for 460MPa level low alloy high-strength structural steel according to claim 1, it comprises the following steps successively: smelting, refining, continuous casting, heating steel billet, controlled rolling, controlled cooling model, slow cooling, finished product, is characterized in that:
During described heating steel billet, Heating temperature is 1150 ~ 1250 DEG C;
During described controlled rolling, adopt two benches controlled rolling, make the abundant refinement of the tissue before phase transformation, first stage start rolling temperature is 1030-1150 DEG C, and finishing temperature is 960-1030 DEG C; Subordinate phase start rolling temperature is 900-1000 DEG C, and finishing temperature is 780-860 DEG C;
During the described controlled cooling model stage, carry out controlled cooling model by laminar flow or Water-Curta in Cooling mode, open cold temperature 730-830 DEG C, red temperature 500-650 DEG C.
3. the production method of 460MPa level low alloy high-strength structural steel according to claim 2, is characterized in that:
During described smelting process, first carry out hot metal pretreatment, then adopt converter smelting, by top blast or top bottom blowing.
4. the production method of 460MPa level low alloy high-strength structural steel according to claim 2, is characterized in that:
During described refining process, carry out microalloying, controlling each chemical composition in steel is by mass percentage: C:0.03 ~ 0.09%, Si:0.10 ~ 0.40%, Mn:1.00 ~ 1.60%, Nb:0.01 ~ 0.03%, Ti:0.005 ~ 0.030%, Als:0.015 ~ 0.045%, B:0.0005 ~ 0.0030%, P≤0.015%, S≤0.007%, all the other are Fe and inevitable impurity; Carbon equivalent [CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15]≤0.35% simultaneously.
5. the production method of 460MPa level low alloy high-strength structural steel according to claim 2, is characterized in that:
During described casting process, adopt induction stirring, reduce element segregation.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106636937A (en) * | 2016-10-08 | 2017-05-10 | 武汉钢铁股份有限公司 | Easy-to-weld structural steel with tensile strength in 600 MPa level and production method thereof |
| CN106834919A (en) * | 2016-12-22 | 2017-06-13 | 南京钢铁股份有限公司 | A kind of 460MPa grade high ductilities low-alloy high-strength structural steel plate and its production method |
| CN109913629A (en) * | 2019-01-02 | 2019-06-21 | 武汉钢铁有限公司 | A kind of yield strength 630MPa grades of easy welding structure steels and preparation method thereof |
| CN112981240A (en) * | 2021-01-29 | 2021-06-18 | 邯郸钢铁集团有限责任公司 | Q550MD low-alloy high-strength steel plate and production method thereof |
| CN114686765A (en) * | 2022-03-31 | 2022-07-01 | 鞍钢股份有限公司 | 420 MPa-grade high-toughness extra-thick plate and manufacturing method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106636937A (en) * | 2016-10-08 | 2017-05-10 | 武汉钢铁股份有限公司 | Easy-to-weld structural steel with tensile strength in 600 MPa level and production method thereof |
| CN106834919A (en) * | 2016-12-22 | 2017-06-13 | 南京钢铁股份有限公司 | A kind of 460MPa grade high ductilities low-alloy high-strength structural steel plate and its production method |
| CN106834919B (en) * | 2016-12-22 | 2019-06-28 | 南京钢铁股份有限公司 | A kind of 460MPa grade high ductility low-alloy high-strength structural steel plate and its production method |
| CN109913629A (en) * | 2019-01-02 | 2019-06-21 | 武汉钢铁有限公司 | A kind of yield strength 630MPa grades of easy welding structure steels and preparation method thereof |
| CN112981240A (en) * | 2021-01-29 | 2021-06-18 | 邯郸钢铁集团有限责任公司 | Q550MD low-alloy high-strength steel plate and production method thereof |
| CN112981240B (en) * | 2021-01-29 | 2022-11-04 | 邯郸钢铁集团有限责任公司 | Q550MD low-alloy high-strength steel plate and production method thereof |
| CN114686765A (en) * | 2022-03-31 | 2022-07-01 | 鞍钢股份有限公司 | 420 MPa-grade high-toughness extra-thick plate and manufacturing method thereof |
| CN114686765B (en) * | 2022-03-31 | 2023-03-03 | 鞍钢股份有限公司 | 420 MPa-grade high-toughness extra-thick plate and manufacturing method thereof |
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Application publication date: 20150128 |