CN102041438A - Low-alloy high-strength structural-steel extra-thick board Q460C and production method thereof - Google Patents
Low-alloy high-strength structural-steel extra-thick board Q460C and production method thereof Download PDFInfo
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Abstract
The invention discloses a low-alloy high-strength structural-steel extra-thick board Q460C and a production method thereof, the extra-thick board comprises the following chemical constituents in percentage by weight (with wt% as a unit): C: not more than 0.20, Si: not more than 0.60, Mn: 1.40-1.60, P: not more than 0.020, S: not more than 0.005, microalloying elements (V+Nb+Ti+Ni): not more than 0.25, Als: not less than 0.015, and the balance of Fe and residual elements. The microalloying elements are selected reasonably, the elements V, Nb, Ti, and Ni are added in best match, and therefore, the double effects of precipitation strengthening and fine-grain strengthening are fully exerted to ensure that each performance index of a pressure vessel board can meet the requirement of national standard on 120mm under the premise of not reducing plasticity and toughness.
Description
Technical field
The present invention relates to the steel production technical field, be specifically related to a kind of low-alloy high-tensile structural steel Q460C special heavy plate and production method thereof.
Background technology
Along with China's economic construction and social development, requirement increases substantially the obdurability of steel, development adapts to the different kinds that require, improve steel product quality, reduce production costs, according to the requirement of Sustainable development, exploitation is with human friendly base mateiral, and this has become is engaged in the ferrous materials main direction of studying.At present, the domestic fertile steel mill of known Q460C special heavy plate is also few, and research and report are seldom arranged both at home and abroad.Particularly the guaranteed cost of thickness more than 100mm, protect that flaw detection low-alloy high-tensile structural steel Q460C steel plate is big with its production difficulty, tooling requires reason such as special to produce, particularly specification is thicker, substance is big, adopts Rolling from Ingot system lumber recovery extremely low.Accelerate restructuring in addition, promote industrial upgrading, realize the enterprise product quality upgrading, have a very important role for strengthening enterprise competitiveness.
Summary of the invention
Therefore, the object of the present invention is to provide the guaranteed cost of a kind of thickness more than 100mm, the low-alloy high-tensile structural steel Q460C special heavy plate and the production method thereof of protecting flaw detection.
A kind of low-alloy high-tensile structural steel Q460C special heavy plate, it comprises following chemical components in mass percent (unit, wt%): C :≤0.20, Si :≤0.60, Mn:1.40～1.60, P :≤0.020, S :≤0.005, micro alloying element (V+Nb+Ti+Ni) :≤0.25, Als: 〉=0.015, other is Fe and relict element.
The function analysis of above-mentioned chemical element is as follows: C: be most basic strengthening element in the steel, improve intensity, but C influences the welding property of steel and influences toughness.Take all factors into consideration, the content of carbon is hanging down of control as far as possible.Si: be the solution strengthening element, favourable to the intensity that improves steel plate.Mn: be the solution strengthening element, all favourable to intensity and the toughness that improves steel plate.P: unfavorable to welding, and have certain cold shortness, and in this steel grade, belong to harmful element, that should control is low as far as possible.S: easily form the MnS type impurity, have certain red brittleness, belong to harmful element in this steel grade, that should control is low as far as possible.Nb, Ti, V: in steel, can combine, form fine carbide or carbonitride, can play crystal grain thinning and dispersion-strengthened action, thereby reach the net effect of the obdurability of effective raising steel with C, N.Ni: an amount of adding can effectively improve the low-temperature impact toughness of steel plate.Al: can play strong desoxydatoin and crystal grain thinning strengthening effect.
The thickness of described guaranteed cost, guarantor's flaw detection Hi-Stren steel Q460C special heavy plate is 120mm.
A kind of production method of low-alloy high-tensile structural steel Q460C special heavy plate, it may further comprise the steps:
A. molten iron KR desulfurization;
B. converter argon station smelts: tapping carbon 〉=0.05%, tapping P≤0.018%, S≤0.012%; Point blows number of times must not be greater than 2 times, slag under the tapping process of keeping under strict control;
C.LF is concise: adopt the big quantity of slag to carry out slag making, guarantee that the white slag hold-time is controlled at more than the 12min;
The d.VD vacuum C a processing that outgases: vacuumize and add the silico-calcium piece in the forward direction molten steel and carry out Ca and handle, the dwell time under≤67Pa is controlled by 〉=18min;
E. die casting cast;
F. steel ingot heating: the holding temperature of dead soaking pit is controlled at 1260 ℃～1280 ℃;
G. de-scaling;
H.3800 mill milling: adopt the controlled rolling of II type, start rolling temperature is controlled between 1050～1150 ℃, rough rolling step adopts " high temperature low speed is depressed greatly " technology, when 960 ℃～1000 ℃ of temperature, stop rolling the steel that dries in the air, the steel thickness that dries in the air is finished product thickness+(60～80) mm, and the two-stage start rolling temperature is below≤860 ℃, reduction in pass is controlled at 15～30mm, and the accumulative total draft is not less than 60%; Finishing temperature is controlled at 800～860 ℃; In addition, when rolling, adopt edger roll to squeeze the limit simultaneously;
The i.ACC cooling: cool off repeatedly with ACC rolling back, must treat when watering repeatedly could water once more after steel plate returns red (30-60S), returns 660～700 ℃ of red temperature, and cooling rate is controlled at 3～10 ℃/S;
J. align;
K. steel plate cooling in heap: steel plate (or adopting the woven asbesto parcel) cooling in heap in insulation can immediately that rolls off the production line, cooling in heap temperature 〉=450 ℃, the cooling in heap time is not less than 48 hours;
L. normalizing thermal treatment: normalizing temperature is chosen in Ar3+ (20～60 ℃) interval, adopts the soaking time of (1.8～2.0) min/mm+30min, and air cooling is adopted in cooling.
The present invention is directed to low-alloy high-tensile structural steel plate property, flaw detection are had relatively high expectations, for special thick low-alloy high-strength structural steel and iron, the composition design is particularly crucial.Expect the special thick Q460C low-alloy high-tensile structural steel plate of 120mm, should rationally select micro alloying element for use, utilize the compound adding of best proportioning of V, Nb, Ti, Ni, give full play to precipitation strength and refined crystalline strengthening double effects, under the prerequisite that does not reduce plasticity and toughness, guarantee to make every performance index of pressurized vessel plate to reach the requirement of GB 120mm.For guaranteeing steel plate mechanical property and flaw detection requirement, take the Clean Steel smelting technology simultaneously, P, S, N, H, O five big harmful element content in the steel of keeping under strict control.According to the steel plate that the inventive method is produced, yield strength is controlled at 410～515Mpa, on average reaches 464MPa, than standard 84MPa more than needed; Tensile strength is controlled at 575～630MPa, on average reaches 583MPa, and than standard 53MPa more than needed, elongation is controlled at 18%～25%, and mean value is 21%, than standard more than needed 5%; 0 ℃ of V-type is impacted and is controlled at 143～206J, has on average reached 176J, and performance index satisfy the Q460C development requires fully.In addition, for the final effect of verifying that this scheme reaches, sample added done-20 ℃ of V-type ballistic works, the result is controlled at 116～183J.Show that thus the 120mm thickness Q460C low-alloy high-strength steel plate of this exploitation has reached the performance class of Q460D.Outer inspection and flaw detection: the steel plate of being developed is examined outward, and the percentage of A-class goods 100% is detected a flaw by JB/T4730.3, and unification level rate is 75%, and closing three grades of rates is 100%, has reached desired result.
Embodiment
Embodiment 1
, VD vacuum outgas (Ca processing) concise, die casting cast, steel ingot heating, de-scaling, 3800 mill millings, ACC cooling, aligning, steel plate cooling in heap, normalizing heat treatment technique by molten iron KR desulfurization, converter smelting (argon station), LF, acquisition is described in table 1 below the Q460C Finished Steel of chemical ingredients, and its processing parameter and mechanical property are seen as following table 3,4.
The chemical ingredients of table 1: embodiment 1 steel
| C％ | Si％ | Mn％ | P％ | S％ | Als％ | (Nb+Ti+V+Ni)％ |
| 0.166 | 0.32 | 1.53 | 0.010 | 0.002 | 0.034 | 0.221 |
Embodiment 2
, VD vacuum outgas (Ca processing) concise, die casting cast, steel ingot heating, de-scaling, 3800 mill millings, ACC cooling, aligning, steel plate cooling in heap, normalizing heat treatment technique by molten iron KR desulfurization, converter smelting (argon station), LF, acquisition is described in table 2 below the Q460C Finished Steel of chemical ingredients, and its processing parameter and mechanical property are seen as following table 3,4.
The chemical ingredients of table 2: embodiment 2 steel
| C％ | Si％ | Mn％ | P％ | S％ | Als％ | (Nb+Ti+V+Ni)％ |
| 0.162 | 0.34 | 1.56 | 0.012 | 0.003 | 0.029 | 0.217 |
Operational path of the present invention: molten iron KR desulfurization → converter smelting (argon station) → LF is concise → and VD vacuum outgas (Ca processing) → die casting cast → ingot slow cool → heating → de-scaling → 3800 mill millings → ACC cools off → aligns → slow cooling → surface inspection that rolls off the production line → thermal treatment → finishing → flaw detection → check → judgement → salable product warehouse-in.
The composition design: low-alloy high-tensile structural steel is had relatively high expectations to plate property, flaw detection, and for special thick low-alloy high-strength structural steel and iron, the composition design is particularly crucial.Expect the special thick Q460C low-alloy high-tensile structural steel plate of 120mm, should rationally select micro alloying element for use, utilize the compound adding of best proportioning of V, Nb, Ti, Ni, give full play to precipitation strength and refined crystalline strengthening double effects, under the prerequisite that does not reduce plasticity and toughness, guarantee to make every performance index of pressurized vessel plate to reach the requirement of GB 120mm.For guaranteeing steel plate mechanical property and flaw detection requirement, take the Clean Steel smelting technology simultaneously, P, S, N, H, O five big harmful element content in the steel of keeping under strict control.
Molten steel cleanliness factor: for obtaining good internal soundness, guarantee the requirement of detecting a flaw, the smelting of Clean Steel is the basis, mainly guarantee from two aspects, the one, total rank of non-metallic inclusion in the molten steel (A, B, C, D four big classes) is controlled in 3.0, and the 2nd, the content of five big harmful elements in the molten steel of keeping under strict control, concrete measure is: desulfurization taked for two steps walked, adopt molten iron pre-desulfurization technology to guarantee content on the one hand, make white slag in the reinforcement of LF refining furnace on the other hand and carry out the secondary desulfurization into stove molten iron S.Deoxidation is same adopted for two steps walked, and the deoxidation operation is strengthened in the converter terminal C% content (preventing peroxidation) of keeping under strict control on the one hand, reinforcement pushing off the slag tapping, improves the molten steel purity; Make full use of the LF refining furnace on the other hand, adopt high temperature, high basicity, the abundant deoxidation of big quantity of slag ground ferric oxide slagging process; Moreover need prolongation dwell time under the VD vacuum condition fully outgases.In strict accordance with the Clean Steel production process route, guarantee that S, P, N, H, O five big harmful elements are controlled in the 160PPm.
Ingot shape is selected: because the Rolling from Ingot system of employing lumber recovery is lower, be that guaranteed performance is up to standard simultaneously, in conjunction with practical experience in the past, this compression ratio at least 〉=6, in conjunction with the steel ingot characteristics, preferred 33t steel ingot, this steel ingot mean thickness 890mm, average compression ratio 7.4 reaches design requirements fully.Pouring technology:, adhere to " high temperature waters slowly, and low temperature is annotated soon " principle in strict accordance with the Q460C slab steel ingot pouring technology control of setting.Concrete pouring technology requires to see Table 3.
Table 3: die casting pouring technology
Annotate: T11 represent liquidus temperature, and motor-car, raising one's hat and taking off the ingot time begins calculating from having annotated.
Billet is managed: go into more than the special-purpose burial pit slow cooling of the die casting 24h after taking off ingot by normal process, roll sending behind the surperficial dress watch.The steel rolling heating process: the steel ingot heating is carried out in the technology that increases soaking time 1h by 33t low-alloy series heating curve, grills thoroughly, burns evenly to guarantee steel; The holding temperature of dead soaking pit is by 1260 ℃～1280 ℃ execution;
Controlled rolling technology: adopt the controlled rolling of II type, start rolling temperature is controlled between 1050～1150 ℃, rough rolling step adopts " high temperature low speed is depressed greatly " technology, under the prerequisite that equipment allows, increase draught, increase the distortion penetration degree, the internal structural flaw that as far as possible heals, total draft is not less than 50%; When 960 ℃～1000 ℃ of temperature, stop rolling the steel that dries in the air, the steel thickness that dries in the air is finished product thickness+(60～80) mm, notes swing when drying in the air steel, prevents black seal; Treat rolled piece below roller-way is treated temperature or water-cooled to 860 ℃, the beginning subordinate phase is rolling, and draught is controlled at 15～30mm, and the accumulative total draft is not less than 60%, 800～860 ℃ of finishing temperatures.
Cooling control technology: in described ACC cooling, cool off repeatedly with ACC rolling back, must treat when watering repeatedly could water once more after steel plate returns red (30-60S), returns 660～700 ℃ of red temperature, and cooling rate is controlled at 3～10 ℃/S.Retarded cooling process: steel plate (or adopting the woven asbesto parcel) cooling in heap in insulation can that rolls off the production line immediately, cooling in heap temperature 〉=450 ℃, the cooling in heap time is not less than 48 hours.Thermal treatment: normalizing temperature is chosen in Ar3+ (20～60 ℃) interval, adopts the soaking time of (1.8～2.0) min/mm+30min, and air cooling is adopted in cooling.Flaw detection is carried out the JB/T4730.3 non-destructive testing standard and is carried out; Surface quality requirement, composition and mechanical mechanics property are pressed GB1591-2008 and are carried out, and specifically see Table 4.
The requirement of table 4:Q460C steel plate mechanical mechanics property
Claims (3)
1. low-alloy high-tensile structural steel Q460C special heavy plate, it is characterized in that: it comprises following chemical components in mass percent (unit, wt%): C :≤0.20, Si :≤0.60, Mn:1.40～1.60, P :≤0.020, S :≤0.005, micro alloying element (V+Nb+Ti+Ni) :≤0.25, Als: 〉=0.015, other is Fe and relict element.
2. low-alloy high-tensile structural steel Q460C special heavy plate as claimed in claim 1 is characterized in that: the thickness of Hi-Stren steel Q460C special heavy plate is 120mm.
3. the production method of low-alloy high-tensile structural steel Q460C special heavy plate as claimed in claim 1, it is characterized in that: it may further comprise the steps:
A. molten iron KR desulfurization;
B. converter argon station smelts: tapping carbon 〉=0.05%, tapping P≤0.018%, S≤0.012%; Point blows number of times must not be greater than 2 times, slag under the tapping process of keeping under strict control;
C.LF is concise: adopt the big quantity of slag to carry out slag making, guarantee that the white slag hold-time is controlled at more than the 12min;
The d.VD vacuum C a processing that outgases: vacuumize and add the silico-calcium piece in the forward direction molten steel and carry out Ca and handle, the dwell time under≤67Pa is controlled by 〉=18min;
E. die casting cast;
F. steel ingot heating: the holding temperature of dead soaking pit is controlled at 1260 ℃～1280 ℃;
G. de-scaling;
H.3800 mill milling: adopt the controlled rolling of II type, start rolling temperature is controlled between 1050～1150 ℃, rough rolling step adopts " high temperature low speed is depressed greatly " technology, when 960 ℃～1000 ℃ of temperature, stop rolling the steel that dries in the air, the steel thickness that dries in the air is finished product thickness+(60～80) mm, and the two-stage start rolling temperature is below≤860 ℃, reduction in pass is controlled at 15～30mm, and the accumulative total draft is not less than 60%; Finishing temperature is controlled at 800～860 ℃; In addition, when rolling, adopt edger roll to squeeze the limit simultaneously;
The i.ACC cooling: cool off repeatedly with ACC rolling back, must treat when watering repeatedly could water once more after steel plate returns red (30-60S), returns 660～700 ℃ of red temperature, and cooling rate is controlled at 3～10 ℃/S;
I. align;
K. steel plate cooling in heap: steel plate (or adopting the woven asbesto parcel) cooling in heap in insulation can immediately that rolls off the production line, cooling in heap temperature 〉=450 ℃, the cooling in heap time is not less than 48 hours;
1. normalizing thermal treatment: normalizing temperature is chosen in Ar3+ (20～60 ℃) interval, adopts the soaking time of (1.8～2.0) min/mm+30min, and air cooling is adopted in cooling.
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| CN102367539A (en) * | 2011-06-28 | 2012-03-07 | 南阳汉冶特钢有限公司 | Low-alloy Q390C thick plate and its production method |
| CN102941226A (en) * | 2012-10-12 | 2013-02-27 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Controlled rolling and cooling process for extra-thick plate with guaranteed cost |
| CN103160739A (en) * | 2013-03-16 | 2013-06-19 | 南阳汉冶特钢有限公司 | Continuously cast 80mm-thick bridge steel Q420qE and preparation process thereof |
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