CN102021475B - Preparation method of hot-rolled H-shaped steel for low temperature-resisting structure - Google Patents
Preparation method of hot-rolled H-shaped steel for low temperature-resisting structure Download PDFInfo
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Abstract
The invention relates to low temperature-resisting H-shaped steel and a preparation method thereof, wherein the steel comprises the following chemical components in percentage by weight: 0.12-0.22 percent of C, 0.10-0.40 percent of Si, 1.1-1.50 percent of Mn, not more than 0.025 percent of P, not more than 0.025 percent of S, 0.02-0.05 percent of Nb and the balance of iron and trace impurities. The preparation method of the low temperature-resisting H-shaped steel comprises the following steps of: desulfurizing, smelting by using a 120-ton top and bottom combined blown converter, refining by using an LF (Ladle Furnace), continuously casting shaped blanks and rolling large H-shaped steel, wherein after the refinement outside the furnace, the oxygen content in molten steel is not more than 10ppm, and in the continuously-casting process, the superheat degree is controlled to be 20-30 DEG C, the specifications of casting blanks are 555*440*90, 750*370*90 and 1024*390*90, the soaking temperature of a heating furnace is 1200-1300DEG C, the initial rolling temperature at the outer side of a flange is 1100-1180 DEG C, the temperature at the center of a web plate is 1100-1170 DEG C, the final rolling temperature at the outer side of the flange is 850-960 DEG C, the temperature at the center of the web plate is 800-880 DEG C, and the H-shaped steel with the specification of H250-H900 is rolled.
Description
Technical field
The present invention relates to metallurgical technology, belong to low temperature resistant low-alloy high-tensile structural steel, be specifically related to a kind of extremely frigid zones drilling unit structure with hot rolled H-shaped and preparation method thereof.
Background technology
Low temperature resistant structure is mainly used the steel construction piece of building, boats and ships, bridge, power station equipment, water conservancy, the energy, chemical industry, handling machinery and other high loads of extremely frigid zones with H shaped steel.The non-metallic material that these steel are mingled with is few, has the characteristics of impact resistance under cold condition.
Chinese invention patent file CN101255527A (application number 200810014488.8) disclose a kind of have a favorable low-temperature impact toughness add boron H shaped steel and preparation method thereof, this invention composition of steel weight percent is: C0.08～0.20%, Mn1.00～1.60%, Si0.10～0.55%, P≤0.025%, S≤0.025%, Nb0.015～0.035%, B0.0005～0.0012%, surplus are iron and trace impurity.In the smelting process, control steel grade gas content [N]≤0.004%, [O]≤0.0060%, this invention mainly be by add trace B to the advantageous effect of steel toughness as suppressing phosphorus, sulphur segregation and along brilliant fracture improves the form of inclusion and distribution etc.But owing to added B, increased the cost of product, needed simultaneously the nitrogen, the oxygen level that keep lower, process adopts aluminium deoxidation, guaranteeing good deoxidation effect, but the special-shaped billet continuous casting machine of protection cast half-and-half, aluminium deoxidation is infeasible.And the present invention reaches good low temperature resistant effect equally in the situation that does not add B.
Chinese invention patent CN1421286A (application number 02138375.8) discloses a kind of rolling method that contains niobium steel H shaped steel, but the product that this invention relates to is anti--20 ℃ of low-temperature impact works, and product of the present invention is anti--40 ℃ of low-temperature impact works.
Summary of the invention
The present invention with the problem of H shaped steel in composition and the smelting operation of rolling, provides a kind of hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof mainly for low temperature resistant structure, and low temperature resistant steel mechanical property of the present invention is good ,-40 ℃ of average 88J of impact of collision merit.
Designing chemical composition is mainly passed through in this invention; microalloying is mainly used niobium; do not add other element; in addition, be subjected to the restriction of site technique condition, because of the complicacy of special-shaped billet continuous casting machine; can not adopt the full guard cast; so can not adopt the AL deoxidation, to control from other aspect the steel grade oxygen level, like this other technique is had higher requirement.
The weight percentage of chemical ingredients of the present invention is:
C 0.12～0.22%, and Si 0.10～0.40%, and Mn 1.1～1.50%, P≤0.025%, and S≤0.025%, Nb 0.02～0.05%; All the other are iron and trace impurity.
Composition further is optimized for C 0.13～0.17%, and Si 0.15～0.30%, Mn1.2～1.4%, P≤0.015%, S≤0.015%, Nb0.02～0.03%; All the other are iron and trace impurity.
The low temperature resistant structure of the present invention comprises desulfurization, 120 tons of top and bottom combined blown converter smeltings with the preparation method of H shaped steel, and LF refining, casting for shaped blank continuous, large H-shaped steel are rolling, it is characterized in that,
The composition of steel is by weight percentage: C 0.12～0.22%, and Si 0.10～0.40%, and Mn 1.1～1.50%, P≤0.025%, and S≤0.025%, Nb 0.02～0.05%; All the other are iron and trace impurity; Or C 0.13～0.17%, Si 0.15～0.25%, and Mn 1.2～1.4%, P≤0.015%, S≤0.015%, Nb0.02～0.03%; All the other are iron and trace impurity.
After external refining, oxygen level in the molten steel is≤10ppm, in the casting process, superheating temperature is controlled at 20～30 ℃, 1200～1300 ℃ of the soaking temperatures of process furnace, start rolling temperature is for being that 1100～1180 ℃, web central authorities are 1100～1170 ℃ in the edge of a wing outside, and the outside, the finishing temperature edge of a wing is that 850～960 ℃, web central authorities are 800～880 ℃.
The above-mentioned low temperature resistant structure preparation method of H shaped steel, preferred processing condition are as follows:
1) adopt wash heat refining and slag modification technology in the converter tapping process:
Ratio in 4～8kg/t steel before the tapping adds synthetic slag in ladle, the ratio in 0.5～2kg/t steel adds modification agent on the slag surface after the tapping;
2) carry out refining at the LF ladle:
First abundant stirringization slag in the refining process, then get sample one time, total analysis, make yellowish-white slag, result according to a sample analysis adds alloy from feed bin, carries out trimming, ratio in 1.0～2.0m/t before the tapping adds silicon-calcium wire (φ 13), keeps the little argon gas amount of top of the slag fine motion to stir more than the 10min after the refining;
3) continuous casting:
In the casting process, the baking of tundish temperature is 900-920 ℃, crystallizer is to arc, mouth of a river centering, and water quench is partly protected cast, adopt the crystallizer mould flux, the viscosity of covering slag is 0.30～0.35Pas, and fusing point is 1120～1125 ℃, and molten speed is 40-45, basicity is 1.1～1.3, and the consumption of covering slag is 0.70～0.85kg/t steel; Pouring basket liquid level 700mm, liquid level fluctuation of crystallizer≤3mm, pulling rate is controlled at 0.75～1.1m/min;
4) rolling:
1200～1300 ℃ of the soaking temperatures of process furnace, start rolling temperature is for being that 1100～1180 ℃, web central authorities are 1100～1170 ℃ in the edge of a wing outside, the finishing temperature edge of a wing outside is that 850～960 ℃, web central authorities are 800～880 ℃, stocking cools off after going out the TM machine fast, and fast cold final temperature general control is at 500～600 ℃.
Preferably, step 1) composition of described synthetic slag is CaO:40～60% by weight percentage, SiO
2: 5～15%, Al
2O
3: 15～35%, MgO:5～10%.
Preferably, step 1) composition of described modification agent is CaO:30～50% by weight percentage, SiO
2: 5～10%, Al
2O
3: 20～35%, MgO:6～15%, Al:5～20%.
Preferably, step 2) describedly make the color that yellowish-white slag refers to refining slag and be white or yellow, refining furnace is that good reducing atmosphere is arranged to the favourable condition of molten steel desulfurizing, makes high basicity slag, and the color of such refining slag be yellow or white.
Preferably, step 2) the little argon gas amount of described fine motion refers to that argon flow amount is 50～150NL/min.Preferably, keep the little argon gas amount of top of the slag fine motion to stir 10～30min after the refining.Preferred, keep the little argon gas amount of top of the slag fine motion to stir 12～25min after the refining.
Preferably, step 3) composition of described crystallizer mould flux is CaO:27.0～28% by weight percentage, SiO
2: 21.0～22.0%, Al
2O
3: 11～12%, MgO:2～3%, Na
2O:6～7%, K
2O:0.5～0.6%, Fe
2O
3: 1.0～1.5%, F:4～5%, C are fixed/full carbon: 7～8%.
It should be noted that because to contain niobium steel crack sensitivity strong, especially performance is fairly obvious in large-sized special-shaped base, for guaranteeing into stove Hot Metal in Beam Blank surface quality, will all roll off the production line by checking defective timely cleaning, reconditioning to Hot Metal in Beam Blank behind the continuous casting.
The rolling deformation system adopts heavy reduction cogging, heavy reduction rate finish to gauge.For guaranteeing enough pass deformations, to reach crystal grain thinning, to improve the purpose of steel performance, want the heavy reduction cogging at rough rolling step, draught is 30～40% of total reduction, the few passage of heavy reduction is come rolling, so that enough recrystallize motivating forces to be provided to austenite recrystallization, for next step controlled rolling creates conditions.Heavy reduction rate finish to gauge refers in last 2 passages of finish to gauge, requires quick continuous rolling, to realize that last 2 roads accumulation draft as 30%～40%, is controlled at 60%～70% with the last pass deflection.
The NM operation of the present invention all can adopt prior art.
With present low temperature resistant H shaped steel comparision of production, the characteristics of technical solution of the present invention are:
1. the strand of producing is large-sized special-shaped base, adopts half protection cast in the situation of processing condition restriction, produces low temperature resistant High Strength Structural Steel.
2. saving cost, reduce Composition Design and the production of finishing the H shaped steel of low temperature resistant (40 ℃) ballistic work under the micro-condition.
3. resistance to low temperature of the present invention is good ,-40 ℃ of ballistic work average out to 88J.
Embodiment
The present invention will be further described below in conjunction with specific embodiment, but be not limited to this.
Embodiment 1:Q345E
Operational path is:
Molten iron pre-desulfurization → converter smelting → LF refining → casting for shaped blank continuous → large H-shaped steel is rolling → the check warehouse-in.
The measure of preparation method's main technique:
(1) molten iron carries out the desulfurization of pure magnesium grain to the desulfurization station, guarantees after the desulfurization that the sulphur content in the molten iron is≤0.020%.
(2) converter smelting after converter smelting is complete, adds synthetic slag and presses the 5kg/t steel in ladle before the tapping, the ferro-niobium of adding 0.42kg/t in the tapping process adds modification agent on the slag surface after the tapping and presses the 1kg/t adding.The composition of described synthetic slag is CaO:48% by weight percentage, SiO
2: 12%, Al
2O
3: 35%, MgO:10%.The composition of described modification agent is CaO:30% by weight percentage, SiO
2: 10%, Al
2O
3: 30%, MgO:15%, Al:15%.Those skilled in the art's scientific research selects suitable compound or composition as synthetic slag and properties-correcting agent according to actual needs, as long as component content meets the requirements.
(3) carry out refining at the LF ladle, then first abundant stirringization slag gets sample one time in the refining process, and yellowish-white slag is made in total analysis, and the result according to a sample analysis carries out trimming, presses the silicon-calcium wire of 1.7-2.0m/t before the tapping
Keep the little argon gas amount of top of the slag fine motion to stir more than the 12min after the refining.The little argon gas amount of described fine motion refers to that argon flow amount is 50-150NL/min.
(4) in the casting process, the baking of tundish temperature is 1100 ℃, and crystallizer is to arc, and mouth of a river centering meets the requirements; water coolant is respond well, and the crystallizer mould flux is adopted in half protection cast; the composition of described crystallizer mould flux is CaO:27.0～28% by mass percentage, SiO
2: 21.0～22.0%, Al
2O
3: 11～12%, MgO:2～3%, Na
2O:6～7%, K
2O:0.5～0.6%, Fe
2O
3: 1.0～1.5%, F:4～5%, C are fixed/full carbon: 7～8%.The viscosity of covering slag is 0.31Pas, and fusing point is 1123 ℃, and molten speed is 42, and basicity is 1.25, and the consumption of covering slag is the 0.82kg/t steel.Pouring basket liquid level 700mm, liquid level fluctuation of crystallizer≤3mm, pulling rate is controlled at 0.85-0.9m/min.The liquidus temperature of Q345E is 1516 ℃, and the tundish superheating temperature is by 20～30 ℃ of controls, and middle bag the first furnace temperature is controlled at 1546～1556 ℃, and even watering heat is controlled at 1536～1546 ℃, and casting blank specification is 555 * 440 * 90mm, and pulling rate is 0.9m/min.
(5) because this steel grade crack sensitivity is strong, for guaranteeing that into stove Hot Metal in Beam Blank surface quality require Hot Metal in Beam Blank all to roll off the production line by an inspection, slight crackle appears in Hot Metal in Beam Blank, in time obtains reconditioning, it is rolling all to be transported to the shove charge of shaped steel process furnace after the reconditioning.(6) 1240～1270 ℃ of the soaking temperatures of process furnace, start rolling temperature is for being that 1170 ℃, web central authorities are 1150 ℃ in the edge of a wing outside, the finishing temperature edge of a wing outside is that 950 ℃, web central authorities are 830 ℃, stocking cools off after going out the TM machine fast, fast cold final temperature general control is at 500～600 ℃, and the specification of stocking is the H shaped steel of H250*250, H340*250.
(7) the chemical component weight per-cent of steel sees Table 1, and the converter steelmaking process recorder sees Table 2, and the refining process recorder sees Table 3, and the casting process recorder sees Table 4, and stocking mechanical property recorder sees Table 5.
Embodiment 2
Step 1) composition of described synthetic slag is CaO:55% by weight percentage, SiO
2: 13%, Al
2O
3: 22%, MgO:10%.The composition of described modification agent is CaO:40% by weight percentage, SiO
2: 8%, Al
2O
3: 35%, MgO:6%, Al:14%.
Embodiment 3
Step 1) composition of described synthetic slag is CaO:50% by weight percentage, SiO
2: 10%, Al
2O
3: 35%, MgO:8%.The composition of described modification agent is CaO:50% by weight percentage, SiO
2: 5%, Al
2O
3: 20%, MgO:7%, Al:18%.
Table 1: the chemical component weight per-cent % of steel
| Embodiment | C | Si | Mn | P | S | Nb |
| 1 | 0.14 | 0.19 | 1.29 | 0.015 | 0.012 | 0.022 |
| 2 | 0.14 | 0.22 | 1.30 | 0.014 | 0.009 | 0.022 |
| 3 | 0.14 | 0.18 | 1.26 | 0.010 | 0.012 | 0.022 |
Table 2 converter steelmaking process recorder
Table 3: refining process recorder
Table 4: casting process recorder
Table 5: stocking mechanical property recorder
Claims (4)
1. a low temperature resistant structure is with the preparation method of H shaped steel, comprises that desulfurization, 120 tons of top and bottom combined blown converter smeltings, LF refining, casting for shaped blank continuous, large H-shaped steel are rolling, it is characterized in that,
The weight percentage of element is C 0.12～0.22% in the steel, and Si 0.10～0.40%, and Mn 1.1～1.50%, P≤0.025%, and S≤0.025%, Nb 0.02～0.05%; All the other are iron and trace impurity;
Comprise the following steps:
1) adopt wash heat refining and slag modification technology in the converter tapping process:
Ratio in 4～8kg/t steel before the tapping adds synthetic slag in ladle, the ratio in 0.5～2kg/t steel adds modification agent on the slag surface after the tapping; The composition of described synthetic slag is CaO:40～60% by weight percentage, SiO
2: 5～15%, Al
2O
3: 15～35%, MgO:5～10%; The composition of described modification agent is CaO:30～50% by weight percentage, SiO
2: 5～10%, Al
2O
3: 20～35%, MgO:6～15%, Al:5～20%;
2) carry out refining at the LF ladle:
First abundant stirringization slag in the refining process, then get sample one time, total analysis, make yellowish-white slag, result according to a sample analysis adds alloy from feed bin, carries out trimming, ratio in 1.0～2.0m/t steel before the tapping adds silicon-calcium wire, keeps the little argon gas amount of top of the slag fine motion to stir more than the 10min after the refining; Oxygen level in the molten steel is≤10ppm,
3) continuous casting:
In the casting process, superheating temperature is controlled at 20～30 ℃, and the baking of tundish temperature is 900-920 ℃, and crystallizer is to arc, mouth of a river centering, water quench, the crystallizer mould flux is adopted in half protection cast, and the viscosity of covering slag is 0.30～0.35Pas, fusing point is 1120～1125 ℃, molten speed is 40-45, and basicity is 1.1～1.3, and the consumption of covering slag is 0.70～0.85kg/t steel; Pouring basket liquid level 700mm, liquid level fluctuation of crystallizer≤3mm, pulling rate is controlled at 0.75～1.1m/min;
4) rolling:
1200～1300 ℃ of the soaking temperatures of process furnace, start rolling temperature is for being that 1100～1180 ℃, web central authorities are 1100～1170 ℃ in the edge of a wing outside, the finishing temperature edge of a wing outside is that 850～960 ℃, web central authorities are 800～880 ℃, stocking cools off after going out the TM machine fast, and fast cold final temperature is controlled at 500～600 ℃.
2. low temperature resistant structure as claimed in claim 1 is characterized in that: step 2 with the preparation method of H shaped steel) the little argon gas amount of described fine motion refers to that argon flow amount is 50～150NL/min; Keep the little argon gas amount of top of the slag fine motion to stir 10～30min after the refining.
3. low temperature resistant structure as claimed in claim 2 is characterized in that: step 2 with the preparation method of H shaped steel) keep the little argon gas amount of top of the slag fine motion to stir 12～25min after the refining.
4. low temperature resistant structure as claimed in claim 1 is characterized in that: the cogging of rolling deformation system employing heavy reduction, heavy reduction rate finish to gauge with the preparation method of H shaped steel; Heavy reduction rate finish to gauge refers in last 2 passages of finish to gauge, requires quick continuous rolling, to realize that last 2 roads accumulation draft as 30%～40%, is controlled at 60%～70% with the last pass deflection.
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