CN108286008B - A kind of low temperature high-strength tenacity is hot rolled H-shaped and preparation method thereof - Google Patents
A kind of low temperature high-strength tenacity is hot rolled H-shaped and preparation method thereof Download PDFInfo
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Abstract
A kind of low temperature high-strength tenacity is hot rolled H-shaped and preparation method thereof, chemical component presses mass fraction: C:0.05~0.17%, Si:0.15~0.35%, Mn:1.0~2.0%, P:0.005~0.015%, S:0.005~0.015%, N:0.003~0.007%, O:0.002~0.005%, Ti:0.01~0.02%, Al:0.005~0.015%, Mg:0.001~0.005%, B:0.001~0.002%, Cr:0~0.5%, Mo:0~0.5%, surplus is Fe and impurity element, Ti, Mg, O and N meets: 2N≤Ti+1.3 × Mg-2 × O≤4N；Method: 1) being smelted into molten steel for molten iron and/or steel scrap, carries out pre-deoxidation alloying and deep deoxidation；Then LF refining is carried out, micron-sized oxide is generated；Casting for shaped blank continuous；2) heating and thermal insulation；3) roughing and finish rolling are carried out；4) it is hot rolled H-shaped that low temperature high-strength tenacity is obtained after cooling down；Its yield strength is 400~600MPa, -50 DEG C of impact flexibility >=100J.
Description
Technical field
The invention belongs to H profile steel production technical field, in particular to a kind of low temperature high-strength tenacity is hot rolled H-shaped and its makes
Preparation Method.
Background technique
H profile steel is a kind of economic section high efficiency section bar, has that modulus of section is big, bending resistance is strong, construction is simple, saves steel
The advantages that material and lightweight construction, has been widely used in the industries such as building, bridge, ship, chemical industry.Hot rolled H-shaped and welding
Fashioned iron reduces metal and energy consumption compared to that can save preparation section, improves production efficiency, therefore is that most important H profile steel is raw
Production method.But since H profile steel cross sectional shape is special, rolling deformation carries out at a relatively high temperature, and passage deforms
Measure it is small, different parts deformation and non-uniform temperature be just more difficult to sufficiently realize Unhydrated cement especially for think gauge fashioned iron
Low temperature rolling brings difficulty for the uniform refinement of tissue and comprehensive improve of toughness and tenacity.It is hot rolled H-shaped micro- to improve
Microstructure and mechanical property, people are explored and have been improved in terms of alloying component, smelting process, rolling and cooling technique.
Patent document CN101925685A discloses a kind of toughness, the high-strength thick steel of excellent weldability and high-intensitive special
The preparation method of thick h shape steel and they adds after dissolved oxygen is adjusted to 0.005~0.015wt.% by pre-deoxidation in smelting
Add Ti deoxidation, then progress 30 minutes or more Fruit storages, form fine oxide containing Ti, pinning crystal boundary in steel
Thinning microstructure, to improve the toughness of special thicker steel.The above method need in advance by Oxygen Content in Liquid Steel be adjusted to a certain range it
It is interior, and need to be vacuum-treated, it is complicated for operation, bring the difficulty in production.
Patent document CN102418037A discloses a kind of hot rolled H-shaped and its preparation side with anti-lamellar tearing performance
Method, molten steel does not use Al deoxidation, and uses Si calmness deoxidation, at least one of Ti and Zr is added, then to carry out to field trash
It is effectively rotten, improve steel Z-direction performance.But due to not using Al deep deoxidation, oxygen content in steel is higher, large scale folder easy to form
Sundries reduces the cleanliness of steel.
Patent document CN102644020A discloses a kind of hot rolled H-shaped roller repairing of yield strength 500MPa level low alloy
Then method carries out two-part and is quickly cooled down to obtain carefully by Nb microalloying and low temperature rolling fining austenite grains
The phase-change organization of change.In addition, patent document CN104831154A discloses a kind of H profile steel and its production method, using V microalloy
Change, carry out low temperature rolling, can satisfy -50 DEG C of low-temperature flexibility requirements.The above method uses addition Nb, V alloy element, and
Low temperature rolling is carried out, cost of alloy and mill load is increased, influences production efficiency.
In the technology of the current hot rolled H-shaped structure property of improvement, followed closely by forming fine oxide in smelting process
It is complicated to implement means, and is difficult to obtain optimal inclusion distribution for the method for pricking crystal grain, influences tissue thinning effect；And it adopts
With the method for addition alloy and zerolling, hence it is evident that will increase production cost, and affected to equipment operation and production efficiency.
Therefore, it is necessary in view of the above-mentioned problems, carrying out hot rolled H-shaped production technology improvement and innovation, reduction production cost improves production effect
Rate saves energy consumption, and significantly improves obdurability comprehensive mechanical property.
Summary of the invention
In view of the deficiencies of the prior art, it is hot rolled H-shaped and preparation method thereof to provide a kind of low temperature high-strength tenacity by the present invention,
It solves the problems such as effective field trash is difficult to control, structure property ability of regulation and control is insufficient in H profile steel, is reducing cost of alloy, improving
Significantly improving for hot rolled H-shaped obdurability is realized under conditions of production efficiency.
A kind of chemical component that low temperature high-strength tenacity is hot rolled H-shaped presses mass fraction are as follows: C:0.05~0.17%, Si:
0.15~0.35%, Mn:1.0~2.0%, P:0.005~0.015%, S:0.005~0.015%, N:0.003~
0.007%, O:0.002~0.005%, Ti:0.01~0.02%, Al:0.005~0.015%, Mg:0.001~0.005%,
B:0.001~0.002%, Cr:0~0.5%, Mo:0~0.5%, surplus are Fe and impurity element, wherein Ti, Mg, O and N
Mass fraction meets relational expression: 2N≤Ti+1.3 × Mg-2 × O≤4N.
The low temperature high-strength tenacity is hot rolled H-shaped, and the amount of inclusions in steel having a size of 0.2~5 μm is ruler in steel
50 times or more of the very little the amount of inclusions for being greater than 5 μm having a size of 0.1~1 μm and contain MgAl in steel2O4The field trash of oxide
1000/mm of quantity >2, having a size of 0.3~3 μm and contain TiO in steelx500/the mm of the amount of inclusions > of oxide2。
The low temperature high-strength tenacity is hot rolled H-shaped, yield strength be 400~600MPa, -50 DEG C of impact flexibility >=
100J, microscopic structure are Intragranular Acicular Ferrite and/or transgranular bainite type tissue.
A kind of preparation method that low temperature high-strength tenacity is hot rolled H-shaped, the specific steps are as follows:
Step 1, it smelts:
(1) molten iron and/or steel scrap are smelted into molten steel, use Si and Mn to carry out pre-deoxidation alloying in tapping process,
Deep deoxidation is carried out using silico-calcium or Al；
(2) LF refining being carried out to molten steel after deoxidation, produces white slag in refining process, the white slag desulfurization retention time is 10~
20min；Al content is adjusted after desulfurization to 0.005~0.015wt.%, feeds Ti-Mg-O core-spun yarn, soft blow inert gas or nitrogen
10~20min of gas generates micron-sized oxide in molten steel；
(3) the requirement accurate adjustment molten steel composition hot rolled H-shaped by low temperature high-strength tenacity after refining, carries out Hot Metal in Beam Blank
Continuous casting obtains continuous casting billet；
Step 2, it heats:
Continuous casting billet is heated to 1250~1300 DEG C, soaking time is 30~240min；
Step 3, it rolls:
Roughing and finish rolling are carried out to the continuous casting billet after heating, roughing start rolling temperature is 1200~1250 DEG C, the finish rolling finish to gauge wing
Edge temperature is 1050~1150 DEG C, 1000~1100 DEG C of web temperature, and H profile steel is made；
Step 4, cooling:
Roll rear H profile steel be cooled to the cooling rate of 1~10 DEG C/s it is air-cooled after 450 DEG C or less, or with the cooling rate of 5~20 DEG C/s
It is air-cooled again after being cooled to 570~670 DEG C, it is hot rolled H-shaped to obtain low temperature high-strength tenacity.
The hot rolled H-shaped preparation method of above-mentioned low temperature high-strength tenacity, in which:
In the step 1, when raw material is steel scrap, using electric furnace smelting, when raw material is molten iron, using converter smelting,
When raw material is the mixture with steel scrap, using electric furnace or converter smelting.
In the step 1, steel scrap is non-alloyed or low-alloy steel scrap, Pb, As, Sb, Bi, Sn content summation < in steel scrap
0.2wt.%, Cu, Ni, Cr, Mo content distinguish < 0.5wt.%.
In the step 1, adjustment Al content is realized by addition aluminum shot, aluminum steel or aluminium powder.
In the step 1, LF refining carries out residue adjustment using aluminum shot, calcium carbide or ferrosilicon powder.
In the step 1, after deep deoxidation, dissolved oxygen is 1~10ppm in steel.
In the step 1, the Ti-Mg-O core-spun yarn of feeding is mixed by titanium ferroally powder, Si-Mg alloy powder and brown iron oxide
Filling is made, and wherein ferro-titanium accounts for 20~30wt.%, Si-Mg alloy accounts for 35~45wt.%, iron oxide accounts for 30~40wt.%,
150~200m/min of feeding speed makes 20~60ppm of molten steel total oxygen demand.
In the step 1, after LF refining, having a size of 5 μm or more of the amount of inclusions < 10 in steel5A/cm3, LF terminal is molten
Oxygen is solved in 1~10ppm.
In the step 1, refining cycle is 50~70min.
In the step 1, refining feeds 100~300m calcium line into molten steel after terminating and carries out Calcium treatment, soft blow after line feeding
6~15min of inert gas or nitrogen.
In the step 1, oxide contains the MgAl having a size of 0.1~5 μm in molten steel after refining2O4、TiOxAnd the two
Composite oxides, and MgAl2O4、TiOxAnd the composite oxides quantity of the two accounts for 50% of oxide quantity or more.
In the step 3, roughing is carried out using roughing mill, finish rolling is carried out using universal finishing mill, the operation of rolling is needless to say warm
It is cooling.
The hot rolled H-shaped preparation method of above-mentioned low temperature high-strength tenacity, the design philosophy of technical solution are as follows:
The difficult point that the present invention improves from hot rolled H-shaped production technology characteristic and toughness and tenacity, carries out ingredient decrement
Change design and the control of key component, using conventional structure property regulatory mechanism is different from, passes through the collaboration of full process stream journey
It improves, had not only given full play to the production capacity of smelting and rolling process, but also the H profile steel product that availability is excellent.
This programme use lower C and medium Mn content, using cheap element strengthen matrix, and guarantee compared with low-carbon-equivalent with
Improve weldability；Utilize MgAl2O4、TiOxOxide plays pinning austenite grain and promotes the main of Intragranular Acicular Ferrite phase transformation
Effect, and predetermined size is in the quantitative proportion of 0.2~5 μm and 5 μm or more field trash, to play fine oxide to the thin of tissue
Change effect, avoids the adverse effect to matrix；When Ti, Mg, O, N meet required content range and relational expression 2N≤Ti+1.3
When × Mg-2 × O≤4N, best oxide and nitride distribution can get, reduce solid solution nitrogen to the adverse effect of toughness,
And guarantee the performance of boron element effect；Micro B is added and is remarkably improved bainite harden ability, inhibits the generation of grain boundary ferrite,
Facilitate above-mentioned oxide and promotes intergranular structure's transformation.It can be obtained under the conditions of H profile steel high temperature rolling using this programme component system
Microstructure, lead to peroxide induced Intragranular Acicular Ferrite forming core and realize refined crystalline strengthening and build up, at the same improve intensity and
Low-temperature flexibility realizes significantly improving for toughness and tenacity under conditions of not adding the precious alloys such as Nb, V.
To obtain above-mentioned effective oxide distribution in smelting process, it is complicated for method in current means, be not easy it is accurate
The problems such as control, this programme are being added Al deep deoxidation, are then feeding Ti-Mg-O core-spun yarn using Si and Mn pre-deoxidation is first added
Method, required oxide can be to easily and reliably generated in steel, and keep the structure composition of oxide more reasonable, point
Cloth is finer uniformly, and the effect of structure refinement is made to obtain performance to a greater extent.In rolling sequence, and generally use at present
The thinking of zerolling without centre to temperature or cooling, was both protected on the contrary, rolling sequence bulk temperature improves as far as possible in this programme
Rhythm of production has been held, and has reduced mill load and saves energy consumption, the recrystallization or non-recrystallization refinement of austenite has not been needed, only needs
The transgranular phase-change organization that can be obtained fine uniform structure under weaker water cooling condition, inhibits the formation of coarse friable tissues, and normal
The polygonal ferrite tissue for advising H profile steel, which is compared, has more preferably toughness and tenacity.
A kind of low temperature high-strength tenacity of the invention is hot rolled H-shaped and preparation method thereof, compared with prior art, advantage
And it has the beneficial effect that
1, the component system of steel of the present invention is designed specifically for the production technology, is not required to the refined crystalline strengthenings such as addition Nb, V
With precipitation strength element, alloy low cost is, it can be achieved that H profile steel toughness and tenacity and the comprehensive of welding performance are improved.
2, the control method of oxide is simple and reliable in the present invention, and it is complicated, not easy to control to overcome method in routine techniques
The shortcomings that, and the composition of oxide and distribution are more reasonable under this programme technique, more preferably to the function and effect of structure refinement.
3, the present invention is deformed using high temperature rolling, different from the thinking of common zerolling fining austenite grains, and
And needless to say temperature is cooling for the operation of rolling, reduces equipment energy consumption, improves production efficiency.
Even if steel of the present invention still obtains microstructure, has both 4, in minimizing component system and under the conditions of without zerolling
High-intensitive and superior low-temperature toughness, overcomes general hot rolled H-shaped production technology and performance improvement is difficult to the problem of coordinating and optimizing.
Detailed description of the invention
Hot rolled H-shaped typical microstructures prepared by Fig. 1 embodiment of the present invention 3.
Specific embodiment
The specific embodiment of the present invention program is discussed in detail below by embodiment.
A kind of chemical component that low temperature high-strength tenacity is hot rolled H-shaped presses mass fraction are as follows: C:0.05~0.17%, Si:
0.15~0.35%, Mn:1.0~2.0%, P:0.005~0.015%, S:0.005~0.015%, N:0.003~
0.007%, O:0.002~0.005%, Ti:0.01~0.02%, Al:0.005~0.015%, Mg:0.001~0.005%,
B:0.001~0.002%, Cr:0~0.5%, Mo:0~0.5%, surplus are Fe and impurity element, wherein Ti, Mg, O and N
Mass fraction meets relational expression: 2N≤Ti+1.3 × Mg-2 × O≤4N, and each specific ingredient of embodiment is as shown in table 1.
A kind of preparation method that low temperature high-strength tenacity is hot rolled H-shaped, the specific steps are as follows:
Step 1, it smelts:
(1) by molten iron by electro-smelting at molten steel, carry out pre-deoxidation alloying using Si and Mn in tapping process, use
Silico-calcium or A1 carry out deep deoxidation, and dissolved oxygen is as shown in table 3 in steel；
(2) LF refining is carried out to molten steel after deoxidation, uses aluminum shot, calcium carbide or ferrosilicon powder to produce white slag in refining process,
The white slag desulfurization retention time is as shown in table 3；It is as shown in table 3 that Al content is adjusted after desulfurization, is fed by titanium ferroally powder, Si-Mg alloy
Powder and brown iron oxide, which mix, fills manufactured Ti-Mg-O core-spun yarn, soft argon blowing time, molten steel total oxygen demand, refining cycle such as 3 institute of table
Show, the MgAl having a size of 0.1~5 μm is generated in molten steel2O4、TiOxAnd the composite oxides of the two, make in each embodiment steel
Inclusion distribution is as shown in table 2；
(3) the requirement accurate adjustment molten steel composition hot rolled H-shaped by low temperature high-strength tenacity, specific ingredient is as shown in table 1, refining
After, LF terminal dissolved oxygen is as shown in table 3, carries out casting for shaped blank continuous, obtains continuous casting billet；
Step 2, it heats:
Continuous casting billet is heated and kept the temperature, design parameter is as shown in table 4；
Step 3, it rolls:
Roughing is carried out using roughing mill to the continuous casting billet after heating, finish rolling is carried out using universal finishing mill, the operation of rolling is not
It is cooling to temperature, H profile steel is made, roughing start rolling temperature, finish rolling finish to gauge edge of a wing temperature, web temperature are as shown in table 4；
Step 4, cooling:
Rear H profile steel is rolled by air-cooled after water cooling, and it is hot rolled H-shaped to obtain low temperature high-strength tenacity, cooling velocity and cold eventually
Temperature is as shown in table 4.
The chemical component (wt.%) of 1 various embodiments of the present invention of table
Inclusion distribution feature in each embodiment of table 2
The smelting parameter of each embodiment of table 3
The rolling technological parameter of each embodiment of table 4
Low temperature high-strength tenacity prepared by the present invention is hot rolled H-shaped, yield strength, -50 DEG C of impact flexibility such as 5 institute of table
Show, microscopic structure is Intragranular Acicular Ferrite and/or transgranular bainite type tissue, can meet the performance requirement of low temperature structure steel.
As shown in Figure 1, the microscopic structure of H profile steel prepared by embodiment 3 and conventional hot rolled H-shaped polygonal ferrite tissue
Difference belongs to Intragranular Acicular Ferrite and bainite type tissue, and crystallite dimension refinement is uniform, conducive to significantly improving for obdurability.
The mechanical property of each embodiment of table 5
| Embodiment | Yield strength/MPa | Impact flexibility/J (- 50 DEG C) |
| 1 | 510 | 160 |
| 2 | 525 | 155 |
| 3 | 450 | 208 |
| 4 | 443 | 210 |
| 5 | 585 | 120 |
| 6 | 570 | 135 |
Claims (8)
1. a kind of preparation method that low temperature high-strength tenacity is hot rolled H-shaped, which is characterized in that specific step is as follows:
Step 1, it smelts:
(1) molten iron and/or steel scrap are smelted into molten steel, use Si and Mn progress pre-deoxidation alloying, use in tapping process
Silico-calcium or Al carry out deep deoxidation:
(2) LF refining is carried out to molten steel after deoxidation, white slag is produced in refining process, the white slag desulfurization retention time is 10~20min；
Al content is adjusted after desulfurization to 0.005~0.015wt.%, feeds Ti-Mg-O core-spun yarn, soft blow inert gas or nitrogen 10~
20min generates micron-sized oxide in molten steel；
(3) the requirement accurate adjustment molten steel composition hot rolled H-shaped by low temperature high-strength tenacity after refining, carries out casting for shaped blank continuous,
Obtain continuous casting billet:
Step 2, it heats:
Continuous casting billet is heated to 1250~1300 DEG C, soaking time is 30~240min；
Step 3, it rolls:
Roughing and finish rolling are carried out to the continuous casting billet after heating, roughing start rolling temperature is 1200~1250 DEG C, finish rolling finish to gauge edge of a wing temperature
Degree is 1050~1150 DEG C, 1000~1100 DEG C of web temperature, and H profile steel is made；
Step 4, cooling；
It rolls air-cooled after rear H profile steel is cooled to 450 DEG C or less with the cooling rate of 1~10 DEG C/s or cooling with the cooling rate of 5~20 DEG C/s
It is air-cooled again after to 570~670 DEG C, it is hot rolled H-shaped to obtain low temperature high-strength tenacity；
The hot rolled H-shaped chemical component of the low temperature high-strength tenacity presses mass fraction are as follows: C:0.05~0.17%, Si:0.15
~0.35%, Mn:1.0~2.0%, P:0.005~0.015%, S:0.005~0.015%, N:0.003~0.007%, O:
0.002~0.005%, Ti:0.01~0.02%, Al:0.005~0.015%, Mg:0.001~0.005%, B:0.001~
0.002%, Cr:0~0.5%, Mo:0~0.5%, surplus are Fe and impurity element, and wherein the mass fraction of Ti, Mg, O and N are full
Sufficient relational expression: 2N≤Ti+1.3 × Mg-2 × O≤4N；
The low temperature high-strength tenacity is hot rolled H-shaped, and the amount of inclusions in steel having a size of 0.2~5 μm is that size is greater than 5 in steel
μm 50 times or more of the amount of inclusions, having a size of 0.1~1 μm and contain MgAl in steel2O4The amount of inclusions > of oxide
1000/mm2, 500/mm of the amount of inclusions > in steel having a size of 0.3~3 μm and containing TiOx oxide2；What is prepared is low
Warm high-strength tenacity is hot rolled H-shaped, and yield strength is 400~600MPa, and -50 DEG C of impact flexibility >=100J, microscopic structure is crystalline substance
Interior ferrite and/or transgranular bainite type tissue.
2. a kind of preparation method that low temperature high-strength tenacity is hot rolled H-shaped according to claim 1, which is characterized in that institute
It states in step 1, steel scrap is non-alloyed or low-alloy steel scrap, Pb, As, Sb, Bi, Sn content summation ﹤ 0.2wt.%, Cu in steel scrap,
Ni, Cr, Mo content distinguish ﹤ 0.5wt.%.
3. a kind of preparation method that low temperature high-strength tenacity is hot rolled H-shaped according to claim 1, which is characterized in that institute
It states in step 1, LF refining carries out residue adjustment using aluminum shot, calcium carbide or ferrosilicon powder.
4. a kind of preparation method that low temperature high-strength tenacity is hot rolled H-shaped according to claim 1, which is characterized in that institute
It states in step 1, after deep deoxidation, dissolved oxygen is 1~10ppm in steel.
5. a kind of preparation method that low temperature high-strength tenacity is hot rolled H-shaped according to claim 1, which is characterized in that institute
It states in step 1, the Ti-Mg-O core-spun yarn of feeding mixes filling by titanium ferroally powder, Si-Mg alloy powder and brown iron oxide and is made,
Middle ferro-titanium accounts for 20~30wt.%, Si-Mg alloy accounts for 35~45wt.%, iron oxide accounts for 30~40wt.%, feeding speed 150
~200m/min makes 20~60ppm of molten steel total oxygen demand.
6. a kind of preparation method that low temperature high-strength tenacity is hot rolled H-shaped according to claim 1, which is characterized in that institute
It states in step 1, after LF refining, having a size of 5 μm or more of the amount of inclusions ﹤ 10 in steel5A/cm3, LF terminal dissolved oxygen 1~
10ppm。
7. a kind of preparation method that low temperature high-strength tenacity is hot rolled H-shaped according to claim 1, which is characterized in that institute
It states in step 1, oxide contains the MgAl having a size of 0.1~5 μm in molten steel after refining2O4, TiOx and the two combined oxidation
Object, and MgAl2O4, TiOx and the two composite oxides quantity account for 50% of oxide quantity or more.
8. a kind of preparation method that low temperature high-strength tenacity is hot rolled H-shaped according to claim 1, which is characterized in that institute
State in step 1, refining terminate after into molten steel feed 100~300m calcium line carry out Calcium treatment, after line feeding soft blow inert gas or
6~15min of nitrogen.
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| CN109338227A (en) * | 2018-11-21 | 2019-02-15 | 包头钢铁（集团）有限责任公司 | Low temperature resistant H profile steel of a kind of 275MPa grades of boracic hot rolling and preparation method thereof |
| CN109797343A (en) * | 2019-01-22 | 2019-05-24 | 山东钢铁股份有限公司 | A kind of low-alloy high-strength hot strip rolling and preparation method thereof suitable for extremely cold area |
| CN110079728B (en) * | 2019-04-09 | 2020-07-10 | 东北大学 | High-strength twisted steel with good weldability and manufacturing method thereof |
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| CN112267005B (en) * | 2020-09-23 | 2022-05-31 | 舞阳钢铁有限责任公司 | Steel-making method for welding steel plate with large heat input |
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