CN102418037A - Hot-rolled H-section steel with lamellar tearing resistance and manufacturing method thereof - Google Patents
Hot-rolled H-section steel with lamellar tearing resistance and manufacturing method thereof Download PDFInfo
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- CN102418037A CN102418037A CN2011103945822A CN201110394582A CN102418037A CN 102418037 A CN102418037 A CN 102418037A CN 2011103945822 A CN2011103945822 A CN 2011103945822A CN 201110394582 A CN201110394582 A CN 201110394582A CN 102418037 A CN102418037 A CN 102418037A
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Abstract
The invention provides hot-rolled H-section steel with lamellar tearing resistance and a production method thereof. According to the method for manufacturing H-section steel provided by the invention, Al is not used for deoxidation, Si is added to molten steel in a tapping process, thus the content of Si in the molten steel is adjusted to 0.10-0.15% of the total weight of the molten steel and silicon killing deoxidation is carried out, and then a preset amount of at least one of Ti and Zr is added to the molten steel, wherein the Si content required by the steel can be realized by supplementing Si during refining. According to the invention, the hot-rolled H-section steel has lamellar tearing resistance, can satisfy the Z-direction performance requirement in a certain thickness direction, and can be applied to high-rise buildings, wide-span venues and other steel structural engineering fields.
Description
Technical field
The invention belongs to the stress metal manufacture field, specifically, the present invention relates to a kind of hot rolled H-shaped and method of manufacture with anti-lamellar tearing performance.
Background technology
Anti-lamellar tearing performance steel is claimed Z again to steel, and it mainly adopts the relative reduction in area Z of steel plate thickness direction tension test to estimate anti-lamellar tearing ability.For guaranteeing the security of steel member, for the steel of thickness,, generally all need carry out Z to performance checking as long as structural part produces pulling force or fatigue stress along the thickness of slab direction greater than 15mm, promptly the anti-lamellar tearing ability on the thickness direction is tested.
For H shaped steel; Its mechanics distributes rationally, the profile cross-section coefficient is big, supporting capacity is big, is convenient to assembly unit and rivet welding, therefore; H shaped steel distributes the rational more efficient section bar of economic section of optimization, the ratio of strength to weight more as a kind of section area, has obtained using widely.Along with social progress and development in science and technology; The buildings of various Highrise buildingss, high-rise building and various special purposes is more and more; Also increasingly high to each item performance requriements of construction(al)steel thus; Particularly when the buildings stressing conditions is complicated, the Z of construction(al)steel to performance requirement has been proposed, to guarantee stability, the security of building structure.
Present anti-lamellar tearing product made from steel mainly is a sheet material, all takes welding process to obtain for the H shaped steel product that requires to have anti-lamellar tearing performance requriements.Yet in welding process, the reduction of the performance index of welded heat affecting zone and weld seam is unavoidable.And the processing welding process also will produce certain expense, and the performance measurement of position while welding simultaneously, flaw detection all need expense, have prolonged the construction period simultaneously.
Summary of the invention
In order to solve the problems referred to above that prior art exists, the invention provides a kind of hot rolled H-shaped and working method that satisfies anti-lamellar tearing performance requriements.
According to an aspect of the present invention; A kind of hot rolled H-shaped method of manufacture with anti-lamellar tearing performance is provided; The step that this method comprises is: adopt converter or electric arc furnace that molten iron, steel scrap or molten iron and steel scrap are tapped after melting; Wherein, in tapping process, in molten steel, adding Si accounts for 0.10%～0.15% of molten steel gross weight and carries out the calm deoxidation of silicon so that the Si in the molten steel is adjusted to; Then, in molten steel, add at least a among Ti and the Zr of predetermined amount, then carry out ladle refining and add Si, make strand through continuous casting subsequently according to the needs of steel grades; Then, steel billet is heated to 1150 ℃～1300 ℃ and be incubated for some time; Utilize universal mill that strand is rolled into H shaped steel, last air cooling, thus obtain said hot rolled H-shaped.
According to the present invention, only use the calm deoxidation of Si, to keep the melting chemical composition Als＜0.010wt% of steel.
According to the present invention, Ti that adds after the calm deoxidation of use Si and at least a content among the Zr account for 0.0001%～0.030% of molten steel gross weight.
According to a further aspect in the invention; A kind of hot rolled H-shaped according to the anti-lamellar tearing performance of having of method of manufacture manufacturing recited above is provided; Wherein, Said hot rolled H-shaped chemical ingredients is by weight percentage: 0.06%～0.20% C, 0.10%～0.50% Si, 0.4%～1.6% Mn, be less than and equal 0.025% P, be less than and equal 0.010% S, be less than and equal 0.06% Nb, be less than and equal 0.15% V, 0.0001%～0.030% Ti and/or Zr, be less than 0.010% Als, surplus is Fe and unavoidable impurities.
According to the hot rolled H-shaped excellent anti-lamellar tearing performance that has of the present invention, the Z that can satisfy certain thickness direction can be applicable to Steel Structure Work fields such as Highrise buildings, large span venue to performance requriements.
Embodiment
According to the present invention; The setting of the main alloy element content in the H shaped steel and the following principle of method of manufacture foundation: because the influence of strand center segregation, inclusion or harmful element can cause the anti-lamellar tearing performance of thickness of steel product direction to reduce; Therefore, the content that the key that the present invention solves the steel plate tearing defect is to adopt dissolved oxygen in the molten steel of the calm method adjustment of Si smelting process adds an amount of Ti, Zr or Ti-Zr alloy then and handles; Carry out effectively rotten to the inevitable impurity that exists in the steel; Particle is tiny to form, disperse distributes and rounded inclusion, and eliminates harmful inclusion of concentrating distribution, particle big (general diameter >=5 μ m), simultaneously; Reduce steel billet center segregation degree, improve steel product quality, avoid occurring in the steel use lamellar tearing phenomenon of thickness direction.
In addition; The present invention utilizes Si killed steel liquid; And through beginning that in refining the preceding content of Si is controlled at 0.10wt%-0.15wt% to regulate the dissolved oxygen content in the molten steel; The Ti that makes it and add, Zr or the reaction of Ti-Zr steel alloy form thin abundant composite oxide particle, are used as the particle of intracrystalline ferritic forming core; Simultaneously sulfide in the steel is carried out effectively rottenly, become harmful inclusion and be harmless inclusion, improve the tear resistance of steel.Therefore, different according to the method for manufacturing H shaped steel of the present invention with existing method, do not adopt the Al deoxidation, but only use the calm deoxidation of Si, that is, in tapping process, come calm molten steel to carry out deoxidation through adding Si.In addition, the Si content of steel grade needs can be added when refining.
The hot rolled H-shaped method of manufacture that has anti-lamellar tearing performance according to of the present invention will be described in detail belows.
According to the present invention; Hot rolled H-shaped method of manufacture with anti-lamellar tearing performance comprises the following steps that order is carried out: adopt converter or electric arc furnace that molten iron, steel scrap or molten iron and steel scrap are tapped after melting; Wherein, In tapping process, in molten steel, add Si and account for 0.10%～0.15% of molten steel gross weight and carry out the calm deoxidation of silicon, then, in molten steel, add at least a among Ti and the Zr of predetermined amount so that the Si in the molten steel is adjusted to; Then carry out ladle refining and add Si, make strand through continuous casting subsequently according to the needs of steel grades; Then, steel billet is heated to 1150 ℃～1300 ℃ and be incubated for some time; Utilize universal mill that strand is rolled into H shaped steel, last air cooling, thus obtain according to H shaped steel of the present invention.
According to the present invention, use the calm deoxidation alloying of Si, do not adopt to contain the Al material and carry out deoxidation and alloying, keep the melting chemical composition Als＜0.010wt% of steel.According to the present invention, use the calm deoxidation of Si, the smelting component that tapping process is pressed 0.10wt%～0.15wt% adds Si, adds Ti, Zr or the Ti-Zr alloy of 0.00010wt%～0.030wt% then, and the Si of steel grade can add at refining process as required.Here, can be respectively add at least a among Ti and the Zr with at least a form in Ti line and the Zr line, yet, the invention is not restricted to this.For example, according to one embodiment of present invention, can be respectively add at least a among Ti and the Zr in the steel of form after the calm deoxidation of Si with Fe-Ti alloy, Fe-Zr alloy or Fe-Ti-Zr alloy.
In addition, according to the present invention, the soaking temperature of strand is controlled at 1150 ℃～1300 ℃, the time is about 2 hours.Utilizing universal mill strand to be rolled in the process of H shaped steel, start rolling temperature is controlled to be 1100 ± 50 ℃, and finishing temperature is controlled at 830 ℃～950 ℃.According to the present invention, in the step of rolling the back air cooling, the time that naturally cools to normal temperature after rolling is about 2 hours.
H shaped steel through aforesaid method of the present invention is made can satisfy anti-lamellar tearing performance demands, and wherein, this hot rolled H-shaped web, the edge of a wing can reach more than 30% along the stretching relative reduction in area Z of thickness direction.According to one embodiment of present invention, the edge of a wing of the H shaped steel through above-mentioned manufacturing can be between 33%～51% along the stretching relative reduction in area Z of thickness direction.
Have the hot rolled H-shaped of anti-lamellar tearing performance according to of the present invention; Its chemical ingredients is by weight percentage: 0.06%～0.20% C, 0.10%～0.50% Si, 0.4%～1.6% Mn, be less than and equal 0.025% P, be less than and equal 0.010% S, be less than and equal 0.06% Nb, be less than and equal 0.15% V, 0.0001%～0.030% Ti and/or Zr, be less than 0.010% Als, surplus is Fe and unavoidable impurities.
To explain that below hot rolled H-shaped chemical ingredients according to the present invention is limited to the reason in the above-mentioned scope.
H shaped steel of the present invention in use has higher requirement to mechanical property, impelling strength, welding property and Z to performance (promptly anti-lamellar tearing performance).According to these request for utilizations, the present invention has carried out optimization design to steel grades, production technique.
According to the design concept of HSLA, modern welded construction requires HSLA that lower carbon equivalent is arranged.In order to control carbon equivalent, guarantee good welding property, carbon content is controlled in the scope of 0.06wt%～0.20wt%, and manganese content is controlled in the scope of 0.4wt%～1.6wt%.So both the mechanical property requirements that realizes at lower cost according to H shaped steel of the present invention can be reached, good welding property can be guaranteed again.
P content mainly influences the plasticity of steel, forms " cold short " easily, and S mainly influences the impelling strength and the tough-crisp transition temperature of steel, and in addition, sulfide inclusion influences the anisotropy of steel in the steel, causes the reduction of Z to performance.Therefore, S content is strict controlled in below the 0.010wt%, P content is strict controlled in below the 0.025wt%, thereby reduce inclusion, improve the plasticity and toughness of steel.
Nb, V are strong carbon, nitrogen compound forming element, can play the intensive strengthening effect.Simultaneously Nb can the delayed deformation austenite recrystallization, and the refinement ferrite crystal grain improves the obdurability of steel plate.Therefore, be less than the V that equals 0.150wt% according to requiring to add according to the toughness and tenacity of steel in the H shaped steel of the present invention, be less than at least a among the Nb that equals 0.060wt%, thereby improve each item performance of H shaped steel product.
Aluminium (Al) is steelmaking process deoxidant element commonly used, has the strong characteristics of deoxidizing capacity, has the effect of crystal grain thinning simultaneously.For the purity that improves steel and adjustment grain fineness number, when usually molten steel being carried out aluminium deoxidation, add the Al that aluminium carries out deoxidation and makes generation at the commitment of fusion process
2O
3Come-up is separated, thereby improves the cleanliness factor of molten steel, and this mainly is to be purpose with the oxygen concn that reduces molten steel and reduction as the initial oxide compound of deoxidation products.Yet, wherein as the part A l of deoxidation products
2O
3Still can remain in the molten steel, because Al
2O
3Reunite easily, cause the product flaw detection defective; And the molten steel of aluminium deoxidation causes nozzle clogging easily in the cast molding process.Therefore,, use the calm deoxidation alloying of Si, do not contain the Al material and carry out deoxidation and alloying and do not adopt, and keep the melting chemical composition Als＜0.010wt% of steel according to the present invention, so that the dissolved oxygen in the molten steel remains on reasonable levels, rather than low excessively.
To combine embodiment that the present invention is done further description below.These examples are just from illustrational purpose, but not intention restriction scope of the present invention.
Embodiment 1
Utilize the special-shaped base of near-net-shape to produce hot rolled H-shaped; The chemical ingredients of the special-shaped base of this near-net-shape is: the P of the Zr of the Mn of the C of 0.11wt%, the Si of 0.19wt%, 1.33wt%, the Ti of 0.007wt%, 0.004wt%, the Nb of 0.036wt%, 0.012wt%, the S of 0.006wt%, less than the Als of 0.003wt%, surplus is Fe and unavoidable impurities.
The production technique of present embodiment is following: adopt converter that molten iron is tapped after making steel, in tapping process, the Si in the molten steel is adjusted to 0.12wt%; Then, in molten steel, add the Fe-Ti-Zr alloy of predetermined amount, then carry out ladle refining and add the part ferrosilicon, liquid steel temperature is adjusted to tapping temperature carry out continuous casting, carry out hot rolling then according to the chemical ingredients and the content thereof of the special-shaped base of near-net-shape.
Hot rolling technology is, strand is heated to 1250 ℃ ± 30 ℃, and soaking is carried out hot rolling after about 2 hours, and rolling out specification is the H shaped steel of H900 * 300 * 14 * 26mm, rolls the back air cooling.
The ys of the H shaped steel of present embodiment manufacturing is 420MPa, the Z of position, the edge of a wing to performance greater than 39%.
Embodiment 2
Utilize the special-shaped base of near-net-shape to produce hot rolled H-shaped; Special-shaped base chemical ingredients of this near-net-shape and content thereof are: the S of the V of the Mn of the C of 0.16wt%, the Si of 0.27wt%, 1.49wt%, the Ti of 0.010wt%, 0.013wt%, the P of 0.019wt%, 0.007wt%, less than the Als of 0.005wt%, surplus is Fe and unavoidable impurities.
The production technique of present embodiment is following: adopt converter that molten iron is tapped after making steel, in tapping process, the Si in the molten steel is adjusted to 0.10wt%; Then, in molten steel, add the Fe-Ti alloy of predetermined amount, then carry out ladle refining and add the part ferrosilicon, liquid steel temperature is adjusted to tapping temperature carry out continuous casting, carry out hot rolling then according to the chemical ingredients and the content thereof of the special-shaped base of near-net-shape.
Hot rolling technology is, strand is heated to 1250 ± 30 ℃, and soaking is carried out hot rolling after about 2 hours, and rolling out specification is the H shaped steel of H600 * 300 * 14 * 23mm, rolls the back air cooling.
The ys of the H shaped steel of present embodiment manufacturing is 365MPa, the Z of position, the edge of a wing to performance greater than 36%.
Embodiment 3
It is hot rolled H-shaped to utilize rectangular bloom to produce; This rectangular bloom chemical ingredients and content thereof are: the Nb of the Mn of the C of 0.15wt%, the Si of 0.34wt%, 1.41wt%, the Ti of 0.011wt%, 0.032wt%, the P of 0.015wt%, the S of 0.009wt%, the Als of tracer level, surplus is Fe and unavoidable impurities.
The production technique of present embodiment is following: adopt converter that molten iron is tapped after making steel, in tapping process, the Si in the molten steel is adjusted to 0.15wt%; Then, in molten steel, add the Ti line of predetermined amount, then carry out ladle refining and add the part ferrosilicon, liquid steel temperature is adjusted to tapping temperature carry out continuous casting, carry out hot rolling then according to the chemical ingredients and the content thereof of the special-shaped base of near-net-shape.
Hot rolling technology is, strand is heated to 1260 ± 30 ℃, and soaking is carried out hot rolling after about 2 hours, and rolling specs is the H shaped steel of H400 * 200 * 8 * 13mm, rolls the back air cooling.
The ys of the H shaped steel of present embodiment manufacturing is 465MPa, and the Z of position, the edge of a wing is to performance more than 33%.
Therefore; H shaped steel according to the present invention have chemical ingredients simple, be easy to control, low, the characteristic of simple process of production cost; Manufacturing this hot rolled H-shaped has anti-lamellar tearing performance; The Z that can satisfy certain thickness direction can be applicable to Steel Structure Work fields such as Highrise buildings, large span venue to performance requriements.
The invention is not restricted to the foregoing description, under the situation that does not break away from the spirit and scope of the present invention, can carry out various variants and modifications embodiments of the invention.
Claims (4)
1. hot rolled H-shaped method of manufacture with anti-lamellar tearing performance; It is characterized in that said method comprising the steps of: adopt converter or electric arc furnace that molten iron, steel scrap or molten iron and steel scrap are tapped after melting; Wherein, In tapping process, in molten steel, add Si and the Si in the molten steel be adjusted to accounting for 0.10%～0.15% of molten steel gross weight, to carry out the calm deoxidation of silicon; Then, in molten steel, add at least a among Ti and the Zr of predetermined amount, then carry out ladle refining and add Si, make strand through continuous casting subsequently according to the needs of steel grades; Then, steel billet is heated to 1150 ℃～1300 ℃ and be incubated for some time; Utilize universal mill that strand is rolled into H shaped steel, last air cooling, thus obtain said hot rolled H-shaped.
2. method of manufacture according to claim 1 is characterized in that only using the calm deoxidation of Si, to keep the melting chemical composition Als＜0.010wt% of steel.
3. method of manufacture according to claim 1 is characterized in that using the Ti that adds after the calm deoxidation of Si and at least a content among the Zr to account for 0.0001%～0.030% of molten steel gross weight.
4. one kind has the hot rolled H-shaped of anti-lamellar tearing performance according to the described method of manufacture manufacturing of each claim in the claim 1 to 3; It is characterized in that said hot rolled H-shaped chemical ingredients is by weight percentage: 0.06%～0.20% C, 0.10%～0.50% Si, 0.4%～1.6% Mn, be less than and equal 0.025% P, be less than and equal 0.010% S, be less than and equal 0.06% Nb, be less than and equal 0.15% V, 0.0001%～0.030% Ti and/or Zr, be less than 0.010% Als, surplus is Fe and unavoidable impurities.
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| CN103484765A (en) * | 2013-09-12 | 2014-01-01 | 莱芜钢铁集团有限公司 | Thick low-temperature-resistant H-shaped steel for support of railway overhead contact system and preparing method thereof |
| CN103667910A (en) * | 2013-12-13 | 2014-03-26 | 莱芜钢铁集团有限公司 | Hot-rolled H-shaped steel with excellent low-temperature impact toughness and manufacturing method thereof |
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| CN103966508A (en) * | 2014-05-20 | 2014-08-06 | 莱芜钢铁集团有限公司 | Steel for low-temperature-resistant forklift portal and manufacturing method thereof |
| CN103966508B (en) * | 2014-05-20 | 2016-09-21 | 莱芜钢铁集团有限公司 | Low temperature resistant forklift door frame steel and manufacture method thereof |
| CN104004957A (en) * | 2014-06-12 | 2014-08-27 | 莱芜钢铁集团有限公司 | Method for producing H-type steel with small compression ratio and for low temperature through oxide metallurgy technology |
| CN104630625A (en) * | 2015-01-28 | 2015-05-20 | 山东钢铁股份有限公司 | Low-temperature-resistant hot-rolled H-shaped steel and preparation method thereof |
| CN104630625B (en) * | 2015-01-28 | 2017-05-17 | 山东钢铁股份有限公司 | Low-temperature-resistant hot-rolled H-shaped steel and preparation method thereof |
| CN106319137A (en) * | 2015-06-26 | 2017-01-11 | 鞍钢股份有限公司 | Control method for total aluminum content of high-titanium steel |
| CN107299283A (en) * | 2017-05-27 | 2017-10-27 | 内蒙古包钢钢联股份有限公司 | Depth low temperature resistant hot rolled H-shaped and its production technology |
| CN109234630A (en) * | 2018-10-26 | 2019-01-18 | 首钢长治钢铁有限公司 | A kind of low-alloy high-tensile structural steel is hot rolled H-shaped and its production method |
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