CN101985719A - Composite additive for smelting high heat input welding low-alloy steel and using method thereof - Google Patents
Composite additive for smelting high heat input welding low-alloy steel and using method thereof Download PDFInfo
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- CN101985719A CN101985719A CN 201010528646 CN201010528646A CN101985719A CN 101985719 A CN101985719 A CN 101985719A CN 201010528646 CN201010528646 CN 201010528646 CN 201010528646 A CN201010528646 A CN 201010528646A CN 101985719 A CN101985719 A CN 101985719A
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Abstract
The invention relates to a composite additive for smelting high heat input welding low-alloy steel and a using method thereof. The composite additive comprises the following chemical ingredients in percentage by weight: 40 to 75 percent of Si, 5 to 15 percent of Ca, 10 to 25 percent of Ti, 5 to 25 percent of Zr, and the balance of Fe and inevitable impurities. A method for preparing the additive comprises the following steps: respectively adding Ti and Zr based on Si-Ca alloy according to the weight percentage of the chemical ingredients; and smelting and casting the mixture in a vacuum induction furnace, thus obtaining the additive. The method for using the prepared composite additive comprises the following steps: maintaining the free oxygen content in molten steel to be between 10 and 200ppm before the composite additive is added; using the composite additive for carrying out deoxygenation and composite alloying on the molten steel, wherein the dosage of the composite additive is 0.5 to 5kg per ton of steel; and carrying out continuous casting and hot rolling according to the conventional process. The invention has the characteristics that the cost is low, the chemical ingredients and the process are simple, and the prepared composite additive has high ingredient hit rate.
Description
Technical field
The invention belongs to the technical field of smelting of low alloy steel.Relate in particular to a kind of composite additive and using method of smelting the large-linear energy welding low-alloy steel.
Background technology
In the last thirty years, in order to improve the welding efficiency of heavy construction structure, guarantee the safe reliability of its use, large-line energy welding technique such as the single face union-melt weld that welding efficiency is high, electro-gas welding, electroslag welding are used in succession, this has come problem newly for traditional low alloy high strength steel strip, promptly weld the intensity and the toughness variation of coarse-grain heat affected zone (HAZ), and easily produce defectives such as welding cold cracking.Therefore, the HAZ flexible improves the focus and emphasis that becomes Hi-Stren steel large-line energy welding research and development.
(tensile strength is 600～1000MPa) structural transformation behavior and controls forming process and the control method thereof that must fully take all factors into consideration mother metal and welded heat affecting zone tissue thereof Hi-Stren steel under the large-line energy welding conditions.Because the embrittlement of the welded heat affecting zone that softens and cause therefrom of the alligatoring of the welded heat affecting zone tissue under the big welding heat initial conditions, heat affected zone and the reduction of strength of joint are the subject matter in the Hi-Stren steel welding.
A large amount of research and discoveries has been carried out, high-strength steel and manufacture method thereof under the large-line energy welding conditions that research and design make new advances in aspects such as domestic and international welded heat affecting zone structure property feature to Hi-Stren steel, austenite crystal growth dynamics.As steel series with high linear energy and low weld crack sensitivity and production method thereof " (ZL 02115877.0); " high-performance refractory weather-resisting building steel and production method thereof " (ZL 01133562.9); " unmodified high-toughness low-temp steel for high-energy line welding and production method thereof " (ZL 01128316.5); large-line energy welding high tenacity molten zinc corrosion resistant steel and production method (ZL 01128476.5) thereof; " but Plate Steel and manufacture method of the welding of a kind of large-line energy " (CN 200510023216.0); " steel in use for soldering pressure pipe in hydraulic power station under large line energy and production method thereof " (CN 200510019165.4), " but the superstrength Plate Steel and the manufacture method thereof of large-line energy welding " (ZL 200410017255.5), as " steel series with high linear energy and low weld crack sensitivity and production method thereof " patented technology such as (ZL02115877.0), but there are the following problems:
1) weld heat input is low, is generally 50～150kJ/cm; 2) content of oxygen is not made clear and definite regulation, be difficult to improve the quality of products and weld heat input; 3) Si content is higher, because of the Si of high level can promote the formation of M/A, reduces the toughness of HAZ; 4) contain the expensive metal vanadium, the cost of product is improved; 5) the employing hardening and tempering process production that has, thereby the production process complexity, link is many, production cost is high, owing to adopt hardening and tempering process production, carbon content is unfavorable for anti-bigger heat input welding and realizes controlled rolling and controlled chilling and mechanical thermal treatment process (TMCP) in general than non-tempering process height; 6) contain rare earth element in the steel, rare earth element is very active element, is not easy control, and pollutes molten steel easily, is unfavorable for the raising of quality product; 7) target component Si, Ti and Zr in the steel are grown, are not easy to hit to above smelting process complex technical process, time.
Summary of the invention
The present invention is intended to overcome the prior art defective, and purpose provides composite additive and the using method that a kind of with low cost, chemical ingredients and technological process are simply smelted the large-linear energy welding low-alloy steel, and prepared composite additive composition shoots straight.
For achieving the above object, the technical solution used in the present invention is: the chemical ingredients and the content thereof of this composite additive are: Si is 40～75wt%, and Ca is 5～15wt%, and Ti is 10～25wt%, and Zr is 5～25wt%, and all the other are Fe and unavoidable impurities; The preparation method of this composite additive is: by above-mentioned chemical ingredients and content thereof, based on the Si-Ca alloy, add Ti, Zr respectively, form through vacuum induction melting and casting.
Wherein: Ti is to be the Ti alloy that raw material forms through refinement with Ti magnetite blast furnace slag; Zr is sponge grease Zr or for the Si-Zr alloy or for metallic Z r.
The using method of smelting the composite additive of large-linear energy welding low-alloy steel is: adopt converter or electric arc furnace that molten iron or steel scrap or molten iron are carried out refining and adjustment molten steel composition with steel scrap after steel-making, keeping the free oxygen level in the molten steel before adding composite additive is 10～200ppm, carry out deoxidation and composite alloying with composite additive, composite additive adds molten steel with the form of bulk alloy or cored-wire, the add-on of composite additive is steel 0.5～5kg per ton, and technology is carried out continuous casting and hot rolling routinely then.
Because adopt technique scheme, the present invention is a main ingredient with Si, Ca, Ti and Zr, form through vacuum induction melting and casting, so with low cost, chemical ingredients and technological process are simple.The prepared composite additive of the present invention helps forming the oxide compound of acicular ferrite nucleating, and a plurality of elements according to target composition are made composite additive, the disposable purpose that reaches deoxidation and alloying.Have that technological process is simple, the time is short, be easy to hit the characteristics of the target component of Si, Ti, Zr.The composite additive of the present invention's preparation is used for deoxidation and composite alloying, the tensile strength of the large-linear energy welding low-alloy steel of being smelted is 600～1000MPa, under the heat input of 150～400kJ/cm, weld, can not heat-treat after the welding, the ballistic work of welded H AZ is not less than 2/3 of mother metal ballistic work.
Therefore, with the large-linear energy welding low-alloy high-strength steel that the composite additive of the present invention preparation is used to smelt, the welding quality height of rolled sheet material, crack sensitivity is low, tensile strength is high.Can effectively reduce welding procedure intensity, improve welding quality, reduce manufacturing cost, economize on resources and the energy.Thereby the various large-line energies welding of weldering, electro-gas welding, electroslag welding are protected in suitable union-melt weld, gas.
Embodiment
Below in conjunction with embodiment the present invention being further described, is not the restriction to its protection domain.
For avoiding repetition, earlier Ti and the Zr that is added in the embodiment is described below respectively, repeat no more among the embodiment: Ti is to be the Ti alloy that raw material forms through refinement with Ti magnetite blast furnace slag; Zr is sponge grease Zr or for the Si-Zr alloy or for metallic Z r.
Embodiment 1
A kind of composite additive and using method of smelting the large-linear energy welding low-alloy steel.The chemical ingredients and the content thereof of this composite additive are: Si is 40～55wt%, and Ca is 10～15wt%, and Ti is 15～25wt%, and Zr is 15～25wt%, and all the other are Fe and unavoidable impurities.
The preparation method of this composite additive is: by said components, based on the Si-Ca alloy, add Ti and Zr respectively, form through vacuum induction melting and casting.
The using method of the composite additive of present embodiment preparation is: adopt converter that molten iron is carried out refining and adjusts molten steel composition after steel-making, keeping the free oxygen level in the molten steel before adding reductor is 10～80ppm, carry out deoxidation and composite alloying with reductor, reductor adds molten steel with the form of bulk alloy, the add-on of reductor is steel 0.5～1.5kg per ton, and technology is carried out continuous casting and hot rolling routinely then.
The chemical ingredients and the content thereof of the continuous-cast blank of present embodiment are: C is 0.03～0.07wt%, Si is 0.1～0.3wt%, Mn is 1.5～2.5wt%, Ni is 0.2～0.6wt%, Cu is 0.6～1.0wt%, Als is 0.02～0.06wt%, and Nb is 0.03～0.07wt%, and Ti is 0.01～0.05wt%, Ca is 0.001～0.003wt%, Mg is 0.001～0.003wt%, and Ba is 0.001～0.003wt%, and N is 0.006～0.010wt%, B is 0.001～0.002wt%, P＜0.008wt%, S＜0.007wt%, all the other are Fe and unavoidable impurities.The thickness of strand is 210～250mm.
Hot rolling technology is: strand is heated to 1150～1250 ℃, and hot rolling was carried out in soaking in 2～3 hours, and rolling is the thick steel plate of 40～60mm; Roll back control relaxation 10～15s, carry out online cooling with the speed of cooling of 5～15 ℃/s then.
The tensile strength of institute's rolled sheet material is 600～750MPa, can weld under the heat input of 150～200kJ/cm, need not heat-treat after the welding, and the ballistic work of welded H AZ is not less than 2/3 of mother metal ballistic work.
Embodiment 2
A kind of composite additive and using method of smelting the large-linear energy welding low-alloy steel.The chemical ingredients and the content thereof of this composite additive are: Si is 50～65wt%, and Ca is 8～13wt%, and Ti is 12～22wt%, and Zr is 10～22wt%, and all the other are Fe and unavoidable impurities.
The preparation method of this composite additive is: press mentioned component, based on the Si-Ca alloy, add Ti, Zr respectively, form through vacuum induction melting and casting.
The using method of the composite additive of present embodiment preparation is: adopt electric arc furnace that steel scrap is carried out refining and adjusts molten steel composition after steel-making, keeping the free oxygen level in the molten steel before adding reductor is 120～200ppm, carry out deoxidation and composite alloying with reductor, reductor adds molten steel with the form of bulk alloy or cored-wire, the add-on of reductor is steel 3～5kg per ton, and technology is carried out continuous casting and hot rolling routinely then.
The continuous-cast blank chemical ingredients and the content thereof of present embodiment are: C is 0.04～0.08wt%, Si is 0.2～0.5wt%, Mn is 2～3wt%, Ni is 0.3～0.7wt%, Cu is 0.8～1.2wt%, Als is 0.03～0.06wt%, and Nb is 0.02～0.06wt%, and Ti is 0.01～0.05wt%, Ca is 0.001～0.003wt%, Mg is 0.001～0.003wt%, and Ba is 0.001～0.003wt%, and N is 0.004～0.008wt%, B is 0.001～0.003wt%, P＜0.01wt%, S＜0.007wt%, all the other are Fe and unavoidable impurities.The thickness of strand is 210～250mm.
Hot rolling technology is: earlier strand is heated to 1200～1300 ℃, hot rolling is carried out in soaking 1.5～2.5 hours again, and rolling is the thick steel plate of 30～50mm; Roll back control relaxation 12～20s, get final product with the online cooling of the speed of cooling of 10～15 ℃/s then.
The tensile strength of institute's rolled sheet material is 700～850MPa, can weld under the heat input of 250～400kJ/cm, need not heat-treat after the welding, and the ballistic work of welded H AZ is not less than 2/3 of mother metal ballistic work.
Embodiment 3
A kind of composite additive and using method of smelting the large-linear energy welding low-alloy steel.The chemical ingredients and the content thereof of this composite additive are: Si is 60～75wt%, and Ca is 5～10wt%, and Ti is 10～20wt%, and Zr is 5～15wt%, and all the other are Fe and unavoidable impurities.The preparation method of this composite additive is: by said components, based on the Si-Ca alloy, add Ti and Zr, form through vacuum induction melting and casting.
The using method of the composite additive of present embodiment preparation is: adopt converter or electric arc furnace that molten iron and steel scrap are carried out refining and adjust molten steel composition after steel-making, keeping the free oxygen level in the molten steel before adding reductor is 60～120ppm, carry out deoxidation and composite alloying with reductor, reductor adds molten steel with the form of bulk alloy or cored-wire, the add-on of reductor is steel 1～3kg per ton, and technology is carried out continuous casting and hot rolling routinely then.
The continuous-cast blank chemical ingredients and the content thereof of present embodiment are: C is 0.02～0.06wt%, Si is 0.1～0.3wt%, Mn is 1.8～3.0wt%, Ni is 0.4～0.8wt%, Cu is 1.1～1.5wt%, Als is 0.01～0.05wt%, and Nb is 0.02～0.06wt%, and Ti is 0.01～0.05wt%, Ca is 0.001～0.003wt%, Mg is 0.001～0.003wt%, and Ba is 0.001～0.003wt%, and N is 0.006～0.010wt%, B is 0.0016～0.0020wt%, P＜0.009wt%, S＜0.010wt%, all the other are Fe and unavoidable impurities.The thickness of strand is 210～250mm.
Hot rolling technology is: strand is heated to 1200～1300 ℃, and hot rolling is carried out in soaking 1.5～2.5 hours, and rolling is the thick steel plate of 60～80mm, carries out online cooling with the speed of cooling of 15～25 ℃/s then and gets final product.
The tensile strength of institute's rolled sheet material is 850～1000MPa, can weld under the heat input of 200～300kJ/cm, need not heat-treat after the welding, and the ballistic work of welded H AZ is not less than 2/3 of mother metal ballistic work.
This embodiment is a main ingredient with Si, Ca, Ti and Zr, forms through vacuum induction melting and casting, so with low cost, chemical ingredients and technological process are simple.Prepared composite additive helps forming the oxide compound of acicular ferrite nucleating, and a plurality of elements according to target composition are made composite additive, the disposable purpose that reaches deoxidation and alloying.Have that technological process is simple, the time is short, be easy to hit the characteristics of the target component of Si, Ti, Zr.With this composite additive deoxidation and composite alloying, the tensile strength of the large-linear energy welding low-alloy steel of being smelted is 600～1000MPa, weld under the heat input of 150～400kJ/cm, can not heat-treat after the welding, the ballistic work of welded H AZ is not less than 2/3 of mother metal ballistic work.
Therefore, that this embodiment has is with low cost, chemical ingredients and characteristic of simple process, and prepared composite additive composition shoots straight.The welding quality height of rolled sheet material, crack sensitivity is low, tensile strength is high.Thereby the various large-line energies welding of weldering, electro-gas welding, electroslag welding are protected in suitable union-melt weld, gas.
Claims (4)
1. composite additive of smelting the large-linear energy welding low-alloy steel, the chemical ingredients and the content thereof that it is characterized in that this additive are: Si is 40～75wt%, and Ca is 5～15wt%, and Ti is 10～25wt%, Zr is 5～25wt%, and all the other are Fe and unavoidable impurities;
The preparation method of this additive is: by above-mentioned chemical ingredients and content thereof, based on the Si-Ca alloy, add Ti and Zr respectively, form through vacuum induction melting and casting.
2. the composite additive of smelting large-linear energy welding low-alloy steel according to claim 1 is characterized in that described Ti is is the Ti alloy that raw material forms through refinement with Ti magnetite blast furnace slag.
3. the composite additive of smelting large-linear energy welding low-alloy steel according to claim 1 is characterized in that described Zr is sponge grease Zr or for the Si-Zr alloy or for metallic Z r.
4. as the using method of the composite additive of the described smelting large-linear energy welding low-alloy of claim 1～3 steel, it is characterized in that adopting converter or electric arc furnace with molten iron, or steel scrap, or molten iron and steel scrap carry out refining and adjust molten steel composition after steel-making, keeping the free oxygen level in the molten steel before adding composite additive is 10～200ppm, carry out deoxidation and composite alloying with composite additive, composite additive adds molten steel with the form of bulk alloy or cored-wire, the add-on of composite additive is steel 0.5～5kg per ton, and technology is carried out continuous casting and hot rolling routinely then.
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Cited By (4)
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| WO2013143022A1 (en) * | 2012-03-26 | 2013-10-03 | 宝山钢铁股份有限公司 | Unoriented silicon steel and method for manufacturing same |
| CN103757178A (en) * | 2014-01-08 | 2014-04-30 | 南京钢铁股份有限公司 | Additive for improving anti-large line energy welding performance, and manufacturing and application methods thereof |
| CN106521317A (en) * | 2016-11-18 | 2017-03-22 | 东北大学 | Manufacturing method for low-carbon thin strip steel containing acicular ferrite |
| CN107841598A (en) * | 2017-11-01 | 2018-03-27 | 马鞍山瑞辉实业有限公司 | A kind of cast steel deoxygenated alloy and its processing method and its application method |
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| CN1831154A (en) * | 2005-10-26 | 2006-09-13 | 姜殿波 | Si-Ca-Ti-Fe alloy used for steelmaking desoxidant |
| CN101050505A (en) * | 2007-05-10 | 2007-10-10 | 武汉科技大学 | Soldering steel plate in high intensity in use for ocean by large line energy, and manufacturing method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013143022A1 (en) * | 2012-03-26 | 2013-10-03 | 宝山钢铁股份有限公司 | Unoriented silicon steel and method for manufacturing same |
| US10385414B2 (en) | 2012-03-26 | 2019-08-20 | Baoshan Iron & Steel Co., Ltd. | Non-oriented silicon steel and its manufacturing method |
| CN103757178A (en) * | 2014-01-08 | 2014-04-30 | 南京钢铁股份有限公司 | Additive for improving anti-large line energy welding performance, and manufacturing and application methods thereof |
| CN106521317A (en) * | 2016-11-18 | 2017-03-22 | 东北大学 | Manufacturing method for low-carbon thin strip steel containing acicular ferrite |
| CN106521317B (en) * | 2016-11-18 | 2018-06-26 | 东北大学 | A kind of manufacturing method containing acicular ferrite low-carbon Thin Strip Steel |
| CN107841598A (en) * | 2017-11-01 | 2018-03-27 | 马鞍山瑞辉实业有限公司 | A kind of cast steel deoxygenated alloy and its processing method and its application method |
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Application publication date: 20110316 |