CN103993207A - Formula and making method of 5xxx series aluminum alloy extruded section bar for high speed ships - Google Patents
Formula and making method of 5xxx series aluminum alloy extruded section bar for high speed ships Download PDFInfo
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- CN103993207A CN103993207A CN201410165491.5A CN201410165491A CN103993207A CN 103993207 A CN103993207 A CN 103993207A CN 201410165491 A CN201410165491 A CN 201410165491A CN 103993207 A CN103993207 A CN 103993207A
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Abstract
The invention belongs to the metal material field, and especially relates to a formula of a 5xxx series aluminum alloy extruded section bar for high speed ships. The formula comprises 0.18-0.22wt% of Si, 4.5-5.5wt% of Mg, 0.15-0.25wt% of Fe, 0.5-1.0wt% of Mn, 0.05-0.25wt% of Cr, 0.2-0.25wt% of Zn, 0.1-0.15wt% of Ti, 0.05wt% or below of other isolated impurities, 0.15wt% or below of other impurities, and the balance Al. A making method of the 5xxx series aluminum alloy extruded section bar for high speed ships comprises the steps of fusion casting, homogenization, cast ingot heating, extruding and heat treatment. The aluminum section bar produced through the method according to the formula has the advantages of uniform and stable microstructure and performances, fast extrusion speed, no spalling corrosion phenomenon and strong stress corrosivity, and enables anode current dead load life to be longer than 5h.
Description
[technical field]
The invention belongs to metal material field, relate in particular to high-speed ship 5xxx series alloys extruded section formula and manufacturing process
[background technology]
The Working environment of boats and ships requires its structured material to have the over-all propertieies such as high specific tenacity, toughness, solidity to corrosion, antifatigue, shock resistance and good weldability, and the boats and ships that especially travel in ocean environment, because seawater contains a large amount of Cl
-, be a kind of typical electrolytic solution, there is very strong corrodibility, under this strong corrosive environment and stress, more require marine material to there is excellent electrochemically resistant and learn corrosion and anti-stress corrosion performance.In traditional material, although iron and steel and polymer-based composite have a large amount of application in shipbuilding, but aluminum alloy materials has a series of over-all propertieies that iron and steel and macromolecular material do not possess, high specific strength and solidity to corrosion, good formability and weldability, easily reclaim and the feature such as anti-aging makes the application of aluminium alloy in shipbuilding more and more, and have a high potential, have a extensive future.At present 5xxx line aluminium alloy, has higher intensity, good plasticity, corrosion stability and weldability, has shown its critical role making in the deck of boat, barnacle, hull understructure, is the important materials of setting up hull structure.
But for sheet material, 5xxx is that alloy extrudate processing but has suitable technical difficulty, conventional cast 5xxx line aluminium alloy casting rod adopts the methods such as semicontinuous casting, and production efficiency is low, and the founding defects such as component segregation and hot tearing are of common occurrence; Extrusion speed is slow, and not at that time, the periodically defect such as crackle and coarse grain ring very easily appears to the control of temperature velocity condition in product.These problems are that advanced 5xxx aluminium alloy extrusions manufacture field is expected solution or perfect always.So far, the domestic high-performance 5xxx line aluminium alloy section bar even demand of plate product depends on external import to a certain extent, and shipbuilding cost is high, has seriously restricted the development of China's shipbuilding, also totally unfavorable to the advanced aluminium industrial development of China.
[summary of the invention]
The present invention is intended to address the above problem, and a kind of tissue, performance is uniform and stable, corrosion resistance nature is strong high-speed ship 5xxx series alloys extruded section formula and manufacturing process are provided.
For achieving the above object, the technical solution used in the present invention is high-speed ship 5xxx series alloys extruded section formula, and its formula is formulated by weight percentage by following elementary composition, the Si of 0.18-0.22%, the Mg of 4.5-5.5%, the Fe of 0.15-0.25%, the Mn of 0.5-1.0%, the Cr of 0.05-0.25%, the Zn of 0.2-0.25%, the Ti of 0.1-0.15%, all the other single foreign matter content≤0.05%, all the other impurity add up to≤0.15%, and surplus is Al, and the weight percent summation of each component is 100%.
Further, provide a kind of high-speed ship 5xxx series alloys extruded section formula, the Si that each elementary composition and weight percent are 0.2%, the Mg of 4.5-4.8%, 0.2% Fe, the Mn of 0.6-0.9%, the Cr of 0.05-0.2%, 0.25% Zn, the Ti of 0.1-0.15%, all the other single foreign matter content≤0.03%, all the other impurity add up to≤0.15%, surplus is Al, and the weight percent summation of each component is 100%.
Further, provide a kind of high-speed ship 5xxx series alloys extruded section formula, the Si that each elementary composition and weight percent are 0.2%, the Mg of 5.1-5.4%, 0.2% Fe, the Mn of 0.7-1.0%, the Cr of 0.05-0.25%, 0.25% Zn, the Ti of 0.1-0.15%, all the other single foreign matter content≤0.03%, all the other impurity add up to≤0.15%, surplus is Al, and the weight percent summation of each component is 100%.
Further, the manufacturing process of a kind of high-speed ship 5xxx series alloys extruded section is provided, comprise founding, homogenize, ingot casting heating, extruding and heat treatment step, it is characterized in that: described founding step adopts hot direct casting fabrication technique, by Ar gas-flux mixing refining, with 55%NaCl+45%KCl, as insulating covering agent, smelting temperature is 700-730 DEG C, teeming temperature is 680-710 DEG C, and when founding, the order of addition(of ingredients) of alloy is: Al, Al-Mn, Al-Cr, Mg.
Further, homogenization step carries out homogenizing processing to ingot casting under 490 DEG C of environment, and soaking time is 8h.
Further, compression step is pushed on 3600T tonnage extrusion machine, container diameter is 275mm, extrusion ratio is 35, ingot blank Heating temperature 460-500 DEG C, and extrusion speed is 4-8m/min, container Heating temperature is 440-460 DEG C, mold heated temperature is 460-480 DEG C, and extrusion temperature is 490 DEG C, and section bar temperature out is controlled in 500 DEG C.
Contribution of the present invention is, a kind of high-speed ship 5xxx series alloys extruded section formula and manufacturing process thereof are provided, according to the aluminium section bar tissue of this formula and explained hereafter, performance is uniform and stable, extrusion speed is fast, main technical details can reach: lumber recovery > 98%, extrusion speed > 5 m/min, extruded section lumber recovery > 85%, tensile strength >=350 MPa, yield strength >=210 MPa, the standard of unit elongation >=15%, Peeling Corrosion is better than ASTM-G66 standard, without Peeling Corrosion phenomenon, stress corrosion performance reaches or is better than GJB 1742-93 Appendix B standard, and the anodic current dead load life-span is greater than 5 hours.Effectively overcome conventional cast 5xxx line aluminium alloy production efficiency low, the founding defects such as component segregation and hot tearing; Simultaneously also effectively overcome extrusion speed slow, the control of temperature velocity condition not at that time, the defect such as periodicity crackle and coarse grain ring that product occurs.
[embodiment]
The following example is to further explanation of the present invention and supplements, the present invention is not constituted any limitation.
Embodiment 1
The present embodiment adopts 0.2% Si, 5.0% Mg, 0.2% Fe, 0.7% Mn, 0.15% Cr, 0.25% Zn, 1.0% Ti, all the other single foreign matter content≤0.05%, all the other impurity add up to≤0.15%, surplus is Al, and the formula that the weight percent summation of each component is 100% carries out the manufacture of high-speed ship 5xxx series alloys extruded section.Adopt hot top casting machine to carry out founding, use Ar gas-flux mixing refining, with 55%NaCl+45%KCl as insulating covering agent, smelting temperature is 700-730 DEG C, teeming temperature is 680-710 DEG C, when founding, the order of addition(of ingredients) of alloy is: Al, Al-Mn, Al-Cr, Mg, A1-Ti-B fining agent adds online, the last degasification of melting, skims.In the time that temperature is 700～730 DEG C, the billet of casting (95-265mm), make the requirement that all touches the mark of the aluminium alloy cast rod outward appearance of manufacture place and internal soundness by hot direct casting, small dimension (95-120mm) casting rod is cast 30-36 at every turn and is propped up, medium above specification (165-265mm) casting rod is cast 16-26 at every turn and is propped up, more than casting speed reaches 80mm/min, casting rod lumber recovery reaches more than 98%, production efficiency is several times as much as the at present domestic semi-continuous casting method generally adopting, effect is remarkable, and casting rod surface quality is good, neat light, almost segregation-free defect, need not railway carriage processing before extruding.Homogenizing annealing carries out in homogeneous furnace, and ingot casting is carried out to 490 DEG C of homogenizing experiments, and soaking time is 8h, water-cooled after coming out of the stove.On 3600T tonnage extrusion machine, carry out squeeze test, container diameter is 275mm, extrusion ratio is 35, 480 DEG C of ingot blank Heating temperatures, extrusion speed is 5m/min, and scene regulates according to actual needs, container Heating temperature is 450 DEG C, mold heated temperature is 470 DEG C, extrusion temperature is 490 DEG C, section bar temperature out is controlled in 500 DEG C, adopt air blast quenching, air cooling again, the alloy matrix aluminum crystal grain squeezing out by the method presents heat deformable state, the abundant solid solution of second-phase, the fragmentation of solid solution second-phase is not arranged along the direction of extrusion on a small quantity, be uniformly distributed, it is of a size of 0.5mm left and right, functional.
Embodiment 2
The present embodiment adopts 0.2% Si, 5.3% Mg, 0.2% Fe, 0.8% Mn, 0.22% Cr, 0.25% Zn, 1.5% Ti, all the other single foreign matter content≤0.05%, all the other impurity add up to≤0.15%, surplus is Al, and the formula that the weight percent summation of each component is 100% carries out the manufacture of high-speed ship 5xxx series alloys extruded section.Adopt hot top casting machine to carry out founding, use Ar gas-flux mixing refining, with 55%NaCl+45%KCl as insulating covering agent, smelting temperature is 700-730 DEG C, teeming temperature is 680-710 DEG C, when founding, the order of addition(of ingredients) of alloy is: Al, Al-Mn, Al-Cr, Mg, A1-Ti-B fining agent adds online, the last degasification of melting, skims.In the time that temperature is 700～730 DEG C, the billet of casting (95-265mm), make the requirement that all touches the mark of the aluminium alloy cast rod outward appearance of manufacture place and internal soundness by hot direct casting, small dimension (95-120mm) casting rod is cast 30-36 at every turn and is propped up, medium above specification (165-265mm) casting rod is cast 16-26 at every turn and is propped up, more than casting speed reaches 80mm/min, casting rod lumber recovery reaches more than 98%, production efficiency is several times as much as the at present domestic semi-continuous casting method generally adopting, effect is remarkable, and casting rod surface quality is good, neat light, almost segregation-free defect, need not railway carriage processing before extruding.Homogenizing annealing experiment is carried out in homogeneous furnace, and sample is carried out to 490 DEG C of homogenizing experiments, and soaking time is 8h, water-cooled after coming out of the stove.On 3600T tonnage extrusion machine, carry out squeeze test, container diameter is 275mm, and extrusion ratio is 35,480 DEG C of ingot blank Heating temperatures, extrusion speed is 5m/min, and scene regulates according to actual needs, container Heating temperature is 450 DEG C, and mold heated temperature is 470 DEG C, extrusion temperature is 490 DEG C, section bar temperature out is controlled in 500 DEG C, adopts air blast quenching, then air cooling.The aluminium alloy that the present embodiment is produced carries out the experiment of Peeling Corrosion behavior, and experimental result is as shown in the table:
| Predeformation amount/% | Tensile strength/MPa | Unit elongation/% | Peeling Corrosion grade |
| 0 | 335 | 21.2 | EA |
| 5 | 344 | 20.5 | N |
| 10 | 365 | 19.1 | N |
| 15 | 374 | 12.6 | PB |
| 20 | 382 | 10.2 | EA |
By learning in table, when aluminum alloy specimen predeformation amount is 10%, antistripping corrosive nature is best, does not occur spot corrosion and Peeling Corrosion phenomenon, and under this predeformation amount condition, the tensile strength of alloy is 365MPa, and unit elongation is 19.1%, conformance with standard.
Although the present invention is disclosed by above embodiment, protection scope of the present invention is not limited to this, is not departing under the condition of the present invention's design, and distortion, the replacement etc. that above each member is done all will fall within the scope of claim of the present invention.
Claims (6)
1. a 5xxx series alloys extruded section formula for high-speed ship, is characterized in that: fills a prescription formulated by weight percentage by following elementary composition, and the Si of 0.18-0.22%, the Mg of 4.5-5.5%, the Fe of 0.15-0.25%, the Mn of 0.5-1.0%, the Cr of 0.05-0.25%, the Zn of 0.2-0.25%, the Ti of 0.1-0.15%, all the other single foreign matter content≤0.05%, all the other impurity add up to≤0.15%, surplus is Al, and the weight percent summation of each component is 100%.
2. 5xxx series alloys extruded section formula for a kind of high-speed ship as claimed in claim 1, it is characterized in that: the Si that each elementary composition and weight percent are 0.2%, the Mg of 4.5-4.8%, 0.2% Fe, the Mn of 0.6-0.9%, the Cr of 0.05-0.2%, 0.25% Zn, the Ti of 0.1-0.15%, all the other single foreign matter content≤0.03%, all the other impurity add up to≤0.15%, and surplus is Al, and the weight percent summation of each component is 100%.
3. 5xxx series alloys extruded section formula for a kind of high-speed ship as claimed in claim 1, it is characterized in that: the Si that each elementary composition and weight percent are 0.2%, the Mg of 5.1-5.4%, 0.2% Fe, the Mn of 0.7-1.0%, the Cr of 0.05-0.25%, 0.25% Zn, the Ti of 0.1-0.15%, all the other single foreign matter content≤0.03%, all the other impurity add up to≤0.15%, and surplus is Al, and the weight percent summation of each component is 100%.
4. the manufacturing process of a high-speed ship use 5xxx series alloys extruded section, comprise founding, homogenize, ingot casting heating, extruding and heat treatment step, it is characterized in that: described founding step adopts hot direct casting fabrication technique, by Ar gas-flux mixing refining, with 55%NaCl+45%KCl as insulating covering agent, smelting temperature is 700-730 DEG C, and teeming temperature is 680-710 DEG C, and when founding, the order of addition(of ingredients) of alloy is: Al, Al-Mn, Al-Cr, Mg.
5. the manufacturing process of 5xxx series alloys extruded section for high-speed ship as claimed in claim 4, is characterized in that: described homogenization step carries out homogenizing processing to ingot casting under 490 DEG C of environment, and soaking time is 8h.
6. the manufacturing process of 5xxx series alloys extruded section for high-speed ship as claimed in claim 5, it is characterized in that: described compression step is pushed on 3600T tonnage extrusion machine, container diameter is 275mm, extrusion ratio is 35, ingot blank Heating temperature 460-500 DEG C, and extrusion speed is 4-8m/min, container Heating temperature is 440-460 DEG C, mold heated temperature is 460-480 DEG C, and extrusion temperature is 490 DEG C, and section bar temperature out is controlled in 500 DEG C.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104400362A (en) * | 2014-12-12 | 2015-03-11 | 西南铝业（集团）有限责任公司 | Improved machining method of I-shaped beam profile |
| CN104400361A (en) * | 2014-12-12 | 2015-03-11 | 西南铝业（集团）有限责任公司 | I-shaped beam profile machining process |
| CN104400360A (en) * | 2014-12-12 | 2015-03-11 | 西南铝业（集团）有限责任公司 | Optimized I beam profile processing method |
| CN104476138A (en) * | 2014-12-12 | 2015-04-01 | 西南铝业（集团）有限责任公司 | I-shaped beam profile processing method |
| CN104526279A (en) * | 2014-12-12 | 2015-04-22 | 西南铝业（集团）有限责任公司 | I-shaped beam profile machining method |
| CN105441741A (en) * | 2015-11-13 | 2016-03-30 | 西南交通大学 | Aluminum alloy welding material with high compactness and preparation method thereof |
| CN106834829A (en) * | 2017-02-27 | 2017-06-13 | 东莞市铝美铝型材有限公司 | A kind of ship anticorodal and preparation method thereof |
| CN106917015A (en) * | 2017-02-27 | 2017-07-04 | 东莞市铝美铝型材有限公司 | A kind of tough aluminium alloy high used for vehicle and preparation method thereof |
| CN115323226A (en) * | 2022-10-14 | 2022-11-11 | 山东裕航特种合金装备有限公司 | Fastener for ship and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104400362A (en) * | 2014-12-12 | 2015-03-11 | 西南铝业（集团）有限责任公司 | Improved machining method of I-shaped beam profile |
| CN104400361A (en) * | 2014-12-12 | 2015-03-11 | 西南铝业（集团）有限责任公司 | I-shaped beam profile machining process |
| CN104400360A (en) * | 2014-12-12 | 2015-03-11 | 西南铝业（集团）有限责任公司 | Optimized I beam profile processing method |
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| CN106917015B (en) * | 2017-02-27 | 2018-10-16 | 东莞市铝美铝型材有限公司 | One kind tough aluminium alloy of height used for vehicle and preparation method thereof |
| CN106834829B (en) * | 2017-02-27 | 2018-10-16 | 东莞市铝美铝型材有限公司 | A kind of ship anticorodal and preparation method thereof |
| CN115323226A (en) * | 2022-10-14 | 2022-11-11 | 山东裕航特种合金装备有限公司 | Fastener for ship and preparation method thereof |
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Application publication date: 20140820 |