5.0mm tykkelse 5052-H32 aluminium plate/coil produksjonsprosess

5052-H32 aluminum plate/coil Production process

Produksjonsprosessen av 5052 aluminum alloy is: melting and casting → ingot sawing and milling → billet heating → hot rolling → cold rolling → finished product annealing → cross cutting → packaging.

5052-H32 aluminiumslegering

Ingot preparation

On-line double rotor degassing, then use Al5TiB in the chute to refine the grain, and finally filter through the ceramic filter plate, enter the crystallizer and cast into a flat ingot of 630mm×1400mm×8000mm.

Ingot sawing and heating

The ingot is cut off by a sawing machine, and then enters the milling machine for peeling, removing the surface segregation layer and oxide scale, and then transfers to the heating furnace for heating. Heating process system: 480 ° C for 3 timer, after the heat preservation is completed, it is taken out of the furnace and rolled.

Varmvalset

The high-temperature ingot undergoes 19 passes of hot rough rolling to become an intermediate billet. After cutting the material head, it enters the 4-stand hot finish rolling mill. After continuous rolling and thinning, high-temperature coiling begins to control the hot-rolled coil The thickness is 6.7mm, the final rolling temperature is 325°C±5°C, and the coil is naturally cooled after it is off the machine.

Cold rolling hardening

The cooled hot-rolled coils are rolled out of the finished products one by one on the cold rolling mill, and the total processing rate of cold rolling is 25%. I tillegg, the cold rolling mill must control the angle and air pressure of the edge purge to prevent oil and splash on the surface of the coil, so as to reduce the risk of oil spot defects.

Finished annealing

For direct annealing without cleaning, it is first necessary to ensure that there are no oil spots on the surface of the coil, and it is also necessary to ensure that the residual oil can be completely volatilized, and the process window is very narrow. If the temperature is too low, there will be no oil spots, but there will be residual oil; if the temperature is too high, there will be no residual oil, but there will be oil spots.
The special annealing process system adopted:
In the first stage, the furnace gas is set to 180°C, the heating rate is set to 35°C/h, and the negative pressure and purging are turned on to play the role of pre-drying in the air environment;

In the second stage, when the furnace gas reaches 180°C, start filling N2 gas to control the oxygen content in the furnace below 0.1%, and then keep it warm for 6 hours to play the role of pre-drying in an oxygen-free environment. Will cause oil spots due to oxidation;

In the third stage, the furnace gas is changed to 235°C, and the heating rate is set to 30°C/h. When the temperature of the coil reaches 230°C, it is kept for 3 timer, and the quenching and tempering of the coil is completed, and the expected mechanical properties are achieved. På denne tiden, the residual oil is also volatilized, but it has not entered the dangerous temperature range of oil spots (245 ° C ~ 400 °C);

In the fourth stage, the furnace gas is set to 0°C, and the side cooling fan is started to quickly cool down. When the metal temperature drops below 150°C, it is out of the furnace and exposed to air.

5052 kjemisk sammensetning av aluminiumslegering

Chemical Composition Analysis

1) Og in the alloy is an impurity element. During casting and solidification, it can form complex ternary compounds with Fe and Al. The primary phase has a large size and is distributed on the dendrite boundary. It is an insoluble phase during the melting process, which is harmful to the plasticity of the alloy . Strict control of w(Og)≤0.10% in the test can reduce the overall amount of AlFeSi complex ternary compounds, thereby improving the plasticity of the alloy.

2) Fe in the alloy is not all impurity elements, and its mass fraction is controlled at 0.2% til 0.3%, som kan unngå skadelige effekter og spille sin fordelaktige rolle. En del av Fe-elementet i legeringen eksisterer i en overmettet form. Under homogeniseringsprosessen ved høy temperatur, den AlFeSi-dispergerte fasen kan utfelles inne i kornet, og størrelsen er veldig liten, som kan foredle det omkrystalliserte kornet og bidra til styrken og plastisiteten.

Pakket 5052-H32 aluminiumsplate

3) I legeringen, w(Fe)/w(Og)>2.0 er kontrollert, og α-fasen (AlFeSi) og en liten mengde β-fase (AlFeSi) dannes hovedsakelig under størkning, og morfologien til a-fasen er benlignende. Den kan bli fullstendig ødelagt under valseprosessen og er ufarlig for plastisitet. β-fasen (AlFeSi) er en nållignende hard og sprø fase, which is difficult to break during hot rolling and is harmful to plasticity.

4) Cu in the alloy is an impurity element, which has an impact on the corrosion resistance of the alloy. The w(Cu) is controlled to be no more than 0.05%.

5) Mn in the alloy is an impurity element. Til 5052 aluminiumslegering, Cr is used to refine the recrystallized grains, not Mn, so w(Mn) should be controlled within 0.08%.

6) Mg in the alloy is an alloying element, and Mg is dissolved in the aluminum matrix, which can hinder the movement of dislocations and play a role in work hardening. Controlling w(Mg) at 2.5% til 2.7% can ensure a faster work hardening effect, and sufficient tensile strength can be guaranteed without a large cold working rate.

7) Cr in the alloy is an alloying element. It exists in a supersaturated form when the ingot is solidified, and it precipitates during the subsequent heating process to form a dispersed phase CrAl7. The particles have good thermal stability and can refine the recrystallized grains. Det kan forbedre styrken og plastisiteten til legeringen. Kontroll m(Cr) at 0.18% til 0.24%. Hvis krominnholdet er for høyt, vil det dannes en skadelig grovfase; hvis krominnholdet er for lavt, den dispergerte fasen vil være utilstrekkelig og den gunstige effekten vil bli svekket.

8) Av i legeringen kan danne TiAl3 og AlTi5B1, som kan foredle kornene til barren, og derved forbedre de mekaniske egenskapene til barren.

Finished 5052-H32 analysis

1) Spolen produsert av den nye prosessen har god overflatekvalitet, ingen oljeflekker og oljerester, og oppfyller kravene i standarden. Intern strukturobservasjon: krystallkornene er fine og jevne, uten fibrøs struktur. Anisotropien til denne organisatoriske staten er liten, og det er ikke lett å sprekke når det bøyes. Imidlertid, de konvensjonelle varmvalsede lavtemperatur direkte off-line produktene er fibrøse strukturer med stor anisotropi, og platene er tilbøyelige til å sprekke når de bøyes på tvers.

2) De mekaniske egenskapene og bøyetestresultatene til den 5,0 mm tykke 5052-H32 aluminiumslegeringsplaten produsert av den nye prosessen er vist i tabell 4. Platene ble sendt til sluttbrukerne for prøvebruk. Resultatene var gode, og 90°0t bøyningen sprakk ikke. De nye håndverksproduktene nådde de forhåndsbestemte målkravene.

2mm tykkelse 5052-H32 aluminiumsplate

The core process in the production of 5052-h32

• 1) 5052-H32 aluminiumslegering nasjonal standard middels tykk plate produsert ved konvensjonell varmvalsing direkte lavtemperatur off-line prosess har alvorlig fibrøs struktur og er utsatt for sprekker i tverrgående bøying.
• 2) Den nyutviklede 1+4 varmt kontinuerlig valseverk brukes til blanking, og den endelige rulletemperaturen er nøyaktig kontrollert ved 325°C±5°C, som kan oppnå en fullstendig rekrystalliseringstilstand, som er den samme som produksjonseffekten av kaldvalsing-mellomgløding.
• 3) Den kaldvalsede ferdigplaten er direkte glødet uten rengjøring, og den spesielle ferdigglødingsprosessen kan sikre at det ikke er noen oljeflekker og gjenværende olje på overflaten, og bøyeytelsen er utmerket.