CN101914711A - Aluminum alloy for making traffic signs - Google Patents

Abstract

The invention discloses an aluminum alloy for traffic signs. The aluminum alloy comprises the following components in percentage by weight: 0.4 to 0.8 percent of copper (Cu), 0.2 to 3 percent of chromium (Cr), 0.1 to 0.3 percent of magnesium (Mg), 0.05 to 1.5 percent of manganese (Mn), 0.01 to 0.15 percent of carbon (C), 0.01 to 0.5 percent of titanium (Ti) and the balance of aluminum and inevitable impurities.

Description

A kind of aluminium alloy that is used to make traffic mark board

Technical field

The present invention relates to traffic mark board aluminium alloy and preparation method thereof based on the Al-Mg-Cu-Ti alloy system.The invention still further relates to the traffic mark board that utilizes this aluminium alloy to make.

Background technology

In recent years, along with the continuous development of China's transport development, earth-shaking variation has taken place in the motorway mileage, and the safety effect of freeway traffic facility performance is more and more important, and the freeway traffic sign is unusual the key link in the traffic facilities.Though China's motorway development rapidly, related industries is but stagnated, and for example, needed a large amount of road and traffic sign plates but lack progressive and improvement on motorway.The making of sign board generally will be considered factors such as the intensity, rigidity, stability under the extraneous loading action, therefore should be rigid in checking up in the selection of sign board starting material and web member.The aluminium that generally adopts is corrosion-resisting aluminiums such as pure aluminum plate or 5A02 in the market, though this corrosion-resisting aluminium has reached requirement on anticorrosive, but usually cause the degeneration in advance of traffic mark board owing to insufficient strength, especially in area coastal and that wind-force is bigger, and this corrosion-resisting aluminium needs the complicated heat treatment process in manufacturing processed, therefore, be badly in need of now wanting a kind of traffic mark board base plate that can also proof strength when having antiseptic property to occur, this base plate also must satisfy requirement cheaply.A kind of traffic sign base plate of being made by steel plate has also appearred now, this base plate main body is general use soft steel and/or ultra low-carbon steel layer, the surface is the pure zinc coating of antiseptic heat, base plate thickness is between 0.8-1.2mm, though the traffic sign base plate that should be made by steel plate has advantage cheaply, it is ductile poor, the shortcoming that processing characteristics is bad, it also needs special zinc-plated rotproofing simultaneously, and therefore, range of application is narrow.

Detailed Description Of The Invention

The object of the present invention is to provide a kind of traffic mark board aluminium alloy with low cost, and the traffic mark board that uses this aluminium alloy to make, it is guaranteeing that the erosion-resisting while can reach high strength, and do not need complicated heat treatment can obtain desired properties, it has adopted, and carbon is rotten to be handled, and is keeping having guaranteed desired properties under the prerequisite cheaply.

The Al-Mg-Cu-Ti alloy system aluminium alloy that a kind of C is rotten, it consists of the aluminium and the unavoidable impurities of (wt%) Cu:0.4-0.8, Cr:0.2-3%, Mg:0.1-0.3, Mn:0.05-1.5, C:0.01-0.15%, Ti:0.01-0.5, surplus, has tensile strength 〉=315MPa, the performance of unit elongation 〉=3%.

It has low cost, is easy to advantages such as processing.

A kind of preparation method who makes with the rotten Al-Mg-Cu-Ti alloy system aluminium alloy of C is characterized in that: comprise the steps

1) in above-mentioned element ratio scope, selects a group element ratio, again the alloy total amount of preparing as required, extrapolate the quality of every kind of required elemental metals, perhaps the quality of master alloy, the perhaps quality of mixed additive, work out the alloy production allocation sheet, and get the raw materials ready by batching choosing foot;

2) add an amount of aluminium ingot or molten aluminum liquid in smelting furnace, heating makes it to melt fully and is incubated down at 700-800 ℃;

3) press formula rate again and add Mn, Ti pure metal or Al-Mn, Al-Ti master alloy or hybrid metal additive earlier, add Cu or Al-Cu master alloy after stirring again, add C again, stir;

4) then above-mentioned alloy melt is carried out furnace refining; Add refining agent in alloy melt, and stir, the melt refining is operated in enclosed environment;

5) slag hitting after the refining, leave standstill, temperature adjustment is to 630-850 ℃, alloy liquid is toppled over and is come out of the stove, online degasification, slagging-off are handled;

6) casting;

7) foundry goods is carried out 430-570 ℃, 20 hours with interior solution treatment.

The sample index, tensile strength 〉=315MPa, unit elongation 〉=3%.

Then this aluminium alloy is carried out the strip processing and fabricating, in the casting machine downstream, be right after 3 hot continuous mills, tandem rolling is to the sheet material of desired thickness.

Embodiment

Embodiment 1

A kind of aluminium alloy, it consists of the aluminium and the unavoidable impurities of (wt%) Cu:0.4, Cr:1.2%, Mg:0.25, Mn:1.1, C:0.06%, Ti:0.3, surplus, according to becoming component selections choosing foot batching;

2) add an amount of aluminium ingot or molten aluminum liquid in smelting furnace, heating makes it to melt fully and is incubated down at 719 ℃;

3) press formula rate again and add Mn, Ti pure metal or Al-Mn, Al-Ti master alloy or hybrid metal additive earlier, add Cu or Al-Cu master alloy after stirring again, add C again, stir;

4) then above-mentioned alloy melt is carried out furnace refining; Add refining agent in alloy melt, and stir, the melt refining is operated in enclosed environment;

5) slag hitting after the refining, leave standstill, temperature adjustment to 7.2 ℃, alloy liquid is toppled over and is come out of the stove, online degasification, slagging-off are handled;

6) casting;

7) foundry goods is carried out 190 ℃, 16 hours solution treatment.

The sample index, tensile strength 406MPa, unit elongation 3.2%

Then this aluminium alloy is carried out the strip processing and fabricating, in the casting machine downstream, be right after 3 hot continuous mills, tandem rolling is to the sheet material of desired thickness.

Embodiment 2

A kind of Al-Mg-Cu-Ti line aluminium alloy, it consists of the aluminium and the unavoidable impurities of (wt%) Cu:0.8, Cr:3%, Mg:0.05, Mn:1.4, C:0.09%, Ti:0.45, surplus, according to becoming component selections choosing foot batching;

2) add an amount of aluminium ingot or molten aluminum liquid in smelting furnace, heating makes it to melt fully and is incubated down at 780 ℃;

3) press formula rate again and add Mn, Ti pure metal or Al-Mn, Al-Ti master alloy or hybrid metal additive earlier, add Cu or Al-Cu master alloy after stirring again, add C again, stir;

4) then above-mentioned alloy melt is carried out furnace refining; Add refining agent in alloy melt, and stir, the melt refining is operated in enclosed environment;

5) slag hitting after the refining, leave standstill, temperature adjustment to 830 ℃, alloy liquid is toppled over and is come out of the stove, online degasification, slagging-off are handled;

6) casting;

7) foundry goods is carried out 469 ℃, 17 hours solution treatment.

The sample index, tensile strength 376MPa, unit elongation 3.8%

Then this aluminium alloy is carried out the strip processing and fabricating, in the casting machine downstream, be right after 3 hot continuous mills, tandem rolling is to the sheet material of desired thickness.

Embodiment 3

A kind of Al-Mg-Cu-Ti line aluminium alloy, it consists of the aluminium and the unavoidable impurities of (wt%) Cu:0.4, Cr:2.9%, Mg:0.29, Mn:0.1, C:0.15%, Ti:0.02, surplus, according to becoming component selections choosing foot batching;

Use method similar to Example 1 to produce this aluminium alloy,

Gained sample index, tensile strength 330MPa, unit elongation 4.1%.

Claims (5)

1. traffic mark board aluminium alloy, it consists of the aluminium and the unavoidable impurities of (wt%) Cu:0.4-0.8, Cr:0.2-3%, Mg:0.1-0.3, Mn:0.05-1.5, C:0.01-0.15%, Ti:0.01-0.5, surplus.

2. aluminium alloy as claimed in claim 1, its performance are tensile strength 〉=315MPa, unit elongation 〉=3%.

3. as each described aluminium alloy of claim 1-2, it is characterized in that it has low cost, is easy to advantages such as processing.

4. a manufacturing is characterized in that: comprise the steps with the preparation method of the rotten Al-Mg-Cu-Ti alloy system aluminium alloy of C

1) in each described proportional range of claim 1-2, select a group element ratio, again as required the preparation the alloy total amount, extrapolate the quality of every kind of required elemental metals, the perhaps quality of master alloy, perhaps the quality of mixed additive is worked out the alloy production allocation sheet, and gets the raw materials ready by batching choosing foot;

2) add an amount of aluminium ingot or molten aluminum liquid in smelting furnace, heating makes it to melt fully and is incubated down at 700-800 ℃;

3) press formula rate again and add Mn, Ti pure metal or Al-Mn, Al-Ti master alloy or hybrid metal additive earlier, add Cu or Al-Cu master alloy after stirring again, add C again, stir;

4) then above-mentioned alloy melt is carried out furnace refining; Add refining agent in alloy melt, and stir, the melt refining is operated in enclosed environment;

5) slag hitting after the refining, leave standstill, temperature adjustment is to 630-850 ℃, alloy liquid is toppled over and is come out of the stove, online degasification, slagging-off are handled;

6) casting;

7) foundry goods is carried out 430-570 ℃, 20 hours with interior solution treatment.

5. traffic mark board of making by each described aluminium alloy of claim 1-3.