CN102796926A

CN102796926A - High-strength aluminum alloy round pipe and manufacturing method thereof

Info

Publication number: CN102796926A
Application number: CN2012103133843A
Authority: CN
Inventors: 鄭博文
Original assignee: MINGDA ALUMINUM TECHNOLOGY (TAICANG) Co Ltd
Current assignee: MINGDA ALUMINUM TECHNOLOGY (TAICANG) Co Ltd
Priority date: 2012-08-30
Filing date: 2012-08-30
Publication date: 2012-11-28

Abstract

The invention discloses a high-strength aluminum alloy round pipe. The high-strength aluminum alloy round pipe comprises the following components in percentage by mass: 0.58+/-0.03 percent of silicon, less than 0.17 percent of iron, 0.23+/-0.03 percent of copper, less than 0.1 percent of manganese, 0.86+/-0.03 percent of magnesium, 0.07+/-0.03 percent of chromium, less than 0.03 percent of zinc, less than 0.03 percent of titanium, less than 0.15 percent of boron and the balance of aluminum. The manufacturing method comprises the following steps of: mixing and smelting head and tail waste material aluminum in the extrusion process and pure aluminum, wherein the amount of the head and tail waste material aluminum is 10 to 30 percent of total mass of materials; adding alloy components in the smelting process; refining, removing impurities, removing slag and standing; casting at the temperature of 730+/-5 DEG C to manufacture aluminum ingot; and performing extrusion forming. he high-strength aluminum alloy round pipe has the advantages that: the head and tail waste material aluminum in the smelting process and the original aluminum are mixed and smelted, and the head and tail waste material aluminum in the smelting process does not comprise coating and various impurities purchased from the market, so introduction of the impurities is controlled from the raw materials; production cost is reduced; by the manufacturing process, the tensile strength of the product reaches at least 300 MPa and the yield strength of the product reaches at least 270 MPa; and compared with the tensile strength of 260 MPa and the yield strength of 240 MPa of the common round pipes, the strength is enhanced by about 15 percent, so the mechanical property of the product is obviously improved.

Description

A kind of aldural pipe and method of manufacture thereof

Technical field

The present invention relates to a kind of aluminium-alloy pipe and method of manufacture thereof, particularly a kind of aldural pipe and method of manufacture thereof.

Background technology

Extrusion molding is adopted in the processing of tube and pipe of aluminium alloy now more; But owing to there is the too much reason of input industrial waste alumina in the use aspect of raw material; Various defectives appear in the product surface after causing pushing in doing the process of anodizing, simultaneously because fusion process can't be removed impurities in raw materials, though through the HTHP moulding; But its intensity is had a greatly reduced quality, and has a strong impact on the product mechanical property.

Summary of the invention

Goal of the invention: the objective of the invention is deficiency, a kind of aldural pipe and method of manufacture thereof are provided, improve product strength to prior art.

Technical scheme: a kind of aldural pipe, its component and quality percentage composition are: silicon 0.58% ± 0.03%, iron less than 0.17%, copper 0.23% ± 0.03%, manganese less than 0.1%, magnesium 0.86% ± 0.03%, chromium 0.07% ± 0.03%, zinc less than 0.03%, titanium less than 0.03%, boron less than 0.15%, all the other are aluminium.

The method of manufacture of above-mentioned a kind of aldural pipe; The key step of this method is: the aluminium of waste material end to end and the fine aluminium mixed smelting that will account for the extrusion process of the quality 10%～30% that always feeds intake; Add aluminum silicon alloy, iron, copper, manganese, chromium, magnesium, zinc, aluminium titanium boron wire in the fusion process; Be cast as aluminium ingot, extrusion molding again through refining, after doing odds and ends, remove the gred, leaving standstill in 730 ± 5 ℃.

Casting aluminium bar control grain fineness number is not more than 1 grade.

The quality percentage composition of iron is less than 0.13% in the said fine aluminium.

480 ± 10 ℃ of die temperatures, 480 ± 10 ℃ of aluminum ingot temperatures, 530 ± 10 ℃ of temperature outs.

Beneficial effect: compared with prior art; Advantage of the present invention is with the aluminium of waste material end to end of extrusion process and primary aluminum mixed smelting, and there are not all kinds of material that are mingled with of spray material and market purchase in the aluminium of waste material end to end of extrusion process, brings into from raw material control impurity; Reduced production cost simultaneously; Through ME, make minimum 270 MPa that reach of the minimum 300MPa of reaching of tensile strength, ys of product, again than the tensile strength of general pipe 260MPa and the ys of 240MPa; Strength enhancing is about 15%, has significantly improved mechanical performance of products.

Embodiment

Below in conjunction with specific embodiment; Further illustrate the present invention; Should understand these embodiment only be used to the present invention is described and be not used in the restriction scope of the present invention; After having read the present invention, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the present invention.

A kind of aldural pipe, its component and quality percentage composition are: silicon 0.58% ± 0.03%, iron less than 0.17%, copper 0.23% ± 0.03%, manganese less than 0.1%, magnesium 0.86% ± 0.03%, chromium 0.07% ± 0.03%, zinc less than 0.03%, titanium less than 0.03%, boron less than 0.15%, all the other are aluminium.

The method of manufacture of above-mentioned a kind of aldural pipe, the concrete steps of this method are:

(1) according to each constituent mass in the constituent mass percentage composition counting yield, calculate charging capacity, feeding intake is the aluminium of waste material end to end of extrusion process and the mixture of fine aluminium, the input amount of wherein controlling the aluminium of waste material end to end of extrusion process accounts for 10%～30% of total charging capacity;

(2) be dosed in the smelting furnace and add recombiner, prevent the aluminium ingot scaling loss;

(3) heating melting;

(4) add alloying constituent: aluminum silicon alloy, iron, copper, manganese, chromium, magnesium, zinc, aluminium titanium boron wire; Silicon in the aluminum silicon alloy with add silicon in the waste material to account for total weight percent be 0.58% ± 0.03%, all the other alloyed copper.

(5) stir: the continuation melting stirs;

(6) refining: add refining agent; Logical argon gas or nitrogen are removed the hydrogen that produces in the fusion process; Remove the impurity on aluminium liquid surface, carry out spectroscopic analysis, confirm whether each component concentration meets the requirements through sampling; As do not meet then and must add corresponding alloy again, till confirming that alloying constituent is qualified;

(7) discharge water: aluminium liquid is put into casting machine through chute, must sends into titanium alloy with crystal grain thinning at the chute oral area therebetween, and must carry out online degasification in the chute; Simultaneously the high pressure water in the casting die begins to cool down, and aluminium bar is along with the elevator moulding that descends;

(8) aluminium bar is hung out from underground, casting length is generally about 6.5m;

(9) with concentrating on aluminium bar bad section removal end to end in the castingprocesses;

(10) aluminium bar heating: the different extrusion temperature of the various manufacturing state different set of foundation: F material-state of nature, 450～480 ℃ of extrusion temperatures; T1 material-high temperature high wind the state of cooling, 460～510 ℃ of extrusion temperatures; T4 material-solution treatment state, 470～490 ℃ of extrusion temperatures;

(11) extruding: the extrusion speed condition according to various products are different is separately produced on the board of examining, 530 ± 10 ℃ of control extrusion speed 2.0～6.0mm/s, temperature outs;

(12) work in-process sawing: remove the bad part that product exists in the extrusion process;

(13) packing.

Claims

1. aldural pipe is characterized in that its component and quality percentage composition are: silicon 0.58% ± 0.03%, iron less than 0.17%, copper 0.23% ± 0.03%, manganese less than 0.1%, magnesium 0.86% ± 0.03%, chromium 0.07% ± 0.03%, zinc less than 0.03%, titanium less than 0.03%, boron less than 0.15%, all the other are aluminium.

2. the method for manufacture of a kind of aldural pipe according to claim 1; The key step that it is characterized in that this method is: the aluminium of waste material end to end and the fine aluminium mixed smelting that will account for the extrusion process of the quality 10%～30% that always feeds intake; Add aluminum silicon alloy, iron, copper, manganese, chromium, magnesium, zinc, aluminium titanium boron wire in the fusion process; Be cast as aluminium ingot, extrusion molding again through refining, after doing odds and ends, remove the gred, leaving standstill in 730 ± 5 ℃.

3. the method for manufacture of a kind of aldural pipe according to claim 2 is characterized in that: casting aluminium bar control grain fineness number is not more than 1 grade.

4. the method for manufacture of a kind of aldural pipe according to claim 2 is characterized in that: the quality percentage composition of iron is less than 0.13% in the said fine aluminium.

5. the method for manufacture of a kind of aldural pipe according to claim 2 is characterized in that: extruding condition is: 480 ± 10 ℃ of die temperatures, 480 ± 10 ℃ of aluminum ingot temperatures, 530 ± 10 ℃ of temperature outs.